Posted: 9/30/2025 10:07:07 AM EDT
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I’m trying to help a friend get her old manure spreader working. The worm gear, the bigger driven gear, has worn teeth so bad that it doesn’t engage the worm any longer. I have exhausted looking for a replacement. Can anyone here make a replacement for not a lot of money? Attached File Attached File Attached File |
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Just to make sure, did you check here? https://www.mcmaster.com/products/gears/worm-gears-2~/ |
9 lives - 9 pellets... Coincidence?
| As bad as the gear looks the worm is probably shot too. The worm is usually harder than the gear but that looks so bad it must have had dirt in it so I bet the worm is compromised. |
Life's battles don't always go to the stronger or faster man. In the end, the one who wins is the one who thinks he can! - SCI, NRA
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Team Ranstad
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The worm isn’t great but I think it’s usable. The gear looks like cast iron so pretty soft. Yes I checked Mc Carr. Nothing this big was listed. Apparently this gear is the weak point in the gearbox so used ones are not available. Replacement parts are not available as this spreader is about 60 years old. The rest is in good shape, just this bad gear. |
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AZ, USA
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OP, did you check Misumi? Worm Gears |
If your "conservative principles" are just to do whatever it takes to not anger leftists and tyrants, your neither principled, nor conservative-M70_Rifleman
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Did you check boston gear? https://www.bostongear.com/ Boston gear They might have it or may have made the originals. It's probably pretty easy to cut that gear on a lathe or shaper. Neither of my lathes or my shaper is setup since the move. Well nothing is really accept the welder and 30 ton press. Also if you can find someone with a gear hobber. Check vintage machinery dot com. You have the original so it's a easy gear to cut if someone has the machines. Best of luck I love restoring old hit & miss engines, tractors, and well about anything with a motor or moving parts that is antique. |
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Originally Posted By OTHP: Did you check boston gear? https://www.bostongear.com/ Boston gear They might have it or may have made the originals. It's probably pretty easy to cut that gear on a lathe or shaper. Neither of my lathes or my shaper is setup since the move. Well nothing is really accept the welder and 30 ton press. Also if you can find someone with a gear hobber. Check vintage machinery dot com. You have the original so it's a easy gear to cut if someone has the machines. Best of luck I love restoring old hit & miss engines, tractors, and well about anything with a motor or moving parts that is antique. Worm gears are different, you can't cut them on a shaper or regular hobber. You have to use a rotary gear cutter specific to the pressure angle and radius of the worm to insure proper engagement. I've cut them on a Bridgeport with the head tilted to the proper helix angle while holding the blank in a dividing head, they are tedious parts to produce. |
Life's battles don't always go to the stronger or faster man. In the end, the one who wins is the one who thinks he can! - SCI, NRA
Team Ranstad
Team Ranstad
|
Originally Posted By TinSpinner: Worm gears are different, you can't cut them on a shaper or regular hobber. You have to use a rotary gear cutter specific to the pressure angle and radius of the worm to insure proper engagement. I've cut them on a Bridgeport with the head tilted to the proper helix angle while holding the blank in a dividing head, they are tedious parts to produce. Originally Posted By TinSpinner: Originally Posted By OTHP: Did you check boston gear? https://www.bostongear.com/ Boston gear They might have it or may have made the originals. It's probably pretty easy to cut that gear on a lathe or shaper. Neither of my lathes or my shaper is setup since the move. Well nothing is really accept the welder and 30 ton press. Also if you can find someone with a gear hobber. Check vintage machinery dot com. You have the original so it's a easy gear to cut if someone has the machines. Best of luck I love restoring old hit & miss engines, tractors, and well about anything with a motor or moving parts that is antique. Worm gears are different, you can't cut them on a shaper or regular hobber. You have to use a rotary gear cutter specific to the pressure angle and radius of the worm to insure proper engagement. I've cut them on a Bridgeport with the head tilted to the proper helix angle while holding the blank in a dividing head, they are tedious parts to produce. Yet very easy with the right machine and tooling. Unfortunately, the people that spend that kind of money on a machine, aren't generally interested in producing one piece. |
9 lives - 9 pellets... Coincidence?
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Originally Posted By paul463: Pictures of the whole gear box with dimensions and I bet you could find something that could be made to work. There are a LOT of used worm gear drives out there in the world. And new ones. If you start looking for sets instead of one specific gear, it opens up a lot more options. |
9 lives - 9 pellets... Coincidence?
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Originally Posted By Minerk: Might be better off finding a different gearbox. Don't discount this OP. It looks similar to a center pivot/irrigation gear box size. https://directpivotparts.com/products/umc-universal-gearbox?srsltid=AfmBOorbQmbfsAXc_pSOoHY1l4MRqg3zQO1v0_5TxV-klNe6JP2B8MvE |