robselina
09-11-2004, 08:34 PM
I put this in my jeep journal, but thought I'd share it here too....
I made a rear bumper today. Its only temporary, so I made the mounting system modular and super beefy, so I could just bolt on another design down the line. I want something that will wrap around, but I don't have time to make that right now so this will keep me from smacking my back end on every obstacle (used to have a hitch for a tow point)
Anyway, here's the mount:
http://www.nmt.edu/~rselina/zjbumper1.JPG
The passenger side 2" tube is 12" long, the drivers side is 10" long to clear the fuel lines. The 2" square tubing is 1/4" thick, it's connected by 1/4" thick 2" angle iron and then the tabs on the end of the 2" square stock are made of 3/16" thick 2" flat bar. I didn't brace them on purpose 'cause I want them to have some give....I tapped the 2" square stock so it would take 3/8" fine thread bolts (24 threads per inch). The 2" angle iron is connected to the body in 6 points with 7/16" grade 8 hardware.
http://www.nmt.edu/~rselina/zjbumper2.JPG
Here are finished pics. The 7/16" grade 8 bolts holding the bumper to the mounts have a couple neoprene fender washers between the bumper and mounts, again for a little give. I wanted a little play in the system so I wouldn't put too much stress on the mounts to the body, since that's definitely the weak link in it all.
http://www.nmt.edu/~rselina/zjbumper3.JPG
http://www.nmt.edu/~rselina/zjbumper4.JPG
PS - thanks to Brentt for letting me pick his brain about how he mounted his bumper....
I made a rear bumper today. Its only temporary, so I made the mounting system modular and super beefy, so I could just bolt on another design down the line. I want something that will wrap around, but I don't have time to make that right now so this will keep me from smacking my back end on every obstacle (used to have a hitch for a tow point)
Anyway, here's the mount:
http://www.nmt.edu/~rselina/zjbumper1.JPG
The passenger side 2" tube is 12" long, the drivers side is 10" long to clear the fuel lines. The 2" square tubing is 1/4" thick, it's connected by 1/4" thick 2" angle iron and then the tabs on the end of the 2" square stock are made of 3/16" thick 2" flat bar. I didn't brace them on purpose 'cause I want them to have some give....I tapped the 2" square stock so it would take 3/8" fine thread bolts (24 threads per inch). The 2" angle iron is connected to the body in 6 points with 7/16" grade 8 hardware.
http://www.nmt.edu/~rselina/zjbumper2.JPG
Here are finished pics. The 7/16" grade 8 bolts holding the bumper to the mounts have a couple neoprene fender washers between the bumper and mounts, again for a little give. I wanted a little play in the system so I wouldn't put too much stress on the mounts to the body, since that's definitely the weak link in it all.
http://www.nmt.edu/~rselina/zjbumper3.JPG
http://www.nmt.edu/~rselina/zjbumper4.JPG
PS - thanks to Brentt for letting me pick his brain about how he mounted his bumper....