TIR on a 5C Collet Lathe Chuck

P

puzzler_ken

Registered
Registered
Well I finally got rid of my Jet 9x20 and replaced it with a Sieg C4 from LMS.
In order to use my existing 5C collet chuck on the new lathe, I had to buy a back plate
to fit the C4 and scrap the back plate that was used on the Jet 9x20.
After mounting the 5C chuck on the new back plate and installing the chuck on the C4,
I wanted to get an idea of the TIR of the chuck on the new lathe.
I used my B&S BestTest indicator on the chuck bore just inside the mouth.
I measured around .003 in runout. Is this typical for a chuck of this type or
is it excessive which means that I have some work to do to minimize it?

TIA
Ken
 
" Is this typical for a chuck of this type or
is it excessive which means that I have some work to do to minimize it?"

You would have to qualify the word "typical". It would depend on what brand chuck you have. I would have to think for a good quality collet chuck that would be excessive. If it's a chinese chuck like a couple of them I've had...that would be exceptional.

Chuck
 
I have (had - just sold it) an Emco-Maier Super-11 lathe. I had a Hardinge-Sjogren 5C speed collet chuck for it. Because I was putting it up for sale (it is sold), I had reason to measure the TIR to include in the listing. Using a Hardinge 5C-5ST collet and a 0.875" tool steel bar, the TIR measured out 3" from the nose was 0.0005" It's pretty amazing! When discussing TIR one must start at the spindle. On my Hardinge HLV-H, the spindle run-out measured using a dial indicator with graduations of 0.000,050" is < 0.000,025" Then, when using high quality collets, you hope to carry that tolerance out from there. Believe me, cheap collets are a real gamble if precision is what you're looking for. Just my 2 cents worth.
 
Hi Ken-
I bought a Bison 5C Collet chuck with the D1-4 backing plate from Grizzly about six months ago and it was advertised with .004 TIR with a dial test gage reading in tenths, it read .0000, unbelievable as I mounted it on a very old Clausing 1500 American made lathe. The entire set up was the most reasonable cost from anyone; Grizzly even beat the pants off eBay advertisers... Very happy with my purchase, I bought Bison chucks back in the mid 70's and their quality was outstanding then as well.

Ray
 
I bought a non us one and turned the back plate a few thousands under size, put in a good harding collet and a plane plug gage, indicated it in to .0002 works great.
 
You must log in or register to reply here.
Back
Top