Do you think max X dimension from LR3 Calculator + an extra 1.25" is enough? If not I can widen the overall total width.
Or… are you speaking of the proposed width of the “riding plates” (for lack of a better term)?
The XZ plates are different thickness. My Aluminum ones are 1/4" and the printed ones are wider. That changes the calcs. The calcs show where plate thickness matters.
I ran the calc with the thicker width for printed XZ plates, just to make sure the table calc was maxed.
Make sure it fits with the thinner ones as well, and that shifts the cutting surface as well. That is what Dan was pointing out.
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Yes, my thinking was to have enough of a “riding plate” (for lack of a better term) on both the inside edge and the outside etc, to accommodate either thickness of XZ plate, with a little room to spare.
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I’m using both the LR3 calculator and some visual reinforcement based on the illustration of LR3 dimensions, slightly modified for 49" cut width (for MDF that’s 49 x 97). Here’s what I am headed for, in general, as something that can accommodate both printed XZ plates and 1/4" metal XZ plates:
LR3 gantry placement, X-axis Tube length, etc. re. MDF for cuttable area
THE IMAGE BELOW IS FOR TABLES WITH WOOD SIDE RAILS
(see below for image for metal strut side rails)
Based on complying with the design constraints and dimensions, the 2D illustration below shows roughly what the X-rib profile should look like.
THE IMAGE BELOW IS FOR TABLES WITH METAL STRUT SIDE RAILS
(see above for image for wood side rails)
Based on complying with the design constraints and dimensions, the 2D illustration below shows roughly what the X-rib profile should look like.
Given the choice between these two placements of the central Y-spars, which is better from a standpoint of support and rigidity?
#2 I suppose
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OK, got it. I’ve learned so much about Fusion 360 and use of its params, and so much about how to go at creating parameter driven things, as well as getting a better handle on the needed dimensions, that I may do it over, now that I can do it better.
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After that, once you build one, there will be things that need changing. Then you might want to include some test parts for the offsets…Some people are going to want space for vertical mounting as well.
It’s funny how complicated a table can be, when a sheet of plywood on the floor does the job just fine. I have been thinking about ideal tables for eight years now. The part I have not tackled yet is adjustable height on a LR, I do on the MPCNC.
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Hey can you explain just a bit more on this aspect?
Like this.
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Rabbit hole! LOL
I have a vertical clamping surface on my table. I haven’t used it with the cnc yet (still). But I do use it as a work bench. It is very handy. Mine doesn’t do all those angles. Just 90*
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Has anyone found the gaps between the spoilboard and the Riding Plate™ useful? I understand having the two separate so the spoilboard can be swapped out, and there’s a limit to how close the bit can get to the edges to surface, but does the gap help with debris on the riding plate at all or provide other advantages?
I ask because I like the idea of a continuous surface but my LR2 design also has the gap and I’m wondering if I should keep it on the upgrade.
And this design clearly has the gap 
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Have fun! Frank makes some cool stuff.
@DougJoseph I released a version of my idea, Parametric Table. Not sure if that CAD will help you or not.
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Checking it out with excitement.
Ryan recently commented elsewhere that aluminum rectangle tubing can be considered as an option. He is designing for a wide audience based on using wood for availability and affordability, so he’s designing for use of wood.
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Re. Ryan has now released a plan for a parametric table that can also be CNC cut. I took many cues from both his napkin sketch and the table he released today. Here are a couple of overhead screen shots for comparison:
Ryan’s table…
Compared to my table.
I will complete outputting mine, but since Ryan’s is available, I will not be offended if his is used instead of mine!