© 2016 Nelson Stud Welding, Inc.
Page 13
All Rights Reserved.
February 2016
Part No. 729-110-042 v1.03
3.3 Setting Spring Pressure (Auto-Gap Mode)
3.3.1
Setting Travel/Lift and Spring Pressure in Gap Mode
In the Auto-Gap Capacitor Discharge welding process, the distance the stud is lifted from the work-piece is called
the gap. The plunge rate is affected by the amount of travel and the spring pressure selected. To properly adjust
the lift and spring pressure, it is important to make the adjustments as follows.
Figure 3.4a
Figure 3.3b
Required tools: NCD+ Weld gun, chuck and foot per application, flat bladed screwdriver
1
Ensure the included standard duty gap spring is installed.
2
Section 8.4 Table of Weld Parameters
for the recommended spring pressure and lift.
3
With a flat bladed screwdriver or NCD+ Set-Up Tool #525-001-200, turn the travel adjustment screw on the
back of the weld gun counter clockwise until it stops.
4
Loosen leg screws.
5
Insert stud in chuck.
6
Adjust foot so that the stud-stick out matches the desired plunge.
7
Tighten leg screws to lock tripod foot or spark shield in place.
8
With a stud in the gun, compress the gun against a
non-conductive
block. Trigger the gun to see if the
chuck and stud will retract.
It should not retract.
9
Back the travel adjustment screw out one mark at a time until the position is found where the gun just starts
to lift.
10 From this start point adjust the travel adjustment screw for the desired lift. Each line is equal to
approx .005”
of lift. So for .100” of lift it would be necessary to turn 20 marks. See Fig. 3.3a
11 Turn the spring pressure adjustment knob to desired spring pressure. For the included standard duty
gap
spring each mark equates to .25 lbs of spring force and the minimum is 4 lbs. See Fig. 3.3b
