Cutting results out of tolerance (standard knifes and BIG 8)

  • Check the squareness of a couple sheets: From corner to opposite corner, and other corner distance also. Compare both measures: The difference should be < 1 mm.
  • Make sure that the lateral position of the sheet stack is correct: Correct the stack position by the handle, until the sheet does < 2 mm lateral movement till the final position before 1. cutting operation.
  • Measure the sheet flow height on the first table: 0.5 mm below cutting level.
  • Stop 1 sheet before the 1. operation – with centering rollers closed – and check the pressure on the spring roller: Too much load on the spring can damage the sheet.
  • The speed of the first cutters (measure on the carbide knife) must be a around 1 m/min less compared with to the speed of the driven conveyor belt.
  • Make sure that both trim-guides (after 1. operation) do have a space of 0.5 mm to the stripe edge!
  • Measure the burrs of all stripes, if necessary grind the knifes!
  • Make sure that one pair of knifes is reverse mounted (helps to guide trim downwards, helps to avoid bow cut).
  • Measure the concentricity of all transport rings, exchange damaged transport rings!
  • Fill-up too big space between the cutters with white guide-rings ! This helps especially for thin sheets and for higher developments. Measure the gap between each guide-rings with feeler-gauge 0.50 mm.
  • Regulate the position of the centering system by the hand wheel, till both trim measure the correct width.
  • Check the parallelism of each trim: Bend the trim, and compare both width and compare them. The result is related to the squarness of the sheets.If the trims are not parallel, it is needed to adjust the alignment of one none spring tensioned support bearing on the centering device.
  • Measure parallelism of all stripes after 1. operation: Target < 0.05 mm!
  • Set the sensors between both overhead conveyors (after 1. operation) correct: The stripes should lateral not move more than 2 mm after being centered by the 2. centering device!
  • Measure the stripe flow height on the second table: 0.5 mm below cutting level!
  • Measure the blank flow height after the 2. operation: 1 – 2 mm below cutting level!
  • Make sure that enough magnets are mounted in the area before the 2. operation, and that the magnets are mounted on the correct positions. Attention: Too much magnet force will cancel the centering device function!
  • Reset the postion of the Linmot infeed device according manual.
  • Reset the postion of the Linmot centering device according manual.
  • Position 1 stripe before the 2. operation – with centering rollers closed – and check the pressure on the spring roller: Too much load on the spring can damage the stripe!
  • Check the spring tension of the push finger on the second operation. Maybe it is to low and the push finger doesn’t go back to the right position after moving back to feed the next stripe.
  • Check the mechanical condition of the push finger. Maybe it is worn out and have to much backlash.
  • The acceleration belt for the second operation must be tensioned.Attention!! If spanner is readjusted, the thread bolt can touch the knives. We recommend to chop the thread bolt or take out the spanner and remove the thread bolt! (related for PowerCUT manufactured before 02.2015.)
  • The speed of the Linmot infeed system during transfer into 2. operation must be correct > Can not be measured.
  • The speed of the second cutters (measure on the carbide knife) must be a around 1 m/min less compared with to the speed of the driven conveyor belt (only if lift-table is in use).
  • Measure the burrs of all stripes, if necessary grind the knifes!
  • Measure the concentricity of all transport rings, exchange damaged transport rings!
  • Make sure that the grooves of all Big8 z-bars are clean!
  • Fill-up too big space between the cutters with white guide-rings! Measure the gap between each guide-rings with feeler-gauge 0.50 mm.
  • Use the SQM measuring device to measure the angular errors of each stripe!
  • Test the angular tolerances by choosing velocity 1, 2 and 3. Report the differences.

Back