Could someone 3d print me a gear?

[LeanMachine]

So i bought an old electric meat grinder a while back for very cheap because it had a stripped gear. Upon disassembly i found that someone had dropped one of the cover bolts into the gear box, which obviously bound things up. The small gear on the motor was made of phenolic and i assume was designed to fail in such an event. The grinder is a stimpson. Never heard of it? Yea neither has the internet. I have searched high and low for a replacement gear but can hardly even manage to find mention of the grinder at all. One could plausibly find a generic gear somewhere that would work but i have not had any luck.

So my question is would a 3d printed gear hold up? It is the fastest spinning gear in the gear box. Torque is then stepped up through 3 or 4 more large gears.

The broken gear is only about 1.5"x 1" and has 24 teeth. I could supply all of the measurements and pitches. Is something like that very time intensive to draw up to be printed? Estimate cost?

Are there any free programs that i could use to draw it up?

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[steve morton]

Might look in W. W. Grainger catalog.

[wes122984]

i got a printer but not good at drawing things up. can use google sketchup for free and there are a few free gear generators out there.

[dogcatcher]

Check with the local library.

[Texas Grown]

Lots of different types of materials that can be used also.

[CabezaBlanca]

A machine shop should be able to help you out pretty easy. Might cost a little more than what you want to spend though.

[LeanMachine]

A machine shop should be able to help you out pretty easy. Might cost a little more than what you want to spend though.

You aint kidding. I got quotes from several places. All are $275-300. Im in the wrong line of work. I figuree a place that specifically makes gears would be so jigged up that they could make such a small gear very easily. Not the first time ive been wrong.

Our local library does have a 3d printer. I will probably try to go that route. Once i draw it up i can print as many as needed and with various materials if needed.

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[Texas Grown]

Look into one of the distributors for "Martin Sprocket & Gear". Lots of independent distributors. I use to work at the home facility back in the 1980s. They had 17 plants and warehouses here in the U.S. back then. Not sure what they have now. But are known world wide. They make all kinds of gears and sprockets of any type. And various materials for all industries. Anything gear or sprocket related, they have a source for it. Except maybe 3-D printing. But I wouldn't put it past them for having such tech now.



They are also an employee owned company.

[dogcatcher]

Since it is not metal, you can probably fashion one using HDPE. That can be worked on a wood lathe, the actual gears, drilled and cut, then filed in place. Recycle 2 code is HDE, milk cartons, look how to melt and make a block. I have done gears out of it, tough, but not always the answer, I used a drill press, files and coping saw.

[LeanMachine]

Since it is not metal, you can probably fashion one using HDPE. That can be worked on a wood lathe, the actual gears, drilled and cut, then filed in place. Recycle 2 code is HDE, milk cartons, look how to melt and make a block. I have done gears out of it, tough, but not always the answer, I used a drill press, files and coping saw.

I actually did a trial run out of oak. Drew a presise template and cut the helical geara with the band saw table tilted to the appropriate angle. It fit and could be turned by hand but immediately sheared the teeth under power. Id be afraid hdpe would do the same since it has no reinforcement. But i do have a sheet of it from other projects. But i also have a sheet of phenolic i could laminate up. The hdpe would be easier to work but the phenolic would def hold up since thats what the original was.

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[TXRebel]

Is the gear broke or just the teeth stripped off?

https://www.instructables.com/id/Broken-Gear-Repair/

[LeanMachine]

Is the gear broke or just the teeth stripped off?



https://www.instructables.com/id/Broken-Gear-Repair/

All teeth are stripped off. I actually tried that technique but it was not strong enough. Could probably get by if it were just one or two broken teeth.

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[dogcatcher]

If you have a drill press and patience, lots of PATIENCE, I would go to the scrap metal dealer and find a piece of aluminum. Paint it with Dykem, mark it. Drill holes in the "valley" of each gear tooth. Then using a jeweler's saw cut the gears and basic diameter. To mill the correct thickness, lay a sheet of 80 grit sand paper and CAREFULLY sand it to the correct thickness. Clean it all up with a files.

I have done this both ways, the HDPE and the aluminum gears. It takes time, if you get satisfaction out of doing stuff like this, go for it. If not, trash it and get another one. Doing stuff like this is not for everyone.

[LeanMachine]

If you have a drill press and patience, lots of PATIENCE, I would go to the scrap metal dealer and find a piece of aluminum. Paint it with Dykem, mark it. Drill holes in the "valley" of each gear tooth. Then using a jeweler's saw cut the gears and basic diameter. To mill the correct thickness, lay a sheet of 80 grit sand paper and CAREFULLY sand it to the correct thickness. Clean it all up with a files.

I have done this both ways, the HDPE and the aluminum gears. It takes time, if you get satisfaction out of doing stuff like this, go for it. If not, trash it and get another one. Doing stuff like this is not for everyone.

The dykem is a good idea. I was using a glued on template and they get all furred up on the edges and you lose fine detail. The gear is about an inch thick. I considered using like 1/8 or 1/4" aluminum, getting them close to shape, then laminating them together and refining. I have some high end epoxy for building bows. Just seems it would be easier to shape the thinner pieces rather than full thickness. Of course then you have to make significantly more cuts overall.

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[Bill]

I Googled “stimpson meat grinder gears” and got multiple hits. What model is it?

I’m guessing you can find one.

Do you have a picture of the bad gear? For example I found:





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