- #1
Nick09
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- TL;DR
- Torque to turn a large Rotisserie
Hi - I'm trying to design a Rotisserie for fabrication of large UC beams, and could do with some physics help if possible please.
The idea is... I'll create collars to allow a UC beam to turn on a set of rollers during fabrication process.
The largest item I have weighs in at 4225kg including the collars I'm fitting around to make it circular for turning.
The Collar has a radius of 450mm.
The C of G is pretty much axially aligned, but is 3.5mm out due to some features on the beam.
The collar with the beam in sits on 2 off bearing shafts with R45 wheels upon it
What torque would I need to turn the beam in its rotisserie from rest?
I'm looking for force required to turn it in small increments from rest, as I reorient it to welding requirements. Its not spinning at a constant speed etc.
Could anyone assist?
Thanks in advance if you could.
![2026-04-30 16_43_15-FD-08-499-001.iam ([Primary]) iProperties.webp](https://www.physicsforums.com/attachments/2026-04-30-16_43_15-fd-08-499-001-iam-primary-iproperties-webp.371282/ "2026-04-30 16_43_15-FD-08-499-001.iam ([Primary]) iProperties.webp")
The idea is... I'll create collars to allow a UC beam to turn on a set of rollers during fabrication process.
The largest item I have weighs in at 4225kg including the collars I'm fitting around to make it circular for turning.
The Collar has a radius of 450mm.
The C of G is pretty much axially aligned, but is 3.5mm out due to some features on the beam.
The collar with the beam in sits on 2 off bearing shafts with R45 wheels upon it
What torque would I need to turn the beam in its rotisserie from rest?
I'm looking for force required to turn it in small increments from rest, as I reorient it to welding requirements. Its not spinning at a constant speed etc.
Could anyone assist?
Thanks in advance if you could.