Meatwad Posted July 28, 2022 Author Report Share Posted July 28, 2022 I've got no plans. Just wanted to make something simple I could start using. For the router table sled I'm actually making it without runners so the flatness on that one is what's critical. For the table saw sled I'm going to try some of the miter bars from Microjig as well. So pretty much this is some testing I'm doing to see what can be helpful. Quote Link to comment Share on other sites More sharing options...
wtnhighlander Posted July 28, 2022 Report Share Posted July 28, 2022 Don't forget that plywood is subject to unbalanced humidity exposure. I try to avoid leaving loose plywood parts lying flat on my bench or floor for any length of time. Quote Link to comment Share on other sites More sharing options...
Meatwad Posted July 28, 2022 Author Report Share Posted July 28, 2022 That's what's interesting. After I applied the poly it was drying with plenty of airflow all around. And the other half of the sheet, without poly, is still flat. I mean it's not a huge difference but definitely discernible. 1 Quote Link to comment Share on other sites More sharing options...
BillyJack Posted July 28, 2022 Report Share Posted July 28, 2022 I never put a finish on jigs. Everything stays as it started... Quote Link to comment Share on other sites More sharing options...
woodprox Posted August 1, 2022 Report Share Posted August 1, 2022 There are a few ways to flatten plywood. You can use a belt sander, orbital sander, or hand plane. If the plywood is warped, you can also use a heat gun to soften the wood and then bend it back into shape. Quote Link to comment Share on other sites More sharing options...
phinds Posted August 1, 2022 Report Share Posted August 1, 2022 On 8/1/2022 at 3:41 PM, woodprox said: There are a few ways to flatten plywood. You can use a belt sander, orbital sander, or hand plane. I take it you've never had a very warped plywood sheet. The methods you suggest are useless if you have a 4' x 8' sheet that is cupped by even 1/2" and you want the whole thing flat (AND whole) 1 Quote Link to comment Share on other sites More sharing options...
Tpt life Posted August 1, 2022 Report Share Posted August 1, 2022 2 hours ago, phinds said: I take it you've never had a very warped plywood sheet. The methods you suggest are useless if you have a 4' x 8' sheet that is cupped by even 1/2" and you want the whole thing flat (AND whole) Agreed. Quote Link to comment Share on other sites More sharing options...
JohnG Posted August 2, 2022 Report Share Posted August 2, 2022 I’m not convinced it’s a real person. Quote Link to comment Share on other sites More sharing options...
Coop Posted August 2, 2022 Report Share Posted August 2, 2022 ? Quote Link to comment Share on other sites More sharing options...
BillyJack Posted August 2, 2022 Report Share Posted August 2, 2022 Possible has trying to flatten smaller pieces. Now I have used BB plywood so warped it was flat against tge drawer guides but warped badly o the top edge without. Why you never learn a sheet of BB... Wood pro may have read or seen it on Youtube. There may be more information. .. Quote Link to comment Share on other sites More sharing options...
Meatwad Posted August 2, 2022 Author Report Share Posted August 2, 2022 I am not dealing with a very large piece. 12" x 15" roughly. I tried wetting it down and smashing it flat for 24 hours. That mostly worked but I don't think it's worth the trouble for what I need. @BillyJack I took your advice and bought a cheap melamine shelf that was small and already close to the size I needed and it works great. Quote Link to comment Share on other sites More sharing options...
BillyJack Posted August 2, 2022 Report Share Posted August 2, 2022 When you can get it close to the size you want off the shelf and make it work, it's golden...lol Quote Link to comment Share on other sites More sharing options...
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