Howard Lewis | 16/07/2022 10:27:27 |
7227 forum posts 21 photos | There could be a number of nreasons for the Tailstock ,moving back when attempting to drill a hole. 1 Did you use a centre drill? 2 Did you use a pilot drill? (Trying to drill a large hole in one, requires a lot of pressure. ) 3 Are you drills sharp? A blunt drill, or any other cutting tool won't cut, or will require a lot too much pressure. At your stage, there is not much point in extolling the virtues of four facet drill grinding, because you really need a cutter grinder for that. 4 As already suggested, the clamp may need to be tightened. Self locking nut or no, they do need to be reset from time to time to maintain sufficient clamping pressure.
SUGGESTIONS a Tightern the Clamp b Use a centre drill c Drill one or more pilot hole(s More than one if a large hole is the required end product ) The pilot hole allows the centre of the larger drill to be unloaded. (Since it runs at Zero cutting speed , it doesn't do much ) d Check that the drills are sharp. (Some drills are less than properly sharpened. even when new. Cheap drills are a waste of money for a variety of reasons ) DON'T try sharpening drills yourself. It takes skill to grind a drill so that it cuts properly and to size. Some of the cheap drill grinding appliances are of dubius worth. It is easy to melt a plastic one. and some of the metal m,ones are better, but benefit from careful attention to detail. If you take the advice to join a model engineering club, you will learn why and how. e Don't expect a HSS drill to cut hardened steel. Howard
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