Best way to get a straight edge on a piece of ply - Woodworking Talk - Woodworkers Forum
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post #1 of 13 Old 05-11-2019, 04:51 PM Thread Starter
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Best way to get a straight edge on a piece of ply

Home Depot ply tends to have not-perfectly square edges.

So I don't want to run it through the table saw, because the fence will mirror the imperfection on the next cut, right?

What's the best way to get a perfectly straight edge, so that when I make the rest of my cuts, everything is spot on?
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post #2 of 13 Old 05-11-2019, 05:07 PM
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I don't believe I've ever seen plywood from anywhere that didn't have square edges. If the Home Depot plywood you are getting is all you can get you could make a straight edge and cut the parts with a hand held circular saw.
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post #3 of 13 Old 05-11-2019, 07:13 PM
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You have to use your table saw. Put the best side against your fence and cut the imperfect side off, make those 2 sides parallel.

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post #4 of 13 Old 05-11-2019, 08:58 PM Thread Starter
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I don't believe I've ever seen plywood from anywhere that didn't have square edges. If the Home Depot plywood you are getting is all you can get you could make a straight edge and cut the parts with a hand held circular saw.
They’re close but not perfect.

Especially the “project panels”.

One end may be 4 ft wife and the other end 3 ft, 11 5/8”.

Small difference but still there.
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post #5 of 13 Old 05-11-2019, 09:04 PM
where's my table saw?
 
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I never heard of such a thing ....

They must be making their own "project panels" using their panel saw on the midnight shift. What else would explain the difference? You probably need to diagonal measure each panel before you buy it. At least check it with a drywall square....?
You don't need "square" corners IF you can "make" them square after ripping to the correct width. Then, with a crosscut sled or a RAS set to 90 degrees, you can square off the widths. It's a PITA to hafta do that for sure, but there's not much else you CAN do.

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; 05-11-2019 at 09:09 PM.
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post #6 of 13 Old 05-11-2019, 09:13 PM
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Originally Posted by Microscopes View Post
They’re close but not perfect.

Especially the “project panels”.

One end may be 4 ft wife and the other end 3 ft, 11 5/8”.

Small difference but still there.
OK, I've never considered purchasing the smaller panels. It's not the factories fault, it's someone that works for HD that is cutting them with a panel saw. I've only bought full 4x8 sheets. Those you use the sheets to square up a cabinet when assembling.

Actually for cutting on a panel saw 3/8" difference is a lot. They must be using no care at all cutting them.
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post #7 of 13 Old 05-11-2019, 09:23 PM
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Quote:
Originally Posted by Microscopes View Post
They’re close but not perfect.

Especially the “project panels”.

One end may be 4 ft wife and the other end 3 ft, 11 5/8”.

Small difference but still there.

What you just wrote has nothing to do with an edge being straight. It says that at least one of the four corners is not exactly square, but it is pretty close. The edges may be perfectly straight and still have this error.


George
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post #8 of 13 Old 05-11-2019, 10:10 PM
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3/8" is pretty sloppy cutting, I would be talking to somebody at the store about that, around here you don't really save any money, you get a 1/4 of a sheet for 1/4 of the price, but it will fit in your car.

“Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.”
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post #9 of 13 Old 05-12-2019, 08:55 PM Thread Starter
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Quote:
Originally Posted by Steve Neul View Post
Quote:
Originally Posted by Microscopes View Post
They’re close but not perfect.

Especially the “project panels”.

One end may be 4 ft wife and the other end 3 ft, 11 5/8”.

Small difference but still there.
OK, I've never considered purchasing the smaller panels. It's not the factories fault, it's someone that works for HD that is cutting them with a panel saw. I've only bought full 4x8 sheets. Those you use the sheets to square up a cabinet when assembling.

Actually for cutting on a panel saw 3/8" difference is a lot. They must be using no care at all cutting them.
I guess I’ll go with the 4x8’s.

Next time I go, I’ll take a pic and post a few of them for you guys to see (I think you’ll get a laugh),
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post #10 of 13 Old 05-12-2019, 08:56 PM Thread Starter
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around here you don't really save any money, you get a 1/4 of a sheet for 1/4 of the price, but it will fit in your car.
That’s correct.

I actually have a truck, but I prefer the smaller panels because I’m usually alone and carrying a 3/4” 4x8 by yourself isn’t a ton of fun.
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post #11 of 13 Old 05-12-2019, 08:56 PM Thread Starter
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Quote:
Originally Posted by Microscopes View Post
They’re close but not perfect.

Especially the “project panels”.

One end may be 4 ft wife and the other end 3 ft, 11 5/8”.

Small difference but still there.

What you just wrote has nothing to do with an edge being straight. It says that at least one of the four corners is not exactly square, but it is pretty close. The edges may be perfectly straight and still have this error.


George
Sorry for saying the wrong thing.
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post #12 of 13 Old 05-22-2019, 02:58 PM Thread Starter
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Just went today. Check out this MDF. I know it’s not a massive difference but it really screws my cuts up.
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post #13 of 13 Old 05-22-2019, 03:28 PM
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Unless you need to use the entire panel just measure from the two factory edges remaining from the full sheet, never rely on a cut made at a lumberyard.

“Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.”
― Marcus Aurelius
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