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Toto's Traversers
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 Posted: 6 May 2017 09:30
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paul_l
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Now this thread will be a slow burner, especially over the next few weeks, however as a teaser here goes.

As many may have noticed Toto's Luib Bridge layout is progressing, and he has promised it to the Elgin Exhibition as a work in progress, and part of that progress involves a fiddle yard (or two), and guess who has been tasked with that job :whatever:.

These will be the standard 54" x 21" size board Toto has settled on, and be double ended, so can be used on many layouts even as a through fiddle yard.
They will be traversers with a 48" tray with a 3" lead in at each end.
Board alignment will be by pattern makers dowels, and will make a jig to allow the dowels to be correctly fitted to multiple boards.

http://www.stationroadbaseboards.co.uk/cart_dowels.htm

The traversers will be motorised using Nema 17  stepper motor and Arduino based controller, positions being controlled via DCC - in a similar vein to Viccy Road.

Putting some the lessons learned from Viccy Road in to action, we will be using 8mm Lead screws now readily available from Ebay etc

http://www.ebay.co.uk/itm/T8-500mm-Lead-Screw-Rod-w-Nut-Shaft-Coupling-Mounting-Support-for-3D-Printer-/152529432301?hash=item2383766eed:g:o-UAAOSwt0FZBFCc

And heavy duty drawer runners as slides.

The tray will be able to go beyond the front and rear edges of the boards to allow for greater movement, but will need to be within the 21" board for transport.

Better motor mounts and belt tensioner

So that's the brief.

Prototype for the motor mount - to see if I'm up to making it.







This was based on a drawing on line to see if I could get the accuracy - the final design will have webs either side of the motor, but happy with the result so far.

Paul

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 Posted: 6 May 2017 09:37
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ed
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Son(s) of Frank, gone but not forgotten :mutley2:


Ed

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 Posted: 6 May 2017 09:38
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Ron
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Looking good Paul, that 3D printer shaft etc.. looks really handy, does it mean less work to build??:scratchchin:



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 Posted: 6 May 2017 09:45
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Toto
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Sounds about right. I'll have baseboard number 4 ready asap. I think it shall be an open frame board as discussed to give some deviation in the landscape and break away from the flat. Also some kind of scenic break to disguise the traversers at either end. 
not much to do then. :avatar:
cheers for now ....... must crack on.
toto



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 Posted: 6 May 2017 09:47
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paul_l
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Don't know about time - I was tucked up in my bed, while it beavered away.

Just did a quick calculation, the test print roughly two 55x55x5 pieces weighed in at 19.5 grams, lets be generous and call it 20g, used approx 24p worth of plastic - think I can afford a few more test pieces :mutley2:.

The big time saver will be once I have the pieces finalised, I just print up enough to make two.

And some of the bits may find there way on to Viccy road.

Paul

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 Posted: 6 May 2017 10:41
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Keith M
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Ron wrote:
Paul, that 3D printer shaft etc.. looks really handy

Just what I was thinking, Ron. That's got my mind wondering what I could do on the layout with a bit of kit like that!
Keith.



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 Posted: 6 May 2017 12:06
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paul_l
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Anyone who's used CAD and 3D modelling software would find these easy to use, for me like Toto my 3D modelling normally requires, hammer, chisel, files and saws :mutley2:, ludite I know, so the learning curve has been a bit steep, but I'm starting to get into the mind set.

But quickly becoming a weapon of choice, especially with the different choices of materials, PLA (Brittle, Hard, but susceptible to heat), ABS, PLE, Wood filler based materials, Carbon Fibre, Nylon etc, etc. I'm still on my first 1Kg reel of PLA that came with the printer.

Have as look at   

http://thingiverse.com/  

to get an idea of what you can do - and they're free to download and use, just read the users terms and conditions - majority is not for comercial use, and let them see your finished print.

back to the chores

Paul

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 Posted: 6 May 2017 20:19
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paul_l
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Version two ready to print

Settings used extruder temp 200c, no bed heating, layer height 0.2mm, Infill 15% with 3 surface layers

The print isn't solid But actually 15% (the infill setting), to achieve this the slicer software MakerWare in my case generates a honey comb pattern to infill.



and just keeps building the layers up



And the two versions side by side



And with the Nema 17 motor fitted - this motor is a 0.4A version





It took 2h17m to print, and used 29g of material.

Paul

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 Posted: 6 May 2017 20:58
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Toto
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Certainly looks the part Paul. :tophat:



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 Posted: 7 May 2017 00:49
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gormo
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Woohoo!!!!,

You`re taking us forward into new areas Paul and what great results ..:thumbsup::thumbsup::thumbsup::thumbsup::thumbsup:

http://www.click:tophat:Gormo



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 Posted: 7 May 2017 03:09
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Kimbo
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Neat work Paul, what's next? A loco body?:thumbs:



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 Posted: 7 May 2017 07:29
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paul_l
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I reckon the lower half of the boiler for the Lima O gauge 4F could be up soon, then maybe the wagon tippler for the Gas works :scratchchin:

But the flounder will be on my back if I procrastinate too much :avatar:

Paul

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 Posted: 7 May 2017 10:24
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Toto
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Exactly. ........ Now back to work.:avatar:



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 Posted: 8 May 2017 06:14
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paul_l
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This may be of interest to our antipodean members

https://youtu.be/77rGwN9PQ9I

and it seems to work even though its upside down  :mutley2:

May be too late of course - and not available in the UK, but if enough people badger them you never know.

Paul

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 Posted: 22 May 2017 21:12
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paul_l
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Two goody bags arrived from China or was it Hong Kong, never mind - here's a piccy of one.



2 x 8mm smooth rails and support brackets (two per rail)
4 x 8mm ID linear bearing blocks
1 x 8mm lead screw (giving approx 7 to 8 mm movt per rev) and T nut
2 x Pillow block mounted bearings (22x8x7)
2 x flexible couplings (5mm dia for the motor - 8mm for the lead screw.

Rails and lead screw are all 500mm long.

Each set will form the basis of the traverser mechanicals, for these traversers I'm using rails rather than drawer slides. With the popularity of 3D printers, these parts are becoming quite cheap the above lot inc postage was less than 25.

Now just have to start the builds.

Control system will be as the Viccy Road traverser - Sparkfun Big Easy Driver for the stepper controller, and an Arduino Nano for the controller.

Paul

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