Smithy Midas 1220 LTD - Manual (Page 85)

• Plain slitting saws are thin, plain milling cutters with only peripheral teeth. The teeth
are fine, and the sides taper slightly toward the hole, giving side relief.
• Slitting saws with side teeth are like side milling cutters and are for deeper slotting and
cut-off operations normally done with plain slitting saws.
• Staggered-tooth slitting saws have peripheral teeth with alternate right and left-hand
helix and alternate side teeth. They are for 0.2" and wider cuts and may do deeper cuts
with standard feeds.
• Screw-slotting cutters are plain slitting saws with fine-pitch teeth that cut slots in screw
heads. Their sides are straight and parallel and offer no side relief.
Angle Milling Cutters
Angle milling cutters, for such operations as cutting V-grooves, dovetails, and reamer
teeth, come as single and double-angle cutters.
• Single-angle cutters have one angular surface. Teeth are on the angular surface and
the straight side, and they usually have 45° or 60° angles.
• Double-angle cutters machine V-grooves. Those with equal angles on both faces
usually have an included angle of 45°, 60°, or 90°.
Form-Relieved Cutters
Formed-tooth cutters machine surfaces with curved outlines. You can sharpen them
without changing the tooth outline. Concave cutters mill convex half-circles; convex
cutters cut concave surfaces.
• Corner-rounding cutters round outside corners.
• Gear cutters cut gear teeth.
• Fluting cutters cut flutes in reamers and milling cutters.
• Formed-tooth cutters come in right and left-hand styles and various special shapes.
Flycutters
With one or more single-point toolbits or cutters, flycutters (Figure 17.9) perform end
milling even though they're not end mills. They take light face cuts from large surface
areas. You must grind the toolbit properly to get correct rake and clearance angles. Grind
toolbits for flycutters as you grind lathe tools (Section Seven).
You can also use flycutters for boring.
Note: When the tool revolves, the cutting tool becomes almost invisible, so be careful.
17: Milling
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