I just did a video covering how to measure for replacement belts. There are links in the video description to the manufacturer of belts I used as well as where I bought them from.
The general idea if you have the original belt is to cut the belt in two and measure the length. The belts are old stretched so multiply the measured length by 0.95 (95%) to account for stretch. Then find the closest belt. I think you are missing a decimal point in your cross-section measurements, i.e. 0.03” rather than 0.3”. https://youtu.be/aqW6cF-4btI Jeff Birt From: M100 <[email protected]> On Behalf Of Viral Infection Sent: Saturday, January 28, 2023 6:56 PM To: [email protected] Subject: [M100] CTR-41 Belts Dimensions? Good evening, I’m a new owner of an M100, after purchasing it in a lot with a number of accessories. One of those was the Realistic CTR-41 tape drive, the model that shipped with the first run of TRS-80 Model 1s, and it needs new belts. It seems this model was quickly replaced by a number of other models, and I can’t seem to find much info on this drive, and my cheap-o calipers aren’t accurate enough to get a good measurement of these stretched-out belts. Based on what little info I’ve been able to find, they appear to be imperial instead of metric, but I truly have no idea. I *think* the belts are as follows, but my equipment is so primitive, I’m probably wrong: Main Belt: 10” diameter, square, 0.3”x0.4” cross-section Secondary Belt: 6” diameter, square, 0.3”x0.3” cross-section There is one ebay seller with a kit, but it’s almost $26 after shipping, and if I can get the measurements, I’m sure I could track down the belts myself for cheaper. Thanks, -vi
