HEY - This thing is NO GOOD!
Check out the updated design!
4/27/17- Made another compatible gearbox for this (66.46 : 1)
2/12/17 - added holes in top half of joint to access screws easily.
2/13/17 - added flat spot to top half of joint for better bed adhesion
3/4/16- Designed a EZ Print Version
Where's Everything Else???
In This Collection you will find:
- All other related parts for this project
- Future Updates to this Project
- All User Submitted Remix's
- Click that watch button to get notifications on future uploads!
for use with this joint are different "thing's" located in the robot collection above
These gearbox is absolutely necessary for this joint because it not only drives the joint but it also works off the concept of Emmets "Gear Bearing" and provides a bearing for the hinge joint, use the "one piece sun gear" and the "4 Module planet gears". Also, print the #2(or #4) sun gear and use that in the 4th module.
Running the gearbox without it pressed into the arm is a good way to wear it in so it doesn't rob torque from your stepper, but it can also take the the planet gears out of alignment if the rings open up and skip a gear. if the gears aren't arranged as pictured above the gearbox will wear itself out rather quickly.
Bendy Bend Bend:
This arm rotates 230 degrees before colliding with itself in the cad program but it is actually more like 229 degrees real life.
I designed the gearbox with an optional 4th ring and longer planet gears to accommodate that, if you would like to use that setup (you should) you will also need to print out the Optional Side Bearing.STL file. The Side Bearing holder is pressed in place and secured with 1.75 filament though the hole. This setup should give the joint more support against side to side play and should also reduce backlash.
There I also a mount to attach a second NEMA 17 motor, so you can drive the gearbox from both ends, it is attached with a press fit and held in place with 1.75 filament pressed through the holes. This setup also significantly reduces backlash and side to side play as the gearbox actually uses the stepper motor shaft as a support, thus supporting the joint.
Other Important Info:
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- Make a "make" and show everyone what you made! (make? :0) Everyone will thank you for it!
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Gear Down For What?
I printed this on my Anet A8
You need to print these parts so the rings are flat on the build plate, it is so much stronger that way, i attempted printing it upright and the ring cracked while inserting the gears.
i had trouble with the rings getting messy until i set support top distance to 0