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Unread 31-01-2013, 17:42
WarehouseCrew WarehouseCrew is offline
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Re: Belt pulley options
What do you use to tension your belts?
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Unread 31-01-2013, 22:28
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Re: Belt pulley options
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What do you use to tension your belts?
Proper center-to-center distance.
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Unread 31-01-2013, 23:07
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Re: Belt pulley options
Do belts stretch like chains do?

I think some cars have idler pulleys to keep the belts under the correct tension. It would be nice (and lighter) if idler/tension pulleys were not needed.
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Unread 01-02-2013, 02:12
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Re: Belt pulley options
These belts have a fiberglass cord backing so in FRC usage they don't have a big problem stretching. We add .005 - .003 inches to the C-C distance given by the calculator and have no had any issues.
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Unread 01-02-2013, 04:06
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Re: Belt pulley options
Quote:
Originally Posted by Alan Anderson View Post
Proper center-to-center distance.
How do you determine this? I used the online calculator from SDP-SI for some XL belts and pulleys from McMaster, and when they showed up it was way off. So, I'm just going with holding the actual setup tight and measuring it out. Does this sound like a plan?
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Unread 01-02-2013, 04:43
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Re: Belt pulley options
Quote:
Originally Posted by sanddrag View Post
How do you determine this? I used the online calculator from SDP-SI for some XL belts and pulleys from McMaster, and when they showed up it was way off. So, I'm just going with holding the actual setup tight and measuring it out. Does this sound like a plan?
We used the SDP-SI calculator for over 8 belt runs and they have all been dead on, we are using GT2 3mm and 5mm pitches. I believe you can also calculate this using pitch lengths and diameters giving by the part's specs.

Could you have had an inches metric conversion error? Or an mis ordered part?
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Unread 01-02-2013, 11:11
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Re: Belt pulley options
I've used the SDP calculator for multiple projects as well, FRC and others, and it's never led me wrong. I'd suspect something else happened there.

-Mike
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Unread 01-02-2013, 11:21
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Re: Belt pulley options
If you're planning to spin a shooter wheel at high speed I'd suggest urethane belting instead of a toothed belt.
  • It's a piece of cake to make a pulley on a lathe
  • The center distance isn't critical
  • Belting is cheap and easy to make in any length
  • If the wheel jams the belt can be set to slip a little preventing a full stall.
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