collet material

sbburke · Jan 7, 2017

Greetings! Would 12L14 make a good collet? I Thank you in advance for any thoughts.

Milland · Jan 7, 2017

For low stress, infrequent use it's probably fine, but if you're going to use it for any length of time you'd likely be much better off with a pre-hard 4xxx steel. What's the application?

dkmc · Jan 7, 2017

Hardinge uses 8620 for 5C's, 16C's etc.

rklopp · Jan 7, 2017

Some 5C emergency collets are 12L14.

dian · Jan 8, 2017

what kind of collet? if you are making something like an er collet i probably needs to be hardened. torque for er32 nut is over 100 lbs ft.

sbburke · Jan 8, 2017

Thank You for the quick responses. Collet is for an older bullet puller to be used in a reloading press,- no motors involved.Only thought of the 12L14 because I have some. Probably have 1144, 8620, 4140, floating around,and 360 brass, but this 12L14 is close in diameter to finished collet.-Rich

stephen thomas · Jan 8, 2017

Don't use the 1144. I thought it ("stressproof) would be good for some collets for woodworking machines i used to sell. The originals are not hardened, so that was not a factor. It machines & especially threads nicely, but tends to close up when slit. If it is machined assymetrically, it can distort. I have used 4140 prehard and like it. 5c E-collets and collets for soft work are sometimes made (can be bought) in brass and in nylon, among other materials, so making one only out of 12L14 for lead or jacketed bullets should work fine for a while, at least. Easy enough to try if you are only making one.

If it needs to be hardened, S7 is about the easiest material to use in the homeshop. Easy machining, air hardening (with foil in a furnace), low distortion.

smt

adh2000 · Jan 8, 2017

stephen thomas said:
Don't use the 1144. It machines & especially threads nicely, but tends to close up when slit. If it is machined assymetrically, it can distort.

smt

What's the point of calling it stressproof then? I would have thought the opposite. In what way is 1144 "stressproof"?

rklopp · Jan 8, 2017

Real "StressProof" does not move much at all. It is designed to have nil residual stress.

jim rozen · Jan 8, 2017

I would suggest that if he wants to save time and money, to simply purchase a steel emergency collet and simply
machine the shape he wants into that.

Sea Farmer · Jan 8, 2017

Anyone know which plastic(s) is/are used for plastic emergency collets?

Limy Sami · Jan 8, 2017

Sea Farmer said:
Anyone know which plastic(s) is/are used for plastic emergency collets?

I've seen nylon 5C's available, and brass come to that.

However the word ''COLLET'' covers a multitude of types (and sins)

Over the years I've made various types ofcollets from our equivalent of 12l14, brass - various, bronzes - various, 6000 & 7000 series Alus, acetal - aka delrin, nylon 6 & 66, PEEK, boxwood, and even PTFE.

All of them did what they were asked to do, so it's down to application.

specfab · Jan 8, 2017

Limy Sami said:
I've seen nylon 5C's available, and brass come to that.

However the word ''COLLET'' covers a multitude of types (and sins)

Over the years I've made various types ofcollets from our equivalent of 12l14, brass - various, bronzes - various, 6000 & 7000 series Alus, acetal - aka delrin, nylon 6 & 66, PEEK, boxwood, and even PTFE.

All of them did what they were asked to do, so it's down to application.

I hope you didn't think that the mention of "boxwood" was going to slip by without a need for 'splainin'...(?) Better fess up ;-)

Davis In SC · Jan 8, 2017

Sea Farmer said:
Anyone know which plastic(s) is/are used for plastic emergency collets?

The "Nylon" Emergency Collets I have are made of Acetal, Commonly referred to as Delrin, which is a DuPont trademark. Actual Nylon would make a poor collet, IMHO. The Delrin machines well, and is not affected by changes in humidity.

Limy Sami · Jan 8, 2017

specfab said:
I hope you didn't think that the mention of "boxwood" was going to slip by without a need for 'splainin'...(?) Better fess up ;-)

European boxwood, Buxus sempervirens Boxwood | The Wood Database - Lumber Identification (Hardwoods)

Davis In SC · Jan 8, 2017

Limy Sami said:
I've seen nylon 5C's available, and brass come to that.

However the word ''COLLET'' covers a multitude of types (and sins)

Over the years I've made various types ofcollets from our equivalent of 12l14, brass - various, bronzes - various, 6000 & 7000 series Alus, acetal - aka delrin, nylon 6 & 66, PEEK, boxwood, and even PTFE.

All of them did what they were asked to do, so it's down to application.

The Boxwood should work well for Square collets......

gbent · Jan 8, 2017

Grabbing a lead or copper plated bullet I expect 12L14 will last a long time. Before you wear the first iteration out you will have a better idea anyway.

Limy Sami · Jan 8, 2017

Davis In SC said:
The Boxwood should work well for Square collets......

It does! in fact anything odd shaped cos you can do all sorts of things with wood chisels, knives etc etc,

Box won't take a drawbar thread, but you can epoxy it in to a metal sleeve

Davis In SC · Jan 8, 2017

Limy Sami said:
It does! in fact anything odd shaped cos you can do all sorts of things with wood chisels, knives etc etc,

Box won't take a drawbar thread, but you can epoxy it in to a metal sleeve

Actually, the Boxwood thing was a result of my strange humor, as in a Square Box. LOL

Limy Sami · Jan 8, 2017

Davis In SC said:
Actually, the Boxwood thing was a result of my strange humor, as in a Square Box. LOL

Very droll minister

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