Building my own Rotary mower?
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Re: Building my own Rotary mower?
Re: Building my own Rotary mower? -- Diesel	Post Reply	Top of thread	Forum

Posted by: randykimball ® 08/27/2007, 10:16:24 Author Profile eMail author Edit

The only help I have is that you may can view a brush hog and see at what ratio the PTO turns the blades. Then calc the size of the blades to that and get a figure that you can compare with. To do this you may need to rotate the input shaft of the hog and count resultant turns. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

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Re: Re: Building my own Rotary mower?
Re: Re: Building my own Rotary mower? -- randykimball	Post Reply	Top of thread	Forum

Posted by: Diesel ® 08/29/2007, 15:40:00 Author Profile eMail author Edit

Hey Randy! That worked well! I measured another brush hog and that one is 1:1.5 ratio from the pto shaft to the blade turning. Thanks

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Re: Re: Re: Building my own Rotary mower?
Re: Re: Re: Building my own Rotary mower? -- Diesel	Post Reply	Top of thread	Forum

Posted by: randykimball ® 08/29/2007, 16:16:08 Author Profile eMail author Edit

Diesel, you are more than welcome... thank you for the feed back... it is good to know I'm good for SOMETHING. In cases like this it is smart to often take a look at the wheel and all the work that went into it, then just put all that work into your project without re-inventing the darn thing. ...Meaning, someone spent some prototype evolutions developing a brush hog that works. So they already did the how many RPM to what length of blade brain pain. The thing is to be wise enough to do this without becoming trapped in the box. I generally look around mentally at what is similar, process that, then do my own thing based on the similar thing as a tool for a mental processes base line. One reason for my method is productivity. If you use modern solid CAD systems and you throw a working but needs tweaked gagdet onto the screen and reshape, resize, lighten, strengtn... and so on... you soon have a brilliant totally new improved gagdet that accomplishes the assignment. The magic is in the fact that the starting gagdget was just a mind teaser and it got you past any mental grid lock before it had a chance to happen. The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. Modified by randykimball at Wed, Aug 29, 2007, 16:18:33

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Re: Re: Building my own Rotary mower?
Re: Re: Building my own Rotary mower? -- randykimball	Post Reply	Top of thread	Forum

Posted by: Diesel ® 08/27/2007, 16:51:28 Author Profile eMail author Edit

Thanks Randy, I will try that. It may not be completely accurate but, it's better then not having any idea. Thanks again

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Re: Re: Re: Building my own Rotary mower?
Re: Re: Re: Building my own Rotary mower? -- Diesel	Post Reply	Top of thread	Forum

Posted by: fluidpower1 ® 08/27/2007, 21:47:46 Author Profile eMail author Edit

I would think Blade Tip Speed would be the thing to look at. There must be a range of speed that the blade tip, which does all the cutting, works best at. Think of your yard mower with a 21" blade at 2000-3600 RPM at full theottle and calculate how fast the cutting edge is moving. Greater diameters must turn slower to get the same results. If you've ever been around a Bush Hog it sounds like the blade is turning rather slowly in relation to a 21" lawn mower. In other words check a mower with a blade length the same as you plan to use.

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