Chuck Too Big ?

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DZ55

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A couple months ago I purchased a Rockwell 11x36 lathe. It came with a 6" 6 jaw chuck. Then this past week I came across a 10" Union 4 jaw combination chuck at a price I couldn't turn down. My question is Can a chuck be too large for a certain lathe?( not meaning swing size) The 4 jaw I bought weighs 95lbs. Is there some type of guideline to go by? Can my 11" lathe handle any chuck that will fit? Thanks.
 
If the chuck is too big, the outside edges of the jaws will want to hit the ways before you have a very large part held in them. Sometimes that can be mitigated by using the steps of the jaws, but with less surface area being clamped, or reversing the jaws. Securely holding a part when the diameter is near the swing size of your lathe is sometimes actually more difficult with a large chuck due to chuck jaw to way clearance issues. Hope that makes sense...
 
My 16 inch lathe came with a 15 3/4 inch 4 jaw from the factory. Only complaint is it will only close to 1 inch so someday I'll pick up a smaller chuck for it. The weight of the chuck would have to be subtracted from the weight capacity of the lathe.
In my case the capacity at the spindle is 1000 pounds, the chuck weighs 140.

Greg
 
f350ca said:
My 16 inch lathe came with a 15 3/4 inch 4 jaw from the factory. Only complaint is it will only close to 1 inch so someday I'll pick up a smaller chuck for it. The weight of the chuck would have to be subtracted from the weight capacity of the lathe.
In my case the capacity at the spindle is 1000 pounds, the chuck weighs 140.

HERE's A PLUS . AT 100+ POUNDS , THE FLYWHEEL EFFECT WILL OVERCOME THE SHUDDERING OF AN INTERRUPTED CUT .
Click to expand...
 
From the Logan Lathes FAQ: http://www.lathe.com/faq/#_Toc95180284

What is the right size chuck for this lathe?

Logan supplied a 5” 3-jaw chuck and a 6” 4-jaw chuck for their 10” lathes. Logan supplied a 6” 3-jaw chuck and a 6” 4-jaw chuck for their 11” lathes. Larger chucks were available, but they are impractical on these lathes because the jaws would hit the bed when the chucks were opened. Larger chucks are also heavier, so they put a strain on the spindle and spindle bearings. In general, use the smallest possible quality chuck for the job.

I also own an 11" lathe and the largest chuck I have is 6.5". It has enough capacity to turn the largest piece I've ever had to turn so it works for me. I definitely would not go with a 10" chuck due to the potential for a jaw to contact the ways.
 
Thanks for all the input, heard some things I didn't think of, and it all makes sense. I Love this site!!
 
If you were a little closer, I'd offer to play swap out for one of my 8" Adjust-True chucks for your 10" combination chuck. Shipping would be a killer at the moment!
 
If you were a little closer, I'd offer to play swap out for one of my 8" Adjust-True chucks
for your 10" combination chuck. Shipping would be a killer at the moment!

EXPERIENCE THE MIRACLE OF FLAT RATE PRIORITY BOXES AT THE POST OFFICE .
THE LARGE SIZE BOX IS 12" x 12" x 5.5" & SHIPS ANYWHERE IN THE USA FOR $18.75 .

A 10" CHUCK WILL FIT IN A 12" BOX . YOU MAY HAVE TO REMOVE THE JAWS & POSTS .
THE ONLY BUGABOO IS THE 70 POUND LIMIT . IF IT's CLOSE , YOU COULD SEND THE PARTS SEPARATELY .

DSC_0185.JPG
 
IMO that chuck would be too big. Many reasons say no. The inertia would be dangerous. The weight of the chuck on the head stock bearing(s). You are not going to find a mounting/back plate and would need to fabricate one. If the lathe has a threaded spindle, heaven forbid if you ever ran the lathe in reverse…Dave.
 
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