[4]

Poor Man's Collet Chuck

Rangemaster1

Gunsmith
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Joined
Sep 9, 2014
Messages
90
I occasionally have a project where a collet would be useful in my lathe. I have a 5C collet closer for it, but the setup takes too long because of the spider on the outboard end of the headstock. Everything needs to come off, including the lathe gear cover, spider, the chuck and then back on which can take up an hour or more. It's not worth the aggravation for a quick one off job that's too small for the four jaw.

After some thought and looking at the cost of a collet closing chuck, I chose to make a “poor man’s” collet chuck. I had an ER 40 R8 chuck that was searching for a purpose. I also have a fairly good set of ER 40 collets.

I set up the chuck in my four jaw, cut the R8 mount off the ER 40 chuck and bored out the back end of the chuck so stock of up to one inch would pass thru. With the spider for outboard support, I can work with stock of up to about three feet, depending upon diameter.

Now I dial in the ER chuck in my four jaw ( ten minutes or less) and I'm off and running. The TIR is + or – 2 ½ tenths, repeatable.

One caution, those chucks are really hard. I used a carbide cutoff and boring bar for the work.

image.jpg image.jpg image.jpg
 

FOMOGO

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Sep 2, 2013
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2,054
Necessity is the mother of invention they say. Nice job. Mike
 

brino

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Jan 2, 2014
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That looks like a great solution!
-brino
 

newbydave

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Dec 25, 2012
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I occasionally have a project where a collet would be useful in my lathe. I have a 5C collet closer for it, but the setup takes too long because of the spider on the outboard end of the headstock. Everything needs to come off, including the lathe gear cover, spider, the chuck and then back on which can take up an hour or more. It's not worth the aggravation for a quick one off job that's too small for the four jaw.

After some thought and looking at the cost of a collet closing chuck, I chose to make a “poor man’s” collet chuck. I had an ER 40 R8 chuck that was searching for a purpose. I also have a fairly good set of ER 40 collets.

I set up the chuck in my four jaw, cut the R8 mount off the ER 40 chuck and bored out the back end of the chuck so stock of up to one inch would pass thru. With the spider for outboard support, I can work with stock of up to about three feet, depending upon diameter.

Now I dial in the ER chuck in my four jaw ( ten minutes or less) and I'm off and running. The TIR is + or – 2 ½ tenths, repeatable.

One caution, those chucks are really hard. I used a carbide cutoff and boring bar for the work.
Nice repurpose of the r8 collet holder
 

kd4gij

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Feb 7, 2011
Messages
4,862
I made an er40 coollet chuck that screws on my spindle. But I bave been knowen to chuck it in my 4 jaw a time or 2.
 

T Bredehoft

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Dec 27, 2014
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3,136
I'm with kd4gij, that's exactly what I did. Started out holding the bar stock in my 4 Jaw, chased the 1" 10 threads on the inside of the end and bored the pilot. Screwed it on the spindle and made an ER 40 holder out of it.
 

kingmt01

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Registered
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Apr 29, 2015
Messages
899
I've thought about clamping my little tiny chuck from my mini lathe in the 10" to work on small work. I may still give that a try. Maybe I'll get lucky & find a copy setup someday.
 
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