D-4

MAINTENANCE

D-4

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WIRE DRIVE MOTOR

Periodically inspect the wire drive motor brushes, Figure D.4. Replace the brushes as needed.

CHANGING WIRE FEED GEAR RATIOS

Four wire size conversion kits are available to modify the wire feeder for different size or type electrodes. The kits include drive rolls and guide tubes for the wire specified, as shown in Table D.1.

TABLE D.1 - CONVERSION KITS

Wire Type in. (mm)

Conversion Kit

 

 

3/32-7/32 (2.38-5.56)

T13724-A

Solid or Cored

 

1/16-3/32 (1.59-2.38)

T13724-B

Solid or Cored

 

0.035-0.052 (0.89-1.32)

T13724-C

Solid

 

0.045-0.052 (1.14-1.32)

T13724-D

Cored

 

Refer to Table D.2. Four gear ratios are available: 21:1, 57:1, 95:1, and 142:1. To change the gear ratio, replace the motor pinion and the first reduction gear per the following instructions (Refer to Figures D.4, D.5 and D.6).

NOTE: Any item numbers in parentheses on Figure D.5 refer to item numbers in the task description breakdown.

FIGURE D.5 – CHANGING THE WIRE

FEED GEAR RATIO

 

HEX NUT (11)

 

PLAIN WASHER (9)

 

 

SLOT HEAD

INPUT

 

SCREWS

HELICAL

WIRE

(MOUNTING

GEAR (12)

FEED

SCREWS)

 

GEARBOX

WOODRUFF

KEY (8)

1.Remove the four screws that mount the adapter plate and motor assembly to the gear box. Remove the adapter plate and motor assembly from the gear box.

2.Take the two long screws removed in step 1 and screw one into each of the tapped holes located on the face of fiber input helical gear (12). Insert the screws through the full thickness of the gear, and using a screwdriver wedged between the screws to prevent rotation, remove hex nut (11) that holds the gear to the shaft. Remove plain washer (9).

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TABLE D.2 – WIRE FEED GEAR RATIOS.

Gear

Feed Speed

 

Max Wire Size

 

Range

 

 

in. (mm)

 

Ratio

in/min (m/min)

 

 

 

Cored Wire

 

Solid Wire

 

 

 

 

 

 

 

21:1

100-2070 (2.54-52.58)

0.052

(1.3)

 

0.052

(1.3)

57:1

40-778

(1.02-19.76)

3/32 (3.0)

 

1/16 (1.6)

95:1

22-456

(0.56-11.58)

5/32 (4.0)

 

1/8 (3.2)

142:1

15-300

(0.38-7.62)

5/32 (4.0)

 

7/32 (5.6)

 

 

 

 

 

 

 

 

NA-5

Page 45
Image 45
Lincoln Electric NA-5NF, NA-5SF service manual Wire Drive Motor, Changing Wire Feed Gear Ratios

NA-5S, NA-5N, NA-5SF, NA-5NF specifications

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