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Machinery Photo Index
Manufactured/Badged by:
Rockwell Manufacturing Co.
Pittsburgh, PA

Machine Specifications
Machine Class: Metal Working Machinery
Machine Type: Sander
Machine Size: 1 x42 belt sander
Submitted By: So-Cal Tinkerer
Machine Specifications
Description/Model: 1 x 42 Sander/Grinder 31-350
Date of Manufacturer: 1971
Serial Number:
Last Updated 3/5/2016 2:14:52 AM

Comments:
Found this in a sorry state for $15, I believe this one was the first version of the 31-350. It had four colors/layers of paint done from previous owners and as with almost all of these, the belt wheels were shot. Took it apart, re-painted and added new wheels, v-belt, hardened tool steel platen and a couple of mods. The belt spring was pretty week, only had a bout 8 lbs of tension, I added a cantilever arm with an additional spring, adjustable from 9lbs to 25 lbs. Also added knobs for the tracking and table adjustment. The aluminum belt guard is not original but works well. The table was machined flat (.003") and table edges were milled squared and straight to use with jigs if needed.

Original 1/2hp Rockwell motor (needs paint) works well but could use more power. This grinder could see a variable speed DC motor mod in its future. Another idea for a smaller footprint is remove the flat base and mount the motor underneath table.

Photo 1:

Comments:
Source: CB
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Photo 3:

Comments: squared straight edges
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Photo 4:

Comments: Hammerite hammer tone paint
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Photo 5:

Comments: adjustable spring tension mod
Source: CB
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Comments: found condition
Source: CB
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