Straight edge/ ruler. - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 29 Old 11-17-2019, 11:57 AM
where's my table saw?
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Checking a straight edge for "straight" ....

You can esily verify a straight edge by doing the following. Take your steel, aluminum, plastic whatever you choose to use and lay it on some clean white paper. Make as fine a mark as possible along the entire edge using a knife edge or hard pencil or ball point keeping the same position as you move along. Then flip it end for end keeping the same edge down, and line it up against the line your just made and see if they are parallel. Make another line and see if the two lines are parallel. If not, there's a very good chance it's got a curve to it.

Butting two straight edges together at the store will reveal if either one has a curve, but you won't know which until you try several where there is no gap or light visible between the two them. Flipping one end for end is also required in this process.

Yes, I said plastic because some very fine drafting T squares have an acrylic edge. All drafting triangles are made from some type of clear plastic, so I think their edges should be as good as we woodworkers would require.... you think?
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The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 11-17-2019 at 12:02 PM.
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post #22 of 29 Old 11-17-2019, 02:31 PM
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Originally Posted by hawkeye10 View Post
I hope we aren't getting huffy puffy about a straight edge.

LOL!!! I think this thread has far exceeded any useful life.

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post #23 of 29 Old 11-17-2019, 02:32 PM
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Are you saying I donít need to spend $10,000 to get a straight edge?
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post #24 of 29 Old 11-17-2019, 02:45 PM
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Originally Posted by Kerrys View Post
Are you saying I don’t need to spend $10,000 to get a straight edge?
No, only if you want a straight line you do. If you don't use one for $10K, the Bureau of Weights And Measures will be at your doorstep. But then again, you are the type of guy that lives on the edge, even if it ain't straight.
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post #25 of 29 Old 11-27-2019, 12:32 PM
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I agree. Flatness can mean different things to others. A machinist is more concerned about flatness than a carpenter. I have a Starrett 60" straight edge with one beveled edge. I was fortunate to find it at a storage facility sell off of abandoned belongings. I believe I paid $15 for it. I also picked up many precision Starrett tools for a few dollars each.
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post #26 of 29 Old 11-27-2019, 01:01 PM
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Welcome to the forum, Ron !!
looking forward to seeing your projects when you are ready.



there is no educational alternative to having a front row seat in the School of Hard Knocks.
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post #27 of 29 Old 11-27-2019, 02:24 PM Thread Starter
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Originally Posted by hawkeye10 View Post
I hope we aren't getting huffy puffy about a straight edge.

Same here, man what a storm I set off I am just a little OCD about things and having a straight edge is one of them. I do know someone who is a machinist, might take my 48" aluminum ruler and have him tweek it


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post #28 of 29 Old 11-27-2019, 02:38 PM
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it is safe to say that we are all in different types of woodwroking. a drywall square might be the best square in your toolbox, and another fellow might have spent hundreds for a square. we should repsect each others opinions and what level of woodworking we enjoy and perform, and whatever we want to spend on our tools.

i often disagree with what is said here, but i don't have to argue on here beacuse i know that others don't do what i do. and i know that others have diffferent experiences than me.

if a plastic ruler is fine for you - great! there are times when i use the edge of a tablet... and others when i reach for the starret.

happy thanksgiving!
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post #29 of 29 Old 11-29-2019, 11:12 AM
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I'm late to this game, and you guys will probably laugh at me, but ...

Cheap. The ruler is stainless steel, which was a factor.

I bought this looking for a straight edge for my bench (usually don't need more than 24").
I went through their inventory looking for the straightest one I could find. And I found "the one".
I tossed the other parts.
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