[AT] 540 to 810 PTO Gearbox?

[william.neff.powell at comcast.net]

I have seen many types of 3pt stump grinders. The "Worksaver" design seems the most common among those companies that manufacture 3pt grinders. 

http://www.wikco.com/stump.html

Similar to the "Woods", here's one on Craigslist.

http://westmd.craigslist.org/grd/688601716.html

The "Stumper" seems like the simplest design, but it would require a huge cutting wheel which I feel would be unsafe to fabricate. Plus, I don't like lateral forces on the hitch. 

http://www.stumper3500.com/tractor_stumpgrinder.html

And here is another design, "Ashland Stump Master" similar to the Stumper. 

http://www.ashlandind.com/Partsmanuals-acrobat/SC-15%20ver4-04.pdf


But, before I start, if I design my own stump grinder, based off of an existing design, not for resale but solely for my use, am I in danger of infringing on a patent? (If the item I am creating is patented). 

Regards,

Will Powell


 -------------- Original message ----------------------
From: "George Willer" <gwill at gwill.net>
> Will,
> 
> The gearing will reduce your torque but will have almost no effect on
> horsepower because it increases speed accordingly.  Remember, Horsepower is
> torque multiplied by speed.
> 
> I have no idea how to build a stump grinder.
> 
> George Willer
> 
> > -----Original Message-----
> > From: at-bounces at lists.antique-tractor.com [mailto:at-
> > bounces at lists.antique-tractor.com] On Behalf Of
> > william.neff.powell at comcast.net
> > Sent: Wednesday, May 21, 2008 1:07 PM
> > To: Antique tractor email discussion group
> > Subject: Re: [AT] 540 to 810 PTO Gearbox?
> > 
> > Charlie,
> > 
> > OK, 1 to 1.5 makes sense. Found this one at Northern Tool + Equipment:
> > 
> > 
> > http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_2003315
> > 16_200331516
> > 
> > Says 75hp which should cover anything I want to attach to it. Probably use
> > my D17.
> > 
> > Stump grinders I have seen on-line say gearbox rated at 60hp, minimum hp
> > needed is 22. I believe my D17 is 50 so I should be good.
> > 
> > If I ever start/finish it... I do have most of the pieces already,
> > hydraulics, metal, pto shaft... Just need to think about flywheel and
> > boucoup safety covers.
> > 
> > Regards,
> > 
> > Will
> > 
> > 
> > 
> > 
> >  -------------- Original message ----------------------
> > From: "charlie hill" <chill8 at suddenlink.net>
> > > Will you need to step it up by 50% so you'll need a 1 to 1.5 step up
> > box.
> > > Be warned that you are cutting your torque way down so if the stump
> > grinder
> > > requires 30 hp you  might need a 50 or 60 HP tractor.
> > >
> > > Charlie
> > >
> > > ----- Original Message -----
> > > From: <william.neff.powell at comcast.net>
> > > To: "Antique tractor email discussion group" <at at lists.antique-
> > tractor.com>
> > > Sent: Wednesday, May 21, 2008 8:48 AM
> > > Subject: [AT] 540 to 810 PTO Gearbox?
> > >
> > >
> > > > Hello,
> > > >
> > > > Where can I find a 540 to 810 PTO Gearbox?
> > > >
> > > > Thinking about fabricating a stump grinder and that seems like the
> > > > standard gearbox for the commercial 3pt PTO stump grinders.
> > > >
> > > > Regards,
> > > >
> > > > Will Powell
> > > >
> > > > _______________________________________________
> > > > AT mailing list
> > > > http://www.antique-tractor.com/mailman/listinfo/at
> > >
> > > _______________________________________________
> > > AT mailing list
> > > http://www.antique-tractor.com/mailman/listinfo/at
> > 
> > _______________________________________________
> > AT mailing list
> > http://www.antique-tractor.com/mailman/listinfo/at
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
> _______________________________________________
> AT mailing list
> http://www.antique-tractor.com/mailman/listinfo/at