| Author | Message | ||
     David Howard Unregistered guest Posted From: 82.110.149.93 |
Sirs,Rolls Royce Shadow SRH14936 I need some new brushes and their tensioning springs for my electric window motors ,round permenant magnet,cog drive, not listed by Royce or Lucas can anybody help? P.S I am in the U.K. (Message approved by david_gore) | ||
| David Gore Moderator Username: david_gore Post Number: 698 Registered: 4-2003 |
Hi David, Suitable carbon brushes should be available from your local electric motor rewinder if your auto electrician cannot help. You can use the following listing of carbon brush suppliers for a wider search: http://dmoz.org/Business/Electronics_and_Electrical/Electromechanical/Electric_Motors/Components/ The following UK specialist may also be able to help: http://www.hdvince.ltd.uk/ Please publish the details of the brushes when you get them to help future users why may need them. When I have had this problem in the past, I have usually resorted to grinding down the nearest size brush I could obtain from an auto electrician or motor rewinder. Regards David | ||
| bob uk Unregistered guest Posted From: brig-cache-4.server.ntli.net |
In the past I have brought Lucas Dynamo brushes which are quite big and cut them down to fit other stuff such as vacuum cleaners and power tools. Brushes are made off a similar stuff to pencil lead ( graphite really )and are very easy to reshape using a junior hacksaw and a bit of sand paper on a flat surface. I have found that making the brushes 0.005 inches smaller than the housing is about right. For round ones I machine them in a lathe. I noticed in Myth-busters that they turn down lumps of graphite for rocket nozzles but I am unsure that this is the same grade, however if mythbusters can get that grade then I should think that the correct grade would be available. The springs could be hard to get. However there will be a spring loading figure somewhere which can be checked with a small spring balance like fishermen use. So you can tweak them by bending them and checking. I have found that this is not critical and a good guess will be OK. Enough tension so that the brushes stay put but not so much that the brushes quick wear. Rule of thumb is that the motor should spin easy with or with out brushes (Message approved by david_gore) |
