Originally Posted by ZNR XLR
Reference your post #627 and putting carriage bolts thru the ramp door. I'm thinking about a project to extend my ramp door with a piece of 3/4" plywood to lessen the bottom out potential of my HD Ultra over the threshold between the ramp and garage floor. Part of my plan would use 4 strap hinges bolted onto the top (when closed) of the ramp door. I'm a little anxious about drilling thru the ramp door because I don't know how it's constructed. Did you have any issues drilling thru the door? Probably wasn't necessary to torque the bolts too tightly for your plate holder, but I'm going to need to torque down the strap hinges pretty tightly...they are going to be supporting about 50 lbs of plywood in transport mode. Any feel for the capacity of the door to withstand a healthy torque. Lastly, did you use anything on the bolt hole on the external side to restrict water intrusion into the inside of the door. BTW, appreciate all your posts...you share some really great info that is good to know, even for those of us who aren't as talented as you seem to be at projects.
Hey Z. I appreciate the kind words, but I have learned a lot and have gotten many ideas from other members.
If you are drilling inside the aluminum frame ... into the rubber mat area ... this is what you will find, which drills like a hot knife through butter ... 1) appx 1/16" thick fiberglass, 2) appx 3/16" plywood, 3) 1-1/4" Styrofoam, 4) rubber mat ... all "bonded" together, or so it was when new, but it doesn't stay bonded and is weak.
Per Bulletbob, with the party deck option, there is a thin layer of metal beneath the rubber mat so pointed legs don't dent it.
I wonder how strong the hinge attachment will be? I would probably add a metal plate between the hinges and rubber mat and large washers on the outside ... it would be easy to over torque and compress the foam, so use blue loctite snug up but not compress too much.
I think 3M 5200 is ideal to keep water out... I used Geocel Proflex that I had on hand.
The aluminum edge would be stronger but use care (if you do) and hit the hollow found there that runs lengthwise. If you are drilling the edge let me know and I can measure mine to tell you how far from the ramp edge the hollow channel is on my ramp.