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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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