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| smthrll:
I was hoping to get some input from some folks on a project I'd like to tackle. I'm still new to machining and I roughed out a sketch that I hope will help explain. I'd like to create: - although shown as 2 separate rollers, the inertia roller will be placed inside the outer roller - the inertia roller will have bearings pressed into the ends (shown in blue), and it will spin on a fixed shaft. - the stub on the inertia roller will protrude beyond the outer roller, so it can be driven by a belt My question: - can I press a bearing in the outer roller and have it ride on the inertia roller's stub - I'm guessing there will be a problem with the bearing rubbing on the face of the inertia roller - I'm not sure of the proper way to create a gap between the bearing and the face of the internal roller. The inertia roller will be running about 3x faster than the outer roller. I thought maybe leaving a bit of a raised surface on the stub shaft to ride against the inner ring of the bearing. My apologies to all the engineers and machinists that are doing a face palm right now.... Rollie |
| awemawson:
It probably me being slow on the uptake, but I'm having a problem visulising what you are trying to achieve. It seems to me you are trying to construct three elements, all mutually co-axial and separated by bearing races, is this the case? Perhaps were you to reveal your application it would be clearer as I've no idea what an inertia roller is! |
| mattinker:
Like Andrew I don't know what an inertia roller is! To prevent the face of the outer bearing touching the "inertia roller, you can either space it away with a washer or leave a small step on the end of the said "inertia" roller. Maybe I'm completely off the track!! Regards, Matthew |
| smthrll:
Thanks for the replies. You are on the right track completely and have described the question better than I. -project is for the back roller for a set of bicycle rollers. It is a trainer that allows the rider to bike as if he was outdoors. I've attached a picture of Trutrainer's product. It has an internal flywheel in the last roller - this allows the rider to coast, as the inertia keeps driving the outer drum on the middle roller even when stopped pedaling. So yes, all 3 elements are mutually coaxial and separated by bearing races. Maybe a washer or a small step is all I need for separation? I was worried about wearing out the bearing race of the outer roller rubbing on the end face of the inertia roller. I can understand the roller rotating on a fixed shaft, but I wasn't sure if there's problems with the outer roller rotating on another spinning shaft. Tried reading the SKF bearing catalogue - bearings are actually pretty complex. Once everything is assembled, there is really no way to provide lubrication. Rollie |
| awemawson:
Probably just a collar or thick washer is all you need. :scratch: |
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