Hypertherm HPR800XD Auto Gas Rev.2 - Manual (Page 135)

OperatiOn
HPR800XD Auto Gas – 806500 4-29
Fine Feature cutting
overview
Hypertherm has developed the following processes specifically for cutting mild steel in the 3 mm to 25 mm (0.135
to 1 inch) range of thicknesses. These cut chart settings offer a set of optimal parameters for each thickness and are
designed to achieve:
• Minimum angle deviation
• A sharp top edge
• A visibly smooth, low-gloss finish
Note: All of these Fine Feature cut chart processes were developed for the automatic gas console.
benefits and trade-offs
These Fine Feature processes are ideally suited for jobs in which the greatest importance is placed on achieving the
best possible finish on the cut surface, a sharp top edge, and tighter control on angle deviation.
When these Factors are not critical, refer to the standard quality cut charts in your HPRXD Instruction Manual, which
provide the greatest balance between cut quality and productivity.
In a few cases, two processes are given for a single thickness when performance trade-offs should be considered, such
as between the top-edge quality and the angle of the cut. In general, use the lower amperage process for the best edge
quality and the higher amperage process for the best dross-free cutting performance.
The Fine Feature processes use standard (straight) cutting consumables designed to work best when the torch is
perpendicular to the workpiece. Operators can expect to achieve the same consumable life they currently get using
comparable amperage processes with the standard quality cut charts.
Note: The “pierce complete” (or “pierce control”) signal must be turned off when the shield gas preflow pressure
is lower than the shield gas cutflow pressure (for example, the 80 A processes in the following cut chart).
Recommendations
• Looping corners can be helpful in achieving sharper corners and in some cases minimizing or eliminating low-
speed dross.
• In most cases, these Fine Feature processes employ lower torch-to-work distances than those in the standard
quality cut charts, so a flat and properly leveled workpiece will produce optimal results. Pre-piercing and
subsequent cleaning of the pierce puddles is recommended, whenever possible.
cut charts
The Fine Feature cut chart is listed at the beginning of the mild steel cut charts because it has a range of 30 A to
260 A. It is displayed in two separate tables and is sorted by material thickness: the first table lists the consumable part
numbers to use for each process (metric and English); the second table shows the cutting speeds and the gas and
torch settings required for each process (metric and English).
Note: The marking parameters for the Fine Feature processes covered in this section will be the same as those
detailed in the standard quality mild steel cut charts, which are found in the Operation section of your
HPRXD Instruction Manual.