Originally Posted by pangeaspeed
dude that tank looks so incredibly rad!!!!! i love the center stripe of brass!!!! here is a little tip a dude tought me so that you dont have to do those huge welds on the tunnel, and you dont even have to use heat or a bar to bend it.
i did a little illustration to show what i am talking about.
1. take some 16 or 18 g sheet which ever you prefur. cut it to a rectangle that is a few inches larger then your total tank dimensions.
2. figure out the amount of material that your tunnel is going to use. ie use pie r squared to detremin the circumfrance then divide that by how much of the tube you want.... or just grab a tube and measeure the amount of material to be used.
3. draw a centerline on the rectangle and plot the width of the tunnel down the center of the sheet using the number you just developed.
4. use a break or some 2x4's in a vice to bend 90's on your lines. now you have a u shape, or two 90's facing eachother.
5. the process of bending hardens the material that was bent. (at this point all the metal on the sheet will bend before the 90 degree bends will.) grab the tallest part on the sheet and force them back to the table. (almost like trying to flatten the sheet back to how it came)
6. by doing this the 90s keep a nice clean bend line and the tunnel is formed.
i hope this makes sence. its kinda hard to explaine in words, but if you have ever bent a 90 in sheet metal and then tryed to flatten the sheet back out you will understand.
Thanks for your input pangeaspeed. I've done tanks this way as well, and with out a break, bending the 16g is a damn chore! I saw a tutorial on lowbrow I believe that did the belly that way and it came out very clean.
I've got a sporty tank to narrow, maybe i'll give the one piece belly another shot.