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Old 05-30-2017, 01:19 PM   #1 (permalink)
 
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Default Using Pin Chucks

I spent some time over the weekend delving into the world of kitless and closed end pens. One issue I ran into is getting the drilled blank to turn true on the pin chuck - I keep getting a wobble. The blank is well seated on the pin and it turns fine, but results in a slightly out-of-round condition. Is there a trick to mounting the blank on the pin chucks?
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Old 05-30-2017, 01:24 PM   #2 (permalink)
 
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Does the pin have any runout before you slide the barrel onto it?
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Old 05-30-2017, 01:34 PM   #3 (permalink)
 
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Does the pin have any runout before you slide the barrel onto it?
No, it seems like the blank is not perefectly parallel with the pin.
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Old 05-30-2017, 01:40 PM   #4 (permalink)
 
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Do you have a dial indicator that you can zero on the pin chuck and turn the chuck by hand? To see if there is any wobble?
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Old 05-30-2017, 01:46 PM   #5 (permalink)
 
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Do you have a dial indicator that you can zero on the pin chuck and turn the chuck by hand? To see if there is any wobble?
yes, I'll check that tonight
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Old 05-30-2017, 01:51 PM   #6 (permalink)
 
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Bill,

I HAD one pin chuck that was a loose sloppy fit into the brass tube. The slop allowed the tube to skew to the side enough to be a problem. I could compensate with shim stock, but the hassle was not worth the replacement cost, and got an expansion style to replace it.

If there is not slop inside the tube, time for a dial indicator and careful checking.
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Old 05-30-2017, 02:03 PM   #7 (permalink)
 
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Maybe I should clarify a bit. I'm turning an ebonite blank for the cap end of a fountain pen. I've drilled up to 1/2" of the closed end of the blank. Since there's no brass tube, is it possible the pin is causing the blank to skew a bit when it "grabs" in the flat of the rod?
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Old 05-30-2017, 03:21 PM   #8 (permalink)
 
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Might be digging into the wood which would deform it.
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Old 05-30-2017, 03:40 PM   #9 (permalink)
 
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Quote:
Originally Posted by bjbear76 View Post
Maybe I should clarify a bit. I'm turning an ebonite blank for the cap end of a fountain pen. I've drilled up to 1/2" of the closed end of the blank. Since there's no brass tube, is it possible the pin is causing the blank to skew a bit when it "grabs" in the flat of the rod?
How tight is the rod when you're pushing it into the blank?

The ones that Rick Herrell made for me were a perfect fit, and it was a struggle to get them into the hole because they were acting like a piston in a closed cylinder. (He machined a small groove in the next ones he made for me, to act as a pressure relief )

If you can push the blank onto the rod with no effort, it's too loose, and you will get some twist when the pin locks in place.
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Old 05-30-2017, 04:27 PM   #10 (permalink)
 
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I use pin chucks very often. I would say two things:

First, if the piece is on the chuck without pin and if I pull it suddenly off, I want to hear a "ploc", something like the sweet noise of a cork out of a wine bottle. If not, the pin may hold it tight, but it will be out of center.

Second, a pin chuck is great for finishing/sanding, not too bad for very light final turning, but very clumsy for roughing. So I use the tail stock as long as possible, which mean a little extra-length ebonite I turn out at the end.

Hope it helps.
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