AMPC_US-EN
DRILLING | GEN3SYS® XT Pro and XT High PenetraƟon Replaceable Insert Drilling System
Tap Drill InformaƟon and Formulas | Imperial (inch)
A
American - Unified Inch Screw Thread
Formulas
DRILLING
1. RPM
= (3.82 • SFM) / DIA
Probable Mean Oversize
where: RPM = revoluƟons per minute (rev/min) SFM = speed (Ō/min) DIA = diameter of drill (inch)
Tap Drill Size
Decimal Equivalent
* Theo % Thread
Probable Hole Size
** Probable % Thread
Tap Size 1/2 - 20
29/64
0.4531
72% 72% 83% 87% 70% 65% 79% 72% 87% 75% 65% 72% 84% 77% 72% 72% 77% 75% 76% 65% 84% 67% 72% 72% 82% 77% 67% 87% 72% 67% 87% 72% 76%
0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003
0.4561 0.4754 0.4874 0.5030 0.5148 0.5186 0.5343 0.5499 0.5655 0.5739 0.5811 0.6124 0.6436 0.6526 0.6593 0.6749 0.6905 0.6920 0.7686 0.7843 0.7999 0.8155 0.8624 0.8936 0.8691 0.8780 0.8936 0.9093 0.9249 0.9405 1.0343 1.0499 1.1124
68% 69% 80% 82% 66% 61% 77% 69% 82% 71% 61% 69% 82% 75% 70% 69% 73% 71% 74% 63% 81% 64% 69% 68% 81% 75% 65% 84% 69% 64% 84% 69% 74%
12.0 mm 0.4724
9/16 - 12
31/64
0.4844 0.5000
2. IPM
= RPM • IPR
1/2
where: IPM = inches per minute (in/min) RPM = revoluƟons per minute (rev/min) IPR = feed rate (in/rev) 3. SFM = RPM • 0.262 • DIA where: SFM = speed (Ō/min) RPM = revoluƟons per minute (rev/min) DIA = diameter of drill (inch)
9/16 - 18
13.0 mm 0.5118
31/64 17/32 35/64
0.5156 0.5313 0.5469 0.5625 0.5781 0.6094 0.6406 0.6563 0.6719 0.6875 0.7656 0.7813 0.7969 0.8125 0.8594 0.8906 0.8750 0.8906 0.9063 0.9219 0.9375 1.0313 1.0469 1.1094
B
5/8 - 11 5/8 - 12
9/16
BORING
5/8 - 18
14.5 mm 0.5709
37/64
11/16 - 12 39/64
41/64
3/4 - 10
16.5 mm 0.6496
21/32 43/64 11/16 49/64 25/32 51/64 13/16
4. Thrust
= 153,700 • IPR • DIA • Km
3/4 - 12
where: Thrust
3/4 - 16
= axial thrust (lbs) = feed rate (in/rev)
17.5 mm 0.6890
C
IPR DIA Km
7/8 - 9
= diameter of drill (inch)
= specific cuƫng energy (lbs/in 2 )
REAMING
7/8 - 14
5. Tool Power = .6991 • IPR • RPM • Km • DIA 2 where: Tool Power = tool power (HP) IPR = feed rate (in/rev) RPM = revoluƟons per minute (rev/min) Km = specific cuƫng energy (lbs/in 2 ) DIA = diameter of drill (inch)
15/16 - 12 55/64 15/16 - 20 57/64
22.0 mm 0.8661
1 - 8
7/8
57/64 29/32 59/64 15/16 1-1/32 1-3/64 1-7/64
1 - 12
D
1 - 14
1-1/8 - 12
1-1/4 - 7 BURNISHING
Material Constants
Taper Pipe Thread (NPT)
Probable Mean Oversize
K m (lbs/in 2 )
Tap Drill Size
Decimal Equivalent
* Theo % Thread
Probable Hole Size
** Probable % Thread
Type of Material
Hardness
Tap Size 1/4 - 18 3/8 - 18 1/2 - 14 3/4 - 14
Plain Carbon and Alloy Steel
85 - 200 BHN 0.79 200 - 275 BHN 0.94 275 - 375 BHN 1.00 375 - 425 BHN 1.15
7/16 9/16
0.4375 0.5625 0.7031 0.9063
- - - -
0.003 0.003 0.003 0.003
0.4405 0.5655 0.7061 0.9093
- - - -
45/64 29/32
E
High-Temperature Alloys
- -
1.44 0.72
* Based on nominal tap drill diameter ** Based on 0.003" probable mean oversize
THREADING
Titanium Alloy Stainless Steels
135 - 275 BHN 0.94 30 - 45 RC 1.08 100 - 200 BHN 0.50 200 - 300 BHN 1.08
To calculate the percent of full thread for a given hole diameter:
Cast Iron
(Basic major diameter of thread - Drill hole size) .0130
Copper Alloy
20 - 80 RB 80 - 100 RB
0.43 0.72 0.22 0.16
% Thread =
# of threads per inch •
Aluminum Alloy Magnesium Alloy
- -
X
Notes • The above tap drill informaƟon represents probable thread percentages for the standard tap drills stocked at Allied Machine. Special insert diameters may be required in order to meet a user-specific percentage of thread requirement. • The 0.003 probable mean oversize hole condiƟon is based on opƟmum cuƫng condiƟons. Probable percent of full thread may vary based on less ideal cuƫng condiƟons. • The table and equaƟons on this page are found in the Machinery’s Handbook . Permission to simplify and print the equaƟons is granted by the editor of the Machinery’s Handbook .
SPECIALS
A20: 84
www.alliedmachine.com | 1.330.343.4283
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