Thanks, this is actually my second machine. The first is a Rockcliff model D that I built with basic power tools, clamps and glue; it works well, this is my first attempt at something bigger and faster.
I used the first machine to cut the pieces, which were designed in a very basic cad program (CadStd) and translated to G-Code with Cut-2d. The center pipe is pvc, it is actually used more for lining everything up and holding it in place while assembling the rails, it will also make a good conduit for running power and limit switch wires. I could replace it with metal pipe as well, and I might if I think it will help with the rigidity, but for now I think the 2 pieces of 1/2" pipe is doing a good job.
My next challenged is to complete the lead nuts and couplers. I think I have a good start on the lead nuts, I will either be using some nylon spacers, or some 1.5" acetal round stock that I will tap with a 1/2-10 ACME tap... I found that making a jig using a cnc machine allows very accurate placement of the needed holes in the spacers/round stock. Finding parts to build the couplers with is causing a bit of a headache, any suggestions would be appreciated, I am going from the 1/4" motor shafts to 1/2"-10 acme screws, I was looking to use a few tubes like this:
http://buildyourcnc.com/diycoupling.aspx, but I am having trouble finding a supply of aluminum tube of the right diameters.
Time is not really the enemy here, the longer this takes the more likely it is that I will be able to buy new electronics rather then strip them off the first machine... of course this goes against the natural urge to get it finished and running NOW
Oh well time to do do the real job so I can afford to this in the first place...<*sigh*>
-GrumpyGeek