Normally on a gyratory the open side setting is maintained, not the closed as you are currently doing. For open side setting a wooden ball on a rope can be used with the crusher stopped. ■

I agree with Mark Solomon. Use alumium foil crunched up into a ball on a rope. I've used this on a 54/74. When you wish to test CSS again, just crunch some more foil on the old ball.

I've used a sililar technique when measuring the manganese profiles on 7' cone crushers. I called it the "silly sausage." A long crunched up ball of aluminium over a plastic pipe. Put it in the open side of the crusher, jog the motor, remove and copy the manganese profile.

Regards

Tim ■

FYI-

Conveyor Dynamics, Inc. (CDI) developed a laser which is motorized on a track that can be lowered into the various positions around the bowl to obtain the geometry with wear features for both mantle and concaves.

The laser is accurate to with about 1mm over its range of vertical motion. The motion starts below the concave and has a stroke of about 2-3 meters. I have a brochure we made for SAG 2001.

You can request the 5-6 year history of its use from Highland Valley Copper in Kamloops BC, Canada or ask me and I might be able to get their details.

They have also published measures in authorship with Univ. of BC, Vancouver. ■