|Forum topic by RobH||posted 07-31-2007 04:51 AM||1088 views||0 times favorited||11 replies|
07-31-2007 04:51 AM
Ok, just one more in a string of problems with the bookcase commission. Man, this is one that I am glad will be over with soon.
Ok, the bookcases are 94” tall with a fixed shelf at about 32” up from the floor. then it is approximately 60” to the top of the case. On a couple of the carcases, over this 60”, the side is bowed (yeah Chinese plywood). On one unit, the worst, this bow is about 3/8”.
Now, there will be a face frame on the unit, and there is a back in the unit. The face frame will not be applied until installation. The back will be applied in the shop before installation.
I put the 1/4” plywood back in tonight and squeezed the sides together with a clamp to take the bow out. It did not take much clamp pressure. In fact, I could still pivot the clamp on its jaws with no problem. This successfully took the bow out of the plywood. The back fits into a 1/4” deep 3/8” wide rabbett in the back of the unit.
I am planning on stapling the back every two or three inches with 1/4” narrow crown staples at least 5/8” long.
I am fairly convinced that the back and the face frame together will take the little pressure put on them by straightening out the sides, but I am still a little skeptical. I am afraid the back plywood will start tearing apart.
Because these are built-ins and because of the installation method, I could build a frame around the back of the unit and screw it to the sides to help take the pressure off the back.
Once the shelf units are in place before the face frames are applied, I plan on placing some blocks in the spaces between the shelf units. This will also help take the pressure off.
What do you think? Will the plywood stapled every two or three inches be enough along with the face frame? Would you build a frame around the back just for insurance or not?
Sorry this is so long, but I do need some ideas.
-- -- Rob Hix, King George, VA