Tandberg Reel to Reel I need a new belt = maths help

[Dr Doofenshmirtz]

My Tandberg 3300X needs a new belt as the old one had snapped.
If I lay out the belt flat, it measures 62cm in length and is 3mm wide.
I was going to order a Nitrile belt from here https://simplybearings.co.uk/shop/index.php?cPath=... (I know an O-ring isn't ideal, but it's rarely used)
The question is...what is the bore size of that belt ? 62cmx3mm ?

Edited by Dr Doofenshmirtz on Sunday 28th July 22:15

[OldGermanHeaps]

197mm, but the o ring has a circular profile not a flat one so you will only have a tiny fraction of the surface area in contact as you would with a belt.

[OldGermanHeaps]

what about this https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2...

[Dr Doofenshmirtz]

OldGermanHeaps said:

197mm, but the o ring has a circular profile not a flat one so you will only have a tiny fraction of the surface area in contact as you would with a belt.

Thanks...the belt is round not flat. Is it still 197mm? (Sorry I’m no good with maths)

[Mr Pointy]

If you have measured the length at 620mm that's the inside circumference of the belt when it was a circle.
To calculate the diameter (or bore):

Diameter = Circumference/pi = 620/3.142 = 197.4mm
https://circumferencecalculator.net/circumference-...

From the page you link to this is the closest item:
https://simplybearings.co.uk/shop/p81518/3mm-Secti...

[paul.deitch]

You know that you can buy spares for that model? I have done the same job with another old reel-to-reel. No need to faff about measuring normally.

[Dr Doofenshmirtz]

Thanks all.
Yeah I know you can buy belts but thy're also Nitrile, so the same as the supplier in my link above, but costing £20 rather than £6.

[996owner]

http://taperecorder.co.uk/

[OldGermanHeaps]

Dr Doofenshmirtz said:

Thanks all.
Yeah I know you can buy belts but thy're also Nitrile, so the same as the supplier in my link above, but costing £20 rather than £6.

just check the o rings arent less pliable or it might wreck the bearings