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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Rubber belting, where to buy (USA), etc
There are round polyurethane belting products available for using as
replacements for light/medium V-belts. The recommended pulley sizes are possibly being stated for power transmission, as in round belting in a V-belt pulley groove needs a minimum surface contact area to transfer a certain amount of power (definite maybe).. and V-belts exhibit nearly full surface contact in V-pulleys. Since you're not wanting to use a round rubbery product for delivering power, I believe you can disregard those recommendations, within reason (not trying to run a fat belt around a tiny wheel). The urethane product I'm familiar with is supplied on spools so any length of belt can be fabricated. There was a "special" heating tool.. a fairly large soldering iron with a thin flat plate mounted as a tip. The belting would be cut slightly shorter than the circumference of the V-belt it was to replace. The ends need to be cut squarely, then placed into a small jig/fixture to hold the ends in proper axial alignment and the hot flat tip of the iron was used to heat both ends simultaneously. When the ends showed sufficient melting was taking place, the iron was pulled out and the ends were jammed together until the joint cooled.. plastic welding basically, very similar to bandsaw blade welding. There would be a little upset flash flaring out at the joint that was trimmed away after cooling, then the belt is checked for strength. Since the endless round PU belting has no cords, it's a bit stretchy, thus the need for making the circumference a little shorter to keep it tensioned in use. As someone suggested, you may be able to find molded O-ring PU shapes in the profile(s) you might want to try.. such products are already made as impact/bumper guard-type items or maybe even toss ring toys (for family fun in a coneheads get-together), dog chew toys etc. Industrial suppliers are likely to have round urethane belting available for purchase by the foot (but not Fastenal last time I checked a couple months ago). A metal joining heating/melting plate (not a flame) could be improvised and suitable after a little practice. If it needs to be said.. don't breathe the fumes resulting from heated plastics. I'm guessing, but fairly sure you wouldn't want to rely on a trial and ouch-error adhesive for an application you're suggesting. I'd be more confident in a fused/welded material with no "this oughta work" secondary compound applied. I doubt there would be any thump-thump noticed if the weld join and trimming are done properly, as the entire length would likely be about the same density/hardness. -- WB .......... "John Doe" wrote in message b.com... Search results produce search results within search results. Where to buy round rubber belting online? So far, I have one or two possibilities, McMaster-Carr and Cadence Supply Company. Also. How can you tell the minimum pulley outer diameter of a rubber belt? McMaster-Carr says that their 3/16 inch rubber belts have a minimum pulley diameter of 1 1/2 inches. Is there some rule, like a belt that is twice as thick requires a pulley that is twice as wide? Any other information about rubber belting is appreciated. Like resources for gluing the ends together. I will check YouTube. Thanks. |
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