Saturday, April 20, 2013

rev:Alpha Meter, Meter Panel Eater

Ok, stupid title but sometimes thou gotta let one out.

Anyway, here  rev:Alpha of my ShapeOko upgrade on GitHub.


In general I think I have met all my design goals. The only compromise was the over all size. At one time I did experiment with what overall size it would take just to load in a 24"x24" panel. The savings did not justify the effort of trimming down the extrusion nor the wood. Leaving the extrusion  at 1 meter and foot print 48"x48", the cutting area is about 40"x31".
So size was a compromise but I have room for it and I think this space will be worth it. Unlike other things in my garage this will "pay rent".  I may have to do some spring cleaning and  "evict" some junk to find this a home.

X-Rail and Gantry Improvements

X Gantry Box like design
Because of the noticeable give in my current ShapeOkos gantry I really wanted to solidify the X rail and carriage. I scanned the forums and extracted what I thought was the best ideas for doing so.  The upgrade are:

Double X-rails witwlanfox Blocks  - It was pretty much a consensus that a Double-X rail would be needed for the meter span. I also thought that the wlanfox Blocks  were an excellent idea and be made of 3/4" plywood. I will use M5 threaded rod and nylock nuts to span the distance of the blocks. I think using nylock nuts all around is a good idea as I have had some nuts loosen and fall off  in the middle of a job. Also 4 more V-Wheel Kits are needed.
Gantry Underside

Standard Wheel Carriage Plate - Using these instead of the existing motor plate lowers the X-Rail so that the resulting moment arm is reduced. Forces in the Y direction should have less twisting effect on the Gantry and X-Rail assembly. The draw back of this mod is that the Y motors have to be relocated.  You can see in the overview picture that they will be mounted on a fabricated item I call the Motor-Buttress assembly (blue).  This will require longer timing belts and two additional Smooth Idler Wheel Kits.
Standard Wheel Carrage Plate

 Part Fabrication

Idler Butress Assembly
I will use the ShapeOko to cutout the parts to make the Idler and Motor Buttress Assemblies as well as the wlanfox Blocks. I'm hopeful that I get it right before I tear down the ShapeOko for upgrading. If not then I will have to resort to my skills with hand tools which will be a big time suck and an exercise of patience but we will getr done.

No comments: