What adhesive to repair nylon halved pencil sharpener gear?
- posted
4 years ago
What adhesive to repair nylon halved pencil sharpener gear?
Maybe 3M DP8005, but it's not cheap, and the dual tube syringe is meant to be used with a dedicated applicator
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** Doubt there is any glue for Nylon under high stress.** I might be tempted to make a 1mm thick aluminium disc with large hole to fit over the broken gear. Then fasten it with numerous 2mm or 6BA nuts, washers and bolts.
Repaired a few broken plastic things with similar re-enforcing plates.
Worked for years afterwards.
That the item is of low value makes it more rewarding.
.... Phil
Nylon is tough to bond. I've never seen any adhesive do more than support i t's own weight at best.
In any case, the gear is so thin that edge adhesion won't hold even with a suitable adhesive assuming one exists. I've done plastic gears like that b y epoxying a suitable size washer on both sides if you have the clearance. But those were regular plastic. I don't know if that will work on nylon ev en given the large contact area of two washers and epoxy. You can always dr ill through the gear and washer sandwich and pin both sides together. It al so looks like it has tooth damage as well, so if you get it to work it will thump as it rotates as long as it doesn't jam.
Other than that, an old timer with a jeweler's lathe could make one for you out of metal, or if you know a tool maker.
Hi,
I bought a 3D printed replacement gear for my Boston electric pencil sharpener for around $10 on e-bay. Now there are several vendors, and a couple of variations, so you could search e-bay for:
"Boston pencil sharpener gear" and find several choices.
Regards, Tim
Hi,
I bought a 3D printed replacement gear for my Boston electric pencil sharpener for around $10 on e-bay. Now there are several vendors, and a couple of variations, so you could search e-bay for:
"Boston pencil sharpener gear" and find several choices.
Regards, Tim
Is this what you need ?
or
No adhesive will work well for that type of break but cyanoacrylates are supposed to work on nylon.
How does an online pencil sharpener work? Put the pencil into the wifi?
This does not answer your question, but may be the best approach:
Fred
Sometime around Thu, 7 Nov 2019 08:57:26 -0500, Tim Schwartz wrote.....
It probably will not work but I'll try to glue it just once. If that fails, I'll junk it for parts.
To replace the gear I first called Newell Office Company under Exacto in Statesville NC 800-879-4868 but they no longer support the Boston Model 18 Electric Pencil Sharpener 296A so they won't sell a replacement gear.
I assumed it's nylon where it must be a really bad design given that it breaks a lot in the same spot on the net
Like you said there are 3D replacements online I could buy. There's even a "tinkercad" model file
Someone suggest a better brand they like that's better than crummy Boston?
Ten years ago, I had to bond a wire spool to a plastic tub. Both the spool and tub were soft plastics, nylon and polypropylene, respectively. I used this:
For three years, in temperatures from 15- 90 F, the bond held fine and allowed me to wind and unwind wire around the spool. Then, one night, it came apart after I had bumped the assembly against the door heading outdoors. However, for the cost, I felt that the plastic bonder did the job. You can find it just about anywhere, home improvement stores and such. Good luck.
Phil has the winner for me, I have local fastener company, that would find me a washer or two I could work with, but aluminum is so easy to work with, your choice. That said, I have drilled 0.025" holes and placed a 0.025" rod in the hole to put two pieces back together, always used an epoxy with it but wasn't sure the epoxy did much on some of the repairs. Sometimes used two rods in different areas. Buy for this, I like Phil's idea! Mikek
An excellent idea. Probaby will last for 30 years.
We had one where the handle cyclinder fell off, but my mother kept the cylinder and the rivet and I pounded the rivet down a bit and it jst about good as new. I still have it somewhere but I use a knife to sharpen pencils.
Ours didn't even suck in the pencil. You had to push it in. Worked just fine.
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** Guaranteed to work, long as 1mm extra thickness is not an issue..... Phil
I am guessing the tooth damage came first. The repeated hammering each time the tooth skipped, caused the gear to crack.
Maybe JB Weld. (epoxy with thickener) Or Phil A's idea.
George H.
Sometime around Thu, 07 Nov 2019 16:20:46 -0500, micky wrote.....
Thanks to all for the advice for fixing broken plastic gears. Broke with cyanacrylate & decided to give up on the epoxy. Paid $30 at Staples to replace the crappy Boston with Bostich.
Do you know what model your Boston sharpener is? You might try E-Bay. I see various replacement gear prices ranging from $7 to $21.
I also see someone selling a "parts only" model 17 that needs a new gear!
Fred
Sometime around Sun, 10 Nov 2019 22:42:59 -0500, Fred McKenzie wrote.....
It's a Boston Model 18 Electric Pencil Sharpener 296A/ I've never bought nor sold anything on Ebay. I generally disassemble broken devices & keep what's re-usable. Nothing much seems re-usable except the power cord though (and I have a box full of those already).
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