SPT Mounting Posts
The Jointer, Jig Saw, Belt Sander, Bandsaw and Air Compressor that all originally came out in the 1950’s started with straight mounting tubes. The Jointer, Jig Saw and Belt Sander tubes had snap rings to rest on the Mark 5 headrest mounting holes. The Bandsaw and Air Compressors (both the original Magna and later Campbell Hausfeld) had collars to set the height. The Air Compressors had mounting tubes with a threaded insert at the top of the tube for attaching with a bolt to the compressor frame and both only used straight mounting tubes. The original Magna Air Compressor mounting tube was hollow and the later CH Air Compressor had solid mounting tubes but could have had hollow tubes at some point.
The Scroll Saw and Strip Sander which came out in the 1980’s have only had eccentric mounting posts. Later the Scroll Saw changed from Gray to Teal paint. The mounting post information below is for the Gray Scroll Saw. Later parts lists leave off the mounting posts of the Teal Scroll Saw for some unknown reason. At some point the Jointer, Belt Sander and Bandsaw changed to eccentric mounting posts. The Jig Saw Mounting posts changed to eccentric posts by July 1982 (manual date). The Bandsaw has an optional offset mounting post to allow it to stay on the Mark V when it is put up into drill press mode. The Bandsaw cannot stay on Marks having the Double Tilt feature when raised into drill press mode. This off set mounting post is not included in the information about eccentric mounting posts below.
SPT – straight post ... Overall Length . Length from top to ring/collar*
Jointer ................. 3-7/8”............1-5/16” ............................ P/N A3094, 3094
Jig Saw ................. 8-7/8” .......... 6-3/4” ............................. P/N 502289
Belt Sander ............ 6-1/4” .......... 4-1/8” ............................. P/N B3532, 503002
Band Saw .............. 7-1/2” .......... 4-3/4” ............................. P/N A3466
Air Compressor – M ... 6-1/8” .......... 2-1/2” ............................. P/N 66100, 502568
Air Compressor – CH . 5-1/2” .......... 3-3/4” ............................. P/N 516533
*Collars are measured from the top of the post to the bottom of the collar. Lengths may vary.
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SPT – eccentric post . Overall Length . Length from top to eccentric offset
Jointer ................. 3-1/2” .......... 1-3/4” ............................. P/N 502080, 5020809
Jig Saw ................. 8-7/8” .......... 6-3/4” ............................. P/N 513776
Belt Sander ............ 6-1/2” .......... 4-1/2” ............................. P/N 513777, 5137779
Band Saw .............. 6-1/2” .......... 4-1/2” ............................. P/N 513777, 5137779
Scroll Saw ............. 6-1/2” .......... 4-1/2” ............................. P/N 513777
Strip Sander ........... 8-7/8” .......... 6-3/4” ............................ P/N 513776, 5137769
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There was an additional pair of straight posts with snap rings that are for the Jointer from the 2nd Power Mount Adapter Kit Item Number 11 920 made in the mid 1950’s for using SPT’s on the Shopsmith Model 10’s. One of the reasons for using collars on the Bandsaw and Magna Sprayer (Air Compressor) straight mounting posts instead of the snap ring appears to be for use on the Model 10 Adapters. SPT's used on those adapters whether the "A" or "B" adapter may sit at different heights to the Model 10 Drive Sleeve Pulley Hub than those on the Mark 5 Drive and Idler Shaft Hubs. The 2nd Adapter Kit included the "A" and "B" Adapters plus the longer posts for the Jointer. The Air Compressor was introduced about the same time as the 1st Adapter Kit and collars were used on its posts to allow for that adjustment. The Bandsaw was introduced about the same time as the 2nd adapter kit. The Jointer and Air Compressor mount on the "A" Adapter and the Jig Saw, Belt Sander and Bandsaw mount on the "B" Adapter. The original Power Mount Adapter Kit only had the "A" Adapter. It was for mounting the Jig Saw and the Air Compressor (Magna Sprayer) with no provision made for mounting the Jointer. Because the "A" Adapter sits higher the Jig Saw's snap ring posts were inverted and collars used to set the height. There wasn't a mounting option for the Jointer with the 1st Power Mount Adapter Kit since Magna still sold the Model 10 Jointer mounting kit with the special headrest. Like the Model 4E Jointer the Model 620 jointer still had the mounting holes for that kit until the Jointer changed to the Model 620-C.
