1950's Milwaukee 7" Bench Grinder

[CdaGuinn]

Hi All,

I found this monster at a local pawn shop for $50! Here’s what I’ve been able to discover so far: This is a 7” Bench Grinder made for Milwaukee by Kingston-Conley sometime in the mid 50’s and it is HUGE! Easily twice the size of my late 70’s ¼ HP Blue Point 6” (made by Doerr).

Why would there be two ratings for Cycles, RPM, and Amps?

If anyone of you has any further information/ warnings/ manuals/ bearing sizes/ idiosyncrasies about this model, I’d love to pick your brain!

Thanks!

 

[Packard V8]

Nice find. I'd pay $50 for as many as anyone finds.

Why would there be two ratings for Cycles, RPM, and Amps?

Maybe because it is rated for use on both 50 cycles and 60 cycles 110 volt current. That's pretty rare, because most 50 cycle current is also 220 volt, as commonly used in Europe. I don't know who used 50 cycle 110 volt.

jack vines

 

[CdaGuinn]

Thanks for the reply!

I'm trying to find as much information as I can.

 

[Two Sheds]

Before 1950 there were many areas of the U.S. and Canada that used 50 cycle power, such as Southern California. There were also many pockets of 25 cycle power, and some vestiges of DC as well. And many countries still haven't standardized, for example half of Japan is 50 Hz and half is 60 Hz.

 

[zkling]

For an ac, non universal motor, speed of the motor deviation from base speed is based on frequency.

 

[CNGsaves]

^ ^ ^ This. At only 50 Hz the grinder spins at the lower speed.

USA is standardized on 60 Hz so you'll have the faster RPM.

Great grinder for $50 . . . You Scored !!!

 

[Mavawreck]

Looks almost identical to my Walker Turner