Introduction: Broken Gear Repair
Simple way to fix broken gear
Step 1: Materials Needed to Fix Broken Gear
you need a plastic steel epoxy, Popsicle stick, any mixing medium for your epoxy mixture and brush and detergent soap or dish washing liquid.
Step 2: Cleaning
Be sure that your gear is free from oil and dust. use dish washing or powdered soap and brush to clean the gear
Step 3: Epoxy Mixture
mix the two compound and apply it on the broken area.
Step 4: Curing
wait for an hour to harden the epoxy, since the epoxy is not hard enough and the epoxy is flowing slowly, you need to monitor the flowing or moving of the epoxy not to stuck in one area of the gear
Step 5: Moulding the Teeth
After an hour the resin will going to be hard, just like a clay, position the new mold gear in its gear partner, then rotate slowly to adapt the teeth of the other gear by the way you need to put some grease on the other gear so that the epoxy will not stick to the other gear. rotate it slowly till the rotation will fit to each gear.
Step 6: Total Curing
remove the gear to the gear box assembly and cure it on a well ventilated area for a day
Step 7: Cured Epoxy Gear
Install the hardened gear in the gear box, assemble the parts. this gear part belongs to my meat grinder.
101 Comments
Question 2 years ago on Step 7
Can you use any two-part epoxy, or must it be plastic steel?
2 years ago on Introduction
Worked a treat, thankyou for taking the time...
2 years ago
Did this repair about 30 years ago with a VCR. this is not the best way to do it. I took a template from the good half of the gear with some chewing gum, than put it in the fridge for couple of hours, moved the gum, now hardened, on the broken side and filled the space with resin.
8 years ago on Introduction
Perfect. What if gear is from steel ??
Reply 3 years ago
Well, they do call it "Epoxy Steel" :)
Tip 3 years ago
https://youtu.be/Tlmr-0NtqkQ
8 years ago on Introduction
Well done, thank you very much. I will keep this in mind for future gears.
Reply 4 years ago
They make steel stick epoxy at home depot that would probably work very well on a metal gear only much less time to set up. You would have to work fast like three to five minutes. It can be drilled and tapped as well.
5 years ago
Great! Will now use your idea for other "problems" and repairs I work on. Thank you.
5 years ago
You just gave me a temporary fix for my RC. I gunned it one too many times, and the gears tore themselves apart. The Chinese boat arrives in a week. I only have to wait a day and Revvor'll be out, skidding in the warehouse or streaking along the road.
Reply 5 years ago
sooo yeah. thanks.
5 years ago
I would like to make a mold of the finished gear in case there is another breakdown. Can someone tell me what kind of silicon or other material is used to make molds? Friends in Scotland were making molds of fancy wooden objects when doing a makeover on older homes but I don't know what they were using.
Tedward2
6 years ago
For a long-term replacement, make a mould from the repaired item, then use that to cast a new one-piece item, free from the risk of an add-on section breaking away.
6 years ago
Use very thin plastic sheet, saran wrap instead of the grease.
7 years ago
прекрасно, спасибо.
7 years ago
I wish I saw this earlier... :)
Thanks. I'll keep this in mind.
8 years ago
I used your idea and repaired a worn gear on a powered lift chair. It worked out great, saved me spending $200 on a new motor/gearbox since I couldn't just order a new gear. Thanks.
8 years ago
I did this on my kids powerwheels Jeep. The gear appears to be identical to the one used in this instructable.... WELL DONE SIR!
8 years ago on Introduction
Thumbs-up on that one! The skill quotient involved leans heavily towards that of "timing" and its due, requisite attention.
8 years ago on Introduction
Thumbs-up on that one! The skill quotient involved leans heavily towards that of "timing" and its due, requisite attention.