Process

For deep hole drilling, the tool drills to the specified machining depth at the selected spindle speed and feed rate in multi-step operations. The number of infeeds is parameterisable.

The resulting feed depth (drill stroke) is detected internally in the cycle based on the final drilling depth and the number of infeeds. A different feed depth can be defined for the first infeed. If the first feed depth (@P10) is specified but the number of infeeds (@P11) is not parameterised, the parameter @P10 acts as the [mm] input for the resulting feed depth.

Pilot hole

When the optional parameter @P173 is used, any Z position can be taken in an existing pilot hole before the actual drilling process. Please note that the initial speed of the spindle outside the drill hole may not exceed 100 rpm for safety reasons.

When a pilot hole is used, the cycle must be selected with the spindle rotation direction required for machining. To position the tool in the pilot hole, the spindle rotation direction is reversed in the cycle to make plunging into the pilot hole simpler. When the start position is reached in the pilot hole, the original spindle rotation direction and the spindle speed are activated for machining (@P175). The parameter @P176 allows you to define a dwell time that gives the machine time to adjust the spindle speed and the direction of spindle rotation. The dwell time is also used at the base of the hole at the end of the drilling operation to achieve a total spindle stop at the start position of the pilot hole..

When a pilot hole is used, the parameters @P174, @P175 become required parameters. They are used to prevent deformation or damage to very long drilling tools.

Additional through-drilling depth

Parameter @P180 defines an additional through-drilling depth. When this is parameterised, there is an additional infeed after the final drilling depth (@P4) is reached. The additional through-drilling depth is therefore added to the parameterised final drilling depth. Parameter @P181 parameterises a separate feed rate for the through-drilling process.