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General Mach Discussion / Re: Perfect Lathe threading
« on: August 13, 2015, 01:28:59 PM »
there are really 2 types of controlled tapping.
rigid tapping -> the z axis is geared to the spindle rotation and follows.
synchronous tapping -> the spindle is in effect a rotary axis and the spindle and z axis do synchronized move (exactly like a z - a move.)
Mach seems to use synchronous tapping. (having a servo spindle that can position well enough to tap)
Linuxcnc can do both - although most use rigid tapping. A spindle that can reverse quickly really doesn't over shoot much. (but you do have to take it into account..)
https://www.youtube.com/watch?v=cGr37Dn6YgM
how about gear hobbing...
https://www.youtube.com/watch?v=ZhICrb0Tbn4
sam
rigid tapping -> the z axis is geared to the spindle rotation and follows.
synchronous tapping -> the spindle is in effect a rotary axis and the spindle and z axis do synchronized move (exactly like a z - a move.)
Mach seems to use synchronous tapping. (having a servo spindle that can position well enough to tap)
Linuxcnc can do both - although most use rigid tapping. A spindle that can reverse quickly really doesn't over shoot much. (but you do have to take it into account..)
https://www.youtube.com/watch?v=cGr37Dn6YgM
how about gear hobbing...
https://www.youtube.com/watch?v=ZhICrb0Tbn4
sam