MakeEverything
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| posted on 30/7/10 at 02:14 PM |
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Belt lengths
For the life of me, i cant remember the formula for calculating the length of a Vee belt on three pulleys.
Can anyone shed any light on this please?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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adithorp
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| posted on 30/7/10 at 02:28 PM |
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I've never tried it but I'm told this works...
Measure around pulleys with string in the bottom of V (l).
Measure depth of V in pulley (r).
Then the external length of the belt (L) is 2 x r x pi + l = L
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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blakep82
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| posted on 30/7/10 at 02:57 PM |
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don't you just wrap a bit of string round it (with the tensioner at its smallest setting) and measure the string? then do the same with the
tensioner at the longest setting, and get one somewhere in the middle?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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adithorp
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| posted on 30/7/10 at 03:08 PM |
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No because belt lengths are the external measurement and the string measures the inside. there'll be 20-30mm difference.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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MakeEverything
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| posted on 30/7/10 at 03:30 PM |
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quote:
Originally posted by adithorp
No because belt lengths are the external measurement and the string measures the inside. there'll be 20-30mm difference.
Well, i measured the belt at 890 and added 30mm for the belt thicknesses around the pulley, but when i went to halfrauds, their belt is 1000mm.
Ive fitted it, and im glad i didnt go any smaller.....
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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MakeEverything
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| posted on 30/7/10 at 03:35 PM |
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quote:
Originally posted by adithorp
I've never tried it but I'm told this works...
Measure around pulleys with string in the bottom of V (l).
Measure depth of V in pulley (r).
Then the external length of the belt (L) is 2 x r x pi + l = L
Using this would have given me a belt length of 952..... Maybe as a minimum, but being 50mm out (2" would be too tight and i wouldnt get it
on.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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blakep82
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| posted on 30/7/10 at 03:59 PM |
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well if you did it with a tape measure it would sit on the outside of the pulley 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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designer
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| posted on 30/7/10 at 04:13 PM |
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Why not go to the local factors and buy a metre of this stuff?
http://toolmonger.com/2009/04/24/fenner-power-twist-v-belts/
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MakeEverything
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| posted on 30/7/10 at 05:22 PM |
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quote:
Originally posted by blakep82
well if you did it with a tape measure it would sit on the outside of the pulley
If i did it with a tape measure on the outside of the pulley, it would be too big....???
No, i did it with string.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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tomgregory2000
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| posted on 30/7/10 at 06:16 PM |
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this is when it is handy to keep old belts and then play the cut and shut game and then measure
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