Photo Index - Oliver Machinery Co. - Oliver Dado Arbor Extension

Machinery Photo Index

Manufactured/Badged by:
Oliver Machinery Co.
Grand Rapids, MI

Machine Specifications
Machine Class:	Wood Working Machinery
Machine Type:	Table Saw
Machine Size:	Saws with 1" arbor
Submitted By:	Ray Muno

Machine Specifications
Description/Model:	Oliver Dado Arbor Extension
Date of Manufacturer:	Various
Serial Number:
Last Updated	10/17/2005 1:58:17 AM

Comments:

Pictured the first photo is an Oliver dado arbor extension. It is 2-1/4" long x 1-1/2" diameter where the saw blade rides. It is shown without the spacer rings, which are missing. The extension for the earlier saws included a set of three filling collars, 1/2", 5/8" and 1", all 4" in diameter. The earlier belt drive models had 4" saw collars (arbor flanges) as standard and these collars matched the saw flange size. They are shown in the second picture which is a line drawing originally from Oliver and published in "Machine Woodworking" by Herman Hjorth, 1937. In use, the extension would be fitted to the standard arbor shaft, the dado stack installed, the proper number of collars fitted to take up the remaining length of the 1-1/2" portion of the extension, followed by the standard arbor flange and nut.

As time progressed and motor on arbor saws were introduced (1930's), the size of the flange was increased to 5-3/4" Since the diameter of the motor had to be accomodated, the depth of cut decreased. This allowed the use of the larger flanges which, no doubt, provied better support for the blade. To match up with the larger saw flange, an additional collar, 5-3/4" diameter, was included. The 4" diameter filler collars were still provided. Later on, the diameter of the filler collars was reduced, as shown in the third picture, since they merely served as spacers. The larger collar supported the blade.

The later extensions also appear to be slightly longer. This was no doubt done to accomodated the full 2" dado stack plus the additional flange.

It looks like the the actual arbor extension, or dado sleeve as Oliver termed it, did not change much in its basic design over the course of many decades. The variation was in the collars and flanges that were included, and the overall length of the extension.

If anyone has more information, I would appreciate it.

Photo 1:

Comments: Dado Arbor
Source: Ray Muno, Digital Camera

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Photo 2:

Comments: Line drawing of Dado Arbor
Source: "Machine Woodworking", Herman Hjorth, 1937

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Photo 3:

Comments: Later dado arbor extension with 5-3/4": flange
Source: Dick Streff

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