Page 237 - Parlec Catalog
P. 237
Precision Finish Boring System
Finish Boring Feeds 235
EFFECTS OF FINISH FEED RATES
THE BEST SURFACE FINISH IS PRODUCED WHEN THE TOOL IS FED AT APPROXI-
MATELY 25% OF THE TOOL NOSE RADIUS. THE EFFECT OF CHIP FORMATION OF
THE FEED RATE AND DEPTH OF CUT IS ILLUSTRATED BELOW:
FINISH FEED RATE EFFECTS
Feed Rates/Depth of Cut Result Chip Form Solutions
Chips Bird Nest: 1. Increase Depth of Cut
Low Difficult to Remove 2. Increase Feed Rate
Long Stringy Chips: 1. Increase Depth of Cut
Moderately Low Difficult to Remove 2. Increase Feed Rate
Chips Coil Like a Spring: Keep Running
Ideal Easy to Remove Make Money!
Slight Deformation If Finish is Bad,
Slightly Heavy of Chip Decrease Speed
Deformation of Chip If Finish is Bad,
Heavy Increased Cutting Forces Decrease Speed
Severe Deformation of Chip If Finish is Bad,
Very Heavy Increased Cutting Forces Decrease Speed
Heat Build Up Good Chip for Roughing
Small Depth of cut allows cutting Depth of cut is large enough
forces to push insert out of cut. to prevent cutting forces from
pushing insert our of cut.
A .016 nose radius A .016 nose radius A .016 nose radius
insert fed at .004 insert fed at .008 insert fed at .016
IPR produces a IPR produces a IPR produces a
finish as shown at finish as shown at finish as shown at
the right: the right: the right:
*For best finish, generally feed
at 25% of nose radius.
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