coupling cardboard to a shaft
coupling cardboard to a shaft
(OP)
Hi, I have a shaft that has a cardboard tube slide over it. I want the tube coupled to the shaft so they spin together. The problem is that cardboard tube is completely covered on top, so I can't just put a clamp on an exposed section and be done with it.
Basically the cardboard needs to be coupled to the shaft internally.
Currently the shat it slides on is 2-7/8" OD and the cardboard tube is 3" OD.
Does anyone know of anything that I can get that can take up clearance, like a set of shims for a shaft or the like?
Basically the cardboard needs to be coupled to the shaft internally.
Currently the shat it slides on is 2-7/8" OD and the cardboard tube is 3" OD.
Does anyone know of anything that I can get that can take up clearance, like a set of shims for a shaft or the like?





RE: coupling cardboard to a shaft
Mike Halloran
Pembroke Pines, FL, USA
RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
Mike Halloran
Pembroke Pines, FL, USA
RE: coupling cardboard to a shaft
Is this some kind of rough proto, or something you'll deliver to customers or what?
Look at how they do it on plotters and the like if for production.
If for proto or similar then as Mike suggests, I'd probably wrap some kind of tape around the shaft at either end until I got enough for a slight interference, maybe reinforce it with a little adhesive.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: coupling cardboard to a shaft
However, the shaft has no problem if duct tape is on its end. So before the material rolls onto the shaft, I'll duct tape the cardboard to the shaft.
I'll experiment with combinations of grip tape and duct tape to get my desired results. However please advise if you think there's a better way.
RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
What's the function of the cardboard?
RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
"Art without engineering is dreaming; Engineering without art is calculating."
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RE: coupling cardboard to a shaft
Not sure what the product is though... Is shaft a constant fixture, or the end product? Is carboard tube a replaceable test fixture, or the end product?
I'm imagining a shaft with traditional keyways cut into it (2 @180* or 4 @ 90*.) Instead of traditional key, the 'key' is a piece of spring steel that is longer than the keyway. Set screw the ends down into the shaft so the middle curves up above the shaft OD.
This will provide some tension on the tube as it slides on (vary the tension by the length or thickness of the spring steel) without damaging the surface or making installation/removal difficult.
RE: coupling cardboard to a shaft
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RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
"The problem is that cardboard tube is completely covered on top, so I can't just put a clamp on an exposed section and be done with it."
RE: coupling cardboard to a shaft
RE: coupling cardboard to a shaft
The bladder type would also allow more clearance while the mandrel type would normally require almost a slip fit. This was because you wanted very little expansion in the mandrel to insure that the tube stayed round.
Sorry I don't have any links as all the manufacturers and suppliers that I was acquainted with are no longer in business since the demise of the textile industry.