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15
SCREW CUTTING
Essentially, the Saddle will move towards the Headstock under power, the same as cutting using Auto Feed, except the rate of feed is greater, as determined by
the selected gear configuration. The cutting tool, therefore, is moving ever closer to the rotating Chuck.
This Lathe is supplied with a Leadscrew that will produce SAE Threads in a range from 12 to 52 threads per inch. or Metric threads in a range from 0.4-2.0mm
pitch. It is important to remember that the type of thread to be cut, i.e. UNF, BA, BSP, BSW etc., will be totally dependent upon the cutting tool profile, as profiles
differ from thread to thread.
For detailed information regarding screw cutting techniques, cutting tools etc., consult a detailed handbook, a qualified Lathe operating course or obtain advice
from a qualified person.
The general procedure for screw cutting is as follows:
1.
Try to get as much distance from the Chuck to the end of the proposed screw thread as possible, and if the design allows, cut a ‘run-off’ section into the
workpiece which is of a smaller diameter than the root diameter of the proposed screw thread.
NOTE:
For long threads it may be necessary to use a steady rest (not included).
Install the appropriate gears for the thread required, and correctly mount the cutting tool. Set the required depth of cut and position the tool ready to begin
cutting.
NOTE:
Depth of cut is vitally important and may be calculated or obtained from an appropriate reference manual.
2.
Take all necessary precautions previously stated and start the machine with the Automatic Feed Lever in its’ disengaged position
(UP)
.
3.
Engage the Auto-Feed Lever sharply and turn the FORWARD/OFF/REVERSE switch
(C)
to
“FORWARD”
. As the Tool approaches the end of the desired
thread, turn the Switch
(C)
to
“OFF”
. DO NOT disengage the Automatic Feed Lever.
4.
Retract the tool, using the Cross-Slide Feed Handle, noting the exact position on the Scale and the exact number of turns.
5.
Turn the FORWARD/OFF/REVERSE switch
(C)
to
‘REVERSE’
, the Saddle winds back to the beginning then turn the FORWARD/OFF/REVERSE switch
(C)
to
“OFF”
.
6.
Reset the tool by winding IN the Cross-Slide the exact number of turns previously wound OUT and then continue to wind IN the to the desired depth of cut.
7.
Repeat steps 4, 5, 6 & 7. Proceed in this manner until the thread is completed.
This operation requires an advanced degree of experience skill and accuracy and should not be attempted unless you are completely
familiar with all aspects of the Lathe.
Great care and concentration must be exercised to ensure that the Cutting Tool and Chuck do not collide when the machine is
operating, Operator injury and severe damage to the Lathe will likely occur.
