... -1000 series have done high-end grinding process, why do grinding on the mud pump, the following reasons:1 ... expensive. Until today, only, Baoji, tiger rig, will do this process.2. A new CNC grinding machine which ... German is at least 3 million USD, if we do grinding process on the pump, the cost to ... careful grinding process on pump, but we still do it! Because it is good for end user when pump arrive ...