2021 - Volume #45, Issue #5, Page #18[ Sample Stories From This Issue | List of All Stories In This Issue | Print this story | Read this issue]
540 Pto Converted To 1,000 Rpm
“I used a jackshaft and a combination of pulleys that let me gear up the pto speed for the chipper,” says Negen. “The same drive belt is used for the chipper and the generator.”
Getting the right pulleys in place was easy for Negen. “I turned the problem over to my engineer son in Michigan and told him to figure it out,” says Negen. “He put the formulas together, and I followed them.”
He wanted the best fuel economy when running the equipment. The Kubota normally runs full throttle at 2,640 rpm. The pulley combination lets him idle it down to around 1,800 while still achieving the right speed for both attachments.
Following his son’s formulas, Negen mounted a 12-in. driveshaft to the pto drive and ran a belt to a 4-in. drive pulley on a 1-in. jackshaft. An 11 1/2-in. pulley at the other end of the jackshaft drives a 7 1/2-in. pulley on the chipper. He put a 3-in. pulley on the generator to be driven by the same belt as the chipper.
The frame the generator slides onto is made from square tubing to match the original frame of the chipper. The mount is made with salvaged 1-in. tubing and angle iron. The angle iron base on the generator slides into the mount.
Negen hinged the generator to its base to make the drive belt self-tightening. A spring-loaded pulley keeps tension on the drive belt from the pto shaft and on the belt to the chipper.
“I have a little slippage on that first belt,” says Negen. “I went with a 1/2-in. belt, but I think a 5/8 would have been better when the generator is under load. It can stretch when it is driving 6,000 volts with that 9,000-volt generator.”
Negen designed the slip-out mount for the generator so he could remove it when using the dust producing wood chipper.
Adding the various attachments to the same base has been interesting, but Negen admits he wouldn’t do it again.
“I would just put the generator on its own cart,” he says. “I only get the chipper out every few years, plus I have to take the bearing off the chipper to remove the belt. I could avoid that completely.”
Contact: FARM SHOW Followup, Anthony Negen, 88504 200th St., Sacred Heart, Minn. 56285 (ph 320 444-0723; firstname.lastname@example.org).
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