Router Bits Guide - Flipbook - Page 40
REFERENCE
Cutting Diameter
Up to 1/4"
5/16" to 1"
1" to 2-1/4"
2-1/4" to 2-3/4"
3" to 3-3/4"
Max RPM
24,000
21,000
18,000
16,000
12,000
Recommended
18,000 - 21,000
18,000
16,000
14,000
10,000
Chip Load
Tool Dia.
Upcut
1/8" to 3/16"
7/32" to 5/16"
3/8" to 1/2"
5/8" to 3/4"
2 flute
.004 to .006
.007 to .009
.008 to .012
.010 to .014
3 flute
2 flute
.003 to .005
.006 to .008
.007 to .011
.010 to .014
.006 to .010
.008 to .012
First, find the recommended speed range for your particular bit.
Then, find the ideal chip load by locating the proper bit and flute
combination in the chart.
3 flute
To figure out the required feed rate, use the following formula:
Feed Rate (inch per minute – ipm) = RPM x # of flutes x Chip
load.
.006 to .010
.008 to .012
Compression 2+2
3+3
1/4"
3/8" to 1/2"
3/4"
.013 to .018
.012 to .015
.016 to .022
.022 to .025
Actual feed rates will vary depending on machine horsepower, spindle
quality, material being milled, rigidity of the clamps / hold down, etc.
Faster rpm’s will result in a cleaner cut, but will contribute to quicker wear
due to heat and friction. Select the slowest RPM possible for each cutter.
Start at a slower feed rate and rpm than the maximum and work up until
the combination of desired production and cut is accomplished. The following information is to be used as a recommended starting point only
when setting up for your application. Adjustments may still be required to
achieve your desired needs based on material being milled. This information does not guarantee specific results and tool or material damage may
still occur.
How to figure feed rate
Down Cut
Tool Dia.
1/8" to 3/16"
7/32" to 5/16"
3/8" to 1/2"
5/8" to 3/4"
Chip Load, RPM, & Feed Rates:
Example:
If you want the feed rate for a 1/2" 2 flute compression bit do the
following:
18,000 X 2 x .020 = 720ipm feed rate
* Feed rates are for depth of cut = cut diameter
• If depth of cut is 2x cut diameter reduce chipload 25%
• Not recommended for 3x diameter at one pass
for 1+1 compression reduce chip load by 25%
Carbide Tipped
and Solid Carbide Straight Flute Tools
1/4" to 5/16"
3/8" to 1/2"
3/4" to 1"
-1/8" to 2"
.003 to .004
.006 to .009
.008 to .011
.012 to .015
ROUTER BITS
If you can run with less rpm and
get a satisfactory cut, run less.
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