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Post details of your rolling stock developments - locomotive, carriages, DMUs, etc.

Re: SD70M - Powered

Postby Slarge » Mon Jan 13, 2014 7:32 am

Also the gear is mounted in the bogie and will twist (in relation to the worm) when on a corner so the width of the gear becomes an important factor.
The space between teeth will need to accommodate the diagonal measurement of the teeth width at the angle on the curve. If they can't the worm will effectively force the spur gear downward.
Hope that makes a bit of sense?! In theory the worm should be raised a fraction making for a looser tollerence.
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Re: SD70M - Powered

Postby ConnorL » Mon Jan 13, 2014 2:40 pm

Is this better? The wormgear had been moved up 0.1mm.

Is the spacing between the middle gear and the wormgear better? Remember the wormgear have 0.05mm spacing between the bogie and itself.

Image
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Re: SD70M - Powered

Postby GarrattHamster » Tue Jan 14, 2014 11:46 pm

To me that look's a lot better.
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Re: SD70M - Powered

Postby Slarge » Wed Jan 15, 2014 10:09 am

Tollerence looks good, should allow for all manner of movement.
Are you using solidworks? (if so you could animate it before printing)
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Re: SD70M - Powered

Postby ConnorL » Thu Jan 16, 2014 12:20 am

I was using Solidworks till it expired about 2 weeks ago, I'm using Autodesk Inventor right now. I used the assembly to see if there's plenty of space and...I think there is. I'm going to order these tomorrow with TTX Intermodal double stack well cars.
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Re: SD70M - Powered

Postby ConnorL » Sat Feb 22, 2014 1:57 am

Sorry, no updates so far...

Currently experimenting home-made brass etching.

This is my first attempt, I did it too quickly.

Image
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Re: SD70M - Powered

Postby robertshrives » Thu Feb 27, 2014 8:58 pm

Hi great progress - looking to use the chassis on British Co - Co models so hope you get it all working well- you will have then sold three to me !
Thanks
Robert
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Re: SD70M - Powered

Postby ConnorL » Tue Mar 11, 2014 12:11 am

A small update. Brass etching was successful.

I ran into a problem... The brass sheet was not 100% brass in the middle making the etching take a long time and uneven etching.

Still first brass etch attempted ever in my entire life. I will be buying thinner and 100% pure brass.
Image
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Re: SD70M - Powered

Postby robertshrives » Tue Apr 01, 2014 9:22 am

Hi , great etchings - must be very small !! How goes the chassis?
Robert
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Re: SD70M - Powered

Postby ConnorL » Sat Apr 12, 2014 1:39 am

Hello,

Sorry for late reply, it went well.

I will keep on trying again, to make the brass etching smoother and more sharp instead of wavy as seen.

It fits well on the chassis, I'm nearly done! Just few more tweaking...then I can start focusing on the electronics.

Image

I will be making more brass handrails this weekend.
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