Can anyone help me with Dia. sizes of the cog pulleys bellow:

27 Tooth
28 Tooth
30 Tooth
32 Tooth
73 Tooth
77 Tooth

Thanks for the help.

 

What's the pitch? Also what are you trying to figure out? Judging by the tooth count this is 8mm pitch.

If so this is how you do it for a rough sizing:

[(tooth count) X (pitch)] / (pi) = diameter in mm

Then to convert to inches divide that number by 25.4

If you are trying to figure out drive ratios then it's just the crank pulley tooth count divided by the blower pulley tooth count.

I hope this helps.

Max

 

Thanks Max.

The pitch is 8 mm as per your guess.
I am trying to figure out the diameter of these cog pulleys.

Sorry, but what does (pi) stand for on your formula?

[( 27 ) X ( 8 )] / (pi ???) = diameter in mm

I have a 8 Rib set up at present and want to change to a cog set up using the same existing ratios.

 

pi is pi....3.142

 

27 tooth - 68.75 mm or 2.7 inch diam

28 tooth - 71.3 mm or 2.8 inch diam

30 tooth - 76.4 mm or 3 inch diam

32 tooth -81.5mm or 3.21 inch diam

34 tooth-86.6mm or 3.41 inch diam

36 tooth -91.7mm or 3.61 inch diam

38 tooth -96.8mm or 3.81 inch diam

40 tooth-102mm or 4 inch diam

42 tooth 107mm or 4.2 inch diam

44 tooth-112mm or 4.41 inch diam


70 tooth-178mm or 7 inch diam

72 tooth-183mm or 7.2 inch diam

73 tooth -186mm or 7.32 inch diam

74 tooth-188mm or 7.4 inch diam

76 tooth-194mm or 7.64 inch diam

77 tooth-196mm or 7.72 inch diam

78 tooth -199mm or 7.83 inch diam

80 tooth-204mm or 8 inch diam

 

 

Guys, thanks for the info.

Got the exact information that was looking for.