I am glueing 2 pieces of 3/4" MDO back to back to make a 1.5" substrate. I will be using west systems epoxy.
1. Will i have any problems attaching a bracket to the edge with 1/4" lag bolts?
2. How do i clamp something like this (they are approximately 47"x40")? I was thinking about screwing them together on the face and then patching the holes. Any other suggestions would be appreciated.
Thanks, Steve
Posted by Michael Berry (Member # 2604) on :
You should be OK, hopefully you'll be using a SignBrackets bracket Posted by Dave Grundy (Member # 103) on :
Steve why not lay the boards horizontal and weight them down with cement blocks or something like that?
Posted by Steve Racz (Member # 4376) on :
Thanks Mike and Dave!
Dave - Excellent idea - i just wasn't sure how much pressure i needed to put on the wood - Thanks!!!
Posted by Michael Boone (Member # 308) on :
west does not need pressure..it only requires contact to bond...
Posted by Steve Racz (Member # 4376) on :
Thanks Michael. I didn't know that.
I had the two pieces cut by my supplier so that they would match exactly. Turns out there is a slight warp in the MDO so the edges don't sit flat so i'm going to have to do something to hold them together (can't reverse them because they are primed on one side). I don't have enough edge clamps so i'm either going to have to buy some edge clamps or screw them together.
Posted by Rick Sacks (Member # 379) on :
If you're gonna put screw holes in 'em, why not just glue em and screw em to a table top. When dry, remove the screws and fill the holes so mice don't get in.
Posted by Steve Racz (Member # 4376) on :
Rick,
Great idea (except my table top isn't big enough - only 32" wide). I ended up countersinking the screws and filling the heads with epoxy putty.
Thanks, Steve
Posted by John Gresak (Member # 6347) on :
quote:Originally posted by Dave Grundy: Steve why not lay the boards horizontal and weight them down with cement blocks or something like that?
Dave that SOUNDED like a great idea when I did it too. I also glued 2- 3/4" MDO pieces together using "gorilla glue". The blanks were approximately 46" x 46" contour cut pieces. I layed a piece of cardboard on top, with 5 cement blocks on top of that............. 2 hours later when I came back, the pieces had slid, (like a wet water glass on a table) about 2 feet off center.
ps. Anyone who has used "gorilla glue" would know..... it foams up, and expands when curing.
I wasn't a happy camper that day, but was able to pry the pieces apart without harming the faces. (the edges didn't fare so well).
If you don't want to put screws in, then use quick clamps around the edges and the blocks in the center.
Posted by Mark Tucker (Member # 6461) on :
Gorilla Glue is great stuff. Elmer's now makes a urathane glue called "Ultimate Glue" which is the same stuff but a little cheaper. These glues are really fantastic for gluing up HDU scraps and making big pieces out of small ones if your going to CNC rout the HDU. Not so good for sandblasting...
![[Wink]](wink.gif)