Coupler height

Re: Coupler height

Postby ConducTTor » Sun May 13, 2012 9:29 pm

Both of our math is off. But if we put it together it's perfect! 2mm * 1/10mm = 0.2mm = 0.008 inches.

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Re: Coupler height

Postby Rob M » Sun May 13, 2012 9:32 pm

:smile:
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Re: Coupler height

Postby areibel » Sun May 13, 2012 9:34 pm

That'll be the trick- getting the height right with different wheelsets. Luckily the Boss can design for it, anything "modern" with 36" wheels might need a little filing down of the bolster height to get it perfect but that's not huge.
It looks like the HP trucks are off the most, but shimming the coupler pockets down will get things back in order. I can't really fault them, considering Hal Joyce started stamping them out probably 10 years before the RP's were adopted!
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Re: Coupler height

Postby ConducTTor » Sun May 13, 2012 9:42 pm

I think the easiest thing to do is design for 36" wheels - if 33" are used then it would just require a 0.0125 inch (0.3mm) washer between trucks and truck mounts.
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Re: Coupler height

Postby ConducTTor » Sun May 13, 2012 9:43 pm

Although now that I think about it - is anyone really going to notice a 0.0125"/0.3mm height difference?

0.3mm is tiny.
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Re: Coupler height

Postby Rob M » Sun May 13, 2012 10:03 pm

Yep that's only about 3 sheets of paper size-wise.

My main reason for this thread was to know the exact numbers to aim for and then if it's off a little either way I will still be within tolerance. I'll make up a drawing that represents this incase anyone else needs it.
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Re: Coupler height

Postby ConducTTor » Sun May 13, 2012 10:11 pm

I think it's a really good thing to bring up. We (ALL of us) aught to follow the same specs when designing.
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Re: Coupler height

Postby Rob M » Sun May 13, 2012 11:33 pm

Ok, this is for the Micro-Train couplers with 33" wheels. The truck height is on the left and the needed bolster height is on the right. If anyone is able to measure any other brands of trucks let me know the size and I can add them.

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Re: Coupler height

Postby Rob M » Sun May 13, 2012 11:54 pm

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Coupler height

Postby ConducTTor » Mon May 14, 2012 12:24 am

Rob, I'll adjust my trucks to the NMRA standard. I'll use 36" wheels as a reference.


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