Prototype chassis for the GP38-2

Re: Prototype chassis for the GP38-2

Postby LVG1 » Fri Apr 10, 2015 8:45 am

gerhard_k wrote:But there's a limit to that - trying to run a motor at too small a fraction of its designed speed will often give poor low-speed performance and response, which you need for satisfactory switching.

That's true.

I only wanted to add a simple alternative to the DCC idea...
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Re: Prototype chassis for the GP38-2

Postby Rob M » Mon Apr 13, 2015 8:22 pm

:thumbup:
If it is rigid enough you can just add weight if that's your concern. I'm sure .030" would be easier (quicker) to machine than .125"

What are the overall dimensions of that motor? I ordered one but who knows when it will get here.
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Re: Prototype chassis for the GP38-2

Postby Rob M » Mon Apr 13, 2015 8:56 pm

Thanks.
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Re: Prototype chassis for the GP38-2

Postby Richard-B » Tue Apr 14, 2015 10:52 am

Bernd wrote:Got my test chassis finished. Now I can test motors and different drive trains.
Image

This is -exactly- the same direction I was heading... the K.I.S.S. approach (Keep It Simple S---).

If a "standardized" diagram of the plate dimensions is created, almost anyone can fabricate this using anything from hand tools to a CNC mill!
The key dimensions/criteria are:
  • The outside shape and dimensions to fit the GP38-2 shell...
  • The trucks center-to-center dimension
  • The cut-out shape for the MTB trucks, allowing for the gear tower and the truck rotation
  • Any adjustment / adaption for height
  • Provision for a coupler mounting pad
I think this results in an easily-replicable, lower-cost approach than using a more complex commercial power chassis.
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