Acer Dynamic 1722S, Operation Manual

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5. Threading
5-1 Leadscrew drive
Move the forward/reverse lever (#4 of item 1-1) to the right will cause the leadscrew to
rotate backward, moving the lever to the left the leadscrew will rotate forward, and when lever
is in neutral, the leadscrew will not turn.
5-2 Threading
1. After selecting the thread to be cut, set the following levers to the appropriate
position: #5, #6 & #7 of item 1-1. (Example 18 TPI, PAE2)
2. Turn off the lathe.
3. Engage the half nut by pushing half nut engagement lever #18 of item 1-1 down,
and please make sure it is fully engaged.
5-3 Thread Chasing Dial
1. Thread Chasing dial for inch leadscrew
To cut even number threads, the leadscrew can be engaged on any number of lines. For
odd number threads, the leadscrew can be engaged on any number. Fractional threads
(1/2, 1/4 etc.) leadscrew can only be engaged on the same number or line.
Note: When cutting metric threads on a lathe with an Inch leadscrew, please be sure the
half nut is engaged at all times (If not, the thread will not repeat).
2. Thread indicator dial for Metric leadscrew cutting metric threads
There are two dials, 2&7 division and 3&5 division for Metric leadscrew
while using Metric thread dial indicator. Use 3&5 division dial for cutting
pitches 1.25, 2.5, 5.0, 2.25, 4.5; for the rest threads, please use 2&7 division
dial.
Example 1 : For cutting pitches 0.5, 0.75, 1.0, 1.5, 2.0, 3.0, 4.0, 6.0, use 14T worm gear and
2&7 division dial. The dial numbers at which the leadscrew nuts may be engaged are 7; that
is, every division can be engaged by leadscrew nuts.