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Twokamprs 01-24-2016 04:19 PM

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?

woodnthings 01-24-2016 04:31 PM

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. :yes:

Toolman50 01-24-2016 04:35 PM

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.

TrevortdogR 01-24-2016 04:36 PM

Quote:

Originally Posted by woodnthings (Post 1244050)
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. :yes:


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.

FrankC 01-24-2016 06:27 PM

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.

Twokamprs 01-24-2016 10:47 PM

Squaring up plywood
 
Quote:

Originally Posted by woodnthings (Post 1244050)
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. :yes:

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?

woodnthings 01-24-2016 10:56 PM

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.

FrankC 01-26-2016 12:04 AM

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".


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