View Full Version : What Are These

02-01-2010, 10:19 PM
I have a can half full of these and donot know what they are. Can someone tell me what they are and if they are worth anything? Thank you for any help.

02-01-2010, 10:28 PM
Those look like some kind of adjustable stop collars. Might be worth something to somebody.

02-02-2010, 01:16 AM
I have a can half full of these and donot know what they are. Can someone tell me what they are and if they are worth anything? Thank you for any help.

They are whatever you want them to be. Whatever other intended purpose they may have had, those are basically shaft collars or knobs. Non-marring. Slide them on a shaft and lock them down. For example, put one on each side of a bearing pillow block to hold the shaft in place axially.

You could also probably modify them to make gear hubs, flexible couplings, etc. As suggested above, they could be used adjustable stops. For example, mount a shaft on the front of your mill table with a couple of those and put a couple limit switches on the saddle for them to hit. Or make hard limits for any sliding mechanism.

Stick a shaft in the side of something, slide a gear over the shaft, then lock one of those collars on to hold the gear in place. Looks like you have a couple shafts with threaded ends in the can too.

Use a few as drill bit depth stops.

One on the end of a shaft can provide a way to crank turn it by hand with the knurl or crank it with a wrench. Stick one on a motor shaft with a wrench and a spring scale for torque measurements. Stick one on a potentiometer or switch, if it is the right size.

Bore the hole out larger, as needed. Turn off the extra material when it gets in the way.

Hold onto them. Before long, you may be lamenting that the can is empty and getting out the slitting saw, taps, reamer, etc. to make more.

Here is a rigid coupling, for a stepper motor, which I machined out of a hunk of scrap brass a long time ago:
Basically, equivalent to making two collars out one piece of material and only cutting them half way apart. Note it is stronger if you counterbore the screws instead of machining the flat. There is a crack at the stress riser, as seen in the micrograph, though the part lasted 20 years. Cut the two pieces differently, and you have a flex coupling. Recently taken out of service when I changed motors. 5 drilling operations with three sizes of bits, one reaming operation, , turned, faced on two sides, counterbore/slot with end mill, tap 2 holes, and two passes with a slitting saw. About 13 different machining operations and 5 setups for one simple $12 part. Yours also had knurling and cutting the hex facets.

02-02-2010, 08:29 AM
It appears they are threaded, plus the hex and knurl hint that they are spun on a threaded shaft to adjust.

My guess is a production machine setup of some kind. I have no experience with mechanical screw machine setup but I can imagine parts like this might be involved.

John Stevenson
02-02-2010, 09:47 AM
Don't know what they are but I have a bucket of left hand ones.