Author Topic: How to square up plywood  (Read 1039 times)

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Online Slowlearner

  • Posts: 48
How to square up plywood
« on: May 17, 2019, 08:47 PM »
So im new to wood working and i suck w measuring no matter how hard i try. Dont ask. Lol. So im waiting for my woodpeckers t square. So ive heard that wood is not completely square from the store. So whats best way to square? Take a measurement off corner  say 3/4" up then rip it down and same for across?

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Online Oldwood

  • Posts: 350
  • Alberta, Canada
Re: How to square up plywood
« Reply #1 on: May 17, 2019, 11:09 PM »
Often the long edge is also not straight so the best thing to do is to take what is referred to as a dust cut. I try to keep the blade in the material on both sides so it is less of a dust cut. A lot of sheet stock is over the 96" x 48" dimension and this allows a wider dust cut.

Once you have a known straight edge you can square off of that.

HTH
Gerry
Real knowledge is to know the extent of one's ignorance.
Confucius

Offline Untidy Shop

  • Posts: 2706
Re: How to square up plywood
« Reply #2 on: May 18, 2019, 12:25 AM »
Yes, never, never, never assume that any cut from a factory or timber yard, be it sheet goods or lumber, is square!!!

When I worked for an Australian Hardware Store Chain, the rail saw in our timber yard was 87 degrees to the long bench fence. No problem for basic sizing cuts that the customer would later trim, but not accurate enough for final saw cuts intended for precision work.
« Last Edit: May 18, 2019, 03:43 AM by Untidy Shop »
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Offline threesixright

  • Posts: 184
Re: How to square up plywood
« Reply #3 on: May 18, 2019, 01:39 AM »
Indeed. Never assume!

Not sure what tools you have at your disposal.

Take a rails, put it over the short side, like cm of the edge. Take you track saw, cut a small portion.

Now you have straight edge, you can trust and work with. Also in case there was some transport damage you make you have a nice clean edge.




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« Last Edit: May 18, 2019, 02:39 AM by threesixright »

Online Slowlearner

  • Posts: 48
Re: How to square up plywood
« Reply #4 on: May 18, 2019, 02:00 AM »
Great thanks. Last question so lets say i have some scrap wwod with a messed up cut, i would find the lowest flat spot and go off of that?

Offline threesixright

  • Posts: 184
Re: How to square up plywood
« Reply #5 on: May 18, 2019, 02:42 AM »
Great thanks. Last question so lets say i have some scrap wwod with a messed up cut, i would find the lowest flat spot and go off of that?

Just move your rails passed the bad cut and you should be good to go.

Online Slowlearner

  • Posts: 48
Re: How to square up plywood
« Reply #6 on: May 18, 2019, 08:20 AM »
I dont have parell rails yet mayne a future purchase

Online Bob D.

  • Posts: 1020
Re: How to square up plywood
« Reply #7 on: May 18, 2019, 09:04 AM »
Well, you haven't provided us any idea of what you have to work with which makes it tough to reply with good recommendations on how t best proceed.

Do you have a track saw, maybe a circular saw with a DIY track. That's what I used for years until I got a track saw.

What surface are you cutting on. Do you have a sheet of foam board to support the workpiece or are you cutting on sawhorses or something else?
-----
It's a table saw, do you know where your fingers are?

Online Slowlearner

  • Posts: 48
Re: How to square up plywood
« Reply #8 on: May 18, 2019, 10:25 AM »
Well it was more of how to but i have ts55 w track  may use saw horses mostly on my mft

Offline threesixright

  • Posts: 184
Re: How to square up plywood
« Reply #9 on: May 18, 2019, 01:41 PM »
Well it was more of how to but i have ts55 w track  may use saw horses mostly on my mft
rails == track  [eek] [tongue]