Changing Polarity - MAC TOOLS MW 270 Plus Owner's Manual

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SETTINGS ON THIS CHART ARE STARTING
VALUES ONLY AND ARE BASED ON A 230 INPUT
LINE VOLTAGE. SEE OWNERS MANUAL FOR
MORE INFORMATION.
Select Voltage and Wire Speed Based
on Thickness of Metal Being Welded
1/4"
3/16"
1/2"
3/8"
(12.7mm)
(9.5 mm)
(6.4 mm)
(4.8 mm)
6/100
5/85
4/58
4/50
5/66
5/56
5/50
7/70
7/60
5/40
4/36
5/100
4/85
5/76
4/70
7/100
4/60
4/55
7/82
7/95
7/60
4/50
4/45
5/58
4/50
7/90
6/50
4/38
3/30
7/60
5/46
4/30
3/20
5/100
6/90
5/72
7/75
5/70
4/64
5/38
6/50
5/42
6/45
5/36
4/28
6/18
4/12
5/16
6/64
5/56
4/54
6/60
5/54
4/50
DriveRolls
Example 2/40 =
To read settings:
Number on left of slash
4
5
3
is voltage,numberon
2
right of slash is wire−
1
speed."—" means not
recommended.
VOLTA GE
1/8"
14 ga.
16 ga.
18 ga.
(3.2 mm)
(2.0 mm)
(1.6 mm)
(1.2 mm)
4/75
3/60
3/50
2/36
3/45
3/36
2/22
2/16
4/44
3/30
3/20
2/10
4/34
3/30
3/25
2/20
3/75
3/70
2/50
2/40
3/60
2/46
2/36
1/22
3/48
2/40
2/26
1/10
3/46
3/40
2/30
2/22
2/30
2/20
1/10
1/0
2/20
2/10
1/0
2/0
2/0
4/80
3/60
3/52
2/22
4/60
3/38
3/30
2/18
4/62
3/35
2/20
2/14
4/34
3/32
4/28
3/20
4/12
4/54
3/52
4/50
3/40
Wire Size
V−Grooved .024", .030"/.035"
.024",.045"
V−Knurled .030"/.035"
.039"/.045",.052"/ 1/16"

Changing Polarity

50
60
40
70
30
6
20
80
10
90
W i r e Drive Assembly
WIRE SPEED
L e a d To Positive (+)
O u t p u t Terminal
22 ga.
(0.8 mm)
Wo r k Clamp Lead
1/15
To N e g a t i v e (−)
1/0
O u t p u t Terminal
1/0
Electrode Negative (DCEN): Reverse lead connections
1/22
at terminals from that shown above for gasless flux cored
1/8
wires (FCAW). Drive assembly becomes negative.
1/0
M−25Consumables
A) Nozzle
1/0
.500 orf flush
.500 orf recess
.625 orf flush
.625 orf recess
.625 orf stickout
B) Tips
.023/0.6 mm
.030/0.8 mm
.035/0.9 mm
.045/1.1 mm
C) Contact Tip Adapter
D) Nozzle Adapter
E) Retaining Ring
F) O−Ring
G) Shock Washer
Stock No.
H) Head Tube
202925
Liners
407230−004
.023/.025
193330
.030/.035
.035/.045
193331
A
#200 258
#169 724
B
#169 726
#169 725
#169 727
C
#087 299
#000 067
D
#000 068
E
#000 069
#169 728
F
#169 729
#170 467
G
#170 468
#169 730
#160 731
H
#194 010
#194 011
#194 012
#200785C
200 785-C
OM-219 806 Page 23

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