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Handy dandy pulley calculator.

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websterz:
http://www.forestryforum.com/members/donp/pulleycalc.htm

I am building a power hacksaw and needed to calculate the jackshaft numbers needed to reduce a 1750 RPM motor down to 60-70 RPM. You can do this easily by putting in the first set of numbers, in my case a 2.125" drive pulley running at 1750 RPM driving an 11" sheave. This gives me 338 RPM. By re-inputting the new speed and leaving the pulleys the same I can see the effect of  a jackshaft assembly consisting of a 2.125" to 11" pair, driving a second 2.125" to 11" pair on a 1750 RPM motor. I end up with 65 RPM. Just where I want it. Hope this link helps someone.  :thumbup:

tinkerer:
Hey Websterz,
The calculator is cool, but it won't do me any good until you put up a tutorial with pics on how you are building your power hacksaw. :lol:
Seriously, How do you deal with the feed rate through the material and all of the other things i will need to know. :coffee:

websterz:
Here ya' go:

http://www.vintageprojects.com/machine-shop/power-hackSaw.pdf

tinkerer:
Cool beans buddy. That looks easy enough. Thanks.

fluxcored:
Hi Guys,

How's it going with the power saw building? I started in October and am still not even close to finishing.

I've turned the shafts and rebushed pulleys for the primary drive shafts and although my efforts will not win first prize, I'm happy with the outcome thus far. I just finished a cam this weekend to provide a lifting action and possibly drive a coolant pump.

I suspect that the motor I have will be too puny too drive this contraption.

I figure on making the slide bar and saw frame next so that I can see where the secondary drive shaft and crank should go. Besides I'm all out of cash for bearings for the secondary shaft.

All odds are against the saw working first time around as I'm just winging it but it's a lot of fun, let me tell you, and I'm not going to mind fixing and improving on it.

Hope you guys are doing better than I am. :D

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