Coupler height

User avatar
ConducTTor
Site Admin
Posts: 8828
Joined: Sat May 23, 2009 4:52 pm
Location: Atlanta GA USA
Contact:

Re: Coupler height

Post by ConducTTor »

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

:)
My website: https://www.ttnut.com
It's the website you're already on. But if you want to be even more on it, click the link.

User avatar
Rob M
Posts: 614
Joined: Mon Jan 30, 2012 12:35 pm
Location: Northern Wisconsin

Re: Coupler height

Post by Rob M »

:smile:

areibel
Posts: 1799
Joined: Fri Jun 12, 2009 10:12 am
Location: Cambridge Springs PA

Re: Coupler height

Post by areibel »

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!

User avatar
ConducTTor
Site Admin
Posts: 8828
Joined: Sat May 23, 2009 4:52 pm
Location: Atlanta GA USA
Contact:

Re: Coupler height

Post by ConducTTor »

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.
My website: https://www.ttnut.com
It's the website you're already on. But if you want to be even more on it, click the link.

User avatar
ConducTTor
Site Admin
Posts: 8828
Joined: Sat May 23, 2009 4:52 pm
Location: Atlanta GA USA
Contact:

Re: Coupler height

Post by ConducTTor »

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

0.3mm is tiny.
My website: https://www.ttnut.com
It's the website you're already on. But if you want to be even more on it, click the link.

User avatar
Rob M
Posts: 614
Joined: Mon Jan 30, 2012 12:35 pm
Location: Northern Wisconsin

Re: Coupler height

Post by Rob M »

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.

User avatar
ConducTTor
Site Admin
Posts: 8828
Joined: Sat May 23, 2009 4:52 pm
Location: Atlanta GA USA
Contact:

Re: Coupler height

Post by ConducTTor »

I think it's a really good thing to bring up. We (ALL of us) aught to follow the same specs when designing.
My website: https://www.ttnut.com
It's the website you're already on. But if you want to be even more on it, click the link.

User avatar
Rob M
Posts: 614
Joined: Mon Jan 30, 2012 12:35 pm
Location: Northern Wisconsin

Re: Coupler height

Post by Rob M »

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.

Image

User avatar
Rob M
Posts: 614
Joined: Mon Jan 30, 2012 12:35 pm
Location: Northern Wisconsin

Re: Coupler height

Post by Rob M »

Image

User avatar
ConducTTor
Site Admin
Posts: 8828
Joined: Sat May 23, 2009 4:52 pm
Location: Atlanta GA USA
Contact:

Coupler height

Post by ConducTTor »

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


Sent using Tapatalk
My website: https://www.ttnut.com
It's the website you're already on. But if you want to be even more on it, click the link.

Post Reply

Return to “General Discussion”