Change gears charts for metric threading on the 7x mini-lathe

Charts with standard gear set for metric mini-lathes: 20, 20, 30, 35, 40, 40, 45, 50, 50, 60, 60, 80, 80.

To calculate change-gears combination for metric threading on a lathe with metric leadscrew you can use the following formula:
Thread Pitch = ((A/B) x (C/D)) x Leadscrew Pitch (mm)

Change gears charts for metric threading on the 7x mini-lathe

Metric threading on lathes with metric 1.5mm pitch leadscrew

Simplified chart

For the mini-lathe banjo and with the original gear set.

PITCH / MM A B C D ERROR %
0.25 20 60 40 80 0.0000
0.3 40 50 20 80 0.0000
0.35 20 50 35 60 0.0000
0.4 20 60 40 50 0.0000
0.45 20 60 45 50 0.0000
0.5 40 60 30 60 0.0000
0.6 20 60 60 50 0.0000
0.7 35 60 40 50 0.0000
0.75 20 60 60 40 0.0000
0.8 40 60 40 50 0.0000
1 60 45 30 60 0.0000
1.25 40 60 50 40 0.0000
1.5 40 60 60 40 0.0000
1.75 35 60 60 30 0.0000
2 60 50 50 45 0.0000
2.5 50 60 60 30 0.0000
3 40 80 80 20 0.0000
3.5 35 60 80 20 0.0000
4 80 60 60 30 0.0000
4.5 60 80 80 20 0.0000
5 50 30 80 40 0.0000