ID odd faceplate function + ID dividing head make

[RainbowsParticipant @rainbows]

Was about to take this spare backplate and machine it to match a new taylor chuck, then I notice it isn't actually a backplate

There are 4 countersunk holes and a very fine/now worn knurl on the OD of the nut. There is a radial hole in both parts for tightening with a tommy bar.

Can't think it was a particularly fast or simple thing to make so it seems a shame to turn it into a simple backplate without trying to know its purpose.

The collet is 5/8" on the body with a 5/8x20TPI thread on the end. No internal thread. Increases to 0.915" over ~0.650". Working height is 2". Could be homemade, not sure. Would be nice to know what the collet standard is, what machine it has come off if any.

[RainbowsParticipant @rainbows]

[Rex HanmanParticipant @rexhanman57403]

Deleted

Edited By Rex Hanman on 12/07/2017 22:42:29

[Neil WyattModerator @neilwyatt]

I'd guess it was a fixture for something that could be held using the four countersunk holes. Perhaps some special part or perhaps just wooden bowls!

Neil

[HopperParticipant @hopper]

'Tis a mystery why they would screw a bowl, or odd shaped part to be turned etc, to the one piece and then screw that piece onto the backing plate, instead of just using a faceplate or backing plate with the four screw holes straight through that.

Perhaps it was used for repetition work where the threaded ring screwed onto different machines for different steps of machining, eg mill etc? But four countersunk holes does not seem like real firm location for complex machining like that.

[Neil WyattModerator @neilwyatt]

Posted by Hopper on 13/07/2017 00:54:40:

'Tis a mystery why they would screw a bowl, or odd shaped part to be turned etc, to the one piece and then screw that piece onto the backing plate, instead of just using a faceplate or backing plate with the four screw holes straight through that.

Or they may have had multiple screw on parts? A sort of master/slave system.

Neil

[BazyleParticipant @bazyle]

The four countersunk holes might have been a later addition when somebody did decide to use it for mounting bowls. The fact that the outer ring was knurled implies it was intended to be put on and off lightly and often.

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