Apron Threading Controls
The half nut lever engages the carriage with the leadscrew, which moves the carriage and cutting tool along the length of the workpiece for thread- ing operations (see Figure 88).
Important: Make sure the feed lever and feed selection lever are in the disengaged position before attempting to engage the half nut.
| Feed |
Feed | Selection |
Lever | Lever |
Half Nut |
|
Lever |
|
Disengaged |
|
| Feed |
| Lever |
Engaged |
|
Cross Slide | |
Disengaged | Feed Selection |
| Lever |
Carriage |
|
Disengaged |
|
| Half Nut |
| Lever |
Engaged |
|
Figure 88. Apron threading controls.
Thread Dial |
|
Tools Needed | Qty |
.................................. 1 |
The numbers on the thread dial are used with the thread dial chart to show when to engage the half nut during inch threading. Loosen the hex nut on the thread dial (see Figure 89), pivot the gear teeth so they mesh with the leadscrew threads, then
Note: The thread dial is not used for metric threading or pitch turning. You must leave the half nut engaged from the beginning until the turning is complete for this type of operation.
| Leadscrew |
Hex Nut | Dial Gear |
| Teeth |
Figure 89. Thread dial engaged with the
leadscrew.
When threading, we recommend using the slowest speed possible and avoiding deep cuts, so you are able to disengage the half nut when required and prevent an apron crash!
When the first thread cutting pass is complete, the operator disengages the carriage from the leadscrew using the half nut lever. The operator returns the carriage for the next pass and re- engages the half nut using the same thread dial setting to resume the cut in the previous pass.
Model G0746/G0749 (Mfg. Since 3/13) |