TT Nut GE U30B

Re: TT Nut GE U30B

Postby ConducTTor » Sat Jan 19, 2013 12:20 am

Getting there....the gear mesh needs to be loosened a bit. Meanwhile, some pics for you. The basic design is as follows:

* Shapeways plastic skeleton that holds all the pieces together.

* Upper brass weight

* lower brass weight / bogie pivot

* motor

* trucks

The truck design is what I call a "gearbox/sleeve" affair. The two inside pieces are ABS and hold the gears in place (these are the crucial pieces that Rob M has been SO AWESOME in helping me with). When fit together, they slide into a shapeways plastic sleeve. The sleeve serves several purposes: It holds the gearbox together, it attaches to the chassis, it's used as a mount for the electro wipers, it's used as an attachment point for the truck bottoms and side frames.

As I've mentioned before, the whole things weighs about the same as a Tillig BR 218 even though it's actually smaller in size when you take into account the narrow hood (I'm super proud of this).

So there you go. The major bits of the design revealed.

u1.jpg


u2.jpg


u3.jpg
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Re: TT Nut GE U30B

Postby Rob M » Sat Jan 19, 2013 2:46 am

Looking great :thumbup:

ConducTTor wrote:...the gear mesh needs to be loosened a bit

Let me know if you want to try making some more with any changes. I recently starting using the anti-backlash feature in cnc program and am getting much better precision. If possible, send me an R12 version dxf file (I have an old cad program). I think converting from a sketchup file to dxf loses some accuracy.
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Re: TT Nut GE U30B

Postby scaro » Sat Jan 19, 2013 5:52 am

brilliant. is getting the wipers to engage any kind of problem? i've got some wheels on order so i can fiddle around with widening the spectrum SD45 to TT, and that's one thing that worries me.
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Re: TT Nut GE U30B

Postby richardedmonds » Sat Jan 19, 2013 6:27 am

Now that does look impressive, and I might add very professional as as well, super piece of collaborated manufacturing - lol big words for me
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Re: TT Nut GE U30B

Postby ConducTTor » Sat Jan 19, 2013 12:48 pm

Rob M wrote:Looking great :thumbup:

ConducTTor wrote:...the gear mesh needs to be loosened a bit

Let me know if you want to try making some more with any changes. I recently starting using the anti-backlash feature in cnc program and am getting much better precision. If possible, send me an R12 version dxf file (I have an old cad program). I think converting from a sketchup file to dxf loses some accuracy.


Will def let you know after I make the changes. Unfortunately the design is done on sketchup so the conversion has to be made - unless you can work off a CATIA file (I can redo the whole thing in CATIA).
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Re: TT Nut GE U30B

Postby ConducTTor » Sat Jan 19, 2013 12:49 pm

scaro wrote:brilliant. is getting the wipers to engage any kind of problem? i've got some wheels on order so i can fiddle around with widening the spectrum SD45 to TT, and that's one thing that worries me.


No issue with the wipers whatsoever.
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Re: TT Nut GE U30B

Postby LVG1 » Sat Jan 19, 2013 12:59 pm

Rob M wrote:I think converting from a sketchup file to dxf loses some accuracy.


Are you sure?
As I understood dxf is an object-oriented graphics format. So why should there be a loss of accuracy? Isn't that illogical?
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Re: TT Nut GE U30B

Postby Rob M » Sat Jan 19, 2013 1:01 pm

No problem. I will be sure to double check the hole locations before machining it.
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Re: TT Nut GE U30B

Postby Rob M » Sat Jan 19, 2013 1:22 pm

LVG1 wrote:
Rob M wrote:I think converting from a sketchup file to dxf loses some accuracy.


Are you sure?
As I understood dxf is an object-oriented graphics format. So why should there be a loss of accuracy? Isn't that illogical?


True but I don't know how accurate the conversion add-on is. I have noticed if I make two circles with the same center location in sketchup and export a dxf, when I open the dxf the centers are not the same.It may have been a fluke though.

Or it could have been after the part had been rotated a few times in sketchup. There is some precision lost when rotating a matrix, depending on how far from the center of rotation the vertices are.
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Re: TT Nut GE U30B

Postby LVG1 » Sat Jan 19, 2013 1:34 pm

So the problem is in sketchup before the graphic is exported to dxf.
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