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A disk drive head stack assembly includes an actuator arm tip that includes a swaging hole centered about a swaging axis. A first suspension assembly has a first swage boss that protrudes into the swaging hole. A second suspension assembly has a second swage boss that protrudes into the swaging hole

A disk drive head stack assembly includes an actuator arm tip that includes a swaging hole centered about a swaging axis. A first suspension assembly has a first swage boss that protrudes into the swaging hole. A second suspension assembly has a second swage boss that protrudes into the swaging hole and does not contact the first swage boss. Each of the first and second swage bosses includes an inner lip that extends radially closer to the swaging axis than any other part of that swage boss. The inner lip thickness of the first swage boss, measured parallel to the swaging axis, increases more greatly with increasing radial distance from the swaging axis than does the inner lip thickness of the second swage boss.

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1. A disk drive comprising: a disk drive base;a rotary spindle attached to the disk drive base;a disk attached to the rotary spindle;a head stack assembly attached to the disk drive base, the head stack assembly comprising: a first actuator arm, having a first actuator arm tip that includes a first

1. A disk drive comprising: a disk drive base;a rotary spindle attached to the disk drive base;a disk attached to the rotary spindle;a head stack assembly attached to the disk drive base, the head stack assembly comprising: a first actuator arm, having a first actuator arm tip that includes a first swaging hole, the first swaging hole being centered about a swaging axis;a first suspension assembly having a first swage boss that protrudes into the first swaging hole, the first swage boss being annular about the swaging axis, a first read head being attached to the first suspension assembly; anda second suspension assembly having a second swage boss that protrudes into the first swaging hole, the second swage boss being annular about the swaging axis, the second swage boss not contacting the first swage boss;wherein the first swage boss includes a first inner lip, the first inner lip extending radially closer to the swaging axis than any other part of the first swage boss, the first inner lip defining a first inner lip thickness measured parallel to the swaging axis;wherein the second swage boss includes a second inner lip, the second inner lip extending radially closer to the swaging axis than any other part of the second swage boss, the second inner lip defining a second inner lip thickness measured parallel to the swaging axis; andwherein the first inner lip thickness increases more greatly with increasing radial distance from the swaging axis than does the second inner lip thickness. 2. The disk drive of claim 1 wherein an increase of the first inner lip thickness with increasing radial distance from the swaging axis defines a first taper angle, an increase of the second inner lip thickness with increasing radial distance from the swaging axis defines a second taper angle, and wherein the first taper angle is greater than the second taper angle by at least 4 degrees. 3. The disk drive of claim 1 wherein the second inner lip thickness at an extent of the second inner lip that is closest to the swaging axis is greater than the first inner lip thickness at an extent of the first inner lip that is closest to the swaging axis. 4. The disk drive of claim 3 wherein the second inner lip thickness at an extent of the second inner lip that is closest to the swaging axis is at least 30 microns greater than the first inner lip thickness at an extent of the first inner lip that is closest to the swaging axis. 5. The disk drive of claim 1 wherein the first swage boss protrudes from a first swage mount of the first suspension assembly, the first swage mount including a first flat face that faces the first actuator arm tip, andthe second swage boss protrudes from a second swage mount of the second suspension assembly, the second swage mount including a second flat face that faces the first actuator arm tip, andthe first swage boss defines a first swage boss radial thickness measured along a first radius that extends from the swaging axis and is tangent to the first flat face, andthe second swage boss defines a second swage boss radial thickness measured along a second radius that extends from the swaging axis and is tangent to the second flat face, andthe first swage boss radial thickness is greater than the second swage boss radial thickness. 6. The disk drive of claim 5 wherein the first swage boss radial thickness is at least 50 microns greater than the second swage boss radial thickness. 7. The disk drive of claim 1 wherein the first actuator arm tip defines a first actuator arm tip thickness that is bisected by a first half-thickness plane, the first half-thickness plane being normal to the swaging axis, andthe first swage boss includes a first apex face, no surface of the first swage boss being closer to the first half-thickness plane than the first apex face, andthe second swage boss includes a second apex face, no surface of the second swage boss being closer to the first half-thickness plane than the second apex face, andwherein a first relief angle between the first apex face and the first half-thickness plane is at least 4 degrees greater than a second relief angle between the second apex face and the first half-thickness plane. 8. The disk drive of claim 1 wherein the head stack assembly further comprises: a second actuator arm, having a second actuator arm tip that includes a second swaging hole, the second swaging hole being centered about the swaging axis;a third suspension assembly having a third swage boss that protrudes into the second swaging hole, the third swage boss being annular about the swaging axis; anda fourth suspension assembly having a fourth swage boss that protrudes into the second swaging hole, the fourth swage boss being annular about the swaging axis, no swage boss being in contact with any other swage boss;wherein the third swage boss includes a third inner lip, the third inner lip extending radially closer to the swaging axis than any other part of the third swage boss, the third inner lip defining a third inner lip thickness measured parallel to the swaging axis;wherein the fourth swage boss includes a fourth inner lip, the fourth inner lip extending radially closer to the swaging axis than any other part of the fourth swage boss, the fourth inner lip defining a fourth inner lip thickness measured parallel to the swaging axis; andwherein the third inner lip thickness increases more greatly with increasing radial distance from the swaging axis than does the fourth inner lip thickness. 9. The disk drive of claim 8 wherein an increase of the first inner lip thickness with increasing radial distance from the swaging axis defines a first taper angle,an increase of the second inner lip thickness with increasing radial distance from the swaging axis defines a second taper angle,an increase of the third inner lip thickness with increasing radial distance from the swaging axis defines a third taper angle,an increase of the fourth inner lip thickness with increasing radial distance from the swaging axis defines a fourth taper angle, andwherein the first taper angle is greater than the second taper angle by at least 4 degrees, andwherein the third taper angle substantially equals the first taper angle, and the fourth taper angle substantially equals the second taper angle. 10. The disk drive of claim 8 wherein the fourth inner lip thickness at an extent of the fourth inner lip that is closest to the swaging axis is at least 30 microns greater than the third inner lip thickness at an extent of the third inner lip that is closest to the swaging axis. 11. The disk drive of claim 8 wherein the first swage boss protrudes from a first swage mount of the first suspension assembly, the first swage mount including a first flat face that faces the first actuator arm tip, andthe second swage boss protrudes from a second swage mount of the second suspension assembly, the second swage mount including a second flat face that faces the first actuator arm tip, andthe third swage boss protrudes from a third swage mount of the third suspension assembly, the third swage mount including a third flat face that faces the second actuator arm tip, andthe fourth swage boss protrudes from a fourth swage mount of the fourth suspension assembly, the fourth swage mount including a fourth flat face that faces the second actuator arm tip, andthe first swage boss defines a first swage boss radial thickness measured along a first radius that extends from the swaging axis and is tangent to the first flat face, andthe second swage boss defines a second swage boss radial thickness measured along a second radius that extends from the swaging axis and is tangent to the second flat face, andthe third swage boss defines a third swage boss radial thickness measured along a third radius that extends from the swaging axis and is tangent to the third flat face, andthe fourth swage boss defines a fourth swage boss radial thickness measured along a fourth radius that extends from the swaging axis and is tangent to the fourth flat face, andthe first swage boss radial thickness is at least 50 microns greater than the second swage boss radial thickness, andthe third swage boss radial thickness substantially equals the first swage boss radial thickness, andthe fourth swage boss radial thickness substantially equals the second swage boss radial thickness. 12. The disk drive of claim 11 wherein the first, second, third, and fourth flat faces are substantially parallel to each other, and wherein the second flat face faces the third flat face, and wherein the first flat face faces away from the second flat face, and wherein the fourth flat face faces away from the third flat face. 13. The disk drive of claim 8 wherein the second actuator arm tip defines a second actuator arm tip thickness that is bisected by a second half-thickness plane, the second half-thickness plane being normal to the swaging axis, andthe third swage boss includes a third apex face, no surface of the third swage boss being closer to the second half-thickness plane than the third apex face, andthe fourth swage boss includes a fourth apex face, no surface of the fourth swage boss being closer to the second half-thickness plane than the fourth apex face, andwherein a third relief angle between the third apex face and the second half-thickness plane is at least 4 degrees greater than a fourth relief angle between the fourth apex face and the second half-thickness plane. 14. The disk drive of claim 13 wherein the first actuator arm tip defines a first actuator arm tip thickness, and wherein the second actuator arm tip thickness substantially equals the first actuator arm tip thickness. 15. A head stack assembly (HSA) for a disk drive, the HSA comprising: a first actuator arm, having a first actuator arm tip that includes a first swaging hole, the first swaging hole being centered about a swaging axis;a first suspension assembly having a first swage boss that protrudes into the first swaging hole, the first swage boss being annular about the swaging axis, a first read head being attached to the first suspension assembly; anda second suspension assembly having a second swage boss that protrudes into the first swaging hole, the second swage boss being annular about the swaging axis, the second swage boss not contacting the first swage boss;wherein the first swage boss includes a first inner lip, the first inner lip extending radially closer to the swaging axis than any other part of the first swage boss, the first inner lip defining a first inner lip thickness measured parallel to the swaging axis;wherein the second swage boss includes a second inner lip, the second inner lip extending radially closer to the swaging axis than any other part of the second swage boss, the second inner lip defining a second inner lip thickness measured parallel to the swaging axis; andwherein the first inner lip thickness increases more greatly with increasing radial distance from the swaging axis than does the second inner lip thickness. 16. The HSA of claim 15 wherein an increase of the first inner lip thickness with increasing radial distance from the swaging axis defines a first taper angle, an increase of the second inner lip thickness with increasing radial distance from the swaging axis defines a second taper angle, and wherein the first taper angle is greater than the second taper angle by at least 4 degrees. 17. The HSA of claim 15 wherein the second inner lip thickness at an extent of the second inner lip that is closest to the swaging axis is at least 30 microns greater than the first inner lip thickness at an extent of the first inner lip that is closest to the swaging axis. 18. The HSA of claim 15 wherein the first swage boss protrudes from a first swage mount of the first suspension assembly, the first swage mount including a first flat face that faces the first actuator arm tip, andthe second swage boss protrudes from a second swage mount of the second suspension assembly, the second swage mount including a second flat face that faces the first actuator arm tip, andthe first swage boss defines a first swage boss radial thickness measured along a first radius that extends from the swaging axis and is tangent to the first flat face, andthe second swage boss defines a second swage boss radial thickness measured along a second radius that extends from the swaging axis and is tangent to the second flat face, andthe first swage boss radial thickness is greater than the second swage boss radial thickness. 19. The HSA of claim 18 wherein the first swage boss radial thickness is at least 50 microns greater than the second swage boss radial thickness. 20. The HSA of claim 15 further comprising: a second actuator arm, having a second actuator arm tip that includes a second swaging hole, the second swaging hole being centered about the swaging axis;a third suspension assembly having a third swage boss that protrudes into the second swaging hole, the third swage boss being annular about the swaging axis; anda fourth suspension assembly having a fourth swage boss that protrudes into the second swaging hole, the fourth swage boss being annular about the swaging axis, no swage boss being in contact with any other swage boss;wherein the third swage boss includes a third inner lip, the third inner lip extending radially closer to the swaging axis than any other part of the third swage boss, the third inner lip defining a third inner lip thickness measured parallel to the swaging axis;wherein the fourth swage boss includes a fourth inner lip, the fourth inner lip extending radially closer to the swaging axis than any other part of the fourth swage boss, the fourth inner lip defining a fourth inner lip thickness measured parallel to the swaging axis; andwherein the third inner lip thickness increases more greatly with increasing radial distance from the swaging axis than does the fourth inner lip thickness. 21. The disk drive of claim 20 wherein an increase of the first inner lip thickness with increasing radial distance from the swaging axis defines a first taper angle,an increase of the second inner lip thickness with increasing radial distance from the swaging axis defines a second taper angle,an increase of the third inner lip thickness with increasing radial distance from the swaging axis defines a third taper angle,an increase of the fourth inner lip thickness with increasing radial distance from the swaging axis defines a fourth taper angle, andwherein the first taper angle is greater than the second taper angle by at least 4 degrees, andwherein the third taper angle substantially equals the first taper angle, and the fourth taper angle substantially equals the second taper angle. 22. The HSA of claim 20 wherein the fourth inner lip thickness at an extent of the fourth inner lip that is closest to the swaging axis is at least 30 microns greater than the third inner lip thickness at an extent of the third inner lip that is closest to the swaging axis. 23. The HSA of claim 20 wherein the first swage boss protrudes from a first swage mount of the first suspension assembly, the first swage mount including a first flat face that faces the first actuator arm tip, andthe second swage boss protrudes from a second swage mount of the second suspension assembly, the second swage mount including a second flat face that faces the first actuator arm tip, andthe third swage mount including a third flat face that faces the second actuator arm tip, andthe fourth swage boss protrudes from a fourth swage mount of the fourth suspension assembly, the fourth swage mount including a fourth flat face that faces the second actuator arm tip, andthe first swage boss defines a first swage boss radial thickness measured along a first radius that extends from the swaging axis and is tangent to the first flat face, andthe second swage boss defines a second swage boss radial thickness measured along a second radius that extends from the swaging axis and is tangent to the second flat face, andthe third swage boss defines a third swage boss radial thickness measured along a third radius that extends from the swaging axis and is tangent to the third flat face, andthe fourth swage boss defines a fourth swage boss radial thickness measured along a fourth radius that extends from the swaging axis and is tangent to the fourth flat face, andthe first swage boss radial thickness is at least 50 microns greater than the second swage boss radial thickness, andthe third swage boss radial thickness substantially equals the first swage boss radial thickness, andthe fourth swage boss radial thickness substantially equals the second swage boss radial thickness. 24. The HSA of claim 23 wherein the first, second, third, and fourth flat faces are substantially parallel to each other, and wherein the second flat face faces the third flat face, and wherein the first flat face faces away from the second flat face, and wherein the fourth flat face faces away from the third flat face.