Rotary motion to reversible linear motion
- Thread starter Brian Rupnow
- Start date
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Maybe.
So, getting very close to a working module. The 1/8" cross section o-ring on the final drive shaft is going to have to be changed, as the action is rather intermittent right now, (it slips) but it does work. The simplest change would be to go to a 3/16" cross section o-ring, and tomorrow I will try that. It is a very interesting little project. I won't build the transfer cart and the rails until I get this drive working okay.---Brian
Hi Brian, Is the O-ring in a Vee groove? A Vee is the better shape for developing friction and preventing slippage - I think?
What material O-ring are you using? Some elastomers are a lower friction than plain or nitrile rubber... Viton is a lower friction I think? - Better to avoid those? - I use Nitrile, because that's what I happened to have. I think it was intended for a domestic water seal - use with a plastic fitting of some sort onto Bathroom ceramic? It didn't like any oil on the drive surfaces, but liked a little roughing of the disc surface from the Knurling tool. It gave the steel-rubber interface a "tread". - Works with very low contact pressure on my model, but yours is on a proper machine drive , many orders of magnitude greater than my steam boat drive.
K2
What material O-ring are you using? Some elastomers are a lower friction than plain or nitrile rubber... Viton is a lower friction I think? - Better to avoid those? - I use Nitrile, because that's what I happened to have. I think it was intended for a domestic water seal - use with a plastic fitting of some sort onto Bathroom ceramic? It didn't like any oil on the drive surfaces, but liked a little roughing of the disc surface from the Knurling tool. It gave the steel-rubber interface a "tread". - Works with very low contact pressure on my model, but yours is on a proper machine drive , many orders of magnitude greater than my steam boat drive.
K2
The o-ring is nitrile rubber setting in a v-groove. The face of the contact wheel has been sandblasted to give it a uniform rough surface.
