I’ve now been using your table for a bit and it works great. The only part that was a bit tricky to get right was the joint between the two components of each of the riding plates, it was never quite perfect. I’ve since found out that where I live, plywood comes in the standard 4’x8’ sheets, but MDF actually comes quite bigger at 275cmx183cm. So I was thinking that I could just build the riding plates in a single piece. However, when thinking about that, I thought: why not just build a torsion box of that size (probably a bit smaller in X)? Is there any important advantages to having the riding plates separate from the main body? I can’t think of any use for the holes in between since the ribs are in the way anyway. Only use I can think of is having a quick way to determine effective cutting area, but that can be worked out otherwise. But I thought I’d ask before committing to something this big.
The only advantage I’m aware of is it makes it possible to make a table larger than existing material width. If you can get materials that are wider then that’s great.
I used osb flooring for mine.
I saw @bitingmidge mention porting this to onshape early on. Did anyone end up doing that?
Juat wondering, Has anyone updated a table for V4?
The table didn’t change in general, you just have to adjust the values to fit the 4.
@vicious1 produced a nice table - I don’t know if it’s available as an onshape document- I suspect not, hopefully someone can provide a link!
I almost did it last week.
I intend to recreate it in Onshape in the next week or two.
Will rebuild my table likely when I go to the LR4
I should have. Not happy with what i have right now, but hey!
This is almost exactly what I was thinking of doing eventually. Here’s a link to the inspiration
my apologies, I was replying to a post from Dreyfus on this design. I didn’t realize it was at 6 months old!
I was asking because I thought the table came with designs that had the holes for all the mounts in the file so cnc could cut them.
Wishful thinking I guess. If the table had that, then making the LR4 sqaure would be a no brainier because it would bolt into the table holes.
If your CNC wasn’t square before, you’d have the holes crooked as well. So it doesn’t really help. 
Nah, the parametric table would be bigger than my table, I’d get the parametric pieces cut at a shop so it’s perfect.
The parametric tables were designed with bootstrapping in mind. Lay a sheet of mdf on the ground and use it as a “spoilboard” then put another sheet on top and use your LR to cut its own table. There are a few threads around for that very thing. As long as you go through the process to square up the Lr correctly your parts will come out great and you could go in and add the holes for where everything needs to screw down. Then as long as you took your time and built the table really square then in theory your machine should be square when you place it. But it would still need to be checked afterwords and pull off amounts adjusted to get it as close as possible
You could remix/ modify one of the parametric designs to get what you’re describing here.
If you are not comfortable with editing a design, if you illustrate what you’re wanting, one of us may well do a modification for you.
There are alway tradeoffs, as Ryan says.
The only parts of the table that need to be longer than what you can cut from a stock 4’x8’ sheet are the “riding plate” parts on each side, and one could glue together two pieces of MDF to make those from shorter pieces. Another approach is to use the metal struts (brand names available include Unistrut and Superstrut), and attach to the sides of the torsion box. But then you have to drill and tap holes for where to attach the Y rail clips. The latter approach is what I did. I think another approach is to find, for example, MDF strips that are longer than 8’ — possibly named as some other product.
The bootstrap approach by using the floor at first, can definitely work. One additional note beyond what @Jonathjon wrote above, is the MDF sheets on the floor need to be more than just one full sheet. A full sheet would need strips on each side for the LowRider to ride on, so it could have a cuttable area covering the full sheet in the middle.
With the Help of @Michael_Melancon I got Ryan’s Parametric table drawn up in Onshape now. And from what I can tell the variables are all working great.
Also @vicious1 helped me get the front and back offset closer to what is needed for the LR4, but that can still be adjusted to suit your preference.
Woah, Johnnyboy, very nice. 
Thanks a lot.
Don’t thank me. I just copied Ryan’s CAD. And Mike helped me with some variables I couldn’t get right lol
whoaaaaa!!! Onshape allows me to see your design without logging in!!! Very Cool!
Nice!!!