How to get rid of runout on a drill press

Making a drill press out of an electric motor

Self-made with improvised materials are very popular in recent years. Everybody wants to do something useful from what is lying idle. For this self-made machine we need a bit of junk that every garage or shed must have. What do we need for the construction of a drilling machine with their own hands??

We also need a regular drill and a welding machine. Let’s gather all necessary tools and materials into a pile and begin making our self-made drilling machine. As a result, we should have a machine, which is very similar to the factory one, but several times cheaper. We have developed for you a simple step by step guide on how to make such a machine.

runout, drill, press

Make the table top. To make the table top for the machine, we need a sheet of metal with the dimensions 30 cm by 70 cm. We make the base of the table from profile pipe 25 x 35 mm. Expose them to the size of the future table top and weld them together. On top of the previously prepared sheet metal is attached and permanently welded to the table frame.

Making the machine stand. Then we proceed to making the main stand of the homemade drilling machine. To make it we need two 25 mm angles. We weld them together to make a square (50 mm). It is desirable not to weld a continuous seam, as metal can distort, and use of such a rack will be difficult (possible further wedging of the driving part of the mechanism). It will be enough to make 7. 8 welding points on each side of the stand. Grind them flush, so they do not protrude beyond the corners of the structure. We weld the rack to the tabletop at right angles.

making the lifting mechanism. The main condition for making a drilling machine with your own hands is translational movement up and down. That’s what makes it possible to drill through different materials. To make such a mechanism yourself, we need a piece of square metal profile with a wall length of 60 mm. Cut off a piece of about 30 cm. Place this profile on the stand. It should fit tightly on the stand, but there will still be a little play (we’ll fix it later). Check that the profile does not touch the welding points of the stand, and that it goes up and down on the stand without hindrance.

Eliminate backlash on the stand. To make the moving part move as clearly as possible on the stand of the home drilling machine, we need to make the spacer bar with rolling bearings. Weld a bolt to the moving part of the mechanism at the corner of the profile tube. We take a 25 angle (50 cm long), drill a hole with the same diameter as the bolt. Before that, it is necessary to mount the bearings on the angle as shown in the photo. Assemble the construction using a powerful spring. This design will help remove the backlash, thereby improving the slip of the moving mechanism.

motor mount. To properly secure the motor of the homemade drilling machine, we need to make another platform. We take the same 60 profile, cut off a 30 cm piece and weld it to the sliding part on the prop. Before that, on the top and bottom of the profile, it is necessary to cut two holes for the cable with an angle grinder. It is also necessary to make a handle with an axis, on which a rope will be twisted. Drill two holes in the profile. We make the handle axis from a metal bar with a cross section of 15 mm. Fix it at the base with circlips and on one end of the rod we weld the handle (shown in the photo).

lifting mechanism. To adjust the height of lifting and lowering of the drilling structure, we need a mechanism that will move it all. We will not complicate the task, and unbend the flywheel crown or something else, we will make an ordinary cable mechanism. To do this, we need an ordinary cable from a bicycle brake mechanism, or any other cable with a small cross section.

At the bottom of the table drill stand we make a through hole. To make the cable fastening we need a bolt and three nuts. Screw two nuts on the bolt, put it in the hole, and screw one more nut. Fix the wire between the first two nuts and tighten them with two open-end wrenches. After that we fix the bolt on the stand itself.

Next, wind the rope on the axis of the lifter of the homemade drilling machine (it will be enough to do 3 turns).

Do the upper tensioner. To do this we’ll need a piece of metal with dimensions of 20 x 100 mm (not less than 4 mm) bent to get a semblance of tensioning claw (shown in the photo). Make a cut for the cable with the angle grinder. A bolt with a spring and nuts will be the tensioning element. Fixing the cable on the tabletop drill press the same way as underneath. We’ll put it through the spring, and screw a nut and a washer on top. Tighten the cable by tightening the nut on top. The cable tension is set once, but it is possible that in the future the cable will be stretched and will need to be tightened more.

At this point we have the whole frame ready, and it’s just a matter of putting the motor into it. The design we have got is not a big one. On the Internet there are many different options for the size of drilling machines with their own hands, but we chose the most optimal, and decided to recreate it. The medium-sized machine will fit perfectly in any garage and on any table, and will not take up much space, performing the same functions as the huge units. Not to be distracted by these details, and continue making the machine for drilling.

It is not possible to make many threaded holes to a given depth with an ordinary drill. Here we need the indispensable equipment, which is used in workshops and production shops, and it is the drilling machines. With these tools it is possible to cut discs from sheet steel, countersink, drill through and blind holes, make internal threads. How to choose and what types of drilling machines manufacturers offer.

“RULES OF LABOR PROTECTION ON ROAD TRANSPORT. POT R 0-200-01-95” (Approved by. Order of the Ministry of Transport of 13.12.95 N 106)

2.2.1. The work on the machines must be carried out in accordance with these rules and the regulations in force (clause. п. 45, 46, 47, 48 of Annex 1 to this Regulation).

2.2.2. Stationary and portable machines must be operated and maintained only by the persons to whom they are assigned.

Machines must be repaired by persons appointed by the order of the company.

2.2.3. Before turning the machine on, the worker must make sure that no one is in danger of starting it.

2.2.4. The employee is obliged to switch off the machine tool in case of

A workpiece is inserted or removed from the machine tool;

Repairing, adjusting, cleaning and lubricating the machine, removing sawdust and shavings.

2.2.5. Before stopping the machine, the worker must turn off the feed and remove the tool from the workpiece; 2.

2.2.6. Cutting tool or workpiece to be machined must be moved towards each other smoothly, without jerks.

2.2.7. When machining parts or workpieces weighing more than 15 kg (for women. over 10 kg) must be installed and removed using lifting devices or devices.

2.2.8. Machines must be equipped with safety devices (guards) to protect workers from flying chips and coolant (coolant).

2.2.9. If the technical conditions do not allow the use of a protective device on the machines, workers must work wearing safety glasses issued by the employer.

2.2.10. Stacking of materials and parts at the workplace must be carried out in a way that ensures their stability. The height of the stack of blanks, parts at the workplace must be chosen depending on the conditions of stability and ease of removal of parts from it, but not more than 1 m.

2.2.11. Always keep the operator’s workplace and premises clean, well lit and free of clutter with small parts and materials.

2.2.12. Chips must be removed from the machine with suitable devices (hooks, brushes).

Hooks must have smooth handles and face shields to prevent hands from being cut by shavings.

Chips must be removed from machines and work aisles daily, no chips are allowed to accumulate. Chips are collected in special boxes, and as they are filled they are removed from the shop (section).

2.2.13. All equipment in operation must be under constant supervision of the production area supervisor.

2.2.14. Employees and site managers must ensure that there are no unauthorized persons near the machines.

2.2.15. Work clothing must be buttoned up tightly during work. Hair must be covered with a headdress (beret, headscarf, net, etc.).п.) and matched to it.

2.2.16. When leaving the workplace, even for a moment, the operator must switch off the machine.

2.2.17. A sign “Do not turn on machine” must be posted on a defective machine by the site supervisor. defective”. Such a machine must be disconnected from the power supply.

2.2.18. On the lathe, deburring and polishing of workpieces with an emery cloth should be carried out with the help of special devices (clamps, holders).

2.2.19. The ends of the workpieces extending over the lathe spindle must be enclosed in a fixed guard (a guard with a plastic cover).

2.2.20. Machining of metals that form drain chips should be carried out using chip breakers to crush the chips. Brittle metals and dust generating materials must be machined with local suction.

2.2.21. When removing (unscrewing) the chuck or faceplate, rotate them only by hand. Do not turn on the machine spindle for this purpose.

2.2.22. When installing drills and other cutting tools and appliances in the machine tool spindle, special attention must be paid to the strength of their mounting and accuracy of installation.

2.2.23. Chips must not be removed from the hole being drilled until the machine has stopped and the tool has been retracted.

2.2.24. All objects to be machined must be securely mounted and secured on the table or plate of the drilling machine using vices, jigs or other fixtures.

2.2.25. To extract the tool from the spindle of the drilling machine hammers and punches made of a material that prevents separation of its particles on impact should be used.

2.2.26. When installing and changing milling cutters on the milling machine, devices must be used to prevent cuts to the hands.

2.2.27. Remove chips from the rotating cutter with a wooden stick or brush with a handle at least 250 mm long; 2.

2.2.28. The distance for free passage between the wall and the table or slider of the planing machine in the outermost position at their maximum output must not be less than 700 mm.

2.2.29. It is prohibited to work on machines:

stand against the cutter, correct parts and pads while the planer is running;

Remove any guards from the machine or keep them open during operation;

work on defective machines, as well as on machines with defective or poorly secured guards;

Pressing the sanding and polishing cloths against the workpiece by hand;

place tools and parts on the machines, leave the key in the chuck of the machine;

to use drills and chucks with clogged or worn shank;

Use gloves when working on the drilling machine;

Hold the workpiece by hand during machining;

Use cutters with cracked or broken teeth;

To allow other persons to operate the sharpening machines and to work on them;

to touch rotating parts with their hands, to put their hands into the area of their movement, to use wet rags for cooling, to lean on the machine;

blowing metal dust and shavings off machines and workpieces by compressed air.

2.2.30. Storage and transportation of abrasive tools, their inspection, installation on grinding and sharpening machines, as well as their operation must comply with the requirements of current legislation (Para. п. 49, 50 of Appendix 1 to this Regulation).

2.2.31. Only specially trained personnel are allowed to install abrasive wheels on the machine.

2.2.32. Before installation, the abrasive wheels must be balanced. If an imbalance is detected after the first dressing or during work, the wheel must be rebalanced. Cutting and roughing-off wheels may not be balanced before they are installed on the machine.

2.2.33. When mounting the abrasive wheel, it is necessary to install spacers of cardboard or other elastic material between the flanges and the wheel with a thickness of 0.5. 1 mm. The gaskets must protrude beyond the flange around the entire circumference by 1. 5 mm.

2.2.34. Before commencing work, the wheel mounted on the grinding machine must be checked for free running (idle) at the operating speed: a wheel with a diameter of up to 400 mm, 5 mm. at least 2 min, over 400 mm. at least 5 min.

2.2.35. Work may only be commenced after it has been ensured that the grinding wheel is free from runout and that the runout of the grinding machine spindle does not exceed 0.03 mm.

The protective screen must be interlocked with the starting device to ensure that the machine cannot be started if the screen is raised (withdrawn).

2.2.36. Testing, installation and dressing of abrasive wheels is performed by specially trained and appointed by the order of the enterprise workers.

2.2.37. When working on machines with abrasive wheels it is forbidden:

install a wheel without a mark of its testing;

to make dressing of grinding wheels with non-special tools;

Use levers to increase the pressure on the wheel;

to use for cooling liquids that are harmful to the health of workers or the mechanical strength of the wheel;

to work with the side (face) surfaces of wheels not specially designed for this type of work;

Work on a machine that has two wheels on the same spindle if the diameter size of one wheel differs from the other by more than 10%;

2.2.38. If the diameter of the wheel decreases due to wheel actuation, the number of revolutions of the wheel may be increased, but so that the peripheral speed allowed for the wheel in question is not exceeded.

2.2.39. Facilities that use abrasive tools must be instructed to:

on installation and operation of abrasive tools;

2.2.40. To support workpieces fed manually to the grinding (sharpening) wheel, the undercarriage or a device replacing it must be used. Handrails must be movable, allowing them to be set in the desired position as the lap is actuated.

2.2.41. The gap between the edge of the undercarriage and the working surface of the wheel should be less than half the thickness of the workpiece, but not more than 3 mm, and the edge of the undercarriage on the side of the wheel should not have potholes, chips and other defects.

2.2.42. Hand grips are set so that the part touches the circle above the horizontal plane passing through the center of the circle, but not more than 10 mm.

2.2.43. After each repositioning, the underrupter must be securely fastened in position.

Do not relocate the support device until the grinding wheel has stopped turning.

2.2.44. Abrasive wheels must be enclosed by protective covers during operation. The housing is made of cast steel or steel sheet.

2.2.45. Circles with a diameter of 30 mm or more, except for circles, type PN, PR, K and M. as well as all circles with a diameter of 150 mm or more must be tested in accordance with the current regulations before being installed on the machine (p. 49 of Annex 1 to this Regulation).

PN. flat built-up; PR. flat corrugated; K. circles. rings; M. for cutting minerals.

2.2.46. Grinding wheels that have undergone any mechanical alteration, chemical treatment, are not marked, or whose warranty has expired, must be tested for mechanical strength immediately prior to installation on the grinding machine.

2.2.47. Each machine must display in a prominent place a table with the allowable working circumferential speed of the abrasive wheel used and the number of revolutions per minute of the machine spindle and a table with the name of the person responsible for its operation.

2.2.48. When working on band and circular saws, when processing small objects, special feeding and holding devices must be used to eliminate the possibility of damaging the fingers of the worker.

2.2.49. Cleaning and cleaning of the saw and the adjoining saw floor is only permitted after the saw has come to a standstill.

2.2.50. Special pushers must be used on planing machines when working on materials shorter than 400 mm, narrower than 50 mm or thinner than 30 mm or when finishing sawing; both hands must be on the pusher when using the pushers.

2.2.51. For sawing work with a length of more than 1500 mm it is forbidden to use roller supports near the machine; work with material longer than 1500 mm without roller supports.

2.2.52. you can only start working on the machine when the shaft with the cutting tool has its full rotational speed.

2.2.53. If the cutting tool of the machine comes to an unintentional standstill with a workpiece underneath the guard, switch off the machine and only after that raise the guard and eliminate the malfunction.

2.2.54. When working on woodworking machines it is forbidden:

stop the machine by pushing a piece of material against the disk;

work on circular saws with cracks, broken teeth or loose plates;

Tool setting and changing

Install tools when the machine is at a complete standstill and beware of cutting edges that could cut your hands. Make sure it is securely and firmly fastened and centered. Tool change without stopping the machine is only possible with a special quick-change chuck.

Firmly and firmly fasten cutting and auxiliary tools. Make sure that the tool and mandrel shanks are carefully aligned with the taper of the spindle. Inspect and wipe the seating surfaces before installing the tool. Do not allow chips on these surfaces.

When inserting the tool into the drill chuck, the tip of the drill shank must press against the bottom of the socket.

When threading with taps, especially in blind holes, you need to fix the tool in a safety chuck.


At the moment I’m doing a lot of household chores around the house. There is a lot of drilling involved. Operating a drill with one drill is more than awkward because the drills must be changed all the time. That’s why I always had two power drills and a rotary head for delicate reaming holes to large diameters at work. And so I decided to add a hand drill to this arsenal for countersinking holes, even though it is old, but it works. Only the chuck needs to be cleaned up. It rotates hard and has a fair bit of runout.

So, the chuck needs to be disassembled. I’ve looked what the virtual space of internet offers in such cases, it is all very illustrative but a little complicated, for example, it suggests to carry out the disassembling operation with the help of electric torator. And if you simply take the chuck in your hands and use the hammer and metal striker for disassembly?

Advantages of the machine

According to the data sheet, the Bosch PBD 40 machine belongs to the category of high-precision drilling equipment. That it fully complies with this category, testify and feedback from users. Features of the machine of this model is convenient operation, which is provided by the presence of an informative digital display, as well as ergonomically located controls.

Drilling blind holes for furniture hinges on the machine

Here are some of the major benefits of the drill press under review that are mentioned in reviews of the model.

  • Machine tool is equipped with a reliable and high-precision drill chuck, design of which allows for quick change of cutting tools without the use of locksmith’s tools. Another notable characteristic of this chuck is that it is equipped with a mechanism for automatic tightening of tool mount (occurs at the moment when the working head rotation speed increases).
  • Convenience and ease of operation of vertical working head movement is connected with the use of special wheel-shaped hand wheel with rubber cover on the outer side of the machine.
  • The design of the machine has a reducer that provides two modes of equipment operation: in the first mode the maximum rotation speed of the cutting tool, and when the second mode is activated, the power of the equipment increases.
  • The built-in laser transmitter greatly simplifies working on the machine. The LED spotlight gives the machine operator a glimmer on the surface of the workpiece to see where the hole will be drilled.
  • Large worktable and parallel stop feature enable precise workpiece positioning when clamping the workpiece to the table.
  • Universal clamping device of quick-coupling design ensures reliable fixation of the workpieces of any shape on the surface of the worktable.
  • LED illuminators give good light quality in the machining area, allowing the machine to be used effectively even in poorly lit rooms.
  • Programmed speed stabilization system implemented in the design of this machine allows to effectively maintain the rotation speed of the cutting tool at a constant level.
  • Digital drilling depth indication is a useful option that allows the machine operator to drill several holes with the same parameters with high accuracy.

TYPO 29-001-086-02. Standard Labor Safety Instructions for Working with a CITOBORMA-type Drilling Machine (57613)

Only the persons having passed medical examination and having no contraindications for work in this profession (specialty), introductory briefing and briefing at the working place are allowed to work. Workers are admitted to work independently after an internship, theoretical knowledge testing and acquired skills on safe work methods. Subsequently occupational safety briefings shall be delivered at least once every 3 months at the work place.

When transferring to a new job, from temporary to permanent, from one operation to another with a change in the technological process or equipment, workers must be instructed on labor protection at the workplace.

All types of briefings shall be registered in the Briefing Book with the mandatory signatures of the person who received and performed the briefing.

Every employee shall comply with the requirements of these instructions, work and production discipline, work and rest schedule, all the requirements of safety at work, safe working practices, industrial hygiene, fire safety, electrical safety.

Smoking is permitted only in designated areas. It is forbidden to drink alcoholic beverages at work or to come to work while under the influence of alcohol or drugs.

You must be attentive at work, not be distracted by extraneous matters or conversations, and not distract others from your work. Do not sit or lean on any random objects or guards.

Do not come to operating machines, facilities, machines with other workers and distract them by extraneous conversations, turn on or off (except in case of emergency) equipment, transport and hoisting devices, work on which is not assigned, go behind fences of dangerous zones, to areas of technological passages.

The employer shall provide working employees with protective clothing, safety shoes and personal protective equipment in accordance with the work they are doing and in accordance with the regulations in force. Do not work without working clothes, safety shoes and other PPE laid down by regulations.

It is permitted to store and take food only in designated and equipped places.

It is forbidden to be in the production facilities in outer clothing, to undress or hang clothes, hats, bags on the equipment.

Do not block walkways, passages, workplaces, approaches to shields with fire-fighting equipment, fire hydrants and general switchboard.

Lubricants, washing agents, water, etc., spilled on the floor.п. wipe off immediately.

Wiping materials soaked in oil, paint, solvent shall be stored in tightly closed metal boxes. These materials must not be thrown around and must be removed at the end of the shift.

Combustible and flammable liquids should be stored only in a tightly closed metal container (box) or a cupboard in the amount not exceeding the changeable norm. Do not leave HL and HLW in passageways, passageways and working area of the equipment.

It is forbidden to repair equipment, repair electric equipment and power distribution network for unauthorized personnel, work around unfenced energized parts, touch electric wires, general lighting fixtures, open the doors of electrical cabinets, fences for switches, boards and control panels.

Do not use any lubricants or detergents for hand washing.

Stack finished products neatly, on racks no higher than 1.6 m from the floor (including the height of the rack).

Do not use racks (pallets) that are out of order: with defective coverings, broken legs, etc.д., leaning the racks (pallets) against the machine bed or wall, as well as placing them on the end face, carrying, stacking and dismantling the racks from the pile by one employee.

It is forbidden to use defective manual metalwork tools at work, as well as tools of improper sizes, to scatter them around the equipment, in aisles, passages (keep the tools and appliances in specially designated places).

Only perform work assigned by the supervisor. It is forbidden to entrust the equipment to another person and to let at the workplace persons having no relation to the entrusted work.

It is forbidden to stay in the production area after finishing work.

According to the current legislation, he/she is responsible for compliance with the instructions, accidents and incidents which occurred through his/her own fault.

It is the responsibility of the supervisor to supervise implementation of these instructions.

II. Safety requirements before starting work

Put on overalls and tidy up.

Read the notes in the equipment logbook. If there are any problems, do not start work until the problems have been fixed and the equipment is checked in the Operator’s or Electrician’s Logbook.

Inspect the equipment and the workplace. Prepare the necessary tools and appliances for work and check that they are in good working order.

Check idle mode of operation of the machine, checking the action of the switch-on, switch-off, braking devices, as well as whether the control lever is securely locked, and whether the work area is clean and tidy. Remove all superfluous objects (oil cans, rags, etc.) from the equipment.д.).

Check and adjust the lighting at the workstation.

Inform the supervisor immediately about noticed defects and irregularities at the working place and do not start working until these are fixed and the supervisor permits it.

III. Safety requirements during work

The CITOBORMA Table Top Drill must be placed on a level, horizontal, firm surface and be connected to a reliable power supply.

Keep the workplace and equipment clean and tidy. Cutting tools must be sharply sharpened and securely fastened on the machine, spare tools must be stored in their cases or cases.

Check the condition of the clamping device and the safety glass on the clamping device.

How to Measure Drill Press Runout

Check that the drill is set correctly, correct the run-out and securely fasten it in the chuck. Check that the spindle is held in the up position.

Set the machine table and stops into position and lock them securely.

Carry out all maintenance work on the machine: repairing, cleaning, lubricating, changing tools, removing guards, resetting formats, only after disconnecting the machine from the mains.

When turning the workpiece with the drill bit, stop the machine immediately if the tool jams or breaks.

Do not remove dust and waste paper until the machine has stopped.

IV. Safety requirements for emergency situations

In the event of fire, switch off the machine immediately and disconnect the electrical supply. except for the mains lighting. Report the fire to all those working in the room, call the fire department and proceed to extinguish the fire with the available fire extinguishing means.

If on metal parts of the equipment detected voltage (sense of current), grounding wire is broken, the equipment must immediately turn off, report to the master of the malfunction of electrical equipment and do not proceed to work without his instructions.

Disconnect the equipment from the network, stop the work and inform the administration of the workshop in case of defects of the equipment, safety and protective devices as well as in case of smell of burning and smoke, in case of penetration of foreign objects into the equipment, in case of power cut, in case of vibration and noise.

Upon injury, first release the injured from the injuring factor, call for medical advice, render first aid to the injured, inform the supervisor, and keep the hazardous situation under observation until the cause of the accident has been determined.

V. Safety requirements at the end of the job

Stop the equipment, turn off the main isolator, clean and tidy the work place, and make an entry in the logbook about the technical condition of the equipment.

Typical defects in machining, their causes and preventive measures

What do the different shapes and angles of sharpening the cutting part of the drill depend on??

What does the wear of core drilling tools depend on??

What does cutting speed when machining holes depend on??

What kind of equipment is used in drilling?

What safety regulations must be observed when drilling with a hand-held drill??

What is the sequence of drill sharpening??

What types of drills are used in locksmithing?

What kinds of defects can be encountered and how they can be eliminated during hole machining?

What safety rules must be observed when drilling with an electric drill??

What safety regulations must be observed when drilling workpieces?

Defect The reason How to prevent
Hole misalignment. Machine table is not perpendicular to the spindle. Chips underneath the lower surface of the workpiece. Incorrect (not parallel) shims. Workpiece is not seated properly on the machine table. Faulty or inaccurate fixtures. Check table is in the correct position. Clean off dirt and shavings from the table and workpiece during installation. Repair or replace shims. Check setting and anchoring of workpiece. Replace tool with one that is in good condition.
Bore misalignment. Drill bit run-out in spindle. Drill bit moving sideways. Improper setting or loose support of the workpiece on the table (workpiece moved during drilling). Incorrect alignment when drilling on gauge. Correct drill bit run out. Check that drill bit is properly sharpened, check for runout, and sharpen correctly. Check that the workpiece is set and fastened properly and securely clamped on the machine table. Correct workpiece alignment.
Excessive hole diameter. Spindle play on machine spindle. Incorrect grinding angles of drills or different lengths of cutting edges. Cross cutting edge misalignment. Correctly resharpen drill bit in all listed cases.
Rough machined hole wall surface. Excessive drill feed. Dull and incorrectly sharpened drill bit. Improper installation of the workpiece or drill bit. Insufficient cooling or incorrect coolant composition. Correctly sharpened drill bit. Check if the drill bit and the workpiece are properly clamped. Increase drill bit cooling or change coolant.
Increase hole depth. Incorrect depth stop setting. Set stop accurately to desired cutting depth.

Occupational health and safety requirements for the drilling machine

Wear overalls and carefully tuck hairs under the beret;

Check that the belt guard is in place and securely fastened and that the protective ground connection to the machine housing is in place;

place tools and workpieces in a certain prescribed order on a table or a special fixture, remove all unnecessary items;

securely fasten the drill bit in the chuck and the workpiece to be machined on the machine table in a vise and do not hold them by hand during machining;

Check that the machine is operating properly when idling;

Do not leave the key in the drill chuck after changing the cutting tool;

start up the machine when you are absolutely sure that it is safe to do so;

Monitor the operation of the pump and the amount of coolant flowing to the place of machining;

do not grasp the rotating cutting tool or spindle;

do not remove broken cutting tools from the hole by hand, use special devices for this purpose;

do not press hard on the feed lever when drilling workpieces during the working stroke (especially with drills of small diameter);

When changing a chuck or drill bit, place a wooden pad on the machine table under the spindle;

Use a special wrench or wedge to remove the drill chuck, drill bit or adapter bush from the spindle;

constantly watch for serviceability of cutting tools and devices for workpiece and tool fastening;

Do not pass or receive any objects over the operating machine;

Do not lean on the machine during operation;

Do not lubricate or cool the drill while the machine is running with wet rags;

Do not leave the operating machine unattended;

Safety requirements for working with an electric hand drill

Before starting work, check that the electrical cord and plug are in good condition;

before starting drilling check that the drill is idle and that there is no runout of the drill bit. If necessary, the drill bit should either be replaced or re-fitted;

when drilling holes in workpieces made of high-strength steels, use coolant;

stop rotation of the electric drill only after the drill bit is out of the hole;

Do not drill with unsecured or weakly secured workpieces;

You should put your hair under your headgear;

Do not press down hard on the drill feed, especially when drilling holes of small diameter;

Never lean too close to the drill bit to avoid eye contact with chips;

What do the various shapes and angles of the drill bit cutting part depend on??

What does the wear on the core hole cutting tool depend on??

What does cutting speed during hole treatment depend on??

What equipment is used for drilling?

What safety rules must be observed when drilling with a hand-held drill??

What is the sequence of drill sharpening??

What types of drills are used in metalwork??

What faults may occur and how to correct them when drilling?

What safety instructions must be followed when drilling with an electric drill??

What safety precautions must be observed when drilling parts?

Mechanical retention of earth masses: Mechanical retention of earth masses on the slope is provided by office facilities of various designs.

Cross sections of embankments and shorelines: In urban areas, shore protection is designed to meet technical and economic requirements, but special importance is given to aesthetic.

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