Page 648 - Mahr马尔量具完整

Marameter | Self-centering inner measuring device 844 K

High-precision comparative measurements of holes

Inside measuring probes from the 844 K family are 2-point comparative measuring instruments used to determine a
reversing point in a hole by oscillation. This reversal point equates to the minimum and thus the exact bore diameter.

Measuring process
The measuring value is displayed via analog dial comparators or electronic
dial indicators.

Practical tip

An electronic dial indicator such as type 1087 BR or 1087 BRi,
offers the major advantage of being able to automatically record
the reversing point using the MIN function and display an absolute
measuring value on the screen thanks to the PRESET setting.
In addition, you can conveniently and reliably transfer the
measuring data to a PC or a CAQ system by data cable
or Integrated Wireless technology.

Setting the comparative measuring instrument
Setting rings are used to set the instrument to the respective nominal size.

Measuring process
Typical applications of self-centering The reversing point (minimum value)
inside measuring probes is calculated by oscillation in a hole
• Rapid testing of hole diameters .

• Determining roundness and cylindricity deviations
by rotating and moving to other bore depths

Special advantages
Setting rings are used to set the instrument to the respective nominal size.
• Self-centering in the hole
• Fast determination of reversing point by oscillation
• Measuring value displayed immediately
• Ideal for processing measuring values directly especially when used with digital indicating instruments

10 Mahr | Supplementary Catalog 2020 / 2021