- #1
Stormer
- 113
- 22
A Hobson's joint is a kind of gearless angled drive. Most often a fixed 90 degree angle, but there is also versions with free moving joints in each axle so it can move to any angle up to a little over 90 degrees. It is today mostly just a novelty and there is very few applications actually using it because a bevel gear or similar is used in stead.
But how efficient is actually this drive in practice? I know it depends on the friction of the bushings the axles ride in and the load, but what is a ballpark number? For example for some polished stainless axles running in PTFE or oilite bushings (there is usually to small of a space to fit ball bearing linear guides) with "moderate" loads and low speed? I have searched but not found any reliable numbers.
But how efficient is actually this drive in practice? I know it depends on the friction of the bushings the axles ride in and the load, but what is a ballpark number? For example for some polished stainless axles running in PTFE or oilite bushings (there is usually to small of a space to fit ball bearing linear guides) with "moderate" loads and low speed? I have searched but not found any reliable numbers.