Drill begins to wear out from the periphery of the cutting edge, due to the fact that on the periphery of the tool cutting speed is much more than the tip, so there is a maximum temperature, and heat when drilling from the corner cutting edge is difficult. Then abrade the rear surface of the tip of the drill. On the rear surface of the risks coming from the cutting edge. When wear of the drill, the risks are merged into one continuous strip along the entire cutting edge. As soon as possible to begin the process of regrinding the drill to the grinding machine to reduce the removable layer, and extend the life of the tool. When sharpening is necessary as to follow the shape of the sharpening of drill bits to maintain the desired cutting properties after sharpening.
drill Sharpening can be performed manually on the emery or grinding machine.
Machines for sharpening drills, no matter the material are domestic and industrial. Domestic grinding machines is quite compact and well suited for home work.
industrial machine for grinding drills, you can do the following
suitable For home machines for sharpening drill bits the type of Drill Doctor and its Chinese counterparts. Basic sharpening drill bits on the machine is accurate alignment of the axis of the drill in the Chuck.
I Think you need to clarify that a fine drill bit with a diameter of 2-3 mm is good to sharpen fails because the accuracy of the machine not designed for it. In this case, you will need a special machine.
don’t forget that the cutting material of the drill does not tolerate overheating. When regrinding solid carbide materials crack, and high speed lose their hardness. When regrinding on the grinding machine need often to cool the drill with water or air, if the drill was steaming better it cool slightly at room temperature.
All of the machine for sharpening drills have design
the Main part of the machine for sharpening of drills consists of a fixed base and a removable tool holder with holes for drills of different diameter.
To the base at an angle of 30-32 degrees (angle dependent on the angle of drill point) is attached to the rail with a beveled side face with a 25-30° angle. The rail guides to the desired angle tool holder with sharpening drill relative to the grinding wheel. One of the sidewalls of the holder has an angle of 60-65°. The sidewall of the tool holder is pressed against the rail at the base that provides the front sharpening angle of the drill with the desired geometrical parameters on the machine for sharpening drills.
Please note that the cutting edges after sharpening on the drill sharpening machine drill length should be equal, and inclined at the same angle to the drill axis. The size of the transverse cutting edge at the correct sharpening of the drill in the machine should not be exceed 0.5 mm for drills with diameter less than 8 mm, if more it needs to be up to 1.4 mm.
drill Sharpening on the machine BSM 20
Hold the drill with the screw. Lightly grip the drill, it must turn in the prism. Now install the main cutting edge drill in the direction of shown in the figure. With the screw-tighten the lens.
prism is clamped in it with the drill mounted to the stand mount of the prism and clamped and screw. Scale is set right angle drill (standard 118° angle) Desk clamped arm.
-left scale: the stand is given to the left
-right scale: the stand is given to the right
by feeding the prism and flow of the engine position the drill before grinding around. Carefully setting the flow of the prism, at the same time turn it and sharpen the first cutting edge of the drill
gun nose drill
Drill bit fixedly clamped in the prism.
the Mounting of the prism to fix the hole .
Rack mounting the prism set according to a scale position.
Using flow prism and the pitch of the engine supplied drill bit to the grinding circle and podnachivaet a jumper wire between the transverse cutting edges of the drill. Remember the feed value of the prism and attach the drill bit ago (about 3 turns). The flow of engine not touch.
Turn the prism for 180° and repeat all for the other side of the drill.
Additionally posted a video on sharpening drill bits on the machine.