Topic: Solidoodle Dual Y Motor Drive
It is done, finally got my new setup to print! Results are great
STL files here:
http://www.thingiverse.com/thing:1914991
1) New -- Eliminated Y rods/belt transmission completely - removed all previous parts and replaced with a new Nema motor - to to this I created a drilling jig and a matching NEMA motor support to help position the mounting holes. The original motor was reverted 180 degrees.
Also
2) Replaced all MXL belts, pulley and idlers with GT2 (16 tooth pulley count for added precision - change steps per mm from 88 to 100 using Repetier direct Eprom configuration)
3) Replaced X and Y rods with chrome hardened steel -- Way smoother and stronger than stock.
4) Replaced X/Y carriage with Lawsy's carriage derived design but modified to:
- Be unibody (to avoid potential rod misalignment during assembly (and reduce the need for screws).
- Be compatible with Solidoodle 4 stock extruder mount (3 holes on the aluminum bracket).
- Add micro switch support
- instead of snap fit, I made the linear bearings mount from the sides into a half cylinder to avoid potential loosening that could produce yaw movement. I had this happen in my Prusa I3 Graber after many prints and found this design to be a lot more resilient.
5) Mounted bed Y front stabilizer - [add link to design]
BTW... I liked the direct Y motor drive idea but that would not allow me to keep the nice Soliddodle 4 covers on (since the single drive motor has to sit outside of the case) so I decided to create this solution. The 2 motor design is based on many Rep-Rap's Z drives and and the X and Y drives used in the MPCNC design
Printing a perfect cylinder:
Drilling jig sitting behind the original Rod (that will be later removed). This picture is rotated -- YOU ARE LOOKING AT THE RIGHT SIDE -- (I will fix it soon) . Also the bracket drawn on the metal with a sharpie is to approximate the original pulley position.
Wiring - Note the reversal of one of the coils wiring pairs to accommodate for the second motor. A good explanation with great pictures and a diagram on this technique can be found here: http://www.vicious1.com/assembly/wiring-the-steppers/
Left side motor.
Right side detail now showing the SD4 "filter" fan re-positioned. To do this you will need a special drill. This filter is probably useless anyway so I believe that is totally optional. You may leave that fan out.
Left side detail. Note that I had to put a very small bumper (in black) attached to the side of the Y carriage to activate the Y micro switch before it hits the NEMA mount. It is only about 3mm thick.
Finally, here is the detail of Lawsy's carriage redesigned as unibody. Printing is a bit ugly as I did it on .320 mil layer height and 90% infill. Supports are essential for the top overhangs of the cylinder since I printed it horizontally to reduce potential flex in the Y direction.
- Alted's MPCNC - 24" X 24" plate - Arduino Mega/Ramps 1.4 - DeWalt 660, TFT28 display
- Solidoodle 4 - with Y axis Dual Motor Drive (own design), Lawsy carriage remix, chrome hardened smooth rods, bed stabilizer, GT2 belts
http://www.thingiverse.com/3dEz/about