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Old 12-10-2015, 10:41 PM
tomp913 tomp913 is offline
 
Join Date: Jul 2013
Posts: 185
Default Accuracy of 12" Speed Square

I bought a 12" Swanson aluminum speed square to use for set-up, and my original checks showed that it was pretty accurate. After a while, I started to see some inconsistencies and rechecked it. I had originally just quickly set the lip against the edge of my saw table and checked with my Woodpecker square. A closer check showed that the inside of the lip on one side didn't appear to have been machined - a check with a micrometer showed that the thickness varied from end to end with it thicker in the middle. Based on that, I could get it to match the Woodpecker square depending on which way I rocked it around the high spot. I took it to a little machine shop down the road and they checked it on a Coordinate Measuring Machine (CMM) - sitting on the wide edge, the vertical edge was out .0125" over the 12" length. They set the square up on a milling machine and cut all three edges of the base exactly perpendicular to the other edge - the last two photos are with the lip hooked over the edge of the saw table. A little overkill for woodworking maybe, but I know that the square is right within a fraction of a thousandth and can rely on it when making a set-up - and for only $25, a pretty good deal.
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  #2  
Old 12-11-2015, 10:31 PM
Tracedfar Tracedfar is offline
 
Join Date: Sep 2015
Location: Balko, OK
Posts: 154
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I'm glad you figured this out! I bought the same square a few months ago and also noticed some inconsistency when making finer cuts but wasn't sure which tool was out. So, after reading your post I checked. Sure enough, it's like you described. Unless I happen on a machine shop that'll tweak it for me, I'll relegate it to framing and drop the bucks on something nicer in the shop. Thanks!
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Old 04-15-2017, 08:52 PM
tomp913 tomp913 is offline
 
Join Date: Jul 2013
Posts: 185
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Even though I'm happy with both my Speed Square and Woodpecker Square, I found this to use when squaring the fence (adjustable) to the track (pretty well fixed) on my PBB.

https://www.andersonplywood.com/squa...ol-mft-square/

Nice size and, at 3/4" thick, works perfectly for squaring the fence to the track. At $25, the price is very reasonable, but be aware that the shipping costs, at ~$19, are almost as much as the square - still way cheaper though than the one that Woodpeckers used to make.
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Old 04-16-2017, 01:57 PM
sean9c sean9c is offline
 
Join Date: Jan 2010
Posts: 1,168
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I'd seen those but not paid much attention, until now. 18" leg length. Looked at ordering 2 and shipping didn't increase over ordering one. Think I'll order 2.
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Old 04-16-2017, 05:47 PM
Jeff Freelove Jeff Freelove is offline
 
Join Date: Aug 2009
Location: Round Rock, Texas
Posts: 146
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Quote:
Originally Posted by tomp913 View Post
Even though I'm happy with both my Speed Square and Woodpecker Square, I found this to use when squaring the fence (adjustable) to the track (pretty well fixed) on my PBB.

https://www.andersonplywood.com/squa...ol-mft-square/

Nice size and, at 3/4" thick, works perfectly for squaring the fence to the track. At $25, the price is very reasonable, but be aware that the shipping costs, at ~$19, are almost as much as the square - still way cheaper though than the one that Woodpeckers used to make.
Thanks for the link! That's an excellent addition to my EZ1.
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