Hermann J Stadtfeld

US Patent:

6390893, May 21, 2002

Filed:

Nov 22, 1999

Appl. No.:

09/444682

Inventors:

Hermann J. Stadtfeld - Rochester NY
Uwe Gaiser - Avon NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B24B 100

US Classification:

451 47, 451 28, 451161, 451219

Abstract:

A method of machining at least one tooth flank of a gear with a finishing tool. The method comprises rotating the finishing tool, such as a grinding tool, and bringing the tool and the tooth flank into contact. Relative movement between the tool and the gear is provided to traverse the tool across the tooth flank along a path whereby the path produces a tooth flank geometry of a form which, when brought into mesh with a mating tooth flank to form a tooth pair under no load or light load, provides a motion graph curve that intersects, at least two times, a motion graph curve of at least one of an immediately preceding tooth pair and an immediately following tooth pair. The motion graph curve of the tooth pair describes contact between respective tooth flanks of said tooth pair from an initial entrance into mesh to a final exit from mesh as being over a gear rotation amount of greater than 1. 0 pitch and preferably, about 1. 5 pitch to about 3. 0 pitch.

US Patent:

5839943, Nov 24, 1998

Filed:

Aug 16, 1996

Appl. No.:

8/698834

Inventors:

Hermann J. Stadtfeld - Rochester NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B24B 306

US Classification:

451 8

Abstract:

A method of truing cutting tools of the type comprising a plurality of stick-type cutting blades releasably secured in a cutter head, the cutting blades having a cutting edge and a cutting side relief surface oriented at a predetermined relief angle. The method comprises mounting a cutting tool to the spindle of a truing apparatus having a cutting tool spindle and a measuring probe with the probe capable of being moved along a first direction defining probe offset travel and along a second direction defining in/out feed motion of the probe. The cutting side relief surface of the cutting blade is positioned with respect to the probe whereby the cutting side relief surface is substantially parallel to the direction of probe offset travel. The cutting side surface of the cutting blade is probed and the position reading is recorded. The recorded position is compared with a predetermined position, and (a) if the recorded position is within a pre-set tolerance range of the predetermined position, the cutting tool is indexed to another cutting blade, or, (b) if the recorded position is outside of a pre-set tolerance range of the predetermined position, the position of the cutting blade in said cutter head is axially adjusted by an amount to reposition the cutting side within the pre-set tolerance range.

US Patent:

6217421, Apr 17, 2001

Filed:

Jan 6, 2000

Appl. No.:

9/478830

Inventors:

William D. McGlasson - Caledonia NY
Hermann J. Stadtfeld - Rochester NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B24B 100

US Classification:

451 47

Abstract:

A machine (20) for lapping or testing gears comprising a single machine column (22) having a first side (24) oriented perpendicular to a second side (26) with the first side having a first workpiece spindle (28) rotatable about a first axis and the second side having a second workpiece spindle (38) rotatable about a second axis. The first workpiece spindle is movably secured to the first side and the second workpiece spindle is movably secured to the second side. The first and second workpiece spindles are movable with respect to one another along one or more of mutually perpendicular directions G, H and V. At least one, and preferably both, of the spindles are direct drive spindles. At any relative position of the spindles and their associated gear members (36, 48) along the G, H and V directions, the crossing points of their respective axes remains the same. For lapping, the machine further includes means (64, 66) to introduce lapping compound at the toe end of one of the members rotating in mesh at a location before the point of mesh.

US Patent:

6217409, Apr 17, 2001

Filed:

Mar 15, 1999

Appl. No.:

9/267733

Inventors:

Hermann J. Stadtfeld - Rochester NY
Eric G. Mundt - Rochester NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B24B 4900

US Classification:

451 5

Abstract:

A method of dressing a threaded grinding wheel such that twisting of workpiece tooth flanks does not occur during grinding. The grinding wheel is preferably dressed with a circular arc hollow-crowned generating front with the generating front being described by a radius, R. sub. b, and dressed into an axial plane of the grinding wheel. The workpiece is then relatively shifted across the grinding wheel along a feed shift vector which is oriented perpendicular to the axis of the workpiece. With this method, the effects of flank twist can be eliminated, or, a controlled amount of flank twist can be introduced not only in helical gears, but also in spur gears. The grinding wheel may also be dressed with a circular arc barrel-shaped generating front. The principles of the present invention may also be applied to hobbing tools.

US Patent:

5800103, Sep 1, 1998

Filed:

Feb 12, 1997

Appl. No.:

8/798083

Inventors:

Hermann J. Stadtfeld - Rochester NY
William D. McGlasson - Caledonia NY
Kent D. Yunker - Rochester NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B23F 910

US Classification:

409 27

Abstract:

A method of machining one or more tooth slots in a bevel gear-shaped workpiece with a cup-shaped tool having one or more stock removing surfaces. The method comprises indexing the workpiece by rotation about a workpiece axis to bring one of the tooth slots to a final machining position. Simultaneously with at least a portion of the indexing, positioning the tool to contact the workpiece to commence machining the slot and infeeding the tool during the indexing while moving the tool with the indexing workpiece to maintain the tool positioned in the slot. The infeeding, movement of the tool, and indexing continuing at least until the final machining position is achieved.

US Patent:

5716174, Feb 10, 1998

Filed:

Aug 29, 1996

Appl. No.:

8/705475

Inventors:

Hermann J. Stadtfeld - Rochester NY
James S. Gleason - Rochester NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B23F 914

US Classification:

409 26

Abstract:

A method of feeding a tool to a predetermined depth in a workpiece in a machining process for producing at least one tooth surface on the workpiece. The workpiece being rotatable about a work axis and the tool being rotatable about a tool axis and includes at least one stock removing surface, The method comprises rotating the tool about the tool axis and contacting the rotating tool and the workpiece. The tool is fed relative to the workpiece along a feedpath to the predetermined depth wherein at least a portion of the feedpath is defined by a feed vector comprising at least first and second feed vector components. The first and second feed vector components are positioned in a plane defined by the work axis and the direction of the tool axis with the first feed vector component being substantially in the direction of the tool axis and the second feed vector component being substantially in the direction of the face width of the workpiece.

US Patent:

5895180, Apr 20, 1999

Filed:

Sep 5, 1997

Appl. No.:

8/924682

Inventors:

Hermann J. Stadtfeld - Rochester NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B23F 914
B26D 112

US Classification:

409 13

Abstract:

A method for determining front-face indexing errors of like cutting blades mounted in a face hobbing cutter head. The cutter head is rotatable about a cutter axis and the like cutting blades (e. g. inside cutting blades or outside cutting blades) each having a cutting edge and are arranged in a plurality of blade groups in the cutter head. The method comprises determining the angular position of the front face of one or more of the like cutting blades about to the cutter axis by rotating the cutting edge of one or more of the like cutting blades relative to an angular detecting means, such as a non-contacting probe. The measured front face angular positions are compared with respective theoretical front face angular positions and an angular difference,. DELTA. phi. sub. c, is calculated. A cutting blade front face index error, F. sub.

US Patent:

5890846, Apr 6, 1999

Filed:

Mar 24, 1997

Appl. No.:

8/823098

Inventors:

Raymond E. Clark - Mt. Morris NY
Hermann J. Stadtfeld - Rochester NY
Lyndon D. Stickles - Rochester NY

Assignee:

The Gleason Works - Rochester NY

International Classification:

B26D 112

US Classification:

407 21

Abstract:

A cutter head including a cutter body portion having a first outer surface and a second outer surface located inward of the first outer surface. Both first and second outer surfaces are interrupted by a plurality of blade receiving slots which extend inward into the cutter body portion. The first and second outer surfaces are arranged such that an annular projection is formed protruding from the second outer surface and extending to the first outer surface. The annular projection is also interrupted by the plurality of cutting blade slots thus forming a plurality of individual projections. The cutter head additionally includes a clamping ring extending about the cutter body and secured to the annular projection. The clamping ring comprises first and second ring members which together define an inner receiving channel having a form complementary with the form of the annular projection whereby securing the first and second ring members together about the annular projection positions the annular projection in the receiving channel and secures the clamping ring to the cutter body. The cutter head may include a generally concave shaped clamping block which is attached to the receiving channel in the clamping ring.