1 drilling
The method of drilling a workpiece through a drill using a drill bit is called drilling. The drilling tolerance is below IT10 and the surface roughness is Ra12.5μm, which is mostly used for roughing holes. Drilling on the lathe As shown in Figure 1, the workpiece is clamped onto the chuck and the drill bit is mounted in the taper hole of the tailstock sleeve. Before drilling, first flatten the end face and drive out a central pit or use the center drill to drill the center hole as a guide. When drilling, shake the tailstock handwheel to make the drill bit feed slowly, and pay attention to often withdraw the drill chip. The drilling feed should not be too strong to avoid breaking the drill bit. The cutting fluid should be added when drilling steel.
Figure 1 drilling on a lathe
 Drilling considerations:
1) Drilling should make the feed amount small, and the drill can be drilled normally after all the heads of the drill enter the workpiece.
2) When drilling steel parts, cold cutting liquid should be added to prevent annealing due to heat generated by the drill bit.
3) When drilling small holes or drilling deep holes, since the iron filings are not easy to discharge, the chip removal must be frequently withdrawn, otherwise the drill bit will “bite†or break due to the blockage of iron filings.
4) When drilling small holes, the speed of the front should be selected faster. The larger the diameter of the drill, the slower the drilling speed.
5) When the drill bit is going to drill through the workpiece, the axial resistance is greatly reduced because the chisel edge is first drilled, and the feed speed must be slowed down. Otherwise, the drill bit is easily caught by the workpiece, causing the taper shank to be inside the bed sleeve. Slip and damage the taper shank and the taper hole.
Causes and prevention of waste generated during drilling:
Table Causes and prevention of waste generated during drilling
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