Manual saddle-type roll calipers with swinging arms, a follower on one side, and a dial indicator on the other side, are the most common devices for measuring roll diameter changes from one station to the next one. The results are used to check straight profile, crown and taper. A manual system is most versatile as it can be used to check rolls on a roll grinder, on the floor, or in the paper machine. PWT/Schönthaler roll calipers are the most stable and accurate ones in the industry.



The deviation values from a linear gauge head, mounted in place of a dial indicator, and a distance encoder can be recorded directly onto a rugged tablet computer with WindowsXP. Measurement results are displayed on the 8.4" display of the tablet as a measurement is taken.


The tablet computer can be used as a stand alone system with roll measurement reports saved on its hard drive and printed out, or the tablet computer can be supplied with an integrated 802.11 wireless network connection, and reports saved on a network server. Optional software can be used to access the reports from other computers on the network.

All the components are off-the-self items as in our systems for the machine mounted roll calipers - no custom made electronics.

The RollTrack® software is the same used with the machine mounted roll calipers. The software is specifically made for roll measurements such as measuring crown, compound crown, straight profile, run-out, and roundness. Elaborate features include: change scale, tolerances, and filtering before and/or after saving a report, a single gauge roundness procedure from a T.I.R. (Total Indicator Reading) measurement, two gage motion measurement, (machine mounted models), caliper tracking, etc.

Print a PDF brochure "Portable RollTrack®" from the Literature page.

Standard sizes of PWT/Schönthaler saddle mikes:
  • Size 0. 40 - 120 mm / 1.6" - 4.7"
  • Size 1. 100 - 450 mm / 4" - 18"
  • Size 2. 175 - 550 mm / 7" - 22"
  • Size 2B. 150 - 620 mm / 6" - 24"
  • Size 3. 200 - 700 mm / 8" - 28"
  • Size 3B. 200 - 800 mm / 8" - 32"
  • Size 3C. 200 - 850 mm / 8" - 33"
  • Size 4. 250 - 850 mm / 10" - 33"
  • Size 5. 300 - 900 mm / 12" - 35"
  • Size 6. 300 - 1000 mm / 12" - 40"
  • Size 7. 300 - 1100 mm / 12" - 43"
  • Size 8. 400 - 1100 mm / 16" - 43"
  • Size 9. 450 - 1200 mm / 18" - 47"
  • Size 10. 700 - 1500 mm / 28" - 59"
  • Size 10B. 700 - 1600 mm / 28" - 63"
  • Size 11. 700 - 1700 mm / 28" - 67"
  • Size 12. 850 - 1900 mm / 33" - 75"
  • Size 13. 900 2300 mm / 35" - 90"

Picture: A saddle mike is being tested at PWT,
which is an ISO certified company.