Cutting Small Collars - Advise Needed

Hello;

We put out an order for about 1 1/4" Diameter x 1" Length brass collars/bushings. When we got them, we realized that we speced the wrong length. We really needed 5/8" long not 1" long. The problem is that we have a huge amount of the wrong bushings which we have been cutting and filing by hand. While this works, it is taking a very long time to do this.

Do they make a chopsaw with a small enough distance between the clamp/vise and balde which will handle such a job?

Thanks

Reply to
Crumb
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I've seen small tubing chop saws but couldn't remember where. I found one that looks perfect at:

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Unfortunately it's $489 so it's probably a bit pricey for your situation.

I think what I would do is mount a small vise on a piece of bar that fits in the guide groove on a band saw and cut them with that.

Best Regards, Keith Marshall snipped-for-privacy@progressivelogic.com

"Even if you are on the right track, you'll get run over if you just sit there." - Will Rogers (1879-1935).

Reply to
Keith Marshall

My obvious first pick for this job would be a lathe. Once set up, I'd guess less than a minute per, to cut these off to the correct length and deburr the cut. Second pick would be a belt sander and a mandrel. Put a collar on the mandrel to set the limit of the cut, slide a bushing over it, and grind away the unwanted portion of the bushing. With a 60 or so grit belt, that should be a minute or so each unit.

If you gotta do it with a chopsaw, make a mandrel that can be held well in the vice, and save yourself the frustration of trying to grip a really short part during the cutoff.

Cheers Trevor Jones

Reply to
Trevor Jones

Wilton markets a small Swiss chop saw that takes 4" cut-off wheels that may work for you. The vise works well enough on small parts (screws & such) but may be a bit whimpy for your application.

Reply to
Mike Henry

--I'd do 'em on a second operation lathe; i.e. anything with a collet closer and a depth stop for the part. Quick like a bunny it'd be..

Reply to
steamer

Apparently you do not have a lathe. Probably more cost effective to have someone do them for you. How many is a huge amount? Should take less than 30 seconds each,complete. Chopsawing will leave burrs to deal with, meaning more handwork. Hand-fed chopsawing brass could be a bit hazardous, given the 'hungry' nature of the material and an interrupted cut.

michael

Reply to
michael

Lathe. Find somebody with a lathe to do this.

Then make the person who sent out the wrong spec take the parts over to the lathe guy and negotiate for the cost to rectify the problem. Out of his wallet...

Jim

-- Sig -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ==================================================

Reply to
jim rozen

Theses are 1 1/4" in diameter by 1" long. My original post may have obscured that fact due to me leaving out the quantity.

Thanks again

Reply to
Crumb

Depends on the size of the lathe. My collets can't grip a

1-1/4" OD (5C stops at 1-1/8"), and the stops might have problems with hitting only the ID.

So -- my choice here would be to use soft jaws on a chuck fitted with two-piece jaws. They can be bored to grip the OD nicely, and form their own depth stop at the same time.

Are there setscrews in the collars? If so, I would suggest that you may want to do this in two passes -- one to take an appropriate length off of one side, and the second pass to take a similar length off the other side (after resetting the lathe's carriage) to wind up with the setscrew centered appropriatedly in the length.

Good Luck, DoN.

Reply to
DoN. Nichols

With a step collet or expanding mandrel this job could be done very quickly in a 5C machine with lever closer.

Ned Simmons

Reply to
Ned Simmons

Yep. A pot chuck would be just the thing. Those are amazingly handy.

Jim

-- Sig -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ==================================================

Reply to
jim rozen

You could put a 1-1/4 diameter hole in a block (probably steel), by

5/8 deep, mount the block in a vise, drop in a bushing, grind it off flush with a 4" angle grinder, de-burr, and pop it out. Ken.
Reply to
Ken Sterling

Second ops lathe with a cross slide and a turret. Take care of each one in a few seconds.

Gunner

"At the core of liberalism is the spoiled child - miserable, as all spoiled children are, unsatisfied, demanding, ill-disciplined, despotic and useless. Liberalism is a philosphy of sniveling brats." -- P.J. O'Rourke

Reply to
Gunner

You use a "pot collet"

They allow you to collet work up to about 6" on a 5C machine

Gunner

"At the core of liberalism is the spoiled child - miserable, as all spoiled children are, unsatisfied, demanding, ill-disciplined, despotic and useless. Liberalism is a philosphy of sniveling brats." -- P.J. O'Rourke

Reply to
Gunner

I was gonna say, even *I* as a rank novice with a turret lathe could manage to set up and run that job....

Jim

Reply to
jim rozen

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