Darryl Keil Last Activity 2021-02-25 11:05 AM
2 replies, 313 viewings

 
back
Navigate threads:
< Previous Thread :: Next Thread >
 
^ Top
Brian Days

Posts: 3

Joined: 2020-03-10

User Profile
 
Subject : laminating plywood
Posted : 2020-10-23 5:54 PM
Post #37962

I am planning on laminating two layers of 9mm baltic to make a substrate with Unibond 800. In case someone is wondering why, this method give me a very flat substrate that I can't get with a single 3/4" plywood substrate.

I have done this many times in the past and didn't concern myself that the two interior layers were facing in the same direction. Every time I discuss this with other woodworkers I get a horrified response that I glued two layers in the same direction but no one can articulate why this would be an issue. My final face veneers are oriented 90 degrees to the substrate face.

I wanted to get opinions if you all felt a breaker layer would be necessary and why?

What would you use for an inexpensive breaker layer if you recommend one?

I also know I could use 3 layers of 6mm but that is more expensive/more labor and feels unnecessary to me.

Thank you,
B


 
^ Top
Darryl Keil

Posts: 1419

Joined: 2003-05-22
Location: Maine

User Profile
 
Subject : RE: laminating plywood
Posted : 2020-10-26 8:38 AM
Post #37966 - In reply to #37962

Every time you add a glue line you gain more stability so adding a cross banding layer in the middle will enhance this. Also, its industry standard to have a odd number of laminations in a lay up. You have two or more glue lines pulling against its opposite with odd number laminations. Is it an absolute must? No, but it can add a extra stability. If you’ve done it before with good results with just two sheets then I wouldn’t worry about it.

Grain going in the same direction in the center of your panel is not such a big deal.


 
^ Top
Brian Days

Posts: 3

Joined: 2020-03-10

User Profile
 
Subject : RE: laminating plywood
Posted : 2020-10-26 2:06 PM
Post #37967 - In reply to #37966

Thank you Darryl. I appreciate your advice on this!


back
Navigate threads:
< Previous Thread :: Next Thread >

Legend      Notification  
Administrator
Forum Moderator
Registered User
Unregistered User
Toggle e-mail notification


Logo by MAZY
Running MegaBBS ASP Forum Software v1.5.14b public beta