4
GRINDING THE BOTTOM OF YOUR CHUCK
ANY MAGNETIC CHUCK INSTALLED WITH AN UNTRUE BOTTOM CAN
DISTORT YOUR SURFACE GRINDER TABLE AND EFFECT THE
PERFORMANCE OF YOUR MACHINE FOR LIFE.
In order to achieve the maximum performance of your new Harig® Surface Grinder,
carefully follow these instructions on how to grind the bottom of your magnetic chuck:
1. First, in order to determine if the center of the chuck is high, place the chuck, top
down, on a surface plate. Using a .0001 indicator, press on the chuck in different
areas to check for uneven areas. If you experience rocking you will need to shim
one end so that the chuck will be stable while grinding.
2. To prevent the chuck from further moving while being ground, block each end.
Do not clamp the ends or hold the chuck in place by energizing the chuck
because warping may occur.
3. Using a general-purpose, medium hardness, 46-grit type grinding wheel, wet
grind the chuck with a non-nitrate coolant.
4. Keep your table speed at 20 surface feet. Also keep in mind, the depth of your
cut will vary depending on the grit of your wheel and how much crossfeed is
used.
Once the bottom of the chuck is flat proceed to “Grinding Magnetic Chucks” on page 11
for instructions on how to properly grind the top surface of your chuck.
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