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SAMLight Manual > Option MOTF > Examples > Rotational MOTF (RMOTF)

Rotational MOTF (RMOTF)
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Marking on the Fly on a rotary disk is possible for the USC-2/3 cards and serves for marking on the bottom of bottles which are rotated by a disk.

Rotational_MOTF

Figure 371: Setup RMOTF

Figure 371 shows a rotary disk (light blue) which is rotating clockwise. Bottles (dark blue) are rotated by this disk and thereby pass by the scan field (red) with the origin of the coordinate system (0|0). The center of the rotary disk is given in respect to the origin within the scan field.

Please follow the following steps to set up such a system.

1.Step one:

a.Make sure that the proper correction file is applied (in the global settings).

b.Make sure that the optic is calibrated in the static situation, i.e. 1 mm in the software equals 1 mm at the scanner output. Use the field size value for calibration.

c.In figure 371, we use a 100 mm scan field, from -50 mm to 50 mm, so that the origin has the coordinates (0|0).

d.Setup a job that contains a dot with the coordinates of your origin (in our example (0|0), figure 371).

e.Go to the pen settings and enable the drill mode.

f.The drill time, i.e. "Duration", depends on the disk speed.

2.Step two:

a.RMOTF: off → disable Marking On The Fly in the Settings dialog (Settings → System → Optic → Advanced).

b.Rotary disk: runs with a defined speed (deg / s)

c.Start marking

d.The marking result should be a segment of a circle where the distance from the rotary disk center to the origin of the scan field equals the radius.

e.The length of the segment depends on the drill duration and the disk speed.

3.Step three:

a.RMOTF: on → enable Marking On The Fly in the Settings dialog

b.Rotary disk: stands still

c.Enable MOTF, simulation and choose "Rotation". See figure 371 to determine the correct coordinates of the Rotation Point (the point is (-x|-y) in this example).
RMOTF_MOTFSettings
Figure 372: RMOTF Settings

d.Start marking

e.The result should be the same as in step two.

f.If the result is different from step two:

i.The Multiplier takes effect on the length.

ii.The Rotation Point takes effect on the radius.

4.Step four:

a.Repeat step three until you get the same output as in step two. Radius and length must fit.

5.Step five:

a.RMOTF: on → enable Marking On The Fly in the Settings dialog.

b.Rotary disk: runs with a defined speed (deg / s).

c.Correct the Multiplier so that it fits to the disk speed. Note: Consider the algebraic sign!

d.Start marking

e.The marking result must be a point!

6.Step six:

a.RMOTF: on → enable Marking On The Fly in the Settings dialog.

b.Rotary disk: runs with a defined speed (deg / s).

c.Remove the point from the job and draw a square.

d.Start marking

e.The marking result must be a square!