Life expectancy of Small Wheel rubber coating?

Joined
Feb 7, 2010
Messages
434
I don't make many knives, and a lot of the ones I do make haven't really called for the use of the set of small wheels I bought. So, the wheels sat on the top of my tool chest, waiting and looking rather lonely.

I'll be the first to admit that they sat there for a long time, so I shouldn't be too surprised by the dry rot. What got me, though, was the spontaneous self-destruction when put on the grinder. While I could see that the smallest was completely shot, the thin rubber spider-webbed with cracks, the larger one looked perfect. As soon as it got up to speed and I put the knife to it, boom. Belt ruined and huge chunks of rubber missing from the wheel.

I'm not blaming the manufacturer or looking for free replacements, but I am a bit concerned about replacing the wheels. By my count, I have 7 smaller wheels, 2" or less, that rotted while waiting on the sidelines. That's a pretty sizable investment that I'm somewhat hesitant to make again.

Anyone else see this? Is there some special care that I should be giving the wheels while this sit? Armorall once a month?

My shop isn't climate-controlled, but it is large enough that sunlight doesn't reach in. The wheels were stored on a self, in the dark, to collect dust until I needed one. Years passed, sadly, and I kind of forgot they were there. Still, a year or two without use and they're dead?

How long have yours lasted? Any special stuff you do to keep the rubber soft and attached to the spindle?

Would you recommend all-steel small wheels? How do you deal with the belt bump?
 
I haven't had any issue with the larger small wheels that I've got that are I think poly coated, but the really small one 1/2" rubber coated one has cracks all in it. Still works fine though. Maybe 5 years old? I didn't use it much for the first couple of years either.


I'm sure you know you need to run these at low speed though, the smaller the wheel right?



Sunray will re-coat the cores for you if you keep them. Same with all contact wheels, cheaper than buying new ones in most cases, although maybe not in the case of small wheels. Not sure. If you don't re-use them, let me know, I'll give you a few bucks for the cores.



You definitely don't want steel small wheels. The rubber handles abrasive wear from the belt grit, and cushions the work so you don't get tons of chatter. Personally, I'm considering getting some softer wheels made than available for this reason. All steel would leave a horrible finish and wear unevenly quickly. As far as belt bump it shouldn't be much of an issue with quality belts and a steady hand. Recommend the X weight belts of good quality or if you already buy a lot of jflexes get the blue hermes jflexes they've got a better splice than the yellow klingspor belts.
 
I haven't had any rubber degradation issues with my small rubber wheels, yet. I've had them for about 3 years. I have had a small 1/2" wheel fail due to bearings but not the rubber. I run them slowly. My garage is detached and not temp controlled. After use, I clean them and store them inside a tupperware container.
 
Rubber degrades pretty rapidly in the presence of ozone. If they are stored near electrical motors or any other ozone generating source, they dry rot pretty quickly.
 
Are you hitting the rubber with solvent like wd40 or oil, acetone something like that.

Oh, no. I wasn't sure how the material would deal with anything, so I just dusted them off with a soft brush before use. Otherwise, they sat on the shelf, well away from anything like solvents.

Everything about them looks like your standard, run-of-the-mill dry rot. The only real worry is that the wheel that disintegrated while running was perfectly fine to the eye and had no signs of a problem.

I'll try to remember to snap some photos when I go back out to the shop today.

Hate to think that these things have a shelf-life considering how much they cost!
 
Back
Top