Photo Index - Milwaukee Electric Tool Corp. - SB132 Bench Grinder (116 Frame)

Machinery Photo Index

Manufactured/Badged by:
Milwaukee Electric Tool Corp.
Milwaukee, WI

True Manufacturer:
Kingston-Conley Electric Co. / Hoover Co., Jersey City, NJ; North Plainfield, NJ

Machine Specifications
Machine Class:	Metal Working Machinery
Machine Type:	Grinder, Bench
Machine Size:	1/3HP, 6"
Submitted By:	Jakob Thordarson

Machine Specifications
Description/Model:	SB132 Bench Grinder (116 Frame)
Date of Manufacturer:	1949
Serial Number:	3127FF1 194924
Last Updated	9/15/2021 7:52:17 AM

Comments:

Bought from the junkyard in Reykjavik, Iceland in December, 2020.
Judging by the serial number, I'd guess it's from 1949. The starter cap is from 1946
These grinders were made by Kingston-Conley, and resold by numerous companies in the 30's, 40's and 50's (I've seen them from Walker-Turner, Snap-On and more). This type of grinder appears in Walker-Turner catalogs ranging from 1937 to 1955.
Wheel size for these are 6" diameter, 3/4" wide with a 1/2" arbor hole.

All hardware mounting screws are imperial. 5/16-18 screws hold the side covers, will try to update with more screw sizes.

This grinder has two 6202N ZR bearings from FAG. ZR configuration means shield on one side, open on other side. Suitable replacement bearings would be 6202 ZR or 6202 Z2 bearings.
ZR means it has a shield on one side (Z), and is open on the other (R). Shield side is originally turned toward the center, open side toward the wheels. The bearing is open because the grinder has oiling holes to allow for oiling the bearings. I consider this unnecessary, as well as a potential failure point, so I replaced my bearings with 6202 Z2, that have a shield on both side.
The original 6202N bearings also have a snap-ring groove on the outside (hence the N designation in the name) on their the open side, but those grooves are pointless and add unnecessary cost.

Photo 1:

Comments: The grinder as it looked when I bought it
Source: Jakob Thordarson (first hand source)

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Photo 2:

Comments: Badge on front of grinder
Source: Jakob Thordarson (first hand source)

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Photo 3:

Comments: Inside of the grinder and motor stator with bearings removed. Right hand side shows the starter contactors. When the grinder is up to speed, the contact is pushed open (so the starter cap and starter winding isn't connected when at proper speed).
Source: Jakob Thordarson (first hand source)

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Photo 4:

Comments: Rotor of the motor, with bearings and spacers. The starter mechanism is on the left side of the center. The spacers may be on the wrong side. Don't use my picture as referrence for yours. If it doesn't start by itself after reassembly and the cap is not t
Source: Jakob Thordarson (first hand source)

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Photo 5:

Comments: The original Mallory Motor Starter cap after peeling off the paper wrapper. This cap is from 1946 - 108-120uF, rated for 110V. Pretty good service life of 75 years, running on 220v, so 100% over the rated voltage. Still works fine but I'll replace it none
Source: Jakob Thordarson (first hand source)

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Photo 6:

Comments: After a quick cleanup
Source: Jakob Thordarson (first hand source)

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