Posted by TimWafer on February 15, 2020 at 05:59:52 from (98.21.118.93):
In Reply to: Vbelt sizes?? posted by TimWafer on February 14, 2020 at 07:05:28:
I went into the local hardware store last night and they have a whole wall in their back room with v belts hanging on it. We looked over the array of belts there and studied them for at least 20 minutes. I noticed that all the packages or wrappers actually list the actual outside circumference (OC) often in very small type somewhere on them. The belts themselves however do not. Some of these belts were obviously older than others as the store has been in business since 1943 .
Looking at all these belts I made the following observations.
Using a 65" OC belt 1/2" wide as an example size to compare.
Some are labeled 4L650 and actually say industrial belt next to that.
Some are just labeled 4L650
Some are labeled A63
Some are labeled A63/4L650
Some had a K after the designation which presumably means Kevlar
Some are labeled 6865 (these were Gates green belts)
Most of the newer looking stock had either the A63 or A63/4L650 designation.
I guess my only real question at this point is why the A63 type designation would go by the approximate inside circumference (IC) of the belt rather than the actual OC. The IC seems to be hard if not impossible to accurately measure either on the belt or the pulleys. Why add 2" to the designation of an A belt to get the actual size. That designation seems to defy all logic in my mind.Yet it seems to be what is dominate now. I must be missing something.
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