Drilling and cutting tools including spade drills, drill inserts and holders

T-A^® Drill Inserts - Carbide

Coolant Recommendations *

Material	Material Hard ness (BHN)	Coolant Pressure (PSI)
		Coolant Volumetric Flowrate (GPM)
		Carbide (TIN, TIAIN & TICN Coated)
		3/8"- 1/2"	33/64"- 11/16"	23/32"- 1"	1"- 1-3/8"	1-13/32" 1-7/8"
Free Machining Steel 1118, 1215, 12L14, etc.	100-250	195	140	160	140	155
Free Machining Steel 1118, 1215, 12L14, etc.	100-250	2.6	3.3	5.5	9	18
Low Carbon Steel 1010, 1020, 1025, 1522, 1144, etc.	85-275	180	105	105	110	115
Low Carbon Steel 1010, 1020, 1025, 1522, 1144, etc.	85-275	2.5	2.9	4.4	8	15
Medium Carbon Steel 1030, 1040, 1050, 1527, 1140, 1151, etc.	125-325	175	100	90	100	75
	125-325	2.5	2.8	4.1	7	13
Alloy Steel 4140, 5140, 8640, etc.	125-375	165	85	100	75	70
Alloy Steel 4140, 5140, 8640, etc.	125-375	2.4	2.6	4.3	6	12
High Strength Alloy 4340, 4330V, 300M, etc.	225-400	160	65	55	40	35
High Strength Alloy 4340, 4330V, 300M, etc.	225-400	2.4	2.3	3.2	5	8
Structural Steel A36, A285, A516, etc.	100-350	175	115	105	75	70
Structural Steel A36, A285, A516, etc.	100-350	2.5	3.0	4.4	6	12
High Temp Alloy Hastelloy B, Inconel 600, etc.	140-310	170	105	100	95	75
High Temp Alloy Hastelloy B, Inconel 600, etc.	140-310	2.5	2.9	4.3	7	13
Stainless Steel 303, 416, 420, 17-4 PH, etc.	135-275	215	150	145	135	90
Stainless Steel 303, 416, 420, 17-4 PH, etc.	135-275	2.8	3.4	5.7	9	14
Tool Steel H-13, H-21, A-4, 0-2, S-3, etc.	150-250	155	60	55	40	35
Tool Steel H-13, H-21, A-4, 0-2, S-3, etc.	150-250	2.4	2.2	3.2	5	8
Aluminum	30-80	320	275	300	250	330
Aluminum	30-80	3.4	4.6	7.5	12	26
Cast Iron	120- 320	160	70	65	50	45
	120- 320	2.4	2.3	3.5	5	10

The coolant pressure and flow rate recommendation above represents a good approximation to obtain optimum tool life and chip evacuation at AMEC recommended speeds and feeds. For a more specific approximation of coolant requirements, consult the formulization below or the AMEC Engineering Department.

Although the above pressure and flow recommendations produce attractive tool life and chip evacuation, the T-A^® Drilling System will still function quite adequately if lower coolant capabilities exist. Call our Engineering Department for specific recommendations.

COOLANT CALCULATIONS *

The proper coolant pressure and volume are critical to the successful application of the T-A^®product line. The following equations will aid you in estimating the coolant parameters for the T-A^®drilling system.

The volume of coolant that can pass through a T-A^® holder per minute is fixed by the pressure of the coolant at the inlet to the holder. The relation between coolant volume and coolant pressure is estimated by:

V_c= Coolant Volume Through the Tool in Gal/Min.

C_x= Holder Correction Factor

Psi= Inlet Coolant Pressure in Psi

How much coolant pressure is needed in a given application is based upon the thermal conductivity of the material being machined and the material removal rate in cubic inches per minute. The material removal rate is calculated by the equation:

MRR = Material Removal Rate in Cubic Inches per minute

IPM = Inch per minute penetration rate.

Dia. = Drill Diameter in inches.

The coolant pressure is then given by the equation:

M = Material Correction

Extended Length Holders

Additional coolant pressure is required when using extended length T-A ^® holders because of pressure losses in the holder and because higher coolant volumes are required to evacuate the chips at the deeper drill depths. Use the given equations to find the estimated coolant pressure and then multiply this value by 1.30 to find the recommended coolant pressure to be used with an extended length holder.

Finally, these equations are based on an engineering model of fluid flow and will only give an estimate of the pressure and volume needed to make your application work effectively. If you have any questions regarding your T-A^®drilling system application please contact the Engineering Department of Allied Machine & Engineering Corp..

* Water Based Coolants Only
A coolant slide chart is also available through AMEC to simplify your coolant needs.

Example #1

A #2 series T-A^®style drill is being used on a 15 HP CNC lathe with a coolant pump that will produce 60 psi and 15 Gal/ Min. How much coolant will pass through the T-A^® style drill holder?

^{Holder Correction

Series
Value
Po

Y
Cx = 0.051
200

Z
Cx = 0.051
150

0
Cx = 0.075
50

1
Cx = 0.116
40

2
Cx = 0.199
20

3
Cx = 0.387
20

4
Cx = 0.559
20

5 and 6
Cx = 1.256
20

7 and 8
Cx = 1.256
20

Example #2

A #2 series T-A^® drill insert is being used on a 15 HP CNC lathe with a coolant pump that will produce 60 psi and 15 Gal/ Min. A 1" diameter hole is being placed in 4140 material at 175 to 225 BHN. What coolant pressure should be used to run the T-A ^® drill insert at recommended speeds and feeds? Can the coolant pump on the machine supply the calculated pressure?

140 SFPM and 0.014 IPR is the recommended speed and feed for this application. This equates to a penetration rate of 7.48 IPM.

The coolant pressure is then given by:}

From example #1 you can see that the pump can force 5.72 Gal/ Min. of coolant through the tool

Material Correction

Material Value

Steel M = 0.7

Stainless Steel M = 1.5

High Temp. Alloys M = 3.0

Aluminum M = 0.25

Cast Iron M = 0.4

Titanium M = 6.0