Squaring up plywood - Woodworking Talk - Woodworkers Forum
 
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post #1 of 8 Old 01-24-2016, 04:19 PM Thread Starter
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Squaring up plywood

The plan I'm working with calls for me to cut several pieces of 3/4" plywood approximately 18" square. The yard where I purchased the material cut full sheets into 2 X 4 pieces, none of which are square. What cutting technique should I use to end up with square finished size pieces?
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post #2 of 8 Old 01-24-2016, 04:31 PM
where's my table saw?
 
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whadaya have for tools?

Got a table saw? Got a sled for it?

If you only have a circular saw, you will have a tough time. Time to find a friend with a table saw.

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)
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post #3 of 8 Old 01-24-2016, 04:35 PM
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Determine which edge is the factory (uncut) edge.
Use this side as your starting point with a good framing square.
Draw your 18 X 18 and cut to the line.
If the lumberyard cut the material at 18" and unsquare, your squared board may be slightly undersized.
I hope you have a table saw.
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post #4 of 8 Old 01-24-2016, 04:36 PM
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Quote:
Originally Posted by woodnthings View Post
Got a table saw? Got a sled for it?

If you only have a circular saw, you will have a tough time. Time to find a friend with a table saw.

Ditto.

If you have a table saw and no sled you could add a fence to your miter gauge and square the ends up with that.
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post #5 of 8 Old 01-24-2016, 06:27 PM
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If you don't have a table saw use a circular saw and straight edge, mark out your 18" panel from a factory edge with a framing square.

Wise men speak because they have something to say; fools because they have to say something -Plato

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post #6 of 8 Old 01-24-2016, 10:47 PM Thread Starter
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Squaring up plywood

Quote:
Originally Posted by woodnthings View Post
Got a table saw? Got a sled for it?

If you only have a circular saw, you will have a tough time. Time to find a friend with a table saw.
I do have a table saw but no sled. I have a mitre gauge. Would it work if I used the saw fence to make two parallel edges, then the mitre gauge to cut the other two edges? Would I end up with a square piece?
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post #7 of 8 Old 01-24-2016, 10:56 PM
where's my table saw?
 
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Yes, but ....

Your miter gauge must be square to the fence. Take a framing square and test it at 90 degrees. Rest the miter head so it's exactly at 90 degrees, even if it means coming off the built in stop just the slightest bit. Then lock it down tight. Make a test cut on a scrap and check it with your square. If it's good, you all set to make your other cuts.

Your problem is going to be that you won't have 18" in front of the blade to start your cut, UNLESS you pull the miter gauge partially out of it's slot. You may loose some accuracy by doing this. A sled would be a better way but alas ..... no sled.

No easy answers as far as I know to this...... except make a simple sled with a longer runner or 2 runners.

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; 01-24-2016 at 11:01 PM.
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post #8 of 8 Old 01-26-2016, 12:04 AM
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No table saw make a short version of this:
http://www.benchnotes.com/Skillsaw%2..._guide_boa.htm

Measure carefully and use a sharp blade, cut with the good side down.

As Oscar from Corner Gas would say, "It ain't rocket surgery".

Wise men speak because they have something to say; fools because they have to say something -Plato

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