bearing noise in haas

[Janger]

There is a cricket in my mill drive train. have a listen in the video. I've been told it's spindle bearings. Listening with stethoscope on the spindle holding casting it seems to sound off.
A few things we thought were odd. The belt is not very wide... the pulleys could have a belt twice as wide? why is that? and the belt is riding at the bottom of the pulley which is also odd. the belt is also a bit sticky. I could potentially replace the belt. perhaps with a wider one. I'll have to look in the maintenance manual and see if they list the belt size. What say you?

.mov video attached as zip and and pics.

 

[Janger]

A couple more context shots. I could change the belt, maybe as good preventative maintenance. it would mean taking out the 4 motor bolts. and removing that casting above the spindle for the drawbar mechanism. I could then shuffle the motor over and get the belt off. put on the new one. perhaps measuring where the motor mount is in relation to the Z axis casting and putting it back in the same place. torquing those bolts down to the right torque. I don't think the cricket though is in the belt. Spindle bearings....

 

[Janger]

the haas site says the belt is 21mm. So why is the pulley then twice that thickness?




torque values for bolts: haas torque table

 

[jcdammeyer]

Very strange

 

[Doggggboy]

Is the pulley perhaps common over a few different models just to standardize some parts?

 

[David]

the haas site says the belt is 21mm. So why is the pulley then twice that thickness?

I was wondering the same thing.

 

[Janger]

Is the pulley perhaps common over a few different models just to standardize some parts?

Only one other model uses a bigger belt at 25mm wide. The others use similar or smaller belts.