Define feed and product objectives
Ore properties, feed-size distribution, target product size and operating schedule frame crushing and grinding discussions. Appearance or shell dimensions alone do not establish process capability
Distinguish jaw and primary gyratory crushing
Jaw crushers compress feed between fixed and moving jaws; gyratory crushers compress it between a mantle and concaves. Selection depends on feed, duty, installation and maintenance conditions
Review drive and process together
Gear-and-pinion mills require review of drive configuration, lubrication, alignment and maintenance access. Power, drive architecture and scope must follow the grinding duty and actual engineering proposal