The other day I was cutting up some pen blanks on the bandsaw and the blade broke. It was a 3/4” Timberwolf blade that I had welded up and it had been running noisy and had a wave movement toward the front as it went around. I had figured that it has a crack in the blade at the weld and was going to fail, but I had kept using it.
So it broke. I took the covers off and removed the blade. It broke about 1/4” away from the weld. So I coiled it up figuring I’ll clean it up and reweld it again the next time I need some more blades. The blade is sharp and was cutting great, it was probably just a little shift in the jig as I was welding it the first time.
So I was cleaning up the wheels in preparation of putting on a new blade.
When I went to spin the top wheel it seemed a little slow in it’s spin. I looked at the bearing and it looked ok, but I tool off the top nut from the spindle and removed the upper wheel.
The outside bearing spun freely, but the inside bearing couldn’t be turned by my fingers. I put the upper wheel over an open vise and tapped the bearing out with a dowel. It popped out easily. The bearing looks good, the shaft on the bandsaw looks good, but, the bearing doesn’t turn. I measured the shaft – 15MM and the outer Bearing surface 35MM.
I went to my favorite bearing supplier, eBay and looked up the bearing number 6202Z. The bearings were 4.95, 7.95 or 13.59 for a quantity 10. So I bought the quantity 10. I needed 2 and possible the lower shaft on the drive wheel may use the same bearing. I’ll check that out when I put the upper together and reassemble. I’ll turn the motor on with no blade and listen for any bearing noise.
I put a long screwdriver on the bearing race and the handle by my ears and the sound is amplified so you can tell if everything is OK.
The fun of woodworking tools.
Little clue when you change blades, spin the wheels and also the bearing on your blade guides if you have bearings there and make sure that everything spins OK.
Another interesting point. I don’t think I’ve ever seen a bearing number with two different measurements before. But, on eBay I found the bearing number with two different sizes. One with 16MM bore and 1 with 15MM bore they were labeled as 6202ZZ on both. The ones that I bought also had a label of 6202Z.
When ordering bearings check your measurements. I took the bearing out of the wheel so I could check the outside measurement. The shaft measurement is a little under the 15MM by 0.01MM so it slips on and is not a press fit on the shaft. Also make sure that the bearings have dust shields. Some bearings are open and they will get packed with dust inside. Others have a dust shield on only one side. So make sure you get what you want and need.
-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware firstname.lastname@example.org †