Grinder Operator

The grinder operator must learn the following skills.

• Learn to operate overhead crane and the use of the proper cables according to the load requirements
• The proper set up of the machine for the roll that is going to be ground, blocks and stands.
• Check the serial number of the roll and match it with the factory order prior to loading the roll in the grinder
• Install proper drive to turn the roll body in the grinder
• Have bearings installed or operator install the bearings on the roll that will be ground if necessary. Proper installation of bearings.
• Stage rolls behind the grinder ( stage next roll to be ground)
• Cleaning and maintaining the grinder
• Report to supervision any issues or problems during the shift with the roll or the grinder
• Work the schedule shift assigned
• Work overtime as requested
• Inventory of grinding belts required
• Learn precision measuring equipment

The actual job duties are listed below after proper training:

• Locate the roll that is next in the schedule and match the serial number of the roll to the factory order.
• Install bearings if required for grinding if not already on the roll.
• Set up the grinder with the proper strands or blocks for the roll to rest on during the grind
• Check the cables for the correct weight of the roll install the cables on the crane and lift the roll and place in the grinder.
• Install proper drive to turn the roll during the grind process
• Check the diameter of the roll on the drive end, center and tailstock end of the roll.
• Install the proper information in the CNC controls of the grinder to perform the grind.
• Adjust the information to be set for the desired crown and tapers.
• Install 36 grit belt and proceed to grind the roll to .125 above customer desired finish.
• Inspect the cover throughout the grinding process for any contamination or issues
• Stop the roll check the hardness to confirm the desired hardness that is stated on the factory order is within tolerance.
• Check the alignment of the roll and make sure the crown profile is correct. Make any adjustments to the end to end alignment or crown as needed.
• Change to the next finer grinding belt and grind the roll to remove the 36 grit scratches
• After he removal of the 36 grit scratches stop the roll, check the crown profile and end to end alignment.
• Proceed to the next finer grit belt and continue to grind the roll to the specified finish stated on the factory order.
• After the grinding of the roll is completed, check crown and alignment with digital calipers and print the profile for attachment to the factory order.
• Take all hardness readings required on all four sides of the roll cover.
• Install the tapers or end relief as stated on the factory order.
• Have supervision or lead person check the roll against the factory and sign off as approved.
• Wrap roll with shrink wrap and remove from the grinder
• Place the roll as close as you can to the next department that will work with this unit.
• Clean the machine and blocks and proceed to the next roll scheduled.

For a regrind of a roll the same steps would be followed with the addition of the incoming crown profile and hardness readings would be obtained and recorded prior to the grinding of the roll.