Formula:
Tooth Bite = | Feed Speed (feet/min.) x 12 RPM x Number of Teeth |
Example:
Tooth bite = | 150 x 12 1750 x 26 |
= | 1800 45,500 |
= .039” |
Formula:
Required Gullet = Tooth Bite x Depth of Cut x 1.30
Example:
Required Gullet = .039" x 6" x 1.30 = .304 sq. in.
Steps:
1. Take- a rubbing of gullet shape
2. Place rubbing over 1/4" square engineering paper
3. Count the number of squares in the gullet area
4. Divide that number by 16 (16 is the no. of 1/4" squares per cubic inch)
5. Multiply this number by .70
6. This is your usuable gullet capacity
7. Compare this with the required area figured in #2 above.
Example calculations:
Gullet Area (usable) = | 10 16 |
= .625 x .70 = .437 Sq. In. |
Note: This gullet has sufficient capacity for requirements in above examples.
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