Maintaining your machine with dentalcnc

You received a calibration set with your machine which consists of the following components:

• Designated blanks from which the calibration and test specimens are milled
• A designated tool for manufacturing calibration and test specimens
• A micrometer for measuring the calibration and test specimens

Manufacturing calibration and test specimens with dentalcnc is almost the same as machining a standard job, except that you don't create the job with dentalcam, but directly in dentalcnc.

1. Open the dentalcnc Application settings. For this, select the following icon in the main icon bar: 
2. Open the Machine maintenance view. For this, select the following icon in the lower icon bar: 
3. If you want to machine a calibration specimen, select the following icon in the left column:
4. If you want to machine a test specimen, select the following icon in the left column:
• dentalcnc opens the Machining view and adds a job for the test or calibration specimen to the job list.


A job for machining a calibration specimen in the job list

5. Machine the job like any other job. While preparing machining, do the following:
   • Mount / load the calibration blank into the working chamber
   • Insert the calibration tool into the tool magazine of your machine and into the virtual tool magazine in dentalcnc. The tool name is displayed in the default position in the Machining view.
• The machine manufactures the calibration or test specimen. If you machined a calibration specimen, the Enter measuring values of the calibration specimen window opens.
6. Measure the calibration or test specimen as described below.

To measure the calibration or test specimen, you need to use a micrometer.

Never use common measuring instruments such as rulers or calipers for measuring calibration or test specimens. These instruments are too imprecise for this task.

How to use the provided micrometer correctly

If you use the micrometer incorrectly, your measuring values will be imprecise and calibration will fail. Incorrect use of the micrometer is a common cause of machine failure.

The following instructions only apply to the micrometer that was provided with your machine. If you use a different micrometer, refer to its manual.

Overview: Using the provided micrometer correctly

NOTICE

Damaging of the micrometer or the measured object when using the quick drive incorrectly

If you use the quick drive to move the measuring spindle against the anvil or object, the spindle may move against the object with excessive force, which can damage the object and/or micrometer.

• Only use the quick drive when the distance between the measuring spindle and the object/anvil is more than 2 mm.
• If the distance between the measuring spindle and the object/anvil is 2 mm or less, only use the ratchet which has a built-in torque mechanism.

You measure objects with the provided micrometer as follows:

1. Carefully move the measuring spindle against the anvil:
   1. If the measuring spindle and the anvil are more than 2 mm apart, turn the quick driver clockwise until they are 2 mm apart.
      

      2 mm distance between the measuring spindel and the anvil

   2. Turn the ratchet clockwise (slowly) until the measuring spindle touches the anvil and doesn’t move any further.
• You can hear the clicking sound of the torque mechanism. If you continue to turn the ratchet, the distance value on the LCD display shouldn't change.
2. Press and hold the 'ON/OFF SET' button on the micrometer for more than 2 seconds.
• The zero point is set, which is indicated by the number '0.000' on the LCD display.
3. Turn the ratchet counter-clockwise until the measuring spindle and the anvil are 2 mm apart.
4. Turn the quick drive counter-clockwise until the distance between the measuring spindle and the anvil is big enough to safely position the object between the measuring spindle and the anvil.
5. Position the object between the measuring spindle and the anvil in such a way that the object touches the anvil's contact surface. Make sure that the object's surface and the anvil's contact surface are parallel to each other. The object should sit flat on the anvil.


Positioning an object between the measuring spindle and the anvil

6. Carefully move the measuring spindle against the object:
   1. If the measuring spindle and the object are more than 2 mm apart, turn the quick driver clockwise until they are 2 mm apart.
   2. Turn the ratchet clockwise until the measuring spindle touches the object and doesn't move any further.
• You can hear the clicking sound of the torque mechanism. If you continue to turn the ratchet, the distance value on the LCD display shouldn't change.
7. Verify that the object or the micrometer is not tilted. If it is, go back to step 3.


A canted object between the measuring spindle and the anvil

• The correct distance value displays on the LCD display.

Most measuring points on the specimen are marked with symbols:

• Circles (represented in this document as ●)
• Bars (represented in this document as |)

The cube in the middle of most specimens is the measuring spot M (referred to as 'cube M'). There may be additional surfaces, cubes and triangles that you need to measure.

In the following you will find labeled images of calibration and test specimens:

Different calibration/test specimen types

1. Remove the calibration or test specimen from the machine.
2. Separate the individual pieces of the specimen.
3. (Recommended) Put the individual parts of the specimen onto a flat surface so that you can use both hands to handle the micrometer.


Placing the calibration/test specimen onto a flat surface

4. Measure each point at least twice to make sure that the measured values are correct. Record each measuring value on a piece of paper.
5. (Recommended) Label the object as either a calibration specimen or test specimen with a name and date (i.e. 'calibration – June 2017').
6. Measure the height and the width of the measuring points which are labeled with circles.


Measuring the height and width of a cube

7. Measure the height of the measuring points which are labeled with bars.


Measuring the height of a triangle

8. Measure the height and width of the cube M.
   

   Measuring the height and width of the cube M

9. Only when the following points apply, measure the distance between the opposing slanted surfaces:
   • A new Y-end switch or ball screw drive has been installed and the installation instructions direct you to measure these surfaces
   • You measure a calibration specimen

   This measurement is usually done by the service technician who installed the new Y end switch.

   There are 2 pairs of these surface (A, B) that you need to measure (see the corresponding figure:

   

   Measuring the slanted surfaces from different views



Measuring the slanted surfaces with a micrometer

10. If you measured a test specimen, check if you need to calibrate the machine by comparing the measuring values:

Measuring position	K4 edition	N4 / N4+	Z4	K5 /K5+	R5	S1 / S2 / S5
Cube ●	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	–	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm
Cube ●●	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	–	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm
Cube ●●●	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	–	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm
Cube ●●●●	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	–	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm	8.00 mm ±0.05 mm
Difference Triangle | - Triangle ||	max. 0.1 mm	–	–	max. 0.1 mm	max. 0.1 mm	max. 0.1 mm
A	–	–	–	only for calibration	–	only for calibration
B	–	–	–	only for calibration	–	only for calibration
Cube M Height Width	8.00 ±0.05 mm 8.00 ±0.05 mm	8.00 ±0.05 mm 8.00 ±0.05 mm	–	8.00 ±0.05 mm 8.00 ±0.05 mm	8.00 ±0.05 mm 8.00 ±0.05 mm	8.00 ±0.05 mm 8.00 ±0.05 mm
Difference Block | - Block ||	–	max. 0.1 mm	–	–	–	–
X	–	–	20 mm ±0.05 mm	–		–
Y	–	–	18 mm ±0.05 mm	–		–
Z1	–	–	8 mm ±0.05 mm	–		–
Difference Z2 - Z3	–	–	max. 0.1 mm	–		–

Example: The values "Triangle | 7.151mm” and “Triangle || 7.195 mm” differ by less than 0.1 mm (difference: 0.044 mm) and are therefore within tolerance.

The values “Triangle | 6.845 mm” and “Triangle || 6.946 mm” differ by more than 0.1 mm (difference: 0.101 mm) and are therefore out of tolerance.

If all measuring values are withing the range of tolerance, a calibration is not necessary. Otherwise, continue with manufacturing and measuring a calibration specimen.

Never enter measuring values of a test specimen into dentalcnc. This will lead to an erroneous calibration and imprecise manufacturing results.

11. If you measured a calibration specimen, continue with entering the measuring values into dentalcnc.

After having measured the calibration specimen, you need to enter the measuring values in the Enter measuring values of the calibration specimen window. Which values are required depends on the machine-specific calibration specimen so that you may not need to enter all values that are shown below.

Entering measuring values for calibration

• If you need information on where the measuring points are and how to measure them, see this figure.

1. Enter the height and width of all measuring points which are labeled with circles.
2. Enter the height values of all measuring points which are labeled with bars.
3. Enter the height and width value of the cube M.
4. If a new Y-end switch was installed, enter the height values of the slanted surfaces A, B.
5. To confirm your input, select the following icon:
• The current window closes. A dialog window opens.
6. Confirm the current message.
7. To verify that the calibration was successful, machine a test specimen and measure it.