US 9,808,870 B2
Apparatuses and methods for cutting a reverse spot-face in a workpiece
Walter F. Gurnavage, Goose Creek, SC (US)
Assigned to THE BOEING COMPANY, Chicago, IL (US)
Filed by The Boeing Company, Huntington Beach, CA (US)
Filed on Sep. 26, 2016, as Appl. No. 15/275,735.
Application 15/275,735 is a continuation of application No. 14/481,484, filed on Sep. 9, 2014, granted, now 9,486,861.
Prior Publication US 2017/0008095 A1, Jan. 12, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. B23B 51/10 (2006.01); B23B 51/12 (2006.01)
CPC B23B 51/102 (2013.01) [B23B 51/104 (2013.01); B23B 2215/04 (2013.01); B23B 2260/008 (2013.01); B23B 2260/12 (2013.01); Y10T 408/5621 (2015.01); Y10T 408/5622 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A reverse spot-facing tool for cutting a reverse spot-face in a workpiece using a reverse spot-facing cutter, comprising a cutting edge and configured to engage a pilot shaft having a first end and a second end, the workpiece comprising a through hole having a central axis, the reverse spot-facing tool comprising:
a stop configured to be located between the first end and the second end of the pilot shaft;
a biasing assembly that generates a first thrust force and a second thrust force equal and opposite to the first thrust force when the reverse spot-facing cutter is cutting the reverse spot face wherein the biasing assembly comprises:
a workpiece-engaging member comprising:
a third end configured to face the workpiece,
a fourth end opposite the third end and configured to face the stop,
a second through opening extending between the third end and the fourth end, wherein the second through opening has a first wall, and
a first abutment surface configured to engage the workpiece; and
a stop-engaging member comprising:
a fifth end configured to face the workpiece,
a sixth end opposite the fifth end and configured to face the stop,
a thrust bearing configured to be positioned between the biasing assembly and the stop,
a third through opening extending between the fifth end and the sixth end, wherein the third through opening has a second wall, and
a second abutment surface configured to engage the thrust bearing,
wherein the workpiece-engaging member and the stop-engaging member are configured to be adjustably interconnected; and
wherein, when the reverse spot-facing cutter is cutting the reverse spot-face, the pilot shaft is co-axial with the central axis and wherein the pilot shaft has a sliding fit with the third through opening of the stop-engaging member, the cutting edge of the spot-facing cutter is substantially perpendicular to the central axis, the thrust bearing transmits the second thrust force from the biasing assembly to the stop, and the biasing assembly transmits the first thrust force to the workpiece.