BTC Chucks?

mikey said:
As long as the chuck is accurate then it doesn't matter where it is made so be happy, Janderso.

As an aside, the run out of a 3 jaw is not critical. It is a first operation chuck so anything that you turn from nominal stock will be concentric with the spindle and will be accurate. It's when you slap an already turned part in the chuck that the accuracy of the chuck matters and no 3 jaw chuck, aside from maybe the adjust-tru types, will give you balls on accuracy. Just the nature of the beast, so to speak.
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You sound like a machinist in a production shop. ;)

I have lots of uses for a 3-jaw besides being my 'first-op' chuck. And can get the TIR down to nothing on my big chuck. And it repeats to less than a half thou on multiple pieces or a re-chuck. This was my primary use case when shopping for my main 3-jaw, so I wanted something with a good reputation.

Just pointing out that there are different use cases and differences in quality across various chucks. :D
 
wrmiller said:
I have lots of uses for a 3-jaw besides being my 'first-op' chuck. And can get the TIR down to nothing on my big chuck. And it repeats to less than a half thou on multiple pieces or a re-chuck. This was my primary use case when shopping for my main 3-jaw, so I wanted something with a good reputation.

Just pointing out that there are different use cases and differences in quality across various chucks. :D
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Yeah, but you own a PBA set-tru chuck, right? You cheat!
 
Yeah, but in 20 years your chuck will probably still be just as accurate as it is today. I wonder how long a cheap Chinese chuck will hold tolerances.

Talking about cheap, I was just working with my Sherline 3 jaw chuck last night. When I got it, it had 0.001" TIR, which is good for a 3 jaw. I checked it again last night and it still holds a thou. Amazing that a chuck that costs a bit over $100.00 can be that good after 30 years of hard use. Then again, it was made when Joe Martin was still heavily involved with production and the quality of Sherline tools was awesome.
 
mikey said:
As long as the chuck is accurate then it doesn't matter where it is made so be happy, Janderso.

As an aside, the run out of a 3 jaw is not critical. It is a first operation chuck so anything that you turn from nominal stock will be concentric with the spindle and will be accurate. It's when you slap an already turned part in the chuck that the accuracy of the chuck matters and no 3 jaw chuck, aside from maybe the adjust-tru types, will give you balls on accuracy. Just the nature of the beast, so to speak.
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Now that I have a Bison 3-jaw Set-Tru I've been using it more & use my 6-jaw as intended. 6-jaw chucks generally are considered second op chucks but I personally never really had problems using it as my my primary chuck. My love is still for the 6-jaw & I still use it the most. It's so much easier to rechuck a part in it to run true especially when the part is short. With the accuracy of both the 3-jaw & 6-jaw Set-Tru chucks is the reason why I rarely use my collet chuck. In fact I hate using the ER collet chuck. I'd prefer to have a 5C collet closer but that means I'd have to invest in a boat load of 5C collets. I loved using a collet closer, so quick to release & engage swapping a part, in some cases don't even have to turn off the spindle.
 
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