Prototype chassis for the GP38-2

Re: Prototype chassis for the GP38-2

Postby DKRickman » Tue Apr 01, 2014 11:53 am

I've tried to make little tiny pieces like that before. I am stunned, and in awe of your skills. If I wore jewelry, I would definitely wear those!

A question: Are you making the center ring out of something like aluminum, so that the solder won't bond with it? I can't tell from the photos if all the parts are in brass.
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Re: Prototype chassis for the GP38-2

Postby areibel » Tue Apr 01, 2014 10:02 pm

Jeez, it looks like you could put scale driveshafts under some TT vehicles with those?
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Re: Prototype chassis for the GP38-2

Postby DKRickman » Tue Apr 15, 2014 10:28 am

That drive is looking great, Bernd. One comment, though. I thought I'd read somewhere that both U-joints on a drive shaft need to be aligned in order to work without vibration. As I recall, the claim is that when properly aligned, they work together as a CV joint, but when out of alignment they do not. I was researching automotive drive shafts at the time, but it seems to me that you have a miniature version of one there.
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Re: Prototype chassis for the GP38-2

Postby Rob M » Tue Apr 15, 2014 11:53 am

U-joints should always be "in-phase" to reduce the possibility of vibration. Constant velocity joints are automatically in-phase due to their construction.

Great little page about drivelines:
http://www.machineservice.com/technical-101/vibrational-issues/

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Re: Prototype chassis for the GP38-2

Postby CN-TT » Wed May 07, 2014 9:31 am

Hello Bernd,
have you ever considered a more simple drive shaft like this (http://www.modellbahn-service-oschatz.d ... Plast.html) This is used in some older TT locos. The shafts that fits in the ends are flat. I think, it works very good. resources/image/1672
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Re: Prototype chassis for the GP38-2

Postby scaro » Wed May 07, 2014 11:09 am

thanks for the photo, bernd, it does look very interesting. good looking shell with with a chassis in it. the way ahead.
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Re: Prototype chassis for the GP38-2

Postby ConducTTor » Thu May 22, 2014 8:43 pm

Where in that pic are the Shay u-joints?
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Re: Prototype chassis for the GP38-2

Postby ConducTTor » Thu May 22, 2014 10:11 pm

Oh wow that's TINY.
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Re: Prototype chassis for the GP38-2

Postby Shipsure » Sun May 25, 2014 4:20 pm

I'm just going to throw this out, but you may have already considered this...are you looking at some of the Micro RC Helo drives? Ive seen some pretty tiny U Joints/Ball Joints that may do the trick.

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Re: Prototype chassis for the GP38-2

Postby Shipsure » Mon May 26, 2014 2:06 am

I''ll look into it tomorrow.

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