I had the basic initial design done over a year ago, but have made a few changes since then, and due to a variety of reasons it took me over a year to get the bits and pieces pulled together and assembled
.As stated in the title this is a ShapOko inspired design as I used the Shapoko (V1 at that point) as the starting point and also tried to incorporate many of the tweaks and modifications shown here on the forum (thanks to everyone for sharing!). While there are very few parts that are the same as the ShapeOko (mostly makerslide, v-wheels, etc), most of the design ideas have been seen here before (eShapeOko, V2, etc).
So here it is as designed:
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Mechancial:
- Used two 1800mm pieces of makerslide cut into 635mm for X-axis (double x), 765mm for the Y axis, and three 255mm long z axis pieces four three "quick change spindles"
- This gives soft limit travel of x=18.75", y=23.875" and z=3.375"
- Used an extruded aluminum base with the waste board on top - similar to V2 but it used extrusions parallel to the y axis makreslide to tie the front and rear extrusions together into a box and added two cross brases in the middle
- Added an extra extrusion between the double x which is bolted to the front x-axis makerslide
- Three pieces of extrusion spaced between the x axis motor mount plates -- one of which mounts the x axis drag chain
- Stub of extrusion to mount the y axis drag chain
- Bent stainless steel for y axis support / dust guard - bolted to the y axis makerslide and extrusion base
- Motor mount plates are of 1/4" aluminum with my own set of hole patterns (all 4 plates are the same)
- Hole pattern in motor mounts allow for larger distance between z-axis v-wheels (ala eShapeOko)
- End plate mounts and belt tensioners are 1/4" aluminum
- Z axis bearing mount is c'bored piece of 3/8" thick aluminum to fit a 1/4" id bearing
- Lead screw is 3/8-8 2 start ACME thread with the end turned down to 1/4" to fit through the bearing, then tapped for a 1/4" nut, then turned down again to fit the 5mm coupling
- The purchased ACME nut (made of delrin) is threaded (and then set-screwed) into a block of aluminum which is then bolted through the motor mount plate and into the tapped x axis extrusion spacers
- GT2 3mm pitch belting, and 18 tooth pulleys
- Belt on the outside design for both x and y
- Porter Cable Trim router #7310 (because I already owned it
) - All aluminum spacers for motors (and z axis v-wheels) with a 13mm OD except z axis (8mm OD)
- Motor mounts and other plates were made by a machinist friend in his spare time (Part of the reason it took so long is he got really busy this summer)
- Nema 23 motors for x and y (two motors on y axis)
- Limit switchs in both directions on all axis (including z axis which was a bit of a trick)
- Individual TB6560 stepper motor drivers (qty:5 - one for future) withbreakout board
- LinuxCNC
- E-stop (from ebay) tied into breakout board
- Spindle relay (from ebay) tied into breakout board (to automatically turn on and off spindle)
- Spindle switch have the option to always have the "spindle" on (in case I want to try a 3D printer or laser etc and just need power on all the time at the spindle)
- 24V 15A power supply (from ebay)
- All the CNC electronics are housed in the same computer case as the computer running LinuxCNC - It got a bit cramped to work on in places but it fit
- LED lamp to show when power is on to the CNC
. Despite that it seems to work very well. Pictures below for your enjoyment.