New Rollers Slightly Different Diameters

Hi All,
I just received two newly recovered rubber rollers for a #4, done by Rotadyne. I measured the rollers and one is bigger than the other in diameter by 1/32″. One roller is 2 1/2″ and one is 2 1/2 plus 1/32. I asked the roller company to make them 2.515″ in diameter. Should I send the rollers back to be remade? The difference in diameter- between the two rollers- if I did the math right is .03125. I think that is probably too much. What do you think?
Thanks,
Martha

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Nathan Rose
13 years ago

Guys,
Thanks for this strain, it helped me solve a quirk on my #4 that has been bugging me for a long time now. My chattering, sticky rollers are now running smoothly thanks to a 2-minute adjustment to the blocks supporting the upper frame.
Go Vanderblog!

Paul Moxon, Moderator
Admin
13 years ago

Great point Eric. Matching diameter is much more critical on the old style, “bottom frame” form rollers and the removal “top frame” double-rider oscillator prior to the Universal “quick change rollers” and hinged single-rider oscillator.

Martha: please do let us know how this turns out.

Eric Holub
Editor
13 years ago

The only problem I see is that when both rollers are set to .918″, the larger roller will be 1/32″ higher at top, and the distributor rollers won’t contact evenly. You may be able to shift the distributor assembly (the upper frame) away from the larger roller to the point that it contacts both forms evenly, but that still may be a problem for the rider roller contacting it.
To shift the position of the upper frame, there are blocks on either side of the carriage, that bear against the ends of the cross-rods of the upper frame. Loosen the screws, shift the blocks, re-tighten the screws, and the rest position of the upper frame can be moved (or skewed) as needed.
On other models such as the Universals and SPs, slightly different roller diameters would probably not make much difference, due to the play built into the positioning of the oscillator. But on these models with the three-roller upper frame, matched rollers are preferable. The question is to what tolerances does Rotadyne guarantee their product? 1/32 is pretty coarse.

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