JohninCT
Platinum Member
Carl
I would suggest that you try to find an existing cutter wheel or junk machinery wheel/pulley that you can adapt to your project. IMHO this would be easier than trying to build on from scratch (Don't reinvent the wheel so to speak - sorry I couldn't resist!). There has been a lot of discussion about wheel diameter, RPMs, blade tip speed, etc. Again, I suggest you look at existing stump cutter designs for cues on how to build your own. Below are a few sites I found which provide info on wheel diameters and RPMs.
If you take the circumference of the wheel (pi x diameter/12) or (3.1415 x dia in feet) and multiply by RPM you will get the blade tip speed in Ft/min.
You will see that most of these cutters run in the range of 5000 to 7000 ft/min blade tip speed. The exception I believe is the Power Trac cutter. Info on the PT is not that easy to come by, but there is a link below indicating that the 400 series cutter motor is a 3 cu in. At a flow of 8 gpm that puts RPM in the range of 600 RPM. An 18 inch wheel running at 600 RPM would have a tip speed of 2825 ft/min. My experience with my cutter (which is based on a 400 series) was that I thought that the blade speed was a little slow and would be better if made a little faster.
It doesn't matter how you spin the cutter whether hyd motor or PTO shaft, the key elements are blade tip speed and sharp blades.
So, you can start with a blade design and find a suitable motor (and pulley/sprocket system if you choose to go that way) or start with a motor and size the blade to match.
Stump Grinders-BeeLine Stump Grinders-Sales & Stump Grinder Rentals
Stump Grinder - Tractor Mounted
Stump Grinder
Worksaver PTO Powered Stump Grinder
http://www.tractorbynet.com/forums/power-trac/29087-pt-stump-grinder.html?highlight=stump+grinder
I would suggest that you try to find an existing cutter wheel or junk machinery wheel/pulley that you can adapt to your project. IMHO this would be easier than trying to build on from scratch (Don't reinvent the wheel so to speak - sorry I couldn't resist!). There has been a lot of discussion about wheel diameter, RPMs, blade tip speed, etc. Again, I suggest you look at existing stump cutter designs for cues on how to build your own. Below are a few sites I found which provide info on wheel diameters and RPMs.
If you take the circumference of the wheel (pi x diameter/12) or (3.1415 x dia in feet) and multiply by RPM you will get the blade tip speed in Ft/min.
You will see that most of these cutters run in the range of 5000 to 7000 ft/min blade tip speed. The exception I believe is the Power Trac cutter. Info on the PT is not that easy to come by, but there is a link below indicating that the 400 series cutter motor is a 3 cu in. At a flow of 8 gpm that puts RPM in the range of 600 RPM. An 18 inch wheel running at 600 RPM would have a tip speed of 2825 ft/min. My experience with my cutter (which is based on a 400 series) was that I thought that the blade speed was a little slow and would be better if made a little faster.
It doesn't matter how you spin the cutter whether hyd motor or PTO shaft, the key elements are blade tip speed and sharp blades.
So, you can start with a blade design and find a suitable motor (and pulley/sprocket system if you choose to go that way) or start with a motor and size the blade to match.
Stump Grinders-BeeLine Stump Grinders-Sales & Stump Grinder Rentals
Stump Grinder - Tractor Mounted
Stump Grinder
Worksaver PTO Powered Stump Grinder
http://www.tractorbynet.com/forums/power-trac/29087-pt-stump-grinder.html?highlight=stump+grinder
