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Author Topic: Sydney Blue Gum - Best Blades?  (Read 1095 times)

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Offline JohnnytheFish

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Re: Sydney Blue Gum - Best Blades?
« Reply #20 on: June 29, 2020, 06:13:59 PM »
As in where the v belt contacts the pulley first? 

Offline JoshNZ

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Re: Sydney Blue Gum - Best Blades?
« Reply #21 on: June 29, 2020, 06:41:37 PM »
It's hard to measure where exactly. If you wrap your belt around the pulley, measure the diameter between the top of the belt in its grove, minus maybe 1/8-1/4". That'll be close enough.

A belt going around a pulley is a pretty dynamic thing on a closeup level. Only one point on the belt profile is in perfect sync with the pulley, the very outside is expanding and slipping slightly and the inside is shrinking and slipping slightly.

When buying pulleys they'll usually specify a pitch diameter, which will be different to OD.

Offline ladylake

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Re: Sydney Blue Gum - Best Blades?
« Reply #22 on: June 30, 2020, 04:37:23 AM »
Blade speed calculator is in the toolbox to the left on the screen under the sponsors
https://forestryforum.com/members/donp/bandspeedcalc.htm

D
Anyone know where I should measure the pulley wheels from for this calculator?
Outside Diameter? Bottom of the Groove? Or is there an amount one subtracts for the type of belt? Mine are A type.
Thanks again for all the help.
Measure the outside of the pulleys.   You really should switch over to B belts,  I think A belts will slip to easy.   Steve
Timberking B20 15000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Suffolk  setter Volvo MCT125c skid loader

Offline JohnnytheFish

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Re: Sydney Blue Gum - Best Blades?
« Reply #23 on: July 05, 2020, 06:58:20 AM »
Thanks Steve - will do. Seems to be cutting pretty well at the moment on cypress with the small pulley but when I go back to the gum I will get an 18 inch pully wheel with the 4 inch in B belt 


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