Matrix 0850 - Handling Grinding Wheels

0850/0850-T1 User Manual
Matrix Machine Tool (Coventry) Limited 40 / 231
Edition: 08/2013
6.3 Handling Grinding Wheels
CAUTION
Never run-up the spindle to maximum speed during the start-up time when it is
cold, otherwise, due to different thermal expansion characteristics in the
bearings, stress conditions are produced, which can cause damage to the
spindle.
If there are any doubts about the way in which the spindle is operating then stop
the cycle immediately!
WARNING!
 DO NOT EXCEED the maximum surface speed (usually specified in m/s) of
the grinding wheel as recommended by the wheel manufacturer.
The maximum surface speed of the grinding wheel is determined by its usable diameter. The table
below shows the max and min wheel diameters permitted on the machine and associated maximum
surface speeds:
Grinding wheel diameter
Max surface speed @ 2000rpm
500mm (max)
52 m/s
400mm (min)
42 m/s
WARNING!
Only grinding wheels with the following tolerances mounted on Matrix flanges
must be used on this machine. Grinding wheels with a coarser and softer
specification than 80L should not be used without reference to either Matrix or
the grinding wheel manufacture.
Width
+/- 0.20mm
bore diameter up to 75mm
+ 0.025mm
+ 0.100mm
bore diameter 125mm to 200mm
+ 0.050mm
+ 0.150mm
bore diameter 225mm to 250mm
+ 0.050mm
+ 0.178mm
The maximum peripheral speed of the grinding wheel is limited to 50m/s when the machine guard
doors are open.
CAUTION!
Only trained persons that have been instructed in the safe mounting
of grinding wheels are allowed to change and mount grinding wheels.
The programmed speed (RPM) of the wheel must NEVER exceed the maximum
speed of the quill that it is fitted to.