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I recently replaced the weak mangent on my old (but otherwise perfect) 'Lyme Regis'. The motor pulled like, well, a train, but a bizarre problem ensued: the new magnet is so strong that it lifts the trailing bogie clean off the tracks! Short of bodging with gaffer tape and carboard I couldn't think of a way round this. I gave up and put the old magnet back on. Any suggestions? And any views on the damage done to these ring-shaped magnets by removing from motor frame?
 

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In depth idiot
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What's the ferromagnetic component in the trailing truck? That's what you need to replace. If it is the axle, then brass rod is a good substitute.
 

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Just another modeller
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QUOTE (Mike H. @ 28 Nov 2008, 02:13) <{POST_SNAPBACK}>I recently replaced the weak mangent on my old (but otherwise perfect) 'Lyme Regis'. The motor pulled like, well, a train, but a bizarre problem ensued: the new magnet is so strong that it lifts the trailing bogie clean off the tracks! Short of bodging with gaffer tape and carboard I couldn't think of a way round this. I gave up and put the old magnet back on. Any suggestions? And any views on the damage done to these ring-shaped magnets by removing from motor frame?

*** Re the problem, replacement of the wheelset with an equivalent using a plastic axle may do it. Ask the Dublo or Wrenn societies - they may have an answer as replacing ferrite with Neo is a common action. If the Neo is the same size as the original Ferrite I'm not surprised - it only needs to be about 1/2 the size.

Re the original magnets, it removed and keeper plates not applied, it may well have lost even more power, and may need remagnetising. Running the loco is the best way to see - if power is lost the loco will seem to be OK with no load on it but will have lost power to pull as hard.

Richard
 
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