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Show us Your Vintage Bench Grinders!!!!

ALLFAST

Well-known member
Joined
Feb 20, 2017
Messages
1,233
Location
Northern California
I have one of these grinders. Really heavy duty construction for a grinder of its power rating.
Yes,
IIRC, Skil was made by Kingston Connelly? I’ve got a late 40s Skil 10 inch 1 Hp 1725 RPM grinder which is rated at 13 amps.

I had a 1930s Baldor of the same size/HP/speed and it was rated at 9amps-The Skil is a beast !
 
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dutchgray

Well-known member
Joined
Sep 28, 2014
Messages
6,468
Location
Dorset. England.
Bought a pair of Wolf 8" 3 phase grinders, both have the cast pedestal, one has non standard work rests.
Need a bit of work but they are ok for £100 each.20250624_190809.jpg
20250624_190852.jpg
One has been painted with horrible orange paint but it is peeling off so I should be able to get rid of it easily, the other has been fitted with some very narrow wheels for some reason.
 

Ryebeach

Member
Joined
Aug 1, 2025
Messages
16
I have a Van Dorn 8" grinder 1/2 hp, 3600 rpms, 110 volts, 8 amps, Serial No. 110724. It runs fairly smooth. Manual grease opening on the top sides of the motor. I believe its pre 1925 model. Can't find any pictures on the web to show what parts are missing. Would this been worth a $100?
 

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Mike'smeatshop

Well-known member
Joined
Apr 1, 2023
Messages
1,273
I have a Van Dorn 8" grinder 1/2 hp, 3600 rpms, 110 volts, 8 amps, Serial No. 110724. It runs fairly smooth. Manual grease opening on the top sides of the motor. I believe its pre 1925 model. Can't find any pictures on the web to show what parts are missing. Would this been worth a $100?
I would have paid that. Some wouldn't. After cleaning it up some, I think you will be pleased. They don't make classics like that anymore. Good pick.
 

Outlawmws

Well-known member
Joined
Aug 9, 2011
Messages
39,299
Location
The Badlands
Would this been worth a $100?

Like Mike said some would some wouldn't

Too many questions for me:

Key is how are the bearings? with those oilers it may be Babbitt sleeves. Is the armature rattling in those?

No guards, one pitiful rest. those are essential at 3600 RPM adn ay 8"

I'm a bit surprised at 1/2HP for an 8" wheel. but it's also 8 amps at 110V, We are at 122 most places these days... so it may be closer to 1HP in reality? Surely at least 3/4

My "Load test' for a grinder is to laod the wheel with a 2X4 and see if I can stall it, and how easily.
 

Davefr

Well-known member
Joined
Jan 7, 2010
Messages
11,839
Location
OR
I have a Van Dorn 8" grinder 1/2 hp, 3600 rpms, 110 volts, 8 amps, Serial No. 110724. It runs fairly smooth. Manual grease opening on the top sides of the motor. I believe its pre 1925 model. Can't find any pictures on the web to show what parts are missing. Would this been worth a $100?
It's like an old brass fan. Do a quality restoration and put it on display. It's really cool. However I wouldn't use it. (8 amps, 8", wire wheel, no guards - what could possibly go wrong!!)
 

exmaxima1

Well-known member
Joined
Jun 25, 2011
Messages
6,343
Location
Midwest
I have a Van Dorn 8" grinder 1/2 hp, 3600 rpms, 110 volts, 8 amps, Serial No. 110724. It runs fairly smooth. Manual grease opening on the top sides of the motor. I believe its pre 1925 model. Can't find any pictures on the web to show what parts are missing. Would this been worth a $100?
What is that slotted cover screw on the front left side?
 

MR.X

Well-known member
Joined
Dec 13, 2010
Messages
1,794
$25.00. Just walking thru the neighborhood and lady is having a moving sale. I guess the legs are from some old manual lathe.
 

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Ultradog MN

Well-known member
Joined
Jan 20, 2024
Messages
784
Location
Twin Cities
Awesome!
Do you have the wheels for it?
They will set you back a bit.
I have a little 12" pedestal grinder and would like to find new wheels for it.
 

futileresistance

New member
Joined
Nov 9, 2022
Messages
3
Unable to see much info on this. The wheels are 12" x 2"
Whole thing probably weighs 350-500 lbs.
It has a solid brass nameplate.
Says
Powermatic Heavy Duty Grinder
McMinnville, TN.
HP 2 RPM 1750
Can you tell me more motor specifics? Date of manufacture?
I don't have 3 phase power, so I need to set up a Variable Frequency Drive, but not sure if they can handle the inertia load back into the system, after powerdown. thank you for your help.
 

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AntiqueBen

Well-known member
Joined
Aug 4, 2021
Messages
1,438
Unable to see much info on this. The wheels are 12" x 2"
Whole thing probably weighs 350-500 lbs.
It has a solid brass nameplate.
Says
Powermatic Heavy Duty Grinder
McMinnville, TN.
HP 2 RPM 1750
Can you tell me more motor specifics? Date of manufacture?
I don't have 3 phase power, so I need to set up a Variable Frequency Drive, but not sure if they can handle the inertia load back into the system, after powerdown. thank you for your help.
Here is 2 HP Powermatic in the link below. Powermatic is made by Baldor. There's a few other Powermatic bench grinders on this page.
Photo Index - Powermatic Machine Co. - 1217W Powermatic 2HP Bench Grinder | VintageMachinery.org http://vintagemachinery.org/photoindex/detail.aspx?id=41449
 

Ultradog MN

Well-known member
Joined
Jan 20, 2024
Messages
784
Location
Twin Cities
Unable to see much info on this. The wheels are 12" x 2"
Whole thing probably weighs 350-500 lbs.
It has a solid brass nameplate.
Says
Powermatic Heavy Duty Grinder
McMinnville, TN.
HP 2 RPM 1750
Can you tell me more motor specifics? Date of manufacture?
I don't have 3 phase power, so I need to set up a Variable Frequency Drive, but not sure if they can handle the inertia load back into the system, after powerdown. thank you for your help.
I believe I have that same grinder.
I added a photo of the tag if that helps.
My guess is it's closer to 300 lbs.
Mine came from a high school and had all that safety stop and electronic braking **** on it.
I took it all off and installed a simple AB starter.
I run mine off a rotary phase converter as I have several other 3 ph machines in my shop.
 

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Sawmill7

Well-known member
Joined
Sep 3, 2019
Messages
253
Location
Iron River Mi
I could use some help on this 10" black and decker
Capacitor size and how to remove inner flanges.
Also how hard to take armature out and reassemble. Thanks Bill
 

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Steve from Socal

Well-known member
Joined
Jan 27, 2009
Messages
3,501
Location
Hutchinson Ks.
I believe I have that same grinder.
I added a photo of the tag if that helps.
My guess is it's closer to 300 lbs.
Mine came from a high school and had all that safety stop and electronic braking **** on it.
I took it all off and installed a simple AB starter.
I run mine off a rotary phase converter as I have several other 3 ph machines in my shop.
Wow that safe start button is quite the piece, the short bus kids would be all over that!
 

Ultradog MN

Well-known member
Joined
Jan 20, 2024
Messages
784
Location
Twin Cities
Wow that safe start button is quite the piece, the short bus kids would be all over that!
Here's a couple more photos of when I got it. That dynamic braking system required two 12x12x6" enclosures to contain it all that they had scabbed on it everywhere and with that "short bus" off switch ruined the looks of the old thing.
The brake did work tho. Before I took all that stuff off I did an experiment. I ran it up to speed then hit the big stop button. It took 16 seconds to come to a full stop.
Then I ran it up to full speed and unplugged it from the wall. It took 1 minute and 46 seconds to spool down to full stop.
I just watched it and smiled :)
 

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futileresistance

New member
Joined
Nov 9, 2022
Messages
3
Here's a couple more photos of when I got it. That dynamic braking system required two 12x12x6" enclosures to contain it all that they had scabbed on it everywhere and with that "short bus" off switch ruined the looks of the old thing.
The brake did work tho. Before I took all that stuff off I did an experiment. I ran it up to speed then hit the big stop button. It took 16 seconds to come to a full stop.
Then I ran it up to full speed and unplugged it from the wall. It took 1 minute and 46 seconds to spool down to full stop.
I just watched it and smiled :)
The inertia formula uses rotating mass. I calculate each grinding wheel at 21 lbs each. Since it is a 220v - 3 phase - 2hp motor... it should be about 1492 watts (746 x 2). I am going to use a 2.2kw braking resistor, which needs to stop that mass in 15 seconds. I don't want to toast the vfd in the very first use.
 

futileresistance

New member
Joined
Nov 9, 2022
Messages
3
I could use some help on this 10" black and decker
Capacitor size and how to remove inner flanges.
Also how hard to take armature out and reassemble. Thanks Bill
Probably 160 - 230 microfarad. As far as taking it apart, photos and label everything. Bag and tag the screws and such. You will mess up, but that's how you learn. Get a 8" bearing puller. Have fun.
 
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