TEST PROTOCOL

Tool Study Test Protocol Details — Taper Shank Test Fixture Version 2:

PROTOCOL DETAILS
All retention knobs were set up using the same protocol:

  1. All components were cleaned with solvent, blown off with compressed air, and then wiped off using a lint-free cloth.
  2. The test fixture was placed on the toolholder shank and the 3 indicators were set on “0”.
  3. The fixture was removed from the toolholder.
  4. The retention knob was installed in the toolholder to the first torque setting with a socket and torque wrench.
  5. The test fixture was placed on the toolholder shank.
  6. The average readings for the 3 indicators were recorded.
  7. The fixture was removed from the toolholder.
  8. The sockets and torque wrench were used to tighten to the next torque setting.
  9. The test gage was placed on the toolholder shank again.
  10. Again, the average readings for the 3 indicators were recorded.
  11. This entire process was repeated for each torque level setting in the range.
  12. The fixture and retention knob were both removed from the toolholder.
  13. The test fixture was placed on the toolholder shank with no retention knob installed and the 3 indicators were checked to see if they were still set on “0”.

READING THE PDF ~ DETAILS

Page 1 of the PDF lists the test data:

  1. The retention knobs used in the test.
  2. The toolholder in which the knobs were tested (one toolholder per data set).
  3. The readings taken for the series of retention knobs installed in the identified toolholder.

About the Test Data:

  • All retention knobs were checked in the same order with each toolholder.
  • Two retention knobs of the same major brands were checked consecutively.
  • All retention knobs were lightly lubricated with light oil.
  • The toolholders are listed by manufacturer and part number.
  • The torque test ft/lb settings were: 20, 40, 60, and 80.
  • Supporting the test data are graphs of the retention knobs by toolholder manufacturer compared to the J&M Machine High-Torque retention knobs included in the study.
  • There is only one toolholder on each graph.
  • There are a maximum of two retention knobs per manufacturer per graph.
  • A lack of readings on the process sheet indicates that the retention knob failed the test. There are two possible reasons for failure:
    1. The retention knob broke during tightening.
    2. The retention knob could not be tightened because the flats on the retention knob rounded off.

Note: J & M retention knob sockets were used to tighten all the knobs in the test. The torque wrenches used in the test were manufactured by CDI Torque Products Model # 1503MFRPH. (Refer to CDI-Certs.pdf and CWPlasticHandleOpManual.pdf for owner’s manual and certifications.)

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