Can anyone identify this item?

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Forum topic by marc_rosen posted 08-17-2011 04:19 AM 1516 views 0 times favorited 6 replies Add to Favorites Watch
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146 posts in 3417 days

08-17-2011 04:19 AM

Topic tags/keywords: jig question blade

Hey All,
(I hope this is appropriate to post here)
A friend of mine asked me if I knew what this was and my only guess is that it might be used to sharpen or true circular saw blades. On the back side of the head it reads “Speed Corp. ” “Portland ORE.” and the letters “PAT.” The only other markings are shown in the second picture. I was not able to find any listing for Speed Corp in Portland on the NET
The head is stationary while the center feature and the file holder are adjustable. The head has a tapered hub with a locking wingnut above it. The file can be move to accomodate a 7 inch radius and the file itself has an thumbscrew for fine adjustment to the blade. If this is for sharpening saw blades it looks like the blade must be spun against the fixed file.
Has anyone seen one of these and can you tell me what the moveable center feature is? There is a cursor line on the inner wheel of that center feature and it appears as if there is some eccentricity to the wheel but it is not very pronounced. I’m not sure this is a complete tool and if it is not, please let me know what parts are missing. I’m not trying to “restore” it but its mystery is annoying me.
Thanks in advance, Marc (I am aware of the website “What is This?” but I thought I would try Lumberjocks first)

-- Windsurfing, Woodworking, Weaving, and Woodducks. "Most woodworkers are usually boring holes"

6 replies so far

View Murdock's profile


131 posts in 2719 days

#1 posted 08-17-2011 05:48 AM

I was able to locate a “speed corporation” in Portland.

Here is where that listing is located

I dug around a little bit and located a few places that say they sell tools, but nothing more than that.

-- "Anyone who has never made a mistake has never tried anything new." - Albert Einstein

View CWolf's profile


32 posts in 3845 days

#2 posted 11-17-2011 06:07 PM

Did you ever learn any more about this? I came across an identical one at an estate sale today. It was hanging on the wall over his bench, as though it was regularly used. The guy had been a carver. Like you, it bugs me that I can’t figure out what it is.

View CWolf's profile


32 posts in 3845 days

#3 posted 11-17-2011 06:42 PM

Okay, I did a little more searching and found the answer. It’s for both jointing and setting (not sharpening) circular saw blades.

View MrRon's profile


5261 posts in 3479 days

#4 posted 11-17-2011 11:16 PM

The blade goes on the top part. The first thing to do is to joint the teeth so they are all equidistant from the center. The file is set to touch the shortest tooth and the blade rotated until all are equal. The center part is used to set the teeth and is removed while jointing. It is rotated so the number corresponds to the amount of set. That piece has a graduated taper on it. Every other tooth rests on the “anvil” and you strike it with a hammer to bend the tooth over. After going around, the blade is flipped over and the remaining teeth are set. This only would work with non-carbide blades. It’s a pretty primitive tool.

View marc_rosen's profile


146 posts in 3417 days

#5 posted 11-18-2011 04:52 AM

Hey Cwolf, Mr Ron,
Thanks very much for both of your inputs. That “device” has been sitting by my computer since the night I posted my query and it has tweaked my curiosity several times since then but I was always too lazy to do any more searching. Now that I know about I will hang it somewhaer in my shop, probably next to the SAWSTOP demo blade that is imbedded in the sacrifical brake that was given to me by a friend.
Primitive indeed; I don’t think I would have the patience to set the teeth on a circular blade but if I had to, I’m certain I could do it.
Thanks again guys for the info. Marc

-- Windsurfing, Woodworking, Weaving, and Woodducks. "Most woodworkers are usually boring holes"

View Alongiron's profile


650 posts in 2929 days

#6 posted 11-18-2011 06:25 AM

That’s a whatchamacalit! I have a couple of those laying around my shop too!

-- Measure twice and cut once.....sneak up on it! Steve Lien

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