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OT optimal cutting speed and feed rate for lawn mower blades?

Point of reference: I'm working on my Deere z950m with 72 inch deck today. PTO sheave about 5.5 inch pitch diameter at 3600 rpm rated, blade spindles about 7.5 inch pitch diameter. Blades are about 25 inch diameter. Works out to 17278 feet/min tip speed.
 








 
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