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Author Topic: Belt pully to pto?  (Read 2876 times)

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Offline 1wkinsley

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Belt pully to pto?
« on: September 14, 2015, 06:46:44 PM »
Hello,

I posted a while ago about my new belsaw powered by a farmall b. I have got my  hands on a chrysler industrial motor out of a discarded combine. The shaft has a big belt pully on it. I still want my sawmill  to be pto driven, how can i get a pto on there or what do i need?

Wynn

Offline lawnsbylane

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Re: Belt pully to pto?
« Reply #1 on: September 14, 2015, 07:18:28 PM »
Wynn what type of pulley do you have on the mill.  I had a belsaw on trailer with a 36 inch flat pulley 6 inches wide.  If you wanted you could make like a pilliar block with a shaft and a flat pulley on one side and a v belt on the other. You could also just put a flat pulley on the motor and play with the sizes to get the rite rpms. 

Offline 1wkinsley

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Re: Belt pully to pto?
« Reply #2 on: September 14, 2015, 07:25:43 PM »
The shaft of my motor has belt pulleys on it. My mill has a pto shaft on the mandrel.

Offline UN Hooker

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Re: Belt pully to pto?
« Reply #3 on: September 14, 2015, 09:36:21 PM »
 1wkinsley
    That Farmall PTO turns 550 RPM, the Chrysler motor turns 1800 RPM.
  Some how yer gonner need some reduction - like a jackshaft ??
          UN
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Offline svart ole

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Re: Belt pully to pto?
« Reply #4 on: September 14, 2015, 09:53:45 PM »
I am going to assume that the engine has a over center clutch on it and the output shaft would be straight out the back of the engine.

You are running the mill off a 540 PTO.

Issue one you need to have some reduction to take engine speed down to a 540 rpm output.

Issue two is if you are power the mill with the PTO off a tractor, when you stand in front of the tractor and look at the saw it is turning counter clockwise. If you set the power plant there and stand in front of the radiator and look at the your engine will turn clockwise. Saw will turn backwards.

Best fix in my book. Mount the engine on a good solid steel frame. You will end up setting the engine with the front (radiator end) facing the mill. Mount a shaft to the frame so it extends from the front of the motor back far enough to mount a pulley on it to line up with the output pulley on the back of the motor. Pick a set of pulleys that will match engine rpm to a 540 rpm on the jack shaft.

Couple the radiator end of the shaft to you arbor with a PTO shaft and you are good to go. If you where to stand on the opposite side of the mill facing the saw and looking at the front/radiator end of the engine sitting there when you crank the engine it turns clockwise and so does the saw.

Just so you know not all engines turn counter clockwise standing at the flywheel end. I got a deal on a 671 from a dealer who said it had been sitting around cause it "ran backwards" and no one wanted it. When he delivered it and I set it down on the ground next to the mill, his comment was the engine turns the right way for your #$%&*! mill. I told him you where the one who said it "ran backwards" I never said it was wrong for my application. He just laughed and said, "You are right".
My wife said I collect junk, I told her I am a amateur industrial archaeologist just trying to save valuable artifacts.

Offline whitepine2

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Re: Belt pully to pto?
« Reply #5 on: September 14, 2015, 10:12:34 PM »
 
Just so you know not all engines turn counter clockwise standing at the flywheel end. I got a deal on a 671 from a dealer who said it had been sitting around cause it "ran backwards" and no one wanted it. When he delivered it and I set it down on the ground next to the mill, his comment was the engine turns the right way for your #$%&*! mill. I told him you where the one who said it "ran backwards" I never said it was wrong for my application. He just laughed and said, "You are right".
 71's can be made to run  several ways front to back,CC,CW buses turned backwards as
well as some in boats with two power plants one CC one CW.

Offline 1wkinsley

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Re: Belt pully to pto?
« Reply #6 on: September 14, 2015, 10:33:55 PM »
Thanks for the advice everyone. When trying out different pulleys how do i know when I am at 540 rpm?

wynn

Offline redprospector

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Re: Belt pully to pto?
« Reply #7 on: September 14, 2015, 11:17:47 PM »
Engine RPM x drive pulley diameter / driven pulley diameter = shaft RPM.
1800 RPM x 6" / 20" = 540 RPM.
I just pulled those numbers out of thin air, so your mileage may vary. But that is the formula.  ;)
1996 Timber King B-20 with 14' extension, Morgan Mini Scragg Mill, Fastline Band Scragg Mill (project), 1973 JD 440-b skidder, 2008 Bobcat T-320 with buckets, grapple, auger, Tushogg mulching head, etc., 2006 Fecon FTX-90L with Bull Hog 74SS head, 1994 Vermeer 1250 BC Chipper. A bunch of chainsaws.

Offline 1wkinsley

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Re: Belt pully to pto?
« Reply #8 on: September 14, 2015, 11:22:03 PM »
Thanks, why must I keep running at 540 rpm?

Offline beenthere

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Re: Belt pully to pto?
« Reply #9 on: September 15, 2015, 12:15:51 AM »
Your circular saw blade is likely hammered for that rpm.
south central Wisconsin
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Offline 1wkinsley

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Re: Belt pully to pto?
« Reply #10 on: September 15, 2015, 08:26:40 AM »
I am getting my blade hammered next week. Is 540 a good rpm or should have it hammered to something greater.

wynn

Offline snowshoveler

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Re: Belt pully to pto?
« Reply #11 on: September 15, 2015, 11:27:09 AM »
In the Forum tool box there is a calculator for pulley sizes and speeds. It will give you everything you ever wanted to know about pulleys and speed.
I just finished doing what you are going to do.
I turned my engine so the radiator is toward the mill. A jackshaft runs beside the engine.
I used the toolbox calculator to size my pulleys and things work awesome now.
I even managed to hook up my 4 side planer now that the pto is accessable to it.
Regards Chris 
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Offline Possum Creek

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Re: Belt pully to pto?
« Reply #12 on: September 15, 2015, 01:12:49 PM »
 

      This is how I tied a belsaw to a detroit. I also went from 540 rpm to about 630 on the saw. I like it much better this way.   PC

Offline svart ole

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Re: Belt pully to pto?
« Reply #13 on: September 15, 2015, 11:33:09 PM »
As they say, a picture is worth a thousand words.
My wife said I collect junk, I told her I am a amateur industrial archaeologist just trying to save valuable artifacts.


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