fitting new brushplates to hornby motors

[bill sykes]

I have 3 brush plates I want to fit to  a Margate R842 black 5 tender. Are there any wrinkles anyone can give me ?

[Howbi]

"Are there any wrinkles anyone can give me ?"

Hi Bill.......my domestic management says she's got some spare wrinkles you can have f.o.c........... 😳..........HB

[96RAF]

I'm not sure what you,mean by brush plate...

Is it motor related or wheel pickup related or HBM's missus related.

Rob

[Howbi]

I believe it is part no X929 being referred to, Brush retainer...........HB

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[Fishmanoz]

You're spoiling all the fun HB, you've put the whole argument firmly back on track when it could have gone the way of far more interesting wrinkles here on the wrinklies' forum.

[bill sykes]

Now the children have had their fun can I get back to the question ? The parts are not shown on the HSS that¬s why I don¬t know what to call them, they are the copper segments the carbon brushes run on. I have plenty of wrinkles some you can see some you can`t

[james_nelmes]

 Bill

I have seen some of these come up on ebay occaisionally but they are difficult to solder the microscopically thin wires onto.

If your existing plates are badly worn or corroded, there is someone on ebay who does an exchange armature, fully refurbished for around £10 incl p&p and sends it once you have sent the old armature back. Search for "Ringfield Armature"

Unless you have fried the windings, the R803 armature cleans up very nicely. I use a nylon pen to clean the dirt off and then a cotton bud with iso-propyl alcohol. Sometimes continuity between the plates is lost and I have found this is often the solder connection on the plate itself. If you can identify the poor connection (there will be continuity between plates which do have a connection, a little touch with a soldering iron often restores the connection.

[Ruffnut Thorston]

The technical term for these would be....

 

Commutator Segments? 😉

 

The whole "motor core" would be the Armature Assembly...including motor shaft and commutator....X.803 on the above Service Sheet...

[96RAF]

Just referring back to item X803 on that service sheet, are you saying you want to replace the commutator,plate as a whole or do you have three sector plates that you want to fit.

 

Either way will require soldering to fine varnished windings and if you end up with a wire a bit short then losing one turn from a coil to get more wire to work with won't upset the motor at all. Scraping the wire ends with a knife will clean off the varnish, then its a case of twisting adjacent coil wires together and resoldering the each sector in turn.

 

I think the plate just presses onto the shaft with a plastic bush, but what you must watch is the angle of the plate relative to the coils as this sets the timing of the motor. Get it wrong and the motor will not run at all or will run out of tune and with no power.

 

If you intend to replace the copper plates individually then I expect they are epoxied to the paxolin backplate Then proceed as above.

I hope this helps, from someone who used to resign slot car motors in a previous life. Rewinding with less turns of heavier wire gives you more revs and power but using more amps and producing more heat. More winds of thinner wire makes for a less 'cammy' motor to use a petrol engine term.

Rob 

[bill sykes]

Thanks for the answers, I think I`ll try the refurbished route