Walker Magnetics TURBOMILL 40B - Manual (Page 10)

O.S. WALKER Co. Inc., Turbomill Electroperm Chucks
DD15508M.doc Rev. ~, September 17, 2002
3-1
3 INSTALLATION INSTRUCTIONS FOR MOUNTING THE CHUCK
3.1 Grinding the Mounting Surfaces of Rectangular Chucks
A) Clean and degrease magnetic chuck. Soak chuck with WD-40 and let sit for 15 minutes to
remove kosmolene. (Protective Coating)
B) Check bottom surface for sharp edges or burrs. Use file or oil stone to remove them.
C) Clean the machine's table surface and place the chuck, face down, on the sliding table of
a surface grinder and indicate the surface of the chuck lengthwise and crosswise. Shim
as necessary to level the surface to be ground.
D) Loosely clamp or block each end of the chuck to the table so as not to distort the chuck
and to prevent the chuck from moving while being ground. DO NOT HOLD IN PLACE BY
ENERGIZING THE CHUCK.
E) Grind the bottom surface with a roughly dressed grinding wheel using a general-purpose
medium hardness 36 - 40 grit type-grinding wheel. Wet grind using a semi synthetic,
synthetic, or oil-base coolant.
F) Depth of cut can vary dependant on machine size and wheel type, consult machine
manual or grinding wheel manufacturer.
G) Cross feed-half wheel width per pass dependant on machine and wheel size, consult
machine manual.
H) Table speed should be set at about 75 feet per minute dependant on machine and wheel
size, consult machine manual.
I) Grind to clean bottom of chuck. DO NOT DRY GRIND THE CHUCK.
J) After the base surface has been ground flat, remove the chuck, clean, and dry the
mounting area of the table. Be sure to clean thoroughly freeing from all burrs before
mounting in the normal upright position. Apply a thin coat of light oil to the table surface.
K) Place the chuck on the table with the holding surface up.
L) The clamps provided with rectangular type chucks should initially be tightened only
enough to prevent the chuck from moving. Then the chuck should be aligned with the
table and the clamp bolts gradually tightened in an alternating sequence to a torque of 10
foot-pounds. Then only the bolts on one end of the chuck should be tightened to 15 foot-
pounds. This will allow for expansion without distortion along the chuck length as the
chuck and machine reach their normal operating temperature.
M) At this time, electromagnetic chucks can be turned on and allowed to stabilize at the
"median" temperature of the machine. Normal coolant flow should be used during this
period. Electro-perm magnetic chucks do not contribute heat, but also require a
stabilization to reach the "median" temperature of the machine.
N) Finish grind the surface of the chuck to be assured it is in alignment with the machine axis
following steps E. thru I. for best results.