Rebuilding a CHNC I Collet Closer

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24 Mar 2010 21:20 - 24 Mar 2010 21:23 #2432 by BigJohnT
Once I figured out that all the O-Rings and Quad Rings were available from McMaster - Carr I was on my way.

Here it is all apart. The fun part was getting the bearing housing off without messing up the bearings. Take your time with it and it will come off. Oh, and close the collet first as if you leave it open and the rings seal at all it will have pressure when you try and take it apart.



John
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24 Mar 2010 21:26 - 24 Mar 2010 21:26 #2433 by BigJohnT
This is the inside of the bearing unit. There are no seals in here so after you open or close the collet the valve needs to be closed ie a three way valve. Mine for some reason had a two way valve so either one side or the other had air all the time so it leaked like a sieve...



John
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24 Mar 2010 21:28 - 24 Mar 2010 21:28 #2434 by BigJohnT
This picture shows the valves built into the piston that hold the air pressure until air is applied to the opposite side.



John
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24 Mar 2010 21:29 - 24 Mar 2010 21:30 #2435 by BigJohnT
All cleaned up new O-Rings and Quad Rings installed ready to assemble.



John
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24 Mar 2010 21:31 - 24 Mar 2010 21:31 #2436 by BigJohnT
Assembling the air piston.



John
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24 Mar 2010 21:33 - 24 Mar 2010 21:34 #2437 by BigJohnT
All back together. You have to install the first bearing all the way to the shoulder by gently tapping on the inner race till snug then install the rest of the bearing unit by tapping on the outer bearing inner race GENTLY. It will go...



John
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24 Mar 2010 21:35 - 24 Mar 2010 21:40 #2438 by BigJohnT
The worn part that I replaced from McMaster Carr. I have a lifetime supply of everything except the large Quad Rings.
  • 2pcs 9452K18 AS568A - 016 O-Ring
  • 2pcs1879T23 AS568A - 010 O-Ring
  • 1pc 5308T233 AS568A - 166 O-Ring
  • 2pcs 90025K617 AS568A - 261 Quad-Ring
  • 1pcs 90025K388 AS568A - 227 Quad-Ring
  • 1pcs 90025K464 AS568A - 229 Quad-Ring



John
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22 Sep 2013 19:58 #39108 by gmouer
the pictures have disappeared from this thread. Any chance there is a copy of them around anywhere? Planning a mod to this collet closer and some pics would sure help.

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23 Sep 2013 17:55 #39132 by BigJohnT
I wonder what happened to the photos... the edits look strange to me all withing a few minutes and not done by me.

I can't find the photos...

JT

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23 Sep 2013 18:52 #39135 by gmouer
Oh well, it was worth a shot to ask, just in case you had copys of the pics floating around. Thanks for looking into it.

Did you ever get the air leakage rate under control?

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