Cutting Metric Threads
Step 1:
Select the desired thread pitch that you wish to cut from the chart
located on the headstock of the Granite 1300 series lathe-mill-drill.
Step 2:
Engage selector levers (1-7) and
selector lever (I-III). Remember, you can use the jog knob located on the right
side of the gear box to help align the gears if the levers are difficult to engage.
Step 3:
Check the gear set-up inside the pulley box to confirm the gearing is
set-up correctly to cut your desired thread pitch. If the gears are not correct,
change gears using the previous procedure.
Step 4:
Confirm that your belt set-up inside the pulley box is properly set-up
to reach the recommended spindle speed for cutting your work piece material
with your specific cutting tool material.
Step 5:
Set your compound angle toolpost to 29-1/2º and install the E8
carbide bit that came with your machine.
Step 6:
Inside the pulley box at the left lower side of the gear cluster is the
inch/metric lever, which must be pulled toward you for metric threading.
Step 7:
Turn your machine on and adjust the variable speed to the
recommended rpm.
Step 8:
Once you have made all of your tooling and machine settings, you are
ready to begin the first pass. Apply firm constant downward pressure on the
half-nut engagement lever until you feel the lever drop into position and the
carriage begins to move.
.
Step 9:
Do not disengage the half nut at the end of the pass, stop your
machine and reverse the feed direction. Rotate the handle on the compound
angle toolpost counter clockwise to back out your cutter.
Step 10:
Restart your machine and bring the cutter back to is original
position. Stop your machine, reverse the direction again.
Step 11:
Feed the cutter in the desired amount for the next cut using the CATP
and restart your machine. Continue this process until you have reached the
desired depth of cut.
10: Threading
10-6
Or Visit www.smithy.com
