MK Products MiniMicro Orbital Weldhead - Manual (Page 13)

Mini Micro ® Owner’s Manual - Page 7 ® ®
Gas Flow Rates
Recommended arc gas fl ow rate is 15 to 20 CFH at 50 PSI with the ACL and
20 CFH with the CobraTig ® 150. Flow rates higher than 25 CFH can create
turbulence within the weldhead chamber and blow the arc about.
Back-up gas fl ow rates are typically between 5 and 20 CFH, depending
on internal volume and component confi guration. Typically, when welding
components with relatively large internal volumes, a separate source for
backup purge gas is recommended.
Weldhead Coolant
Only coolant solutions that are recommended by MK Products, Inc., and/or
its distributors, for use in its products, are suitable for use in the MiniMicro™
®
weldhead. Use a name-brand additive, (which does not contain reactive
sulphur or chlorine and does not react with copper, brass or aluminum) or
create a custom mix using this formula:
A solution of:
3 Quarts (2.85 Liters) Distilled water
1 Quart (.95 Liters) ethylene glycol
1 tsp (5 ml) liquid glycerin.
Tap water should not be used since it may hinder arc starting.
DO NOT USE AUTOMOTIVE ANTI-FREEZE.
This may contain additives that are not compatible with this equipment
And will Void the Warranty.
Section B Operation
Weldhead Calibration
The software program in the orbital welding power-supply provides for
weldhead rotor speed and motor controller calibration. This calibration
program consists of driving the rotor at two predetermined speeds (set by
the operator) for one revolution at each speed. The start and end of each
rotation are detected by the passage of the reed switch or “home” sensor in
the weldhead. The rotation is clocked by the computer and, by process of
adjusting and recalculating, provides very accurate and consistent speeds.
NOTE
IT IS RECOMMENDED THAT THE WELDHEAD BE
CALIBRATED EACH TIME THE SYSTEM IS TURNED ‘ON’.
FAILURE TO CALIBRATE THE WELDHEAD MAY RESULT IN THE
WELDHEAD OPERATING AT A “ROUGH” ADJUSTMENT THAT
MAY NOT PROVIDE CORRECT ROTOR SPEED AGAINST THE
CONTROLLERS DEMAND SPEED.
The following paragraphs describe the weldhead calibration results when
being used on the MK Orbital ACL 200 Amp welding power-supply and the
CobraTig
®
150 welding power-supply.
® ®
Section
A Cont.