Suggestions to pack round DC motor so bracket holds

This topic has 24 replies, 13 voices, and was last updated 3 December 2019 at 15:49 by Michael Gilligan.

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2 December 2019 at 17:36 #439864
Chris TickTock
Participant
@christicktock
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
Advert

2 December 2019 at 17:36 #9963
Chris TickTock
Participant
@christicktock
2 December 2019 at 17:46 #439867
Emgee
Participant
@emgee
You could use 3 or 4 (120 or 90 degrees) packing pieces between the 2 diameters, wood should be OK for small motor,

Emgee
2 December 2019 at 18:03 #439873
bill ellis
Participant
@billellis45274
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.
2 December 2019 at 18:19 #439876
Mike Poole
Participant
@mikepoole82104
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
2 December 2019 at 18:59 #439886
Nimble
Participant
@nimble
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
2 December 2019 at 19:26 #439889
Chris TickTock
Participant
@christicktock
Thanks Guys some really good ideas. Not sure what insertion rubber is but will find out.

Regards

Chris
2 December 2019 at 19:27 #439890
Brian Oldford
Participant
@brianoldford70365
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
2 December 2019 at 19:54 #439895
peak4
Participant
@peak4
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
2 December 2019 at 20:20 #439903
Chris TickTock
Participant
@christicktock
Posted by Brian Oldford on 02/12/2019 19:27:29:

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

Hi Brian, yes it is certainly possible, I have just looked up what amalgamating means which I have understood to mean it bonds to itself to form one. Now that's fine but it would have to grip the body once the clamp was tightened. I suspect it would work. I am minded to use neoprene eithing from a sheet or washers as this material should stay consistent as it is often used for gaskits.

Chris
2 December 2019 at 20:38 #439904
Grindstone Cowboy
Participant
@grindstonecowboy
+1 for the wood idea. A very handy source is coffee stirrers from your local coffee shop.
2 December 2019 at 21:27 #439914
Michael Briggs
Participant
@michaelbriggs82422
+1 Emgee, I like simple effective solutions.
2 December 2019 at 21:35 #439915
Chris TickTock
Participant
@christicktock
Posted by Michael Briggs on 02/12/2019 21:27:42:

+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
2 December 2019 at 21:43 #439919
Paul Kemp
Participant
@paulkemp46892
Posted by Chris TickTock on 02/12/2019 21:35:12:

Posted by Michael Briggs on 02/12/2019 21:27:42:

+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.
2 December 2019 at 21:49 #439922
Chris TickTock
Participant
@christicktock
Posted by Paul Kemp on 02/12/2019 21:43:12:

Posted by Chris TickTock on 02/12/2019 21:35:12:

Posted by Michael Briggs on 02/12/2019 21:27:42:

+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).

Point taken that a rigid mount is important. However once clamped up neoprene I think would also be firm. There also exists if I use wood an increased risk of causing damage to the motor body as the load will be concentrated on the few points that the wood is positioned.. I agree I am being speculative but will try the neoprene first and the wood as my fall back position.

Thanks for all posts…appreciated

Chris

Paul.
2 December 2019 at 22:42 #439924
Ian P
Participant
@ianp
Posted by Chris TickTock on 02/12/2019 21:35:12:

Posted by Michael Briggs on 02/12/2019 21:27:42:

+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

Using natural resources is better for the environment.

IanP
2 December 2019 at 22:47 #439925
Ian P
Participant
@ianp
Posted by Chris TickTock on 02/12/2019 21:49:55:

Posted by Paul Kemp on 02/12/2019 21:43:12:

Posted by Chris TickTock on 02/12/2019 21:35:12:

Point taken that a rigid mount is important. However once clamped up neoprene I think would also be firm. There also exists if I use wood an increased risk of causing damage to the motor body as the load will be concentrated on the few points that the wood is positioned.. I agree I am being speculative but will try the neoprene first and the wood as my fall back position.

Thanks for all posts…appreciated

Chris

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
3 December 2019 at 09:45 #439963
not done it yet
Participant
@notdoneityet
I think a better solution would be to make a proper bracket/holder to suit the motor and application. Rather than bodging something.
3 December 2019 at 10:06 #439967
Michael Gilligan
Participant
@michaelgilligan61133
Posted by not done it yet on 03/12/2019 09:45:30:

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.
3 December 2019 at 10:20 #439969
Ian P
Participant
@ianp
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
3 December 2019 at 10:28 #439973
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Ian P on 03/12/2019 10:20:52:

I have nothing whatsoever against bushings if they are fit for purpose,

.

Ian, [for clarity]

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

MichaelG.
3 December 2019 at 10:58 #439979
Mike Poole
Participant
@mikepoole82104
The OP suggests resilient mount so I suspect it is not a direct tooling spindle.

Mike
3 December 2019 at 11:01 #439981
Ian P
Participant
@ianp
I know (knew) your answer referred to NDIY's comment but TBH his suggestion of a making a proper mount makes perfect sense to me.

From previous posts of Chriss TT I deduce that he is very particular in doing everything correctly and by the book!

Ian P
3 December 2019 at 11:08 #439983
not done it yet
Participant
@notdoneityet
Posted by Michael Gilligan on 03/12/2019 10:28:35:

Posted by Ian P on 03/12/2019 10:20:52:

I have nothing whatsoever against bushings if they are fit for purpose,

.

Ian, [for clarity]

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

MichaelG.

I think Ian responded quite adequately.
3 December 2019 at 15:49 #440034
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Ian P on 03/12/2019 11:01:57:

I know (knew) your answer referred to NDIY's comment but TBH his suggestion of a making a proper mount makes perfect sense to me.

From previous posts of Chriss TT I deduce that he is very particular in doing everything correctly and by the book!

Ian P

.

Chris also has a Sherline Lathe and mill, so making a custom mount for a 75mm diameter motor is likely to be quite an onerous task for him.

He also states that he has a cylindrical motor and a cylindrical clamp [albeit not yet illustrated], which is a little oversize … A situation which is crying-out for a simple split bushing, I would say.

… and I’m sure that’s in ‘the book’.

I have no further comment.

MichaelG.

Edited By Michael Gilligan on 03/12/2019 15:52:20
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