Suggestions to pack round DC motor so bracket holds

Hi I have a small 3mm ish gap between my 75 mm Dia DC motor and the 77 Dia mm bracket I have to hold it. There will be some torque but not too heavy duty. Obviously I wish to pack out the motor so when I tighten the metal clamp it holds the motor without turning when used.

I am thinking of some type of rubber tape or self adhesive tape but thought I would see if any one has any ideas.

Regards

Chris

You could use 3 or 4 (120 or 90 degrees) packing pieces between the 2 diameters, wood should be OK for small motor,

Emgee

A bit of old rubber matting or cushion flooring would be my choice, I'd steer clear of anything metal. Just ensure any cooling ducts are not blocked.

A piece of inner tube could do the job but they are getting rare with even motorcycles using tubeless tyres, could be worth a cheeky visit to your favourite tyre fitting place.

Mike

Hi Chris,

A possibility would be to use insertion rubber, available in a number of widths and thicknesses and available in nitrile and neoprenr which should prevent stickiness developing if there is any stray oil about.

Neil

Thanks Guys some really good ideas. Not sure what insertion rubber is but will find out.

Regards

Chris

Would it be possible to wind a number of layers of self-amalgamating rubber tape around the motor body making sure you don't obstruct any ventilation holes?

Edited By Brian Oldford on 02/12/2019 19:27:40

Go-cart tyres are a useful source of rubber; competition dry track ones being slicks give a nice even surface and the belting internally provides useful reinforcement.

Bill

Edited By peak4 on 02/12/2019 20:24:05

+1 for the wood idea. A very handy source is coffee stirrers from your local coffee shop.

+1 Emgee, I like simple effective solutions.

Can anyone advocating the use of wood here give a reason why it might be better than for instance neoprene?

chris

Assuming this is for your grinder 'project' it's probably a good idea to have the motor (thus the wheel) mounted rigidly in relation to the rest / what you are trying to grind (or lap).

Paul.

Using natural resources is better for the environment.

IanP

If the motor has a cylindrical body and no other mounting features than presumably the manufacturer will have designed the outer casing to withstand being clamped or held so no need to take any special precautions.

Ian P

I think a better solution would be to make a proper bracket/holder to suit the motor and application. Rather than bodging something.

.

What have you got against a simple bushing ?

Engineers have been using them since Noah was a lad.

MichaelG.

I have nothing whatsoever against bushings if they are fit for purpose, although I would not describe go-cart tyres, inner tube rubber, amalgamating tape, Neoprene insertion ('insulation'?) rubber or strips of wood as being simple in the context of a holding the motor and therefore spindle of a grinding tool accurately located.

Maybe I have the wrong end of the stick and the motor being clamped carries a pulley for a belt drive so a resilient mount might be very appropriate.

Ian P

.

Ian, [for clarity]

My question was specifically a response to ‘not done it yet’

MichaelG.