Threading; Leadscrew Drive; Thread Chasing Dial - Acer Dynamic 1722S Operation Manual

High speed precision engine lathe

Table of Contents

5. Threading

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.

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.

Table of Contents