high side on ferrule

NineBallNut

NineBallNut

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I'm just getting into doing repair work on my new lathe. I have a question about shimming a shaft in a 3 jaw chuck to eliminate the high side. I have been practicing on some old junk shafts, which are not truely round.
How do you know where to shim the shaft to eliminate this? Or Is there a better way to eliminate this problem. Again, I am a newbie to this so any advice will be greatly appreciated.

Thanks,
Rob
 
NineBallNut said:
I'm just getting into doing repair work on my new lathe. I have a question about shimming a shaft in a 3 jaw chuck to eliminate the high side. I have been practicing on some old junk shafts, which are not truely round.
How do you know where to shim the shaft to eliminate this? Or Is there a better way to eliminate this problem. Again, I am a newbie to this so any advice will be greatly appreciated.

Thanks,
Rob
Click to expand...

You just use a dial indicator. A little practice and you will get the knack of it. You will discover as you get into it there are things you need you can't really buy and you have to make up. Here is an indicator I made for one lathe where a magnetic base wouldn't work. It is mounted on block that has been hollowed out and filled with lead shot. It weighs about 1 1/2 lb.'s and is very stable.
 

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NineBallNut said:
I'm just getting into doing repair work on my new lathe. I have a question about shimming a shaft in a 3 jaw chuck to eliminate the high side. I have been practicing on some old junk shafts, which are not truely round.
How do you know where to shim the shaft to eliminate this? Or Is there a better way to eliminate this problem. Again, I am a newbie to this so any advice will be greatly appreciated.

Turn your junk shafts round & then practice your ferrule work. You can get a dial indicator from the SEARS TOOL CATALOG. Find the spot where the indicator starts to go couterclockwise. That is the lowest spot. Let's say the lowest spot is where the ".002" is( you can rotate the dial to start at "0") & the hand goes all of the way around to the ".010". That means there is .008 of an inch difference between the highest spot on the shaft to the lowest point. If you use a .004" shim at the highest side, you will be pretty close to centering the shaft. You can use anything for a shim, but paper & other soft materials will compress. On a 3 jaw chuck you can try to rotate the high spot, to one of the jaws. Then re-indicate it & use the right shim. You may have to shim more than one jaw...JER
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thanks for the replies gentleman.

While I was messing around last night I tried using paper shims and turning the shaft in the jaw. I didn't know where to put the shims in correlation to the shaft. I put them on the low side first..lol After some messing around I was able to get it close. Figured I'd come on hear and see what I could find out. The only reason I didn't turn the shaft round is because I figured if a customer brought me one that wasn't true, I wouldn't have the option to turn the shaft so I better learn. I replaced tenons last night both threading them in and just gluing. I am having a blast working on this thing and learning the in's and out's.

Thanks again,
Rob
 
NineBallNut said:
I replaced tenons last night both threading them in and just gluing. I am having a blast working on this thing and learning the in's and out's.

Thanks again,
Rob
Click to expand...
ssssshhhhhhhhhhh!!! You're not supposed to let prospective customers know how much we all enjoy what we do!!! ;)
 
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