Just wanted to start out by saying hi this is my first posting on here. Hopefully more informative and less cockiness then the "professional site". It's always a pissing match over there. Anyways.
I recently purchased a Boyer Shultz h612 challenger. Seems like a good unit for the price. So in my nature I completely disassembled the machine to clean,survey,and replace as needed. Spindle bearing felt gritty so I removed spindle housing. Read up as much as possible to get insight on what was to come. I read a fella made a nice fixture to hold the spindle on the flat just behind the taper so I made that. He also made a 4 pin socket to fit rear nut. I also made that. I had sprayed some pb blaster on a hour or so before. I put my fixture on spindle put the socket on rear nut. Expecting to put some force on it the nut spin right off. Maybe 10 ft lbs to take off. Surprised me would have thought more toque on that nut. Another surprise was instead of two bevel washer back2back like 99% of the people if read had. There are two ground spacers with like 8 pockets on one side each. The pocket faces are facing each other and have springs in each pocket. So it's a spring Assy for preload. Just not what I expected? Hopefully bearings clean up that's the plan.
So I figured I would tear the Boyer Shultz electric motor apart to clean and grease them 45yr old bearings. Their are 6203 z nsk hoover bearings made in USA stamped on them. Going on nsk site they say that a 6203z is shielded one side. Zz is both sides. Mine are both sides with only a single z. My question is can I just put a sealed bearing in its place same specs otherwise.? I want to grease the originals but one shield would get dimpled in the process. And they're cheap enough just replace which I have sealed on the shelf just not shielded. Other than regressed or replace bearings motor looked pristine inside.
As for the grinder I didn't take any measurements yet to see if it's gonna grind flat. It was filthy and I always disassemble every piece I buy to first go through it too see condition and replace or fix anything that's wrong with it. It's also a sickness but 9 1/2 out of 10 times I have something better than original for pennies on the dollar. It's gonna need the bellows for the lead screw so a source of those would be great also. I'm gonna wait to see when I put everything back together and hope for the best on how flat she grinds. Ways look okay. Some flaking still visible but fades closer to operator. The table looks to have hardened ways and the mating surface looks good so fingers crossed. I'm not a big fan of repainting the machine unless your gonna strip off all old and give it what a real paint job deserves. I'm actually a fan of a 100% clean degrease and leave the factory paint. Gives it character to me. Fortunately all my machines aren't abused so scratches and wear marks are minimal.
I'll ty and post some pictures of her when done I haven't looked into loading pictures on the site yet. Thanks in advance for any comments or insight you might have on repairs.
I recently purchased a Boyer Shultz h612 challenger. Seems like a good unit for the price. So in my nature I completely disassembled the machine to clean,survey,and replace as needed. Spindle bearing felt gritty so I removed spindle housing. Read up as much as possible to get insight on what was to come. I read a fella made a nice fixture to hold the spindle on the flat just behind the taper so I made that. He also made a 4 pin socket to fit rear nut. I also made that. I had sprayed some pb blaster on a hour or so before. I put my fixture on spindle put the socket on rear nut. Expecting to put some force on it the nut spin right off. Maybe 10 ft lbs to take off. Surprised me would have thought more toque on that nut. Another surprise was instead of two bevel washer back2back like 99% of the people if read had. There are two ground spacers with like 8 pockets on one side each. The pocket faces are facing each other and have springs in each pocket. So it's a spring Assy for preload. Just not what I expected? Hopefully bearings clean up that's the plan.
So I figured I would tear the Boyer Shultz electric motor apart to clean and grease them 45yr old bearings. Their are 6203 z nsk hoover bearings made in USA stamped on them. Going on nsk site they say that a 6203z is shielded one side. Zz is both sides. Mine are both sides with only a single z. My question is can I just put a sealed bearing in its place same specs otherwise.? I want to grease the originals but one shield would get dimpled in the process. And they're cheap enough just replace which I have sealed on the shelf just not shielded. Other than regressed or replace bearings motor looked pristine inside.
As for the grinder I didn't take any measurements yet to see if it's gonna grind flat. It was filthy and I always disassemble every piece I buy to first go through it too see condition and replace or fix anything that's wrong with it. It's also a sickness but 9 1/2 out of 10 times I have something better than original for pennies on the dollar. It's gonna need the bellows for the lead screw so a source of those would be great also. I'm gonna wait to see when I put everything back together and hope for the best on how flat she grinds. Ways look okay. Some flaking still visible but fades closer to operator. The table looks to have hardened ways and the mating surface looks good so fingers crossed. I'm not a big fan of repainting the machine unless your gonna strip off all old and give it what a real paint job deserves. I'm actually a fan of a 100% clean degrease and leave the factory paint. Gives it character to me. Fortunately all my machines aren't abused so scratches and wear marks are minimal.
I'll ty and post some pictures of her when done I haven't looked into loading pictures on the site yet. Thanks in advance for any comments or insight you might have on repairs.
It would probably be best to use double sealed bearings (SS) instead of the shielded ZZ bearings. They keep the grease in and the grit out. Just make sure you buy good quality ones, NOT the cheapest ones on eBay for sure! Those machines are complete orphans, so no factory parts are out there except perhaps some NOS parts that have been laying around for decades. Still, though, they probably used mostly standard hardware and common stock for most of their parts. See if you can find a user group for your grinder. Wait, let me do it, I know how to spell the name, and I don't even have a machine badge to copy from. 
