METRIC THREADING ON LOGAN LATHES


Must include 100 T. and 127 T. Transposing Gears (Accurate)

or may use 37 T. and 47 T. Transposing Gears (2/100 of 1% Inaccuracy)

Caution When cutting metric threads, the Half-Nut cannot be disengaged.
Reverse the spindle direction after retracting the tool at the end of the cut

 

For 9", 10", 11" and 2900 Series 12" Logan Lathes

For 2500 Series 12" and 14" Logan Lathes

100 T

LP-1056

LP-1071

127 T

LP-1057

LP-1072

37 T

LP-1665

N/A

47 T

LP-1666

N/A

Lathes with Quick Change Gear Box:
MM Pitch=(40/Gearbox Setting) X (Stud Gear/Gear Box Gear)

Plain Change Lathes (without Gear Box):
MM Pitch=2.5 X (Stud Gear/Lead Screw Gear)

Typical Diagrams

   

48T Gear Box Gear

60T Gear Box Gear

72T Gear Box Gear

Plain Change Lathes
  MM Pitch

Stud Gear

Gear Box Setting

Stud Gear

Gear Box Setting

Stud Gear

Gear Box Setting

Ratio=Stud Gear/Screw Gear
  0.20    

48

160

    

.08

*

 0.25

24

80

48

128

36

80

.10
  0.30    

72

160

    

.12
* 0.35    

42

80

    

.14
* 0.40    

48

80

    

.16
* 0.45    

54

80

    

.18

*

 0.50

24

40

48

64

36

40

.20
  0.60    

72

80

    

.24
  0.65    

39

40

    

.26
* 0.70    

42

40

    

.28

*

 0.75

36

40

54

48

54

40

.30
* 0.80    

48

40

    

.32
  0.90    

54

40

    

.36

*

 1.00

24

20

48

32

36

20

.40
  1.20    

72

40

    

.48

*

 1.25

24

16

60

32

36

16

.50
  1.30    

39

20

    

.52
  1.40    

42

20

    

.56

*

 1.50

36

20

54

24

54

20

.60

*

 1.75

42

20

42

16

    

.70

*

 2.00

24

10

48

16

36

10

.80
  2.25

54

20

54

16

    

.90

*

 2.50

24

8

60

16

36

8

1.0
  2.75

66

20

66

16

    

1.1

*

 3.00

36

10

54

12

54

10

1.2

*

 3.50

42

10

42

8

    

1.4

*

 4.00

48

10

48

8

72

10

1.6

*

 4.50

54

10

54

8

    

1.8

*

 5.00

48

8

60

8

72

8

2.0

*

 5.50

66

10

66

8

    

2.2

*

 6.00

72

10

72

8

    

2.4

Note: * indicates ISO Standard Metric Pitches.