Cuttermasters Professional JXT - Page 19

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CUTTERMASTER Professional JXT User’s Manual
Page 19
3.1 Grinding the Outside Flutes of Standard End Mills:
Primary and Secondary Angles (Continued)
7. Set the tool on the stylus. Set the end mill on the
stylus closest to the shank end, noticing the freedom
of movement of the air bearing. Always pull back and
to the right when grinding end mills with a standard
spiral, not forward. It is important to keep the end mill
uteonthestyusthroughoutthegrind.Whenpulling
the end mill during the grinding process you want a
slow,smoothmovementtoobtainacleannish.
8. Turn on the motor and take rst grind. Turn on
the motor and advance the grinding wheel (y-axis) un-
til the wheel touches the o.d., and then feed in another
.002 - .003” (.04 - .06mm). Pull the air spindle to the
right, being sure to keep the tool on the stylus, using a
slow, steady movement. It may take a little practice to
get the feel of this. One suggestion is to use a test tool.
9. Index to and grind the next ute. After you pull the
endmillo󰀨thestylus,usethemotorliftlever,orrock
the air bearing back towards you, and position the next
uteonthestylusinthestartingposition.Slowlylower
the air bearing back down into the wheel, and pull the
end mill back as before. Repeat this with all remain-
ingutes.Foralittlebetternishyoucantakea.001”
(.02mm)cleanuppassonalltheutes.
10. Grind the secondary clearance angle. Obtain
the secondary clearance angle from the clearance
angle chart, and set the angle on the motor/spindle
scale accordingly. Proceed to grind the secondary in
the same manner as used to sharpen the primary. To
save time, the best way to do this is to grind one sec-
ondaryclearanceangleononeute,untilthewidthof
the primary angle is the proper size. Then proceed to
sharpentheremainingutes.Becarefulthatyoudon’t
taketoomuch o󰀨,andwipeouttheprimary,or burn
the end mill. The secondary grind is only necessary if
theprimaryistoowide;it’snotanecessitytodothe
secondary grind if the primary is already ground to the
width desired.
Note: Grinding the ends. To grind the ends with the
same set up, proceed to section 3.2. To grind the ends
withtheface ofthewheel(necessaryfor6-uteend
mills, proceed to section 3.3