Collet chuck questions

rcn11thacr · Feb 27, 2020

I am close to purchasing a Monarch 10ee and one of my jobs will require turning a 37mm part in a collet. So that leads me to an ER 25 collet. Can I use these on this type of lathe?

michael.kitko · Feb 27, 2020

I would honestly look for a Jacobs Collet chuck or Burnered Collet chuck.

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rimcanyon · Feb 27, 2020

rcn11thacr said:
I am close to purchasing a Monarch 10ee and one of my jobs will require turning a 37mm part in a collet. So that leads me to an ER 25 collet. Can I use these on this type of lathe?

Er25 collets only go up to about ⅝”. 37mm is about 1.5”. Not sure how you are going to do that. But to answer your question, yes you can use an ER25 collet holder on a 10EE. But the primary collets for a 10EE are either 5C or 2J, or you can use the Jarno taper in the spindle. So if you really wanted ER25, you should first get either a 5C spindle nose and collet closer, or a 2J collet chuck, then put in a collet to match the size of the ER25 collet holder. If the ER25 collet holder has a 2MT shank, you can use an adapter in the spindle from Jarno to 2MT (standard 10EE accessory).

michael.kitko · Feb 27, 2020

I used a Burnerd at work and fell in love with it. I loved it so much, I had to have one for my home shop and found one rather cheaply. Anyways, they are actually super fast, not quite as fast as a lever operated one, but still fast and accurate. I highly recommend them.

Picture is what they look like.

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rcn11thacr · Mar 3, 2020

Thanks to all for your info and help. My main objective was to find a collet large enough that it will hold a 1-5/8 to a 1-3/4 part. I have a job coming up that will require me to rinse repeat small changes on parts of that size and I’ll need a collet to hold them.

Cal Haines · Mar 4, 2020

Have you considered using soft-jaws, bored to the correct OD? If you bore the jaws and don't remove the chuck, it will have zero runout.

Depending on the what the part is, a large diameter, machinable 5C collet might work: McMaster-Carr

A "pot chuck" or "step chuck" is a similar option: Pot Chucks for 5C Collet Systems - CNCCookbook: Be A Better CNC'er

Cal

AlfaGTA · Mar 4, 2020

Schunk chuck (3 jaw) (Rota-G) with purpose bored top jaws...steel or aluminum depending on volume.
If you buy a dedicated set of master jaws for this setup then you can change them in and out without accuracy loss.....

Allows working on other projects with other jaws....quick change, high clamping power, and not a scroll closing system.

YouTube
Cheers Ross

Cal Haines · Mar 4, 2020

AlfaGTA said:
Schunk chuck (3 jaw) (Rota-G) with purpose bored top jaws...steel or aluminum depending on volume.
If you buy a dedicated set of master jaws for this setup then you can change them in and out without accuracy loss.....

Allows working on other projects with other jaws....quick change, high clamping power, and not a scroll closing system.

YouTube
Cheers Ross

That's a pretty cool chuck, but it looks like you'd be into it for over $4k, not including backplate.

Cal

rimcanyon · Mar 4, 2020

I’d suggest looking for a Hardinge Sjogren 5C chuck with a Hardinge nose on it. They aren’t that rare, I have passed on the opportunity to buy several (I already have an equivalent 2J system). The advantage of the Hardinge nose is that you can use Hardinge 5C pot chuck collet closers, and those are common as dirt and usually don’t sell for big $$. Used 5C pot chuck collets show up all the time on *Bay.

Dave

rcn11thacr · Mar 4, 2020

The total length of the part is 4-7/8 long.

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