- Joined
- Aug 22, 2012
- Messages
- 4,147
I'm trying to make a clutch/friction drive for the slo-mo control on my telescope.
I've fabricated a proof of concept to see if it would work and it does with a very smooth motion.
but! (always one of these)
![clutch3.jpg clutch3.jpg](https://www.hobby-machinist.com/data/attachments/66/66168-0f5caf87a4af774edc36f2da2262d2c5.jpg)
If I move the telescope by hand it overcomes the friction as it should but the shaft turns and unscrews the nut controlling the friction pressure.
Any ideas how I can prevent this from occurring considering that it will be a knurled large wheel not a nut so the tension can be varied with it.
One thought I've had is to use a deep groove bearing where the outer race is set in the arm and the inner race is a tight fit to the bolt.
I've fabricated a proof of concept to see if it would work and it does with a very smooth motion.
but! (always one of these)
![clutch1.jpg clutch1.jpg](https://www.hobby-machinist.com/data/attachments/66/66166-d086844e64ec16ec1d85a9094925b4c1.jpg)
![clutch2.jpg clutch2.jpg](https://www.hobby-machinist.com/data/attachments/66/66167-ada952f0c699ab29bc71fb9da7450650.jpg)
![clutch3.jpg clutch3.jpg](https://www.hobby-machinist.com/data/attachments/66/66168-0f5caf87a4af774edc36f2da2262d2c5.jpg)
![clutch4.jpg clutch4.jpg](https://www.hobby-machinist.com/data/attachments/66/66169-196b7368e36bcd92d4624120c45c586a.jpg)
If I move the telescope by hand it overcomes the friction as it should but the shaft turns and unscrews the nut controlling the friction pressure.
Any ideas how I can prevent this from occurring considering that it will be a knurled large wheel not a nut so the tension can be varied with it.
One thought I've had is to use a deep groove bearing where the outer race is set in the arm and the inner race is a tight fit to the bolt.