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Drilling sliding scales

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Terryd	03/11/2012 08:50:54
1946 forum posts 179 photos	Hi all, I am about to fit a new vertical scale to my milling machine and need to drill the scale to connect to the quill. Is there anything I should know before starting, will normal HSS drills do the job? Thanks in advance Regards Terry
Douglas Johnston	03/11/2012 09:12:21
814 forum posts 36 photos	I did this a while ago and found that a HSS drill was no good. I ended up using a solid carbide drill and this proved to be ideal. You could use a clamp type fixing which would eliminate the need to drill the scale. Doug
Terryd	03/11/2012 10:14:37
1946 forum posts 179 photos	Hi Doug, I may go down teh clamping route initially. Thanks for the information. Best regards Terry
colin hawes	03/11/2012 11:54:00
570 forum posts 18 photos	I think you ought to forget drilling scales when clamping is perfectly adequate. Colin
Ian P	03/11/2012 13:17:16
2747 forum posts 123 photos	I have had no problem drilling the common 'stainless' Chinese calipers with ordinary HSS twist drills, in fact I have tapped M4 threads into them as well. When drilling you need to apply lots of pressure so that you can take a good cut rather than letting the drill rub. Ian P
Michael Cox 1	03/11/2012 13:27:04
555 forum posts 27 photos	I also had no problem drilling cheap Chinese digital caliper using HSS drills. It cuts easily with a hacksaw. As Ian said maintain a good pressure to prevent work hardening. Mike Mike

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