CUTTING DISCS & GRINDING WHEELS / 49 www.flexovit.com TROUBLESHOOTING CUTTING OFF WHEELS Wheel does not cut Cause Solution In case of blue cutting: wheel too hard or too thick Use softer or Flexovit Thin Cut wheels, check peripheral speed Cause Solution Peripheral speed too low Increase rpm up to max. (80m/s) Excessive wear Cause Solution In case of white cutting edge: wheel too soft Use harder wheel Cause Solution Operating speed too low Increase rpm up to max (80m/s) Cause Solution Decrease of rpm during cutting Use machine with more power, reduce pressure on the machine Crumbled wheel edge Cause Solution Cutting-off wheel used for grinding operations Use a grinding wheel for grinding operations Cause Solution Workpiece is moving Clamp the workpiece properly Cause Solution Too much side-pressure Add only the radial pressure to the wheel Arborhole or centre break out Cause Solution Wheel sticks in the workpiece/material Use more radial pressure and swing the wheel forwards and backwards Cause Solution Cutting-off wheel used for grinding operations Use a grinding wheel for grinding operations Cause Solution Too much side pressure Add only the radial pressure to the wheel Cause Solution Different diameter top/bottom flange Use flanges with the same diameter • Decide which material is cut most and that you select the most suitable Flexovit wheel in accordance with the application chart in this chapter. To use the right wheel for the right material is very important for the life and cutting/grinding behaviour of the wheel. • Check if the machine is operating correctly and that the machine does not exceed the speed that is indicated on the wheel. • Use the wheel at the recommended speed indicated on the wheel and the maximum operating speed chart that you will find later in this chapter. The troubleshooting guide can easily help you recognise and solve problems. GETTING THE BEST FROM YOUR CUTTING DISCS & GRINDING WHEELS TROUBLESHOOTING GRINDING WHEELS Wheel does not grind Cause Solution Wheel too hard, wheelglazing Use softer wheel Cause Solution Not enough pressure Increase pressure Cause Solution Machine power too low Use machine with more power Cause Solution Loading and wheelglazing (non-ferrous) Use Flexovit Alu wheels which counteracts loading and wheelglazing Excessive wheelwear Cause Solution Wheel too soft Use harder wheel Cause Solution Too much pressure Reduce pressure, let the wheel do the grinding Cause Solution Decrease of peripheral speed Use machine with more power, reduce pressure on the machine Cause Solution Too low peripheral speed Max. 80m/s is optimum speed Crumbled wheel edge Cause Solution Grinding angle too flat Change angle to 30 - 40° Cause Solution Workpiece is moving Clamp the workpiece properly Cause Solution Too much pressure Reduce pressure, let the wheel do the grinding Cracks on the bottom of the wheel Cause Solution Contact area too large Reduce contact area Cause Solution Too much pressure Reduce pressure, let the wheel do the grinding Unbalance Cause Solution Dirty flanges Clean flanges Cause Solution Wheel mounting insecure Tighten flanges Cause Solution Flanges with different diameter Replace flanges CUTTING DISCS & GRINDING WHEELS
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