The really great thing here is that if you change the speed of the tap you don’t change the feed because it’s the pitch. This means that when you programme your G84 (Tapping Cycle) your feedrate is your pitch. When Rigid Tapping G84 Canned Cycle on a Fanuc, Haas, Mazak or similar control it is best to use G95. These two G codes are your friend when you’re tapping or should I say G95 feed per rev is your friend. G95 feed per rev (feed this amount every revolution) G94 feed per minute (feed is in mm per minute). If you want to know more about G98 and G99 then read the article above. Depending on whether you programme G98 or G99 it will return to either the Z3. On beginning the cycle it will then rapid to what is know as the R Point. In the above cycle the tap will rapid down first to Z3. G94 (Feed per minute) Just another interesting note ( Read This G98 G99) On some Fanuc controls you will need M29 for rigid tapping. Rigid Tapping G84 Canned Cycle, Fanuc, Haas, Mazak. Sorry but you need to look in those boring manuals.
Most modern machines do have Rigid Tapping as standard but the older the machine the less likely it is that you will have it. Peck Tapping of difficult materials is possible (Yes there is such a thing).It is ok to re-tap the same hole if it needs to be deeper.You can control the depth of the thread very accurately.No need for expensive tension and compression tapping heads.Oh and you don’t need to remeasure the tap if you replace it. These make it easy to change and it can’t spin. They are no different to holding in a chuck but you get to use collets for holding the tap. You can buy tapping heads specially for this. The machine spindle locks in with the feedrate just like when you are screw cutting. It can be held in a chuck just like an endmill or a drill. Rigid tapping means the tap can remain rigid throughout the tapping cycle. You mean you didn’t know? Well the first step is admitting you didn’t know. All you need is a bit of knowledge and the right equipment and it’s a dream, an absolute pleasure. Let’s face it tapping on a CNC Machine can be a “right pain in the arse” as we say in the Midlands.
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