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Machinery Photo Index
Manufactured/Badged by:
Porter-Cable Machine Co.
Syracuse, NY and Jackson, TN

Machine Specifications
Machine Class: Wood Working Machinery
Machine Type: Sander
Machine Size:
Submitted By: Jeff Joslin
Machine Specifications
Description/Model: Type O-3 Bench Oscillating Spindle Sander
Date of Manufacturer: 1930 (very approx.)
Serial Number: 135 (View SN Registry Entry)
Last Updated 6/23/2017 9:50:44 AM

Comments:
Several years ago this early and uncommon benchtop oscillating spindle sander was part of a multi-machine purchase (not by me) from a man in his 80s. The buyer did not get much use out of it, so for $150 it's now mine.

The Porter-Cable oscillating spindle sander line was designed and patented in 1917 by Ray L. Carter of the Syracuse Sander Manufacturing Co., which was bought by Porter-Cable in 1922. Carter went on to greater fame as the inventor of the general-purpose router.

This website's 1931 catalog shows a Type O-4 that is identical to my O-3, except perhaps for the motor specs. My O-3's Master Electric Co. 1/4 HP motor is supposedly a 25 Hertz design! According to that catalog, the O-4 oscillates 1.5 times per second and the floor model Type S-1 oscillates at 1 times per second. My O-3 run on 60 Hz power oscillates once per second and also seems to be turning at a perfectly reasonable speed. Maybe the motor spec plate is wrong, I don't know.

Bill Richardson's O-3 is serial number 111, not very much before mine. Although Bill's sander is missing the oscillating mechanism, it's clear that the under-table mechanism was very different from what's shown below.

EDITED 2017 to add a photo of the switch.

Photo 1:

Comments:
Source: Seller
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Photo 2:

Comments: Switch mounted on the motor
Source:
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Photo 3:

Comments:
Source: Sander plate
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Photo 4:

Comments: Model O-Type O-4 from 1931 catalog
Source: Dan Wyatt
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Photo 5:

Comments: Table removed, gear cover flipped up to show gearing. Worm on motor shaft, gear with cam moves the arm, which in turn moves the sanding sleeve.
Source:
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Photo 6:

Comments: Reverse-angle view of mechanism with table off and gear cover flipped up.
Source:
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