Great to find a real world use for algebra! However, I was inspired to use your spreadsheet to calculate the length of a belt for a Philip reel-to-reel I'm trying to fix but the belt length was much longer than I was expecting. On working through the formula, I think there's an error in your spreadsheet? Cell A6 which relates to half the circumference of the smaller wheel has the formula for the circumference of the *full* circle (ie 2.π.r). Cell A7 which relates to the bigger wheel calculates the circumference of the bigger wheel and then correctly divides it by 2 ie (2.π.r)/2. The output is therefore overstating the calculated length of the belt by adding in an uneeded second half of the circumference of the smaller wheel.
Perfect! I used the string method, and it didn't work well at all. But I would have had to disassemble most of the deck to get at the pulley and flywheel... which had to be done anyway to install the belt.
It was a Sears LXI from 82(?) which had zero info on the web about it. It's a neat doorless deck that sounds excellent but smells like it was dipped in flux.
I love that smell. A cross between electrical celery and cat piss. I see your point though. Sometimes you just can't get in to measure up, or there are three pulleys on one belt. Sometimes trial and error is all you have!
This is great to know the download will be a great help .
Very useful info and the excel file, much appreciated!
Glad it was helpful!
Great to find a real world use for algebra! However, I was inspired to use your spreadsheet to calculate the length of a belt for a Philip reel-to-reel I'm trying to fix but the belt length was much longer than I was expecting. On working through the formula, I think there's an error in your spreadsheet? Cell A6 which relates to half the circumference of the smaller wheel has the formula for the circumference of the *full* circle (ie 2.π.r). Cell A7 which relates to the bigger wheel calculates the circumference of the bigger wheel and then correctly divides it by 2 ie (2.π.r)/2. The output is therefore overstating the calculated length of the belt by adding in an uneeded second half of the circumference of the smaller wheel.
Top tip thankyou! I do try with maths but don't always succeed. I'll update.
Perfect! I used the string method, and it didn't work well at all. But I would have had to disassemble most of the deck to get at the pulley and flywheel... which had to be done anyway to install the belt.
It was a Sears LXI from 82(?) which had zero info on the web about it. It's a neat doorless deck that sounds excellent but smells like it was dipped in flux.
I love that smell. A cross between electrical celery and cat piss.
I see your point though. Sometimes you just can't get in to measure up, or there are three pulleys on one belt. Sometimes trial and error is all you have!
@@pwrestoration Ha!! "Elecrical Celery" is my new band name that does chip tune covers of 80s Toronto pop bands.
@@MikeDS49 For undiluted electrical celery open a CDR spindle and take a whiff!
Could you please tell me what is the belt size required for the large Poly on the Leak 3007, Thanks for any help.
Whhhhhoooosssshhhhh over my head 😅
When you said "half the diameter" you meant half the circumference. Other than that, good.