Step 5:
Loosen the hex head bolt. This allows the assembly to drop down.
Step 6:
Position the installed B/C gear unit to mesh with the D gear.
Step 6:
Rotate the gear assembly until the B gear meshes with the A gear.
Lock the assembly in place by tightening the hex head bolt.
The hex head bolt also tensions the speed reduction pulley support arm. Be
sure the belts are in the appropriate position before tightening the hex head
bolt.
Cutting Inch 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.
N O T E: The default factory setting is for cutting inch, SAE, threads.
Step 4:
Confirm that your belts inside the pulley box are properly set-up to
reach the recommended spindle speed for cutting your work piece material with
your specific cutter.
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 pushed away from you for inch threading.
Step 7:
Turn your machine on and adjust variable speed to the recommended
speed.
Step 8:
Once you have made all of your tooling and machine settings, you are
ready to begin the first pass. Set the dials on the compound angle toolpost and
cross-slide table to zero. Move the compound angle toolpost into the desired
position and feed the cutter into your workpiece using the small CATP feed
handle. Watch the threading dial rotate until one of the numbers is just about
to the reference mark. At this point 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. (More information to follow on the threading dial.)
10: Threading
10-4
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