Positioner

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I think I'm on to something , I'm feeling quite "Big Brained"(Good ideas at work are called "Big Brain Moments")Ive always wanted a thing to hold and rotate "stuff" whilst I'm welding. A few years ago I put an external feed on one of my bigger Migs but kept the motor that turned the wire feed wheel. My cunning plan is to cut off a few bits on it and rewire it in , attach a plate and use the old wire speed knob as speed adjustment.Only down side is it will only spin when the Mig trigger is pulled , but that may be a bonus any way.Plugged it in and it does work that way without interfering with normal operations.Will post pics as it develops.BrettA good guess is better than a bad measurement
Reply:How about a foot pedal?City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:Originally Posted by tanglediverHow about a foot pedal?
Reply:Bugger it didn't work,The knob will go down to stop but on the minimum it is still too fast.A foot control eh? mmmmmA good guess is better than a bad measurement
Reply:The rpm you need to run depends on the diameter of the part you are welding.  Figure that 3 inches per minute surface speed is a good easy TIG welding speed, so if your part is 6 inches in diameter, the rpm would be:(3 inches/minute) / (6 x 3.14 inches/rev) = 0.16 rpmSo if you time one full revolution, it should be:  1/0.16 rev/min = 6.3 min/rev.
Reply:Originally Posted by pulserThe rpm you need to run depends on the diameter of the part you are welding.  Figure that 3 inches per minute surface speed is a good easy TIG welding speed, so if your part is 6 inches in diameter, the rpm would be:(3 inches/minute) / (6 x 3.14 inches/rev) = 0.16 rpmSo if you time one full revolution, it should be:  1/0.16 rev/min = 6.3 min/rev.
Reply:Yep, the irregular shape will make it difficult to mantain a constant surface speed.  Mechanized MIG welds commonly run up around 30 inches per minute for spray or pulsed spray transfer, not sure about short arc transfer travel speeds, but I would guess maybe 1/2 as fast, so maybe around 15 ipm.Looking forward to some photos of what you are doing.
Reply:Brett, if you are doing 40 a week, get them to buy you a positioner!I just got one today.David Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RBrett, if you are doing 40 a week, get them to buy you a positioner!I just got one today.David