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Crawford multibore collet chuck

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Manxmodder:
 :thumbup: Looking good chipenter.

I agree the ground finish does look rather coarse to be original. You could always true the cone area up by
taking a light cut on the taper with a indexable boring bar fitted with a cubic boron nitride (CBN) insert tip.

They work a treat for turning  hardened steel and would ensure concentricity to your headstock.

Link to CBN inserts I have used for such purposes in the past:
http://www.shop-apt.co.uk/cbn-turning-inserts.html

EDIT TO ADD: I emphasise only a light cut,a couple of thou may be all you need to get concentricity.

OZ.

chipenter:
Put a clock on the taper zero run out , I have a toolpost grinder and a small diamond stone , but will try triple 0 emery first .

seadog:
I wouldn't rely on the silver steel being ground true.

Manxmodder:

--- Quote from: chipenter on April 15, 2016, 04:21:50 PM ---Put a clock on the taper zero run out , I have a toolpost grinder and a small diamond stone , but will try triple 0 emery first .

--- End quote ---

Just re-read your earlier post where you say 4 thou run out at 11" from chuck.

It would be interesting to see what sort of run out reading you get with a shorter test piece and clocking closer to the chuck.....OZ.

chipenter:

--- Quote from: Manxmodder on April 15, 2016, 07:49:10 PM ---
--- Quote from: chipenter on April 15, 2016, 04:21:50 PM ---Put a clock on the taper zero run out , I have a toolpost grinder and a small diamond stone , but will try triple 0 emery first .

--- End quote ---

Just re-read your earlier post where you say 4 thou run out at 11" from chuck.

It would be interesting to see what sort of run out reading you get with a shorter test piece and clocking closer to the chuck.....OZ.


Les than half a thow , I cant find any info on this chuck as it's no longer made , the angles vary from 14 , 14.5 to 15 degrees for the outher collet sizes .

--- End quote ---

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