To minimize scratching, and products should be drilled face up. To minimize chipping and possibly cracking the material when the drill breaks through the back surface, the plastic part must be backed up with soft wood and should be clamped or held firmly.
For small holes power drill should be run at the highest speed available, but should not exceed 3000 RPM. When drilling 3/8" or larger holes, slower drill speeds (1000 to 2000 RPM) will improve the quality of the hole and a hole saw should be used. The feed should not be forced and should be slowed as the drill point penetrates the second surface.
The hole should be oversize to allow thermal movement. The bolts or screws should not be tightened, but should be turned up to the metal (plastic) surface then backed off 1/4 of a turn to allow again for thermal movement.
Countersunk Screws should not be used as they cause and products to crack.
We welcome any questions or comments you may have.
Please feel free to call us toll free @ (800) 250-9269
or use the contact page.
