Portable boring machine
A feed assembly, a boring head and an alignment device. The feed assembly may include a feed mechanism; an adjustment mechanism to adjust a feed rate of the feed mechanism; and a gage to indicate the feed rate. The boring head may include a body supportable on and for rotation with the bar; and a tool holder to support a tool to work on a workpiece and supported for radial movement on the body to adjust a radial position of the tool. An alignment device may include a clamp lockable in an axial position on the bar; an alignment member engageable with a bore of a workpiece; and an adjustment member between the locking clamp and the alignment member, the adjustment member and the alignment member include complementary threads, the adjustment member being rotatable about the axis to move the alignment member relative to the clamp along the axis.
1. A boring head for a boring bar assembly, the assembly including a rotatably drivable boring bar extending along an axis, the head comprising:
a body supportable on and for rotation with the bar;
a first tool holder operable to support a first tool to work on a workpiece, the first tool holder being supported for radial movement on the body to adjust a radial position of the first tool relative to the axis; and
a second tool holder operable to support a second tool to work on the workpiece, the second tool holder being supported for radial movement on the body to adjust a radial position of the second tool relative to the axis;
wherein the first tool holder and the second tool holder are radially movable along a radial adjustment axis between a radially-inward position, in which the first tool holder and the second tool holder overlap, and a radially-outward position in which the first tool holder and the second tool holder do not overlap, wherein the axis and the radial adjustment axis lie in a plane, and wherein the first tool holder includes a first portion on one side of the plane and a second portion on an opposite side of the plane.
2. The head of claim 1 , further comprising a radial adjustment screw connected between the body and the holder, the screw being rotatable to adjust the radial position of the holder relative to the body.
3. The head of claim 2 , wherein the screw includes a first radial adjustment screw, and wherein the head further comprises a second radial adjustment screw connected between the body and the second tool holder, the second radial adjustment screw being rotatable to adjust a radial position of the second tool holder relative to the body.
4. The head of claim 1 , wherein the first tool holder and the second tool holder are connected to the body to support the first tool and the second tool opposite sides of the axis.
5. The head of claim 4 , wherein, in a radially-inward position, the first tool holder and the second tool holder nest around the axis.
6. The head of claim 5 , wherein, in the radially-inward position, a projecting portion of the first tool holder nests in a recess of the second tool holder and a projecting portion of the second tool holder nests in a recess of the first tool holder.
7. The head of claim 1 , wherein the first portion defines a first slot and the second portion defines a second slot.
8. The head of claim 7 , further comprising:
a first clamp bolt received in the first slot;
a first clamp member engageable to clamp the first portion;
a second clamp bolt received in the slot of the second slot; and
a second clamp member engageable to clamp the second portion.
9. The head of claim 1 , wherein the second tool holder includes a third portion on one side of the plane and a fourth portion on an opposite side of the plane.
10. The head of claim 9 , wherein the third portion defines a third slot, and the fourth portion defines a fourth slot, and wherein the head further comprises:
a third clamp bolt received in the third slot;
a third clamp member engageable to clamp the third portion;
a fourth clamp bolt received in the slot of the fourth slot; and
a fourth clamp member engageable to clamp the fourth portion.
11. The head of claim 1 , further comprising:
a carrier selectively connected to the first tool holder in a first radial position, in which the first tool is a first radial distance from the axis, and in a second radial position, in which the first tool is a second radial distance from the axis; and
a radial adjustment screw connected between the body and the carrier, the screw being rotatable to adjust the radial position of the first tool relative to the body.
12. A boring head for a boring bar assembly, the assembly including a rotatably drivable boring bar extending along an axis, the head comprising:
a body supportable on and for rotation with the bar;
a tool holder operable to support a tool to work on a workpiece, the holder being supported for radial movement on the body to adjust a radial position of the tool relative to the axis;
a carrier selectively connected to the holder in a first radial position, in which the tool is a first radial distance from the axis, and in a second radial position, in which the tool is a second radial distance from the axis; and
a radial adjustment screw connected between the body and the carrier, the screw being rotatable to adjust the radial position of the tool relative to the body.
13. The head of claim 12 , wherein the screw defines an annular ridge captured by the carrier.
14. The head of claim 12 , wherein the holder includes a first tool holder operable to support a first tool, and wherein the head further comprises a second tool holder operable to support a second tool to work on the workpiece, the second tool holder being supported for radial movement on the body to adjust a radial position of the second tool relative to the axis.
15. The head of claim 14 , wherein the screw includes a first radial adjustment screw, and wherein the head further comprises a second radial adjustment screw connected between the body and the second tool holder, the second radial adjustment screw being rotatable to adjust a radial position of the second tool holder relative to the body.
16. The head of claim 14 , wherein the first tool holder and the second tool holder are connected to the body to support the first tool and the second tool opposite sides of the axis.
17. The head of claim 16 , wherein, in a radially-inward position, the first tool holder and the second tool holder nest around the axis.
18. The head of claim 17 , wherein, in the radially-inward position, a projecting portion of the first tool holder nests in a recess of the second tool holder and a projecting portion of the second tool holder nests in a recess of the first tool holder.
19. A boring bar assembly comprising:
a rotatably drivable boring bar extending along an axis; and
a boring head including
a body supportable on and for rotation with the bar, the body defining an opening for receiving the bar,
a first tool holder operable to support a first tool on a first radial side of the bar to work on a workpiece, the first tool holder being supported for radial movement on the body to adjust a radial position of the first tool relative to the axis, and
a second tool holder operable to support a second tool on a second radial side of the bar to work on the workpiece, the second tool holder being supported for radial movement on the body to adjust a radial position of the second tool relative to the axis;
wherein the first tool holder and the second tool holder are radially movable along a radial adjustment axis between a radially-inward nested position, in which at least a portion the first tool holder nests in the second tool holder, and a radially-outward position in which the first tool holder and the second tool holder do not nest;
wherein the axis and the radial adjustment axis lie in a plane; and
wherein the first tool holder includes a first portion on one side of the plane and a second portion on an opposite side of the plane and the second tool holder includes a third portion on the one side of the plane and a fourth portion on the opposite side of the plane, the second portion nesting in a recess in the second tool holder between the third portion and the fourth portion, the third portion nesting in a recess in the first tool holder between the first portion and the second portion.
20. The assembly of claim 19 , wherein the head further includes a radial adjustment screw connected between the body and the first tool holder, the screw being rotatable to adjust the radial position of the first tool holder relative to the body.
21. The assembly of claim 20 , wherein the screw includes a first radial adjustment screw, and wherein the head further includes a second radial adjustment screw connected between the body and the second tool holder, the second radial adjustment screw being rotatable to adjust a radial position of the second tool holder relative to the body.