Threadless Ballscrew in Motion
by captnspiff, published
Use This Project
Give a Shout Out
If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.Print Thing Tag
Just another 'threadless ballscrew' 3D-printed... What I really wanted to figure out is this: How much slip does this ballscrew accumulates when travelling over the smooth rods, moving around back and forth a couple times...? Is it suitable for an open-loop design, or do you need position sensors for feedback..? Backlash is very low, which is nice.
The essential geometry of the tilted bearings was done in OpenScad, nice and customizable. The roller bearings push flat on the shaft surface. The script is a remix from: http://www.thingiverse.com/thing:124706/#files
Thanks for that one!
The part from OpenScad was then further edited in tinkercad to add fastening screws, double sides, and more details: https://tinkercad.com/things/73GGA5MH9z7
3D-printed and CNC-machined at FabLab Zurich:
See the parts moving: https://vimeo.com/76689145
This is still work in progress... But as for now: I got the final position after the test run in the video pretty accurate ~0.1mm (sorry, you can't check the scale), but if a disturbing force is applied during the movement, the ballscrew slips and things gets out of track very quickly. At the moment, I do not see a chance for open-loop control to function reliable. Has anyone else gone this way with success? I am very interested if anyone else could share test results of their builds!
- Add springs to the fasterner screws
- Clean up OpenScad script
- Build this part from aluminium?
- Smooth Rod 8mm, choose hardened steel if possible
- 6x Roller Bearing 625, 16mm outer diameter
- 6x M5 Screws 20mm, and nuts for Bearings
- 6x Flat washers M5
- 2x M5 Screws 25mm for fastener
- 4x M4 Screws and nuts for mounting to the base plate
Upgrade this Thing with Thingiverse AppsCustomization
Edit, personalize, or revise this ThingPrint Fulfilment
Order a print of this ThingTools and Utilities
Repair, slice, or enhance this Thing
Threadless Ballscrew in Motion by captnspiff is licensed under the Creative Commons - Attribution - Share Alike license.
What does this mean?
- You must attribute (give credit) to the creator of this Thing.
- You must distribute Remixes under the same license as the original.
- Remixing or Changing this Thing is allowed.
- Commercial use is allowed.
Show Some Love
Say thanks by giving captnspiff a tip and help them continue to share amazing Things with the Thingiverse community.Tip Designer
We're sure captnspiff would love to see what you've printed. Please document your print and share a Make with the community.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. It’s even easier to post a Make via the Thingiverse Mobile app (available via Google Play and Apple App Store).