Mini servo gripper Plate
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Published on March 18, 2011
This thing was Featured on December 16, 2011
Derived from
Mini servo gripper
by jjshortcut
Description
Plates for a 3dprinter of thingiverse.com/thing:2415 . They are done in openscad and require the original files from the Mini servo gripper.
There are currently two plates: one for geared parts, another for the rest of the parts. This is so you can print the gears at better quality and to avoid possible ooze making them not fit properly.
The original versions are just a plate directly made from the original files. There is also gripper_plate_v2 which contains tweaks for 3d printing. Namely it merges both 4mm tall arms into a single 8mm tall one and the base is modified to fit an HXT900 servo and merges both servo plates. This decreases the parts needed and helps
simplify assembly.
A video of it in action: youtube.com/watch?v=-3I8lXD45wI
Files:
- gripper_plate.scad: Openscad code for the original plate.
- gripper_plate_gears.scad: Openscad code for the gear plate.
- gripper_plate.stl: Rendered model of the original plate.
- gripper_plate_gears.stl: Rendered model of the gear plate.
- gripper_plate_v2.scad: Openscad code for the modified plate.
- gripper_plate_v2.stl: Rendered model of the modified plate.
- Gripperservoplate_v2.stl: The new servo holder part (in gripper_plate_v2).
Total weight assembled with Natural PLA: 53 grams (including servos and screws).
There are currently two plates: one for geared parts, another for the rest of the parts. This is so you can print the gears at better quality and to avoid possible ooze making them not fit properly.
The original versions are just a plate directly made from the original files. There is also gripper_plate_v2 which contains tweaks for 3d printing. Namely it merges both 4mm tall arms into a single 8mm tall one and the base is modified to fit an HXT900 servo and merges both servo plates. This decreases the parts needed and helps
simplify assembly.
A video of it in action: youtube.com/watch?v=-3I8lXD45wI
Files:
- gripper_plate.scad: Openscad code for the original plate.
- gripper_plate_gears.scad: Openscad code for the gear plate.
- gripper_plate.stl: Rendered model of the original plate.
- gripper_plate_gears.stl: Rendered model of the gear plate.
- gripper_plate_v2.scad: Openscad code for the modified plate.
- gripper_plate_v2.stl: Rendered model of the modified plate.
- Gripperservoplate_v2.stl: The new servo holder part (in gripper_plate_v2).
Total weight assembled with Natural PLA: 53 grams (including servos and screws).
Instructions
Print gripper_plate_v2 and gripper_plate_gears then assemble.
I'd recommend filing the gears and adjusting them with a cutter so they fit properly. It's pretty important so the friction and forces don't break the servos which is pretty easy to do (broke one already, luckily had spare gears).
I'd recommend filing the gears and adjusting them with a cutter so they fit properly. It's pretty important so the friction and forces don't break the servos which is pretty easy to do (broke one already, luckily had spare gears).
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Batist
on
March 20, 2011
said:
Nice! Do you have a video of it working? I'm a littlebit concerned about the friction... no problems with that?
bobbens
on
March 20, 2011
said:
Printed in natural PLA you do have to cut out and file out the gears a bit for it to work well. Already damaged a motor's gears by having it not filed down. While the teeth are currently pretty good, they are a bit hard to print OK. I still have to finish remounting it OK since I've gone through a few variations, will try to do a video later.
So yes, friction is an issue and you have to "postprocess" the gears until it "goes away".
License
Mini servo gripper Plate by bobbens is licensed under the Attribution - Non-Commercial - Creative Commons license.
I got mine working! The gears needed a medium amount of post processing, but it wasn't anything a file couldn't fix. I elongated the gripper arms, and that exaggerated the problem that there is enough play that the arms won't be fully parallel. I may try to strategically shrink the connectors to compensate. As to hardware, I used M2.5 by 25mm bolts and nylon washers.