HP Forum Archive 14

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7470a plotter gummy wheel question Message #1 Posted by andy on 28 Oct 2004, 12:43 p.m. The 7470a plotter has two wedge-shaped gummy wheels located over the two abrasive wheels which move the paper back and forth. One of my gummy wheels has developed a flat spot in it. This causes quite a bit of chatter when the paper is being moved back and forth. Has anyone here repaired one of these before? Is the wedge shape critical or will a straight cylinder work? Thanks, Andy

Re: 7470a plotter gummy wheel question Message #2 Posted by David Smith on 28 Oct 2004, 3:11 p.m., in response to message #1 by andy The paper drive wheels in the HP97, etc also develop flat spots. A little careful work with some sandpaper can work wonders in getting them going again.

Re: 7470a plotter gummy wheel question Message #3 Posted by James on 29 Oct 2004, 7:41 p.m., in response to message #1 by andy From an article I believe I read in HP Digest a long time ago, the tapered roller shape is designed to keep the paper taught and against the guide at one side. So, I would attempt to maintain/reproduce the shape as much as possible, although the overall diameter may not be critical. If the flat spot is a result of leaving the roller pressure engaged for a long time, perhaps it will improve a bit after some relaxation and use. If you find/develop a good replacement, please let us know. Good luck!

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