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Old 01-02-2014, 03:14 PM
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Randyjaco Randyjaco is offline
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Default Internal Grinding Arbor for TP Grinder- Simple soution

A while back I purchased a Dumore #44 Tool Post grinder for cheap on Ebay. A few of the components were missing, but that is why I got it cheap. Two of the things missing were the internal grinding arbors. I have been searching EBay for several months looking for these somewhat rare arbors. Finally I found an 1/8" one for @$70 and bought it, but what I really wanted was the 1/4" version and it is even scarcer. I got to thinking that I might could fabricate one. I thought about copying the 1/8" one but it looked difficult to make. At the time I grabbed a pneumatic die grinder and noticed that that collet system might be converted to what I wanted. I went down to the local Harbor Freight and found a likely candidate for 13 bucks. I started disassembling it and found that the collet assembly was threaded and Lock Tite'd to that motor shaft. I heated it and unscrewed the assembly from the arbor. Much to my surprise I discovered that the threads were 3/8"- 24. That is the same thread as my Dumore spindle! All I had to do is fabricate a spacer and screw it on. It works great. So for @13 bucks and an hours labor I have a dynamite 1/4" spindle. Not only that but found a 1/8" collet that fits the assembly from another hand grinder. So the whole problem of the internal spindle is solved. So it looks like that Dumore spindle I bought on Ebay will go back up for sale on EBay 8^)

The first picture shows the Dumore spindle on the right and my new HF spindle on the left. The next picture shows the HF grinder box and the last two show everything put together and operational. I like my arbor better than the Dumore.

Randy
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Old 01-02-2014, 03:28 PM
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GWIZ GWIZ is offline
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Can you post a picture of the pneumatic die grinder 3/8-24 end?
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Old 01-02-2014, 05:06 PM
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Quote:
Originally Posted by Randyjaco View Post
So for @13 bucks and an hours labor I have a dynamite 1/4" spindle. Not only that but found a 1/8" collet that fits the assembly from another hand grinder. So the whole problem of the internal spindle is solved. So it looks like that Dumore spindle I bought on Ebay will go back up for sale on EBay 8^)
Randy
lol
That's really funny as hell.
Congratulations, Randy.
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Old 01-02-2014, 06:26 PM
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Quote:
Originally Posted by GWIZ View Post
Can you post a picture of the pneumatic die grinder 3/8-24 end?
You have to pill the rotor off,put it in a vise, heat the collet shaft and twist it off the rotor shaft.

Randy
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Old 01-05-2014, 09:50 AM
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Wow, nice find and great discovery..

I've been looking at getting a Dumore to.. I missed a no7 while back for 100.00 on CL..
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Old 01-05-2014, 10:22 AM
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Dumore with less.
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Old 01-06-2014, 04:43 PM
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Nicely done.
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Old 03-07-2015, 06:23 PM
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I just wanted to thank Randyjaco for this thread.

I found a nice MATCO mini grinder at a Pawn Shop in AZ. The owner made me a great deal on it. He didn't realize that it wasn't a die grinder when he took it in. It had been out for sale quite a while before I showed up.

I got the grinder and a CM 1-1/2 ton lever chain hoist for $40.00.

I remembered this thread and figured it would be cheap to convert the grinder to a collet nose. I did look for these little grinding wheels but couldn't locate a supplier that sells them at a reasonable cost.

Yep, the thread on the grinder is 3/8-24tpi and so is the collet nose I took off an HF die grinder. Cheap and easy!

It's definitely nicer than the inexpensive die grinders I have in the shop.

Thanks Randyjaco!
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