Jon Elson wrote: > Frank Tkalcevic wrote: > >> >> >> >> Nope, you are exactly right. On both accounts. Turning the spindle by hand >> will make Z move until it gets to the Z specified in G33/33.1 then stop. >> G33.1 will move back, but only when it is within the G33.1 bounds. >> >> > Are you sure? When the tap reaches the commanded depth, the command is > given to reverse the spindle. > EMC has no way to know how long that takes, so it has to continue moving > Z forward until the spindle can slow to a stop and begin reversing. > If the Z feed actually stopped immediately when the depth was reached, > it would break the tap. At least this applies to G33.1 > The behavior should be different between G33 and G33.1 On the G33, it > is assumed you have made provisions for the proper exit of the tool from > the work at the end of the single-point threading pass. On a G33.1, the > tap is buried in the workpiece, and Z MUST stay in sync absolutely until > the tap is fully backed out of the work, no matter how much the spindle > overshoots when it is commanded to reverse. > Rigid tapping is a little bit of a special case. Motion is synched to the forward-moving spindle until the reversal is detected, at which time motion is synched to the reversed spindle. I don't think that Z will track if you manually wiggle the spindle back and forth, in either direction.
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