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Haas Automation explains how users should carry out directional hole tapping.

A user may often need to complete an extra setup for that one hole at an angle to the surface machined or perhaps a radial hole on a circular component that requires drilling and tapping.

One way to overcome extra setups is to use a fixed-angle tool or an adjustable tool for the most flexibility.

While these tools are readily available from most tooling suppliers, the difficulty can be with the canned cycles in the machine.

These drilling and tapping cycles make the assumption that the drilling or tapping action is going to be performed in the Z-axis direction, which is fine for the majority of cases but is unlikely to be the case.

The programmer could write specific sub-programs and use a floating tap holder to allow for the change in spindle speeds through the tapping cycle.

However, if using a Haas machine, he or she has the general-purpose tapping cycle, G184 for CW tapping, designed by Haas’s control engineers and incorporated into all Haas mills.

With its sister cycle, G174 for CCW threads, these standard features can have a marked effect on programming time and reducing setups.

The G-Code is used to perform rigid tapping for non-vertical holes.

It may be used with a right-angle head to perform rigid tapping along an X or Y vector on a three-axis mill or to perform rigid tapping along an arbitrary vector with a five-axis mill.

The machinist must ensure that the head is positioned correctly before the G184 command is given.

If the head is not aligned with the direction of motion, the tool will break.

Also, he or she must ensure that the ratio between the feed rate and the spindle speed is precisely the thread pitch being cut; otherwise, the threads will be stripped or the tool will break.

This canned cycle is modal in that it will perform tapping each time a new motion is commanded.

However, this will only result in a tapping motion, rather than a repositioning motion.

Therefore, the only use would be for performing deeper taps in the same hole.

The user does not have to start the spindle before this canned cycle.

The control will automatically use the speed specified by the last S command.

Unlike G84, there is no R plane.

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