Hey guys...
Dunno if its only me but I'm lost at this unitizing thing
anyone wanna explain it in laymens terms?
Gas System Unitising.
A really FAST way of tightening up yer groups. Usually costs me a couple of large regulars from Tim Horton's at my favorite welding shop here in town. The job is so small, the welders laugh when I offer them a loonie or 2 for their "tacking". Read on !!
We have to unitize this to prevent more rattling around of the barrel components. 2 methods are advocated in the US: USARMY drills and taps 2 screws (can't recall if they are # 8 or # 6) from the rear of the (annealed) front band into the rear of the STAINLESS STEEL gas cylinder, around the permanently imobilized spindle valve.
The second way is the USMC method which involves TIG (not oxy-acetylene) welding the front band to the STAINLESS STEEL gas cylinder body.
NOTE: Norinco Gas Cylinders are NOT Stainless steel but Chro-moly.
Oh yeah, clamp the 2 sum#####es together.... I emphasize that the gas cylinder is stainless material so that the experienced welders lurking in the group will get a "heads up" on the TIG. I've been advising my welder buddies to locate the relief hole "tab" and "tack" (just a little bit) on the front band. This is the vital operation.... Now the remaining tacks can be ABOVE the gas cylinder body, up in the surrounding barrel band at 1000 hrs and 1400 hrs. Can you follow me so far ?
Now take a round file and dress/clean off the alignment of the interior of the front band, hopefully the "C" clamp holding the front band and gas cylinder did not shift on you while welding.
Whoops, warning, I forgot to mention to anneal the front band (before welding) and bend up the steel "tabs" for the handguard..... fat barrel soon to be located there. I use a pair of pliers from Cambodian Tire for this one. Don't scratch the front band and if you do, file off the scars and touch up with Birchwood Casey's cold blue.
Dunno if its only me but I'm lost at this unitizing thing
anyone wanna explain it in laymens terms?
Gas System Unitising.
A really FAST way of tightening up yer groups. Usually costs me a couple of large regulars from Tim Horton's at my favorite welding shop here in town. The job is so small, the welders laugh when I offer them a loonie or 2 for their "tacking". Read on !!
We have to unitize this to prevent more rattling around of the barrel components. 2 methods are advocated in the US: USARMY drills and taps 2 screws (can't recall if they are # 8 or # 6) from the rear of the (annealed) front band into the rear of the STAINLESS STEEL gas cylinder, around the permanently imobilized spindle valve.
The second way is the USMC method which involves TIG (not oxy-acetylene) welding the front band to the STAINLESS STEEL gas cylinder body.
NOTE: Norinco Gas Cylinders are NOT Stainless steel but Chro-moly.
Oh yeah, clamp the 2 sum#####es together.... I emphasize that the gas cylinder is stainless material so that the experienced welders lurking in the group will get a "heads up" on the TIG. I've been advising my welder buddies to locate the relief hole "tab" and "tack" (just a little bit) on the front band. This is the vital operation.... Now the remaining tacks can be ABOVE the gas cylinder body, up in the surrounding barrel band at 1000 hrs and 1400 hrs. Can you follow me so far ?
Now take a round file and dress/clean off the alignment of the interior of the front band, hopefully the "C" clamp holding the front band and gas cylinder did not shift on you while welding.
Whoops, warning, I forgot to mention to anneal the front band (before welding) and bend up the steel "tabs" for the handguard..... fat barrel soon to be located there. I use a pair of pliers from Cambodian Tire for this one. Don't scratch the front band and if you do, file off the scars and touch up with Birchwood Casey's cold blue.
