After a very frustrating session last night, I am here for help.
There's always more to learn, but I am finished with the tail, wings, and half the fuselage on my 7A, so I would figure I have had enough "practice" to be somewhat competent at this point.
I can drive AD3's just fine, but AD4's take an inordinate length of time to set and I often cut up the factory head so badly they have to be drilled out; it's beyond a cosmetic issue.
I see videos where people are setting AD4 rivets in under a second. If I successfully set one, it can take several seconds, all the while increasing the risk of chopping up the head.
I am using:
I've tried between 40 and 100 PSI at the wall along with various settings of the little brass flow restrictor. It seems that enough air pressure to set the rivet makes the gun fly all over the place, and not enough pressure never sets the rivet (perhaps work-hardens it).
I'm pushing the gun as hard as I can against the workpiece, taking care to keep it precisely aligned with the rivet, and using light/medium pressure on the bucking bar.
Any thoughts or tips as to what I could be doing wrong?? I've watched at least a dozen videos, read every article I can Google, etc. I would be very happy to bring my equipment and some scrap to KHAO this weekend if somebody will be around.
Thanks in advance!
There's always more to learn, but I am finished with the tail, wings, and half the fuselage on my 7A, so I would figure I have had enough "practice" to be somewhat competent at this point.
I can drive AD3's just fine, but AD4's take an inordinate length of time to set and I often cut up the factory head so badly they have to be drilled out; it's beyond a cosmetic issue.
I see videos where people are setting AD4 rivets in under a second. If I successfully set one, it can take several seconds, all the while increasing the risk of chopping up the head.
I am using:
- 3x gun from Isham/Planetools.com that's said to make "2,160 blows per minute with a 2-7/8” stroke"
- 1# 6oz tungsten bucking bar (and I tried a heavier steel one the size of a red bull can last night with no different effect)
- Pressure regulator on the wall
- Little brass "flow restrictor" on the gun
I've tried between 40 and 100 PSI at the wall along with various settings of the little brass flow restrictor. It seems that enough air pressure to set the rivet makes the gun fly all over the place, and not enough pressure never sets the rivet (perhaps work-hardens it).
I'm pushing the gun as hard as I can against the workpiece, taking care to keep it precisely aligned with the rivet, and using light/medium pressure on the bucking bar.
Any thoughts or tips as to what I could be doing wrong?? I've watched at least a dozen videos, read every article I can Google, etc. I would be very happy to bring my equipment and some scrap to KHAO this weekend if somebody will be around.
Thanks in advance!
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