Module Standards Questions

Module Standards Questions

Postby railtwister » Sun Nov 29, 2009 1:23 pm

Some questions regarding the listed module standards:

1. Am I correct in assuming the 24" width for a straight module is a maximum and not a minimum, since the backdrops are noted to be required to be within this dimension, and any modules wider than 24" (even if by a fraction of an inch) would cause problems when using the 180 degree curve modules or even two 90 degree curve modules back-to-back? In other words, can someone build a narrower than 24" wide module and still be considered to be in conformance?

2. The corner module drawing doesn't show track radii, is this to be extrapolated from the minimum radius and the set back dimensions indicated in the straight module drawing? This would mean that the minimum radius is actually the specified inside curve radius, at least on corners. Are larger radii considered, and if so, would larger footprint corners be usable?

3. Assuming the corner modules are intended to be outside corners and not inside ones, wouldn't the backdrop requirement stated for corners, whether 90 degree or 180 degree be satisfied by the adjoining straight modules? Unless the inner corner of a 90 degree curve module were truncated, making it an irregular pentagon or hexagon (if it was also truncated on the outermost corner) instead of a square, where does a required backdrop for a corner or end module fit onto the module?

Thanks,
Bill
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Re: Module Standards Questions

Postby CSD » Sun Nov 29, 2009 3:03 pm

Well, Bill, here we go.

1) The 2' width and length are, for the time being, the minimum sizes. We determined the track set back from the front of this size module, however; the best way to think about it is that the backs of the modules need to be flush, so the track distance from the back remains constant. This lets you make the module as deep as you like. For length, you can make it as long as you like. So long as you supply the matching staging module behind it. 2' is the minimum, however.

2) The track radii on the corner modules are 353mm and 396mm. These are based on the standard sizes available from the major TT track manufacturers. The use of larger radii and modules is fine if it still joins to the other units.

3) I don't think you need one for the corners. Truthfully I'm not building one so I haven't paid attention to that bit of it. What you say makes sense though.

Here is an concept drawing done awhile ago to illustrate. Keep in mind that this drawing may differ from the standard as it is developmental.
Module Planning 5.jpg
Mark
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Re: Module Standards Questions

Postby BTTB Fan » Sun Nov 29, 2009 4:08 pm

It may be a good idea to modify the standard to provide track offset from the BACK of the module. This should prevent any ambiguity with respect to the minimum width and backdrop situation.
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Re: Module Standards Questions

Postby railtwister » Sun Nov 29, 2009 4:30 pm

So if the minimum depth is 24", what happens when someone shows up with a 30" deep module and you are using two 180 degree corners based on doubling the two foot square 90 degree corners. If the extra 6" dimension is on the front of the module, it won't be too big of a problem. If it extends to the rear, then it's a problem. Or, even if you use 4 of the 24" square 90 degree corners, won't you need at least two 6" fillers to get everything to fit? This is one of the problems faced by the "dreaded donut" style layouts, they must be carefully co-ordinated as to number of modules and module size for each setup. If someone new shows up at the last minute, or if someone can't attend a setup leaving an odd number of modules available, it can be a problem.

Bill
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Re: Module Standards Questions

Postby CSD » Sun Nov 29, 2009 4:46 pm

railtwister wrote:So if the minimum depth is 24", what happens when someone shows up with a 30" deep module and you are using two 180 degree corners based on doubling the two foot square 90 degree corners. If the extra 6" dimension is on the front of the module, it won't be too big of a problem. If it extends to the rear, then it's a problem. Or, even if you use 4 of the 24" square 90 degree corners, won't you need at least two 6" fillers to get everything to fit? This is one of the problems faced by the "dreaded donut" style layouts, they must be carefully co-ordinated as to number of modules and module size for each setup. If someone new shows up at the last minute, or if someone can't attend a setup leaving an odd number of modules available, it can be a problem.

Bill


I see what you're getting at. The limitation is that the extension can not be in the back. That would screw things up exactly as you mentioned. The odd number of modules problem is avoided with the matching staging area. The biggest coordination issue is that we have all the corners needed for the circle. Although, even if we didn't it could be set up as a point to point.
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