Re: [CAD_CAM_EDM_DRO] wood sander rebuilding

Ted that sounds good for light duty machines.
Thank you
Sven Peter

"R. T. Robbins" wrote:

> At 11:13 AM 3/8/01 -0800, you wrote:
> >The working drums are about 300 mm diameter and little more than 1,40 m
> >long.
> >The pivoting drums for tensioning and positioning are diameter 175 mm
> >and 1,38m long. They have their pivot close to the middle of the drum.
> >where the tensioning cylinder is.
> >
> >What I need is:
> >First: How is the appropriate barrel form of the tensioning drums?
> >One is completely worn and the other some genius turned it straight!
> >I guess at the moment that I need in the centre 2 mm more diameter than
> >on the ends and the form is a radius.
>
> I can't help you on the other questions, but a trick I have used
> successfully to cheaply renew and enlarge the diameter of rollers in this
> sort of situation is
> 1: the easiest if it fits, use heat shrink tubing and bring it up in any
> contour you want because each layer is quite thin and you can step them.
> Then average them with a final heat shrink tube that goes over the whole
> length of the roller.
> 2: the cheapest if you just need straight increase in roller diameter. Use
> flexible polyvinyl tubing and an air compressor. The compressor (fitted
> with a pipe-to-airline fitting you can easily make up) provides air
> lubrication and stretching. Sometimes you have to heat the end of the
> tubing to get it stretched enough to start onto the roller, but then the
> air compressor does the work. Often it takes a helper or two to feed the
> vinyl onto the roller. I suspect a sander would let you shape the vinyl
> after you get it onto the roller. I have used more than one layer of vinyl
> tubing to get substantial thicknesses. This is much cheaper than heat
> shrink tubing, but I would shape the inner layers, then add a full
> thickness outer tube to average the surface.
>
> Ted
>
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