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Clear Mini Try Square

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Project by DevinT posted 03-26-2021 12:58 AM 628 views 0 times favorited 7 comments Add to Favorites Watch

I was told it was nigh-impossible to do this, so I had to try it. The challenge is getting the getting the angles tight and accurate. It was deceptively challenging.

One cannot simply route an L-shape out of plastic because it will leave an inner radius on the inside angle which cannot be fixed with chisels, like you can when working with wood.

Creating a crystal clear edge on cut plexiglass without coming out-of-square is quite a challenge and took several jigs. Once I had figured out how to do that, it was a simple matter of using WeldOn/SciGrip #3 solvent to chemically join two edges at a 90-degree angle.

The result is great and I can make them faster now, but the first one was definitely a real challenge.

I initially did this because I had to determine the feasibility as well as the strength of an edge-joint in acrylic. I am pleased to say that the resulting square is extremely strong (I have dropped it several times—once from a height of 4’—and it has remained intact).

-- Devin, SF, CA





7 comments so far

View Dave Polaschek's profile

Dave Polaschek

7335 posts in 1641 days


#1 posted 03-26-2021 01:03 AM

Spiffy! One solution I can think of to the inside angle (which I saw on a commercial square somewhere) is to drill the corner of the inside angle, thus removing the problem there. Then you can route to the edge of the drilled hole and it’s still good for measuring all but the smallest corners.

-- Dave - Santa Fe

View DevinT's profile

DevinT

367 posts in 25 days


#2 posted 03-26-2021 01:06 AM



Spiffy! One solution I can think of to the inside angle (which I saw on a commercial square somewhere) is to drill the corner of the inside angle, thus removing the problem there. Then you can route to the edge of the drilled hole and it’s still good for measuring all but the smallest corners.

- Dave Polaschek

Derp! You’re absolutely right. My carpenter’s framing square has exactly that! Thank you, I don’t know why this wasn’t coming to me.

-- Devin, SF, CA

View Dave Polaschek's profile

Dave Polaschek

7335 posts in 1641 days


#3 posted 03-26-2021 01:11 AM

Heh! Sometimes missing the solution everyone else has found leads to a better solution. Sometimes, not so much, but I think you learned some things about working plexiglas that most people don’t know.

-- Dave - Santa Fe

View woodbutcherbynight's profile (online now)

woodbutcherbynight

8861 posts in 3467 days


#4 posted 03-26-2021 01:47 AM

I like it, now I need to make one. The idea of being able to see what is below appeals to me.

Nice work.

-- Live to tell the stories, they sound better that way.

View LittleBlackDuck's profile

LittleBlackDuck

6962 posts in 1879 days


#5 posted 03-26-2021 02:53 PM

I have a couple of Woodpecker squares so while yours serve their purpose I glossed over them until I read wbbn’s comment of see what’s below... reminds me of long time no C below my gut…

Be interested in how it may come up cut on the laser. Might even try some calibrations….

Your WeldOn/SciGrip #3 mentioned got me spending a few shekels as an alternative to my previous CA acrylic glue-up disaster.

-- If your first cut is too short... Take the second cut from the longer end... LBD

View grovemadman's profile

grovemadman

960 posts in 4830 days


#6 posted 03-28-2021 08:12 PM

Nice! As a glazier by trade I have had the unfortunate privilege of dealing with plexi-glas. It can be frustrating at times. Looks like you tamed the beast.

-- "It is the job of the woodworker to hide his mistakes and keep a tight set of lips about them!"--Chuck

View Eric's profile

Eric

1288 posts in 932 days


#7 posted 04-20-2021 12:07 AM

Nice job on the square. Being able to work with different mediums is a great talent. Great job.

-- Eric, building the dream

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