1516 CONTACT INFORMATION For more information please call +44 1530 261 145 or send an email to sales@atagarryson.com Important criteria for the operational application of Karnasch high-performance reamers with internal cooling Karnasch high-performance reamers with internal cooling are tools for precision finishing and therefore should be received in hydro strain chucks, high-precision collet chucks, or in shrink chucks. The extremely high true-running accuracy which is reached with these tool-receiving sockets is of considerable benefit for the processing result. Karnasch high-performance reamers with internal cooling can usually be resharpened several times after reaching the end of the dwell time. It is important to resharpen the high-performance reamers in good time in order to minimise the wear and to optimise the production process. Take advantage of our know-how for your production. If, contrary to expectation, there should be processing problems we have listed several steps for the solution of these problems. A. Bore too large 1. Reamer too big 2. Alignment reamer to machine not precise 3. Built up edge 4. Unsuitable coolant 5. Depth of cut too small B. Bore too small 1. Worn reamer 2. Wrong coolant 3. Depth of cut too small 4. Deformation through fixation of the workpiece C. Tapered bore 1. Faulty alignment 2. Built up edge D. Bore not true, 1. Concentricity a. alignment error too large shows chatter 2. Wrong cutting geometry marks 3. Deformation through fixation of the workpiece E. Surface quality 1. Cutting edges blunt unsatisfactory 2. Reamers does not run true 3. Wrong machining data 4. Bad chip flow (insufficient coolant) F. Feed marks in bore 1. Eccentric spindle or reamer M. Reamers jams 1. Reamers taper too slight because of wear relieving G. Bore bulges 1. Workpiece may be distorted even with large wall thicknesses H. Conical run-in 1. Imprecise alignment Conical run-out 2. Difference between spindle and tool axis 3. Reamer is cutting back K. Bore drifts 1. Not enough preprocessing allowance 2. Faulty preprocessing Problem: Reason: Solution: 1. Use compensation chuck 2. Correct alignment or insert compensation or floating chuck 3/4. Select a different coolant 5. Small reamer, lapping with smaller if necessary 1. Use new reamer 2. Change coolant 3. Change reaming allowance 4. Check the clamping system 1. Reduce axis error to max. 0,005 mm or if that is not possible, use axis-parallel compensation 2. Select a different coolant 1. Reduce clamping pressure or change clamping type 2. Correct alignment or insert compensation or floating chuck 3. Countersink bore 1. Reduce feed 2. Concentrate the coolant 3. Change Vc and f ± 25% 4. Resharpen reamer or replace with new one 1. Reduce axis error to max. 0,005 mm or, if that is not possible, use axis-parallel compensation 1. Increase taper, sharpen reamer 1. Reduce clamping force or change direction of clamping force 1. Correct alignment 2. Correct tool axis/axis alignment 3. Check cutting taper 1. Increase reaming allowance 2. Check preprocessing Practical solutions for carbide reaming problems 11 Index 10 9 OIL 8 7 6 5 4 3 2 1
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