Smithy GN1300 - Manual (Page 114)

• Geometry-forming endmills form particular geometries. They include ball
endmills, roughing endmills, dovetail endmills, T-slot cutters, keyseat cutters,
and shell endmills.
• Ball endmills cut slots or fillets with a radius bottom, round out pockets and
bottoms of holes, and do diesinking and diemaking. Four-flute ball endmills with
center cutting lips are available.
• Roughing endmills remove large amounts of metal rapidly with minimum
horsepower. They have three to eight flutes. Also called hogging endmills, they
have wavy teeth on their periphery that provide many cutting edge, minimizing
chatter.
• T-slot Cutters cut T-slots. After machining a groove for the narrow part of the
T-slot with an end or side mill, finish up with the T-slotcutter.
• Keyseat cutters cut keyseats for Woodruff keys (shaped like a half circle)
• Shell endmills, which mill wide, flat surfaces, have a hole for mounting on a
short arbor. The center of the shell is recessed to provide space for the screw or
nut that fastens the cutter to the arbor. The teeth are usually helical, and
diameters are as large as 6”.
• Insert-type endmills use replaceable HSS or carbide inserts. Small endmills
use two inserts; larger endmills, three or more.
• Face milling cutters start in size at 2” and have inserted teeth on the
periphery and face. Most of the cutting takes place on the periphery. They are
similar to, but larger than, shell endmills.
Plain Milling Cutters
Plain milling cutters have teeth only on their periphery. Used to mill plain, flat surfaces,
they may combine with other cutters to produce various shapes. Thay are cylindrical and
come in many widths and diameters.
• Light-duty plain cutters for light cuts and fine feeds come in two forms.
Narrow ones have straight teeth parallel to the cutter axis. Wide ones have
helical teeth at a 25° angle. Features include ease of starting cuts, little chatter,
and good surface finishes.
• Heavy-duty plain cutters, or coarse-tooth cutters, come in a larger widths
and have larger and fewer teeth. Strongly supported cutting edges and wide
flutes provide strength and space for heavy chip removal. The helix angle of their
teeth is 25° to 45°.
• Helical plain milling cutters have even fewer and coarser teeth with a helix
angle of 45°-60° or greater. These cutters are for wide, shallow profiling cuts on
brass or soft steel.
Granite 1300 Series Operator’s Manual
A-12 For Assistance: Call Toll Free 1-800-476-4849