# US 2014/0360035 A1 · Two-way roundness device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360035 A1 - Document ID: US20140360035A1 - Status: Published application - Kind: A1 - Application number: 14/297,049 - Filed: 2014-06-05 - Published: 2014-12-11 - Earliest claimed: 2013-06-06 - Assignees: Cedarflat Precision Inc. - Applicants: Cedarflat Precision Inc. - Inventors: Darcy Thomas MONTGOMERY - Web page: https://patentgrep.com/patent/US20140360035A1 ## CPC - G01B 5/201: {for measuring roundness} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS ## Abstract A two way roundness device can be configured as a device in which a tool, such as an indicator rotates or as a device in which the part to be measured or cut rotates. This ability to alternate between these two configurations is enabled by a combination of a rotating spindle assembly and a two-axis stage that can be oriented, in use, with the two-axis stage under the spindle assembly or with the two-axis stage on top of the spindle assembly. ## Claims ### Claim 1 A two way roundness device operable in two different configurations comprising: a two-axis stage, movable in two perpendicular directions and having a first side with a planar portion sufficient to support the two-way roundness device when the first side is resting on a flat surface, the planar portion being parallel to the two directions of movement; a spindle assembly attached to the two-axis stage in the center of a second side opposite the first side, the spindle assembly being rotatable about longitudinal axis of rotation perpendicular to the two directions of movement of the two axis stage; and an arm having a tool receiving portion and being attachable to the spindle assembly, whereby, in a first configuration, the two way roundness device is operable with the spindle oriented above the first side, with the arm attached to the spindle and the spindle assembly being rotatable; and in a second configuration, the two way roundness device is operable with the first side oriented above the spindle assembly and the two-axis stage being rotatable. ### Claim 2 (depends on 1) The roundness device of claim 1, further comprising a base attachable to fixed earth on one side and attachable to the spindle assembly. ### Claim 3 (depends on 1) The roundness device of claim 1, wherein the spindle assembly comprises an attachment for receiving the arm such that one end of the arm is held at a distance from the axis of rotation. ### Claim 4 (depends on 3) The roundness device of claim 3, wherein the arm extends at an angle from the axis of rotation. ### Claim 5 (depends on 1) The roundness device of claim 1, further comprising an indicator for measuring roundness and wherein the tool receiving portion is configured to receive an indicator for measuring roundness. ### Claim 6 (depends on 1) The roundness device of claim 1, wherein the first side is attachable to a base. ### Claim 7 (depends on 1) The roundness device of claim 1, wherein the first side is attachable to fixed earth. ### Claim 8 (depends on 1) The roundness device of claim 1, further comprising a platform attachable to the first side. ### Claim 9 (depends on 1) The roundness device of claim 1, comprising components made of non-magnetic material. ### Claim 10 (depends on 1) The roundness device of claim 1, wherein the spindle assembly comprises a bearing assembly comprising rolling element bearings for causing rotation of the spindle assembly. ### Claim 11 (depends on 1) The roundness device of claim 1, wherein the spindle assembly comprises a bearing assembly comprising an air bearing for causing rotation of the spindle assembly. ### Claim 12 (depends on 11) The roundness device of claim 11, further comprising a rotary joint for supplying pressurized air to the air bearing. ### Claim 13 (depends on 1) The roundness device of claim 1, wherein the bearing assembly comprises a bearing housing and one or more bearings. ### Claim 14 (depends on 1) The roundness device of claim 1, further comprising an encoder for measuring angular movement. ### Claim 15 (depends on 1) The roundness device of claim 1, comprising a motor for turning the spindle assembly or the two-axis stage. ### Claim 16 (depends on 1) The roundness device of claim 1, further comprising: a rolling element bearing in the bearing assembly; a mechanical device to limit rotation of the spindle assembly to a predetermined angle; an indicator for measuring roundness. ### Claim 17 (depends on 1) The roundness device of claim 1, further comprising: a rolling element bearing in the bearing assembly; a mechanical counter to measure the absolute angle of rotation of the spindle assembly; and an indicator for measuring roundness. ### Claim 18 (depends on 1) The roundness device of claim 1, wherein the two-axis stage is an XY stage. ### Claim 19 (depends on 1) The roundness device of claim 1, wherein the two-axis stage is an XZ stage. ### Claim 20 (depends on 1) The roundness device of claim 1, wherein the spindle assembly comprises a bearing housing, the bearing housing also being an integral part of the two-axis stage.