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Thor 8" Grinder today

Greg Barry

Member
Joined
May 3, 2019
Messages
7
Location
Cedar Park, Texas
Hi all. Been lurking a while, and this is my first post. I've gained a lot of useful, valuable info from this site.
For some time now I've wanted a decent bench grinder, but didn't want anything from offshore. Well, today was the day. FB Marketplace coughed up a Thor 8" bench grinder, and what caught my attention was it's completeness. Even the eye shields were there! I removed them before I took the pic.
Two hours and $40 later I was home with it, and a few minutes removing the old power cord and rigging a temporary, and it was running. A little bearing noise and a slight vibration, but otherwise it seems to be in good condition. Nice and heavy, all cast iron. Needs to have the left side wheel replaced, and both bearings could be replaced, but otherwise it seems a good candidate for a restore and use.
In the first photo you can see the hole for the original on/off switch. Former owner at one time drilled two new holes and bolted on a standard electrical box, and put a household switch in it. I removed the box, and intend to put on a toggle switch like the original. There may have been a "guard" of some sort around the original switch. Comments?
Biggest problem seems to be a lack of info. I see a few 6", 1/3 HP units on the net, but I can't find any 8", 1/2 HP like this one.
Can anyone point me to some good info on this grinder. Parts aren't really an issue as it has original eye shields and tool rests. Mostly I'd like to find info on manufacturing date and such. I plan to clean it up and paint it, replace the plexi-glass in the shields, put on a new fine cut wheel, and just use it.
comments and info welcomed!
 

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Greg Barry

Member
Joined
May 3, 2019
Messages
7
Location
Cedar Park, Texas
Looks like that catalog was from 1948. I think mine was a later grinder, although the same B8S as listed in the catalog. $96 was a lot of money in 1948.
Thank you!
 
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Greg Barry

Member
Joined
May 3, 2019
Messages
7
Location
Cedar Park, Texas
Bearings are just standard 6204-zz. New ones from Nachi are on the way, as well as a new fine cut wheel to replace the abused, grooved one that was on it. Read up on balancing wheels and made a huge difference in the vibration by simply getting the course wheel centered on the shaft. It could use a little work on the face, but it was in much better shape than the fine.
I think the bearings will make it a lot quieter. Isn't all that loud now, but it could be quieter. Been wanting a bench grinder for a long time. I'm like a kid with a new BB gun now!
 
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kythri

Well-known member
Joined
Jan 3, 2007
Messages
6,330
Location
Lebanon, OR
Nice. With an amp rating like that, seems closer to a 3/4HP unit - always nice to see conservative ratings, unlike today's misrepresented 2-amp units rated at 3/4HP.
 

bastage

Well-known member
Joined
Feb 6, 2017
Messages
234
Location
Kuna ID
Thats a hell of a score.. I love old tools & your grinder got mine beat by age, size & cost..
 
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Greg Barry

Member
Joined
May 3, 2019
Messages
7
Location
Cedar Park, Texas
kythri, yeah, I kinda think its underrated, too. One of the reasons I waited and watched and waited and watched....Didn't want some cheap offshore grinder.
StillTooMany, thank you for the link, but I got a switch for it today. All the rain down here shut down all our job sites, so we all stayed home today. I may one day replace it with one of those cool ones with the On and Off markings. They kinda look like they'd be right on an oldie.
bastage, thanks for the compliments. Got a little work to do to get it up to par, but the completeness of it was a big attraction. No scouring the internet for eye shields and tool rests and such. Its just a matter of cleaning it up, replacing bearings and wheels and plexiglass and the switch. A little paint and it'll be GOOD!
 
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Greg Barry

Member
Joined
May 3, 2019
Messages
7
Location
Cedar Park, Texas
New bearings installed today, grinder reassembled. New Fine cut wheel, new capacitor. Spent a little time adjusting wheels to get them centered, and the dang things runs pretty smooth now. Certainly a lot quieter than it was. Gonna be a nice grinder when I finish with it. Making 4 new rubber feet from rubber bottle stoppers.
Now for a more technical question. The centrifugal switch seems to be operating fine, but when it closes as the motor spins down, it seems there is a lot of friction. It actually seems to be providing a measure of braking , slowing the motor noticeably. Is that normal? Does it need some sort of adjusting? If there is more friction there than is supposed to be, I'm guessing that will cause the mechanism to fail soon. Anyone with more knowledge please educate me!
 
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