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General Mach Discussion / Re: Mach3 and Tapmatic Tapping Head
« on: October 25, 2012, 04:44:48 AM »
I have not studied the tapmatic pdf properly but the normal reversing tapping heads I have seen have a cone clutch arrangement in them, when you feed down the cone engages and drives, when you stop feeding the tap is still pulling down due to spindle still rotating and the feed cone will start to disengange. This is where you do your short fast move to take up the slack to quickly engage the reverse cone and the tap rotates the opposite way and you retract at the standard feed.
The feed is based on RPM and Pitch of tap. G95 makes it simple, especially with metric as all you need to do is have your feed at the pitch of the tap being used. If you are using G94 then you will have to calculate what the feed is to be based on the pitch and the RPM the spindle is doing.
As mentioned though you really need to know the true RPM to make it work correctly as without feedback from the spindle you cant be sure the RPM is what has actually been commanded. Two options, use an external tach to see what the actual RPM is or make up a slotted disc with an opto so Mach gets feedback.
Hood
The feed is based on RPM and Pitch of tap. G95 makes it simple, especially with metric as all you need to do is have your feed at the pitch of the tap being used. If you are using G94 then you will have to calculate what the feed is to be based on the pitch and the RPM the spindle is doing.
As mentioned though you really need to know the true RPM to make it work correctly as without feedback from the spindle you cant be sure the RPM is what has actually been commanded. Two options, use an external tach to see what the actual RPM is or make up a slotted disc with an opto so Mach gets feedback.
Hood