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Check list with troubleshooting activities for cam gears

The causes for poor running cam gears or for premature wear are hardly ever caused by just one participating factor, such as e.g. the cam manufacture.
In most cases a combination of causes is the decisive factor. The following check list provides you with a help for dimensioning and troubleshooting.

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1. Motion diagram

  • Have the movement laws been correctly chosen for the application?
  • Shock and jerk-free transitions to adjacent movement sectors?
  • Stroke and cam rotation angle chosen favourably? Are effects in the gear box analysis in the form of unfavourable pressing angles, curvature radii, contact pressures visible.

2. Main dimensions determined in accordance with gear technological requirements?

  • The compressive stress corresponds with the mating of materials roller / cam body?
  • Pressing angle α < 40°?
  • Radius of curvature of the roller centre track ρ : Roller ≤ 0.7 x ρ min?

3. Cam element

  • Computer aided manufacture using modern NC-millingb or grinding machines?
  • Material and heat treatment match the application?
  • Cam width > roller wodth?

4. Forced running guaranteed

  • Frictional connection: Resetting force meets the requirements?
  • Form closure: Frame length or gauge for rollers adjusted without clearance?

5. Design of frame and output elements resistant to twisting?

  • Design with highest possible rigidity?
  • Low clearance in the participating rolling and rotating links?
  • Chain / toothed belt drives have an inelastic retensioning device?
  • Linear output: Sufficient length of plunger guidance?
  • Floating bearing of cam was avoided?
  • Has the installation of vibration dampeners in the machine been planned for the case of occurring external vibrations?

6. Does the roller match the application with respect to diameter and design?

  • Roller with roller bearing?
  • Roller with friction bearing?
  • Spherical running surface?
  • Cylindrical running surface?
  • Material?

7. Torsionally stiff drive?

  • torsional drive shaft?
  • elastic coupling?
  • Damping of resetting forces?
  • Clearance in drive train?

8. Lubricant present in cam joint?

  • Type of lubrication
  • Oil bath, drip lubrication, half grease?
  • Mixed lubrication?