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Posted by Richard Edwards on May 23, 2008, 1:31 pm
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On Fri, 23 May 2008 06:46:30 +0100, Richard Edwards
>I have a set of ER32 collets and am considering making a collet chuck
>for my Viceroy Lathe. It would be similar to the ERM100 shown on
>http://chronos.ltd.uk/acatalog/Myford_Lathe_Compatible_Acessories.html
>
>The only question is what material? As this is going to screw onto the
>spindle chuck mount 1.5 inch x 8 TPI I feel that Cast Iron would be
>best, though I am a bit concerned about the longevity of the
>relatively fine Collet nut thread.
>
>Opinions?
>
>Obviously my existing collet head fits the MT3 spindle taper but does
>not allow bar "up the spout". Overhang would also be reduced with a
>proper spindle mount head.
>
>
Thanks for all the comments with a particular "thank you" to Keith for
a long scribe and a PDF.
I will be using steel, got an offcut allocated.
I will buy the nut, in fact a bearing type which increases the
available clamping force.
I did consider the backplate and bought collet chuck option but felt
it looked "ungainly".
The "bought direct from Hong Kong" items were interesting.
Particularly as the ER11 range did not go as small a bar size as the
ER16 and ER20. My collet set is 18 off from Nominal 3 to 20. If I find
I need smaller then a few ER16 plus another "home made" chuck would be
the way to go. The vendor is noted.
All I need to do now is work out the change wheel set to give me 8 TPI
from my 3mm leadscrew.
BTW If anyone needs any 1 3/4 brass bar I know of a source at a good
price. 4 foot lengths. (they are bar ends!)
--
Richard
Email address is valid but remove burrs before sending!
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>for my Viceroy Lathe. It would be similar to the ERM100 shown on
>http://chronos.ltd.uk/acatalog/Myford_Lathe_Compatible_Acessories.html
>
>The only question is what material? As this is going to screw onto the
>spindle chuck mount 1.5 inch x 8 TPI I feel that Cast Iron would be
>best, though I am a bit concerned about the longevity of the
>relatively fine Collet nut thread.
>
>Opinions?
>
>Obviously my existing collet head fits the MT3 spindle taper but does
>not allow bar "up the spout". Overhang would also be reduced with a
>proper spindle mount head.
>
>