Please check whether Brake is fully released. Check whether manual brake release lever or screw is in release position.

with regards,

C B Ray ■

Please submit a more informative description of the situation to cover at least:

1. Did you replace the entire brake assembly?;
2. If 'yes' then what did you replace it with?;
3. Have you constructed a Holzer table to check the torsional rigidity, or the modern day equivalent. (I haven't done such a check since the late 60's but I do know there is up to date software to do the job.);

If you have a flexible coupling you can alter the stiffness by 'shuffling' the elements about, trying new elements of different hardness/stiffness and in some designs you can even leave out a few of the elements.

It sounds like I am backing the torsional stifness approach doesn't it?

It is highly unlikely that a manufacturer would have to consider examining the out of balance situation...if he expects to retain ISO 9000 certification. Consider the disc as the flywheel that it actually is.

Many thanks for an interesting thread. They are quite rare in recent times. ■

Dear Sathish.

In cases of vibration of rotating equipment, there are 2 possibilities:

1)torsional resonance.

2)misalignment resonance

Torsional resonance vibrations are already covered by Mr louispanjang and can be at non rpm related frequencies.

Misalignment resonance can be caused if the mounting of the disc brake introduces a misalignment.

Misalignment resonance is at the same frequency as the rpm.

Checking the vibration frequency and linking that frequency to the rpm can already be the first indication, where the problem lies.

A vibration specialist with the proper measuring equipment can help you without huge cost involved.

Have a nice day

Teus ■