Making High Speed Steel Injector D Bits

[Anonymous]

Posted by Steamer1915 on 17/06/2019 19:03:40:

If you are grinding between centres, the centres should not rotate. This removes any inaccuracy created by the spindle bearings.

Well, I never knew that. Having looked at the sectional drawing of the workhead spindle on my grinder it does indeed look as if the centre does not need to rotate. However, on the real workhead, where the nose fitting is different, the centre does rotate. The spindle has a indent lock, but it locks the whole spindle, not just the centre. I can't work out how to get the nose fitting off, and if I use too much BF&BI something is going to get broken.

For the time being I'll stick with what I've got. I can grind to size and parallel to tenths, which is the minimum I can measure, and fine for my needs.

Andrew

[Author]

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