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Jul 21st, 2025 | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | I have a old cast iron pulley for my air compressor with some pretty deep rust pits in the sides of the "V", and I'm concerned that a belt will not last very long or it may slip.
Don't want to remachine it because that would change the size of it, and there's not a lot of extra to play with.
So I plan to sand blast the inside really good to both finish cleaning it and give some tooth for something to stick to it.
The question is what do I use to repair it/fill in the rust pits? Something like JB weld, or?? I was planning on some "magnum steel" that I've had one the shelf for 5 or 10 years, but it's rock hard and in the trash now..
So now that I have to order something or make a trip to the store what do I need to find, and where do I find it?
Then I'll chuck it in the lathe to clean up the extra and just skim and true the surfaces.
Thanks,
Grigg | | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Grigg,
Dig around for Devcon products. They are professional grade and come in small containers, perfect for what you have planned. A Bearings Inc, Applied Industrial or some other industrial supply house should have them
Stuart | | | | | Joined: Feb 2004 Posts: 28,675 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,675 | Use some Devcon Epoxy Steel, after you've beadblasted the pulley and thoroughly cleaned all the glass beads away. I use massive amounts of high-pressure air through a needle-tip blow gun to make sure there's no residue of glass beads in the pitted spots. If any are left, they act like tiny ball bearings and keep the filler from getting a grip. Follow the mixing and application directions to the letter. Epoxy steel is like J-B Weld on steroids.
Jerry
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| | | | | Joined: Nov 2001 Posts: 1,516 'Bolter | | 'Bolter Joined: Nov 2001 Posts: 1,516 | I was going to suggest JB weld,,but it looks like Devcon Epoxy is superior.
Ive never dealt with Devcon, is it available "off the shelf" like JB is?
Sounds like something i need for my toolbox,and vehicle toolbags. | | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | I'll find some "Devcon Epoxy Steel" and give it a try, I've heard of it and that it's supposed to be great stuff, but never used any.
Devcon offers a lot of different choices. I've narrowed it down to "Plastic Steel" but do I want the putty or the liquid? Either way one pound cost about $35.
Thanks,
Grigg
Last edited by Grigg; 01/13/2009 5:16 AM.
| | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Grigg,
The Plastic Steel in liquid would need to be dammed or it would run just like thick honey. The putty is just what it says...thick and applied with a putty knife, it won't run or creep.
Loctite has a Fixmaster Epoxy that is a A&B combined in a stick. You pull out a hunk and knead the two components together, then apply it with a putty knife...it's $11.00. If you have only a few big divots to fill maybe this cheaper package amount would be the ticket. Loctite is quality stuff too.
Stuart
| | | | | Joined: Apr 2005 Posts: 275 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 275 | Grigg, You can buy a 1 oz. tube of Devcon for $5 or $10 at a good hardware store.
Doug | | |
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