I want to cut some outside threads on a 5/8 rod. The thread is 5/8-11, the tool is a single point .5 diameter single point thread mill. the depth is -.636. Any help would be appreciated.
Thanks
Mark
Hi Mark,
The following is a slightly simpler method that uses incremental mode in the Helical Milling operation and specifies a number of repeats with an L argument. In this example the centre of the thread is X0.0 Y0.0
In this method, the tool is started from a Z level equal to a number of thread leads from the Z end coordinate. As the lead is 0.0909, seven leads will place the tool at Z0.0. Accordingly, the thread could be started from Z0.0 or Z0.0909 and specify the number of repeat with L7 or L8 respectively.
%
O1000
(CLASS 1A 5/8-11 EXTERNAL THREAD - MINOR DIA. 0.5152)
(DIA. 0.5 SINGLE POINT CARBIDE THREAD MILLING TOOL)
N1 T01 M06
S6000 M03
G00 G90 G54 X0.65 Y0.0
G43 Z0.20 H01 M08
G01 Z0.0 F70.0
G41 X0.2576 D01 F20.0
G91 G02 X0.0 Y0.0 I-0.2576 Z-0.0909 F15.0 L7 (REPEAT 7 X LEAD)
G90 G40 G01 X0.65 Y0.0
G00 Z0.20 M09
G53 G49 Z0.0 M05
M01
%
Chobyn
Your following code will result in a Minor Diameter of 1.013". The max. Major Diameter of a class 1A 5/8-11 external thread is only 0.6234. Accordingly, that code won't touch the OD of the thread unless a much smaller than normal tool comp offset is used.
G1G41D1X.5065F10.(.5135MINOR DIAM)
G2X.5065Y0Z-.0909I-.5065J0
Regards,
Bill