In tangential shaving I tend to cheat by using a "false" gear thickness to minimise cutting air during the to and fro X motion.
Even with a width that makes the cutter fully form the tooth for each tangential pass one hits trouble when moving from the upward facing face to the adjacent downward face. The cutter fouls the tip at one edge. This can be seen in
the relevant code snippet is
Code: Select all
G1 Y-3.964 Z14.158 A30.114 F250
G1 X7.150 F200
G1 Y-5.255 Z16.574 A35.717 F250
G1 X-7.150 F200
G1 Y-1.202 Z-0.406 A-1.200
G1 X7.150
G1 Y-1.392 Z-4.742 A-10.061 F250
G1 X-7.150 F200
G1 Y-1.704 Z-7.064 A-14.851 F250
G1 X7.150 F200
G1 Y-2.223 Z-9.406 A-19.755 F250
G1 X-7.150 F200
G1 Y-2.967 Z-11.769 A-24.821 F250
G1 X7.150 F200
G1 Y-3.964 Z-14.158 A-30.114 F250
The line with blanks before it is the culprit. A and Z are going in a coordinated "straight line" with the centre of the cutter well beyond the blank at X=-7.15 but the cutter still clips the just machined tooth face.
With a given diameter of saw the problem can be avoided by stating the face width is bigger than it really is but this cuts air for both ends of
every tangential shave
I think the change of code to
Code: Select all
G1 Y-5.255 Z16.574 A35.717 F250
G1 X-7.150 F200
G1 Y0.0
G1 Z-0.406 A-1.200
G1 Y-1.202
G1 X7.150
G1 Y-1.392 Z-4.742 A-10.061 F250
would always be safe wherever X ends when switching sides and will have negligible effect on overall machining time.
Sadly I can think of no easy way to identify this context for each tooth in a text editor loop so it's a Gearotic bug or an enhancement request!
John Prentice
In tangential shaving I tend to cheat by using a "false" gear thickness to minimise cutting air during the to and fro X motion.
Even with a width that makes the cutter fully form the tooth for each tangential pass one hits trouble when moving from the upward facing face to the adjacent downward face. The cutter fouls the tip at one edge. This can be seen in
[img]http://www.castlewoodconsultants.com/Misc/ClippedTooth.jpg[/img]
the relevant code snippet is
[code]G1 Y-3.964 Z14.158 A30.114 F250
G1 X7.150 F200
G1 Y-5.255 Z16.574 A35.717 F250
G1 X-7.150 F200
G1 Y-1.202 Z-0.406 A-1.200
G1 X7.150
G1 Y-1.392 Z-4.742 A-10.061 F250
G1 X-7.150 F200
G1 Y-1.704 Z-7.064 A-14.851 F250
G1 X7.150 F200
G1 Y-2.223 Z-9.406 A-19.755 F250
G1 X-7.150 F200
G1 Y-2.967 Z-11.769 A-24.821 F250
G1 X7.150 F200
G1 Y-3.964 Z-14.158 A-30.114 F250 [/code]
The line with blanks before it is the culprit. A and Z are going in a coordinated "straight line" with the centre of the cutter well beyond the blank at X=-7.15 but the cutter still clips the just machined tooth face.
With a given diameter of saw the problem can be avoided by stating the face width is bigger than it really is but this cuts air for both ends of [b]every[/b] tangential shave :(
I think the change of code to
[code]G1 Y-5.255 Z16.574 A35.717 F250
G1 X-7.150 F200
G1 Y0.0
G1 Z-0.406 A-1.200
G1 Y-1.202
G1 X7.150
G1 Y-1.392 Z-4.742 A-10.061 F250
[/code]
would always be safe wherever X ends when switching sides and will have negligible effect on overall machining time.
Sadly I can think of no easy way to identify this context for each tooth in a text editor loop so it's a Gearotic bug or an enhancement request!
John Prentice