bmw57isetta
Well-known member
Howdy from Austin, Texas! I bought a late '50's Craftsman Model 150 floor standing drill press (103.24530) a few months ago and have dismantled the whole thing and rebuilt the press part of it. Thanks to all of you that have taken the time and effort to take pix of your C'Man DP projects, explain how you did it and post them here. They've all been a huge help! Might help to throw out kudos to a couple of folks over on owwm.net as well.
I've now started on the motor. a matching 1/2 hp Craftsman/Packard Electric model 115.19870. I started with the lower bell, cleaned it, painted it and pulled the lower bearing off. While the motor sounded smooth when you started it the bearing felt like it was full of gravel when out of the motor. 55 years worth of service and time to replace. Today, I bought two new 6202ZZ sealed roller bearings from the top bearing outfit in town. They're the same folks that supplied the upper and lower bearings for the front pulley shaft that fit like a glove. The original bearing I pulled out was an MRC 220 SFF-4 which crossed over the the 6202ZZ-5/8. This thing slides down the upper part of the shaft but just will not go over the slight taper to its final resting place. I put it in the freezer for an hour (worked like a champ on the pulley bearings) but no go. Heat gun didn't phase it either.
Using a digital micrometer (same one the vendor used) at home, I get the following measurements:
Original ID=.0627
New ID=.0623
Shaft OD=.0626
At face value, the math works for the old bearing but is that .0004 delta between the old and new the problemo or am I going to have to take this thing to someone with a hydraulic press? I don't recall reading about anyone that wasn't able to do this on their workbench.
Bottom line, did I get the wrong bearing? I've seen reference to a 6202ZZ-16 (mm). Is that the one I really need? Anyone done this without all the hassle and log the correct bearing number? Or is this just a wake up call to how it's done? If I've overlooked any pertinent info, please let me know.
You're input will be much appreciated ... Bruce Fullerton / Austin, Texas
I've now started on the motor. a matching 1/2 hp Craftsman/Packard Electric model 115.19870. I started with the lower bell, cleaned it, painted it and pulled the lower bearing off. While the motor sounded smooth when you started it the bearing felt like it was full of gravel when out of the motor. 55 years worth of service and time to replace. Today, I bought two new 6202ZZ sealed roller bearings from the top bearing outfit in town. They're the same folks that supplied the upper and lower bearings for the front pulley shaft that fit like a glove. The original bearing I pulled out was an MRC 220 SFF-4 which crossed over the the 6202ZZ-5/8. This thing slides down the upper part of the shaft but just will not go over the slight taper to its final resting place. I put it in the freezer for an hour (worked like a champ on the pulley bearings) but no go. Heat gun didn't phase it either.
Using a digital micrometer (same one the vendor used) at home, I get the following measurements:
Original ID=.0627
New ID=.0623
Shaft OD=.0626
At face value, the math works for the old bearing but is that .0004 delta between the old and new the problemo or am I going to have to take this thing to someone with a hydraulic press? I don't recall reading about anyone that wasn't able to do this on their workbench.
Bottom line, did I get the wrong bearing? I've seen reference to a 6202ZZ-16 (mm). Is that the one I really need? Anyone done this without all the hassle and log the correct bearing number? Or is this just a wake up call to how it's done? If I've overlooked any pertinent info, please let me know.
You're input will be much appreciated ... Bruce Fullerton / Austin, Texas
