How do I attach a disk to a motor: I have a small motor which has a 0.2" diameter shaft. I want to attach a disk about 5-6"in diameter. The disk would in plastic. What is an in...

BebuLamar

I have a small motor which has a 0.2" diameter shaft. I want to attach a disk about 5-6"in diameter. The disk would in plastic. What is an in expensive way to do this?

dustie Loc: Nose to the grindstone

BebuLamar wrote:

I have a small motor which has a 0.2" diameter shaft. I want to attach a disk about 5-6"in diameter. The disk would in plastic. What is an in expensive way to do this?

I'll make a guess there is no threaded end on the shaft.

A collar with a set screw locker? ......if you can find a way to attach the disc to the collar.
The specialty fastener drawers at Lowe's probably have some different sizes of plastic collars. It may be possible to drill and tap a hole for a set screw, in an appropriate plastic collar, if that would make it easier to fasten collar and disc together.

BebuLamar

dustie wrote:

I'll make a guess there is no threaded end on the shaft.

A collar with a set screw locker? ......if you can find a way to attach the disc to the collar.
The specialty fastener drawers at Lowe's probably have some different sizes of plastic collars. It may be possible to drill and tap a hole for a set screw, in an appropriate plastic collar, if that would make it easier to fasten collar and disc together.

Yes the shaft is not threaded. It does have a flat spot that you can use a set screw.

dustie Loc: Nose to the grindstone

BebuLamar wrote:

Yes the shaft is not threaded. It does have a flat spot that you can use a set screw.

How much force will be applied against the disc when it's in use?

BebuLamar

dustie wrote:

How much force will be applied against the disc when it's in use?

just to spin the disk so it's not much force. I would accelerate it slowly so there won't be a lot of force involved. I would draw a line on the disk and spin it at certain speed (the motor I have can be made to spin at very accurate speed) and take a picture and see the motion blur to figure out the shutter speed of the digital camera.

Longshadow Loc: Audubon, PA, United States

dustie wrote:

I'll make a guess there is no threaded end on the shaft.

A collar with a set screw locker? ......if you can find a way to attach the disc to the collar.
The specialty fastener drawers at Lowe's probably have some different sizes of plastic collars. It may be possible to drill and tap a hole for a set screw, in an appropriate plastic collar, if that would make it easier to fasten collar and disc together.

dustie Loc: Nose to the grindstone

BebuLamar wrote:

just to spin the disk so it's not much force. I would accelerate it slowly so there won't be a lot of force involved. I would draw a line on the disk and spin it at certain speed (the motor I have can be made to spin at very accurate speed) and take a picture and see the motion blur to figure out the shutter speed of the digital camera.

A suitable adhesive may be able to attach a collar to the disc for that, providing you can come up with materials that are compatible with the adhesive formula.

Bultaco Loc: Aiken, SC

BebuLamar wrote:

I have a small motor which has a 0.2" diameter shaft. I want to attach a disk about 5-6"in diameter. The disk would in plastic. What is an in expensive way to do this?

.2 is a odd size, are you sure that it's not MM shaft?

BebuLamar

Bultaco wrote:

.2 is a odd size, are you sure that it's not MM shaft?

Yes it's 5mm.

alexol

If you have access to making the parts (or maybe there's something available on McMaster - there usually is) you could consider locking the wheel in place with a sleeve either side, each sleeve having a locking grub screw. The sleeves (or flanges) would be mounted such that the grub screws are 180° from each other.

sippyjug104 Loc: Missouri

If I were doing it, I would use two-part epoxy.

alexol

As long as the shaft isn't too smooth and there wasn't too much friction acting against the wheel causing acceleration between shaft and wheel, epoxy would probably work.

An entire 20 seconds of research went into finding these... https://www.mcmaster.com/products/retainers/shaft-collars-2~/system-of-measurement~metric/shaft-diameter~5-mm/

or something similar to these: https://www.mcmaster.com/products/retaining-rings/push-on-retaining-caps-6/

kenJN

buy a disk attachment for a power sander or drill. Ace Hdw is the place.

Warhorse Loc: SE Michigan

kenJN wrote:

buy a disk attachment for a power sander or drill. Ace Hdw is the place.

BebuLamar

Thanks all. Attachment for power sander or drill wouldn't work because the sander or drill has a chuck. This motor only has a shaft.