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Harold Hall's Advanced Grinding Rest

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Thor30/07/2017 07:16:46
1228 forum posts
37 photos

Hi John,

Congratulations, your grinding rest looks very nice. You just need a simple indexer to make the graduations on the feed knobs, Harold's simple one using a lathe change-wheel isn't difficult to make.

Thor

JOHN BRIDGE 130/07/2017 09:33:17
104 forum posts
11 photos

Hi Thor,

Thanks Thor, yes I was thinking of making Harold's indexer, I have quite a few Myford change-wheels but I want to make some of the accessories first so that I can use the rest.

John

Bob Mc30/07/2017 10:51:32
150 forum posts
1 photos

Grinding jig end view I didn't need to make the grinding rest since I already had something very similar, but I did make the End Mill sharpening jig ... however I thought that the original design was over complicated and I dispensed with the bushes fitted to the MT2 collett holder and the bush for the probe rest... I also cheated by purchasing an MT2 collett holder with 1" straight sides, so all I needed to do was drill through the end to fit the collett securing screw.

You may also see that I did not make the locating fitting on the end as in the original, that also seemed a bit over complicated, so I just made a wheel with countersunk locating holes which an M6 screw fitted into, the end of the screw is turned to a slightly larger angle than the countersink giving a positive lock, this fitting is only used when grinding the end of the milling cutter.

When the collett holder is required to rotate as in sharpening the flute edges, the end wheel is taken off and and re-fitted 180 degrees back on the collett holder, a small step turned on the wheel for about 3mm stops the wheel from touching the M6 locating screw as mentioned previously.

Well...it works ok... Bob..

Grinding jig side view

BOB BLACKSHAW03/06/2020 17:14:02
299 forum posts
64 photos

What size dovetail cutter would be recommended for this rest, and also Duncan noted that a magnet method rather than a dovetail what is meant by this.

Thanks Bob

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