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GWR 105

707 Views 4 Replies 3 Participants Last post by  FredPluto, 
F
I have sorted the bad contact problem,

But three hours later I am still trying to get the wheels to run smooth the aligniment is a major problem

I get em set up and the back wheels tick tock, any help appreciated
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Ozzie21
Sounds like you have the rear wheels out of quarter. You should remove the crank pin screws from the rear wheels and rotate the rear wheels till the balance weights on the rear wheels are in the same position as the the other pair of wheels assuming you dont move the other wheels sets.

Charles Emerson
Queensland
Australia

QUOTE (Pluto @ 30 Dec 2008, 05:12) <{POST_SNAPBACK}>I have sorted the bad contact problem,

But three hours later I am still trying to get the wheels to run smooth the aligniment is a major problem

I get em set up and the back wheels tick tock, any help appreciated
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F
Many Thanks Ozzie,

I have got it running reasonably now, it was the offset angle between the LH RH drive pins on the drive wheels that was wrong.

I have guesstimated it at 120 degrees offset, but if anyone can provide a proper angle it would be appreciated.

It is the GWR 0-4-0 by the way

Regards Pluto

QUOTE Sounds like you have the rear wheels out of quarter. You should remove the crank pin screws from the rear wheels and rotate the rear wheels till the balance weights on the rear wheels are in the same position as the the other pair of wheels assuming you dont move the other wheels sets.
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The proper angle for the outside cranks is 90 degrees on any 2 or 4 cylinder simple loco. It is also the most tolerant in terms of required precision of assembly which is why manufacturers also use it for three-cylinder loco models for which 120 degrees would be appropriate. Now whether it should be LH or RH lead, that I don't know...
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Many Thanks for your helpful answers, It is now set to 90 degrees and is purring along nicely
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