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                                       progress report - chairs in the output
     
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1st message | this message only posted: 16 Jul 2018 19:34
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from:
Martin Wynne
West Of The Severn, United Kingdom



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As I mentioned, the reports of folks using 3D printing to create bullhead chairs has spurred me to move chairing in Templot from the NOD* list to the to-do list. :)

I started some experimental work a couple of years ago, and I have now returned to it.

It seemed that if the output was to be of any use in 3D printing, the chair outlines would need to have the proper corner radii. It's a lot of extra calculation with 4 chairs on most crossing timbers, but it hasn't impacted too much on the screen response for full track plans. Obviously you would switch the chairs on only for the final printed templates, they are not needed while track planning.

It's fiendishly complex. For example the REA bridge chairs (L1) have a larger corner radius (1.3/4") than ordinary S1 chairs (which have 1" corner radius): 



And GWR slide chairs have a full semi-circular end on the inside, for example.

Templot does all the positioning and rotating of the chairs, and calculates where bridge chairs are needed to fit the space.

For 3D printing it needs to be in the DXF file. So this is where I've got to:



Just the chair bases so far. The next job is to change the rails to a proper bullhead section. Then add the keys, and the chair jaws. And the chair screws.

There is a lot still to do. I may be gone for some time. :)

Just to be clear, the above wasn't drawn in a CAD program, it is the DXF export from Templot. The CAD program is used simply to view it, and then save it as an STL file for 3D printing. All the dimensions and fits will be entered in Templot. No CAD knowledge will be needed -- at least, that's the plan.

This is in Templot2. When I have got it finished and working I will make the code open-source, but I will probably leave it to others to incorporate it into OpenTemplot.

*Nice One Day

cheers,

Martin.

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2nd message | this message only posted: 16 Jul 2018 19:48
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from:
Rob Manchester
Manchester



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Hi Martin,

Nice work with the chairing :)

If it isn't too much to ask can you add some code to aggregate all the chairs used on templates in the storage box ( like the timber/sleeper length one which is great ). It would need to be broken down into quantities of S1, L1 types etc. This would make ordering/stock checking a breeze. I am looking at the 'old fashioned' route of using injection moulded chairs and actually glueing them on.......

Rob


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3rd message | this message only posted: 16 Jul 2018 22:59
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from:
d827kelly
Coventry, United Kingdom

 

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A great addition to templot!
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4th message | this message only posted: 17 Jul 2018 07:12
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richard_t
Nr. Spalding, South Holland, United Kingdom



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I've been doing similar, in 2D, using my cad program - I think I'd go slightly crazy doing a full plan, even though the chairs are blocks so they just need putting in the correct place.



Attached is a simple A6 turnout, without the crossing chairs - it's a PDF, as the PNG I generated looked awful.




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Attachment: a6-chairs-test-Model.pdf (Downloaded 58 times)
 
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5th message | this message only posted: 17 Jul 2018 17:31
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from:
Andrew Barrowman
USA

 

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richard_t wrote: I've been doing similar, in 2D, using my cad program - I think I'd go slightly crazy doing a full plan, even though the chairs are blocks so they just need putting in the correct place.



Attached is a simple A6 turnout, without the crossing chairs - it's a PDF, as the PNG I generated looked awful.



Hi Richard,

Did you draw it all in CAD or did you import a DXF from Templot?

Andy

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6th message | this message only posted: 17 Jul 2018 17:38
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from:
richard_t
Nr. Spalding, South Holland, United Kingdom



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Everything bar the chair outlines is from Templot. I'm not that loopy (yet) :-)
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7th message | this message only posted: 18 Jul 2018 04:35
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from:
Andrew Barrowman
USA

 

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richard_t wrote: Everything bar the chair outlines is from Templot. I'm not that loopy (yet) :-)Correct answer! You get ten points (points, not turnouts :) )

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8th message | this message only posted: 30 Jul 2018 16:14
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
Rob Manchester wrote: Nice work with the chairing :)

If it isn't too much to ask can you add some code to aggregate all the chairs used on templates in the storage box ( like the timber/sleeper length one which is great ). It would need to be broken down into quantities of S1, L1 types etc. This would make ordering/stock checking a breeze.
Thanks Rob.

Yes, that's on my list. Also splitting the timbering into separate counts for sleepers and turnout timbers.

I'm making some progress, as discussed on the 3D printing topic. Chairing works for equalized timbers or square-on, and the chairs remain on the rails when timbers are shoved*:




For 3D printing, the chairs go into the exported DXF files:




As you can see, there is a long way still to go. The chair jaws and keys to add, and then all the special switch and crossing chairs.




Of course this level of detail won't survive 3D printing in 4mm scale, but it might in 7mm, and should do in the larger scales. The screw heads are all at random angles.

The bright colours in the screenshots are simply to make the details more visible.

*not when crabbed.

cheers,

Martin.

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9th message | this message only posted: 30 Jul 2018 16:34
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from:
Rob Manchester
Manchester



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Martin Wynne wrote:

I'm making some progress, as discussed on the 3D printing topic. Chairing works for equalized timbers or square-on, and the chairs remain on the rails when timbers are shoved:

cheers,

Martin.
Hi Martin,

Thanks.

Yes you are making great progress, interesting to watch the the development of this even if much is way over my head :(

Rob

PS...Ha Ha, Surely you need to take the chair screws out of the chairs before you can shove the timbers otherwise the rail will get slewed over? :D

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10th message | this message only posted: 30 Jul 2018 17:01
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
Thanks Rob.

The 3D printing stuff is going over my head too. I'm still writing DXF code the same way I did in the 1980s. :)

That's why I started this separate topic to cover the track design aspects.

Here is something that will be possible. If you omit a timber when shoving, its chairs go too, as you can see. However, if instead you set its length to zero, making it invisible, its chairs remain unsupported on the rails. Adjacent long timbers can then be extended under them:



With the timbers invisible, shoving them along will be a way to slide the chairs along the rails to any desired position.




UPDATE:

We now have the keys, and outer jaws on the S1 chairs. Gold-plated: :)



Notice the random key positions (and screw heads).

There should be a corner radius around the top of the jaw, but I think I'm going to draw a line at this. I've used as much of the REA drawing as seems reasonable. I'm hoping that the 3D printer will smooth out some of the sharp angles:



Now for the inner jaws, L1 chairs, slide chairs, slab & brackets ...

Don't hold your breath.

cheers,

Martin.

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