General Category > General Discussion

Numatic NVD 750

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Bryan Milham:
If one brush is worn and the other not, I would suggest that the spring clip that holds the unworn won in place was not properly engaged, hence not supplying enough pressure onto the motor commutator.

julcle:
As Brian says it will be a problem with the brush, it's probably sticking in the brush guide. it's a good idea when changing them to clean the brass guides out and just run the new brushes over a bit of sand paper so that they slide up and down smoothly with no restriction.
Best of luck --  Julian

Wood spinner:
You could try a brush from the working motor to see if it runs OK the get some new brushes

jonas:
Update.

I was very much mistaken when I said that only one brush had worn down. When I eventually got them out I found all 4 were almost down to the limit. I had been struggling to remove the old brushes when I realized that they came as a complete module, holder spring & brush, all preset. This made the replacement simple once I had found the modules on line, total cost £10.
 I have just had a quick run & it appears to be O.K. but time will tell.

The main reason for this update is to thank you chaps for your advice, but also to point out that the brushes in this machine do not have a long life. I have  had this machine for just over 3 years & am only a hobby turner. I would advise any one who has had one of these machines for a few years to check the brush gear, as worn out brushes can cause serious damage. I think I was lucky.

Just for reference, a new brush is 28mm long.

Jonas 

Wood spinner:
Also even if you don't need brushes now it's good insurance to buy some spares NOW
I have been caught out several times and been told " Sorry no longer made " rendering a machine useless

The last one about to go for scrap is a miter saw  :(

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