• Parallelism of the rotation axis of a horizontal spindle and the horizontal surface of the working table.
• Parallelism measured with an accuracy of down to 0.001°.
The angle measurement unit is selectable from a list in the settings. It can be changed during measurement.
• One ALiSENSOR™ Level
• The Spindle Parallelism for ALiSENSOR™ Level app installed on an iPod/iPhone/iPad
• A fixture suitable for the specific measurement object
A fixture with a flat horizontal surface and a horizontal spindle bit is recommended for quick and easy use.
The spindle bit should be firmly attached in the chuck, so the spindle bit needs to have a suitable diameter for the machine.
The procedure is essentially composed of two sequential measurements:
1. The perpendicularity of the horizontal surface to the direction of gravity.
2. The perpendicularity of the rotation axis of the spindle to the direction of gravity.
Once the angles relative to a common reference are known, their parallelism is simply calculated as the difference of these values.
To get accurate measurements of the surface angles relative to gravity the procedure includes implicit index calibrations. An uncalibrated fixture will introduce a constant offset to all inclination measurements.
The measurement is made twice in the same place, first in one direction and then in the opposite direction after turning the sensor unit 180°. By calculating the difference between the two inclination values, the fixture offset will cancel itself out. The actual inclination is half of the difference.
Unlike a traditional sprit level the ALiSENSOR™ Level can perform accurate level measurements upside down. As a result of this property, vertical index calibration can be done in addition to traditional horizontal index calibration.

1. Attach the fixture firmly to the ALiSENSOR™ Level. The 3D model in the app shows the Sensor Unit using the standard L-shaped fixture, but for some measurement situations a custom fixture may be more suitable.
2. Turn on the ALiSENSOR™ unit.
3. Pair the ALiSENSOR™ unit with the iPod/iPhone/iPad. See the
ALiSENSOR™ Level manual for full details.
4. Start the Spindle Parallelism app.
5. Follow the instructions given by the app:
Measurement step 1/4:
• Place the sensor unit on the horizontal surface.
• Press the app's measure button when the live value is stable.
Measurement step 2/4:
• Rotate the sensor unit 180° around the axis perpendicular to the horizontal surface and place it in the exact same position.
• Press the app's measure button when the live value is stable.
Measurement step 3/4:
• Attach the unit by putting the spindle bit of the fixture in the spindle chuck.
• Press the app's measure button when the live value is stable.
Measurement step 4/4:
• Rotate the spindle 180° and let the sensor unit rotate with it.
• Press the app's measure button when the live value is stable.
6. The result is shown graphically.
7. Go back and start a new measurement or fill out a report and print, share through email, through third party App like Dropbox, or archive for future reference.
Measurement step 1/4
Measurement step 3/4
Result
Measurement step 2/4
Measurement step 4/4
Report

A) Show saved measurement reports.
B) Battery charge level of connected sensor unit. On a level <10% the symbol changes to red. When charging the symbol is flashing.
C) Show information page with help.
D) Continue ongoing measurement.
E) Select unit system: Metric (mm) or Imperial (inch)
F) Select unit for angles
G) Start new measurement.
A) Return to menu.
B) Create report of current measurement.
C) 3D model of sensor placement. Shows the correct placement of the sensor unit for the current measurement step.
Drag the model to rotate. The orientation of the model affects the result diagram's left/right orientation.
D) Live value of roll angle.
E) Live value of inclination angle.
F) Number of current measurement step.
G) Confirm sensor position and stable measurement value; take measurement.

A) Measurement result diagram. The angle is exaggerated to clearly show the direction of parallelism deviation.
The left/right orientation is based on the orientation of the 3D-model.
B) Create report of current measurement.
C) Result: Parallelism measurement.
A) Fill out the Report.
B) Summary of the measurement data.
C) Add a picture from camera or Photo album.
D) Send as attached file in E-mail, open in another app or print the Report on
AirPrint-printer.