Mounting my 5" 4 jaw lathe chuck, 1-1/2" X 8 thread to a 5C collet, looking for ideas

[bmklawt]

Mounting my 5" 4 jaw lathe chuck, 1-1/2" X 8 thread to a 5C collet, looking for ideas

Is there a 5C collet out there that I can mount my 5" 1-1/2" X 8 thread chuck to, I'm just trying to avoid buying a new chuck with a 5C shank.

Your help is greatly appreciated,

 

[crossthread]

That sounds really wonky. Might want to take a different approach.

 

[theperfessor]

I've got a 4" four jaw with a 5C shank. I wouldn't use it for anything but light work, it's hanging waaaaay out there. Why can't you take the collet chuck off whatever it is mounted on?

 

[Illinoyance]

You need a 5C fixture mount.
Victor Machinery - Metalworking tools and supplies

 

[jims]

I don’t think a 5c collet will fit on a 1 1/2 -8 spindle unless you get a 5c collet closer for it.
Jimsehr

 

[L Vanice]

You need a 5C fixture mount.
Victor Machinery - Metalworking tools and supplies

You want one with 2" diameter and 2" thickness to make a 1 1/2-8 thread. EBay will have a variety of sizes, including 2 x 2. Here is one for $24.99 with free shipping.

2'' x 2'' 5C Fixture Mount Precision Lathe Face Plate 2'' Diameter Steel Collet | eBay

If your lathe will not cut the thread, you will have to pay to have it done. I have one 5C threaded jaw chuck mount, a 2 3/16-10 that fits Hardinge chucks. It was a stock item at SPI years ago, but I don't think they sold other sizes. And I have some special Hardinge threaded 5C collets for drill chucks, but they are the only ones I have seen in decades.

It is something I might expect a company like Kalamazoo Industries to make, but they only list one with 1-10 thread, a common USA thread for small chucks.

Kalamazoo Industries 5C collet indexing fixture

Larry