Change Gears and Metric Threading
This lathe can cut 29 different metric threads, but gear changes are required to cut all of the listed metric threads. These gear changes take place on the left hand end of the machine (Figure 33).
F
G
Figure 33. Change gear locations.
The chart is divided into 3 main columns. Starting from the left: Gear diagram, Combination of Gears and m/m Per Pitch.
To use the chart:
1.Find the desired pitch in the chart (Figure 34).
Figure 34. Metric thread chart.
2.Below the m/m Per Pitch label are numbers. Find the corresponding number above the desired pitch and change the right hand quick change lever to that position.
3.To the left of the desired pitch is a small col- umn with a letter. This letter indicates place- ment of the left hand quick change lever. Move the lever to the corresponding loca- tion.
4.In the “Combination of Gears” column are 3 small columns. Please note the F and G at the top. The numbers below F and G repre- sent the number of gear teeth on a change gear. Find the required change gears that have the corresponding number of teeth as stated in the chart to the left of the desired pitch.
G4003G Gunsmith's Lathe |