Hydmech M16A - Page 54

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3.16

CONSISTENT INACCURACY:

(Make sure blade kerf value is correct)

• Change “Actual Pos.” parameter to 1.

This will make the PLC show actual shuttle travel in AUTO

With no material in the machine:

• Program JOB 1 for 2 pieces of 5” length, JOB 2 for 2 pieces of 10” length, and JOB 3 for 2 pieces of a length as

one shuttle will allow.

Enter JOBS 1, 2 and 3 into QUEUE.

Record measurement on the display each time the shuttle vise reaches the target length and closes. It should

equal the required length plus the programmed kerf value. Check that this measurement is +/-.002” for each

length.

If the overshoot /undershoot is very inconsistent, it could be related to an incorrect shuttle cushion period. This

may be caused by “Decel. Dist.” parameter being set too low, defective fast or reverse output relays on the PLC,

or the hydraulic cushion valve (located at the hydraulic manifold) may be faulty.

LINEAR INACCURACY:

• Load machine with a piece of stock for test cutting

• Open parameters screen

• Initiate length calibration and measure cut length as accurately as possible.

• Re-enter new ACT LTH (Actual Length) value

• Re-cut test lengths and check if accuracy is satisfactory.

• Perform test cuts of three different lengths (i.e. 6”, 12”, 20”) and measure as accurately as possible.

• If the measurements indicate a linear problem the ACT LTH should be adjusted.

• With no material in the machine, open parameter screen and initiate the length calibration procedure.

• After the procedure has nished, enter a new ACT LTH value based on the following :

If the error causes part length to get longer as the programmed length is increased, the ACT LTH value should be

increased.

If the error causes part length to get shorter as the programmed length is increased, the ACT LTH value should be

decreased.

Make small adjustments at a time (i.e. .020” - .030”) and recheck test lengths.

EXAMPLE:

If part length error gets longer as the programmed length is increased:

Existing ACT LTH = 33.070”

Change ACT LTH to 33.070 + .030 = 33.100”