FILENAMES: PIPEJIG1.JPG PIPEJIG2.JPG PIPEJIG3.JPG PIPEJIG4.JPG PIPEJIG5.JPG PIPEJIG6.JPG DESCRIPTION: These are pictures of a "necessity is the mother of invention" occasion which caused the poster to create a rotary cutting jig from junkyard scrap. Posted by Mr. Shadow . Mr. Shadow provided the following description: ================================================================= Rings of Fire... There I was. Thirty thousand over Tokyo with 2 turning & 2 burning... Er, well, actually.. 49 miles out in the desert with only a torch, some pipe flanges and a automotive/truck parts junk pile. Needed to remove the flanges from some 6" pipe to be re-used for my corner fence posts. Had to remove the welded in (back in the 30's) 6" pipe without ruining the flanges. A quick dive into the automotive junk pile produced one SBC water pump that still had good bearings and a leaky fan thermo-hub. Working off the end of my 'all-purpose + 1' trailer replete with a piece of sacrificial plywood & half dozen 'C'-clamps I rigged up a rotisserie for the flanges and a holding fixture for the torch. This let me cut a 1/4" slice of pipe off cleanly until I got down to the weld bead (large muthas too) at the flange. Then angle the torch 45-deg & slice-cut thru the weld bead at the edge of the flange and release the pipe from the flange. A few whacks with the chipping hammer & the pipe was extracted from the flange. Tomorrow, a grinding job to remove the rust, concrete, slag, etc... and they will be ready for sand-blasting and welding again. Just thought someone else might need to cut a pipe out of a large flange and this little Rube Goldberg apparatus made from a SBC or even a BBC water pump & fan hub works as a smooth rotator & might be useful to them also. Photo's;--- PIPEJIG1.JPG; Flange on rotisserie after first 1/4" slice cut off. PIPEJIG2.JPG; Flange after last 1/4" cut before the 45-deg angle cut. PIPEJIG3.JPG; Flange after 45-deg cut. Note weld bead slag piles. PIPEJIG4.JPG; Flange from bottom after knocking out the residual pipe. PIPEJIG5.JPG; SBC water pump & fan hub (after the '6-Flange War'). PIPEJIG6.JPG; SBC water pump, fan hub & rings of fire (some of them). Note: Found the pipe cut clean and neat. The weld beads would not cut. They just bubbled and fizzled and turned to slag and slid off the flange/pipe into the center and collected on the fan hub. I hit the hub with a cold water dip and most of the slag jumped off the Al. But the heat melted the thermal plug/spring and set the silicon oil on fire inside the hub after the second ring was cut. No big deal. But being able to have the torch at a fixed position and rotate the flange (with one hand while holding down the 'blow-O2' lever on the torch with the other) made cutting the pipe out without ruining the flanges a 'no-brainer'. Humm??? Wonder what I could do with a Plasma Cutter..... Cheers, Mr. Shadow (Ret.)