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Typically, however, the ratios are not used to design a level of torque; they are
used to create a saw with the optimum blade speed (blade Shaft RPM) for you.
The major factors are:
• diameter of blade(s) you commonly use, and
• cutting conditions you work under
The 4 gear ratios we have designed into the SP-6457 TD 4-speed Blade Shaft are:
1
st
Gear 1.00 : 1
2
nd
Gear 1.34 : 1
3
rd
Gear 1.70 : 1
4
th
Gear 2.02 : 1
In addition to the four” fixed” ratios of the Blade Shaft gears, we can also tailor
the Blade Shaft RPM (blade speed) by adjusting the “primary” ratio between the
engine and the Blade Shaft. By selecting a Blade Shaft sheave and Engine sheave,
a multitude of additional ratios (and Blade Shaft speeds) are possible. The
following Sheave sets are available as standard kits:
5.1 6.0 1.17 : 1
2333 in 1st
1741 in 2nd
1372 in 3rd
1154 in 4th
2800 18609
5.4 5.6 1.03 : 1
2700 in 1st
2000 in 2nd
1588 in 3rd
1350 in 4th
2800 18611
6.0 5.0 .83 : 1
3373 in 1st
2498 in 2nd
1984 in 3rd
1686 in 4th
2800 18612
Engine
Sheave
Blade Shaft
Sheave
Ratio Blade Shaft RPM
Engine
RPM Kit #