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Tool Talk Discussion Forum

Bed Knife facer??

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Big Ed

03-16-2008 14:15:56




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In an auction lot there was a NEARY bed knife facer.
It ia a grinder type deal attatched to a 4 1/2 inch side grinder. What is it used for??




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Gene Davis (Ga.)

03-16-2008 19:33:50




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 Re: Bed Knife facer?? in reply to Big Ed, 03-16-2008 14:15:56  
Hello there. I deal with the golf course mowers on a daily basis. The bed knife is the part that the reel pushes the grass blade into so that it can be cut. Some reels have a .001-.002 interference matchup. and some use a .001-.002 clerance depending on the make of the reel. The bedknife is simply a stationary barwith a hardened and polished lip turned up and as it wears sometimes it will develop a burr on the leading edge and it hinders a clean cut on greens and tee mowers. Fairway mowers are not a problem. The cut on that grass is so much higher. When the reels get dull you back lap them by turning the reel in reverse with a water soluble 120 grit compound on the blade ends like used on valves. When the burr on the back side of the revolving reel is gone, you have backlapped them enough and it is time to see if there is a burr on the front of the bedknife, if so file or grind it of for best cut of the grass. The height of grass cut is usually from .135 to .550 of an inch, so it has to be a smooth finish to leave a clean cut. At some point in time the bed knife wears out, the reel gets round edged and they have to be reground to specs and do it all again.

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Gene Davis (Ga.)

03-16-2008 19:44:39




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 Re: Bed Knife facer?? in reply to Gene Davis (Ga.), 03-16-2008 19:33:50  
The machine in the picture is used to grind the face of the bedknife truly flat with in a couple of thousands of an inch after you mount it to the bedknife holder so it will be paralell to the reel. If not paralell, the blades on the revolving reel will not register completely across the bedknife and have a surface to cut the grass blade against. After the unit is assembled then you have to be sure you keep the distances even on both ends and middle of the bedknife to assure clean cuts as it wears. Just imagine a sickle bar mower that was out of register with the blade.

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Bed knife

03-16-2008 20:44:20




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 Re: Bed Knife facer?? in reply to Gene Davis (Ga.), 03-16-2008 19:44:39  
My dad sharpened thousands of reel mowers and bed knives. Even taught students how to do it at the college for the turf grass management course. With the old reel grinders ( Foley) it was a real art to sharpen a reel. The new automatic machines (Express Dual) make it way easier but cost over $20,000! I think just a bed knife grinder is over $5000 maybe even $10,000. When properly set up the reel should slice a sheet of newspaper way slicker than a hot knife through butter exactly the same all the way across the width of the reel on every blade. Greens mower reels have 11 blades, I think. In addition to sharpening the reel to cut properly, there also has be the right amount of relieve ground on the reel. Back lapping can prolong the time between sharpening but not indefinitely. Some machines are set up so the reel motors (hydraulic) can turn slowly backwards allowing back lapping without even having to take the reels off. I suppose a bed knife grinder could be used to make any type of precision cutting edge as long as the piece could be clamped properly. The tallest grass a reel mower will cut is up to the half way point of the reel (the axle). My dad sold turf equipment from the 50's till the late 90's. Set many world wide sales records for big mowers. Won a sales award from Toro and got to meet Arnold Palmer (Toro spokesman) on a paddle wheel river boat. Mostly sold Jacobsen and Toro equipment as the main lines but also sold a lot of other equipment as well. He had a 90 % market share because people trusted him and he looked after his customers. He got to the point where he didn't have to call anyone. If they needed a right answer, they called him! He knew his stuff. Both Toro and Jacobsen had specified that where ever he worked, would be the distributor of their products. He owned his own turf business for about 10 years until he had a heart attack. Then he just sold on straight commision. Less than a million in sales was a bad year. This was in western Canada. California dealers will sell 10 million but there are more golf courses in Califronia than all of Canada.

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Bob

03-16-2008 14:27:15




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 Re: Bed Knife facer?? in reply to Big Ed, 03-16-2008 14:15:56  
"GOOGLE" is your friend!

It appears to be a tool for sharpening the stationary knife in reel mowers used on golf courses!



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Bed Knife

03-16-2008 14:49:31




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 Re: Bed Knife facer?? in reply to Bob, 03-16-2008 14:27:15  
That's what it is.



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