# US 9,751,185 B2 · Assembly having a handheld power tool and a roughing disk > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,185 B2 - Document ID: US9751185B2 - Status: Granted - Kind: B2 - Application number: 14/908,545 - Filed: 2014-08-04 - Published: 2016-06-23 - Granted: 2017-09-05 - Earliest claimed: 2013-08-02 - Assignees: Rhodius Schleifwerkzeuge GmbH & Co. KG - Applicants: Rhodius Schleifwerkzeuge GmbH & Co. KG - Inventors: Mike C. Wolf; Gerald Lichter - Web page: https://patentgrep.com/patent/US9751185B2 ## CPC - B24B 23/02: with rotating grinding tools; Accessories therefor - B23Q 17/0952: {during machining} - B23Q 17/0961: {by measuring power, current or torque of a motor} - B24B 23/005: {Auxiliary devices used in connection with portable grinding machines, e.g. holders} - B24B 23/028: {Angle tools} - B24B 49/16: taking regard of the load - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT ## Abstract An assembly includes a handheld power tool. The handheld power tool comprises a housing, a drive shaft mounted at the housing via a bearing, a drive unit to drive the drive shaft, handles which are fixedly attached to the housing, a fastening device to fasten a roughing disk to the drive shaft, a first sensor to measure a power consumption value or an acceleration sensor to measure positional change information, an evaluating unit to evaluate the power consumption value sensed or the positional change information produced so as to produce an evaluation result, and an outputting device to output the evaluation result. ## Claims ### Claim 1 An assembly comprising: a handheld power tool comprising: a housing, a drive shaft mounted at the housing via a bearing, a drive unit configured to drive the drive shaft, handles which are fixedly attached to the housing, and a fastening device configured to fasten a roughing disk to the drive shaft; a first sensor configured to measure a power consumption value or an acceleration sensor configured to measure positional change information; an evaluating unit configured to evaluate the power consumption value sensed or the positional change information produced so as to produce an evaluation result; and an outputting device configured to output the evaluation result. ### Claim 2 (depends on 1) The assembly as recited in claim 1, further comprising: a second sensor configured to measure mechanical loading values which act on the bearing of the drive shaft; wherein, the evaluating unit is further configured to evaluate the mechanical loading values measured. ### Claim 3 (depends on 1) The assembly as recited in claim 1, further comprising a display attached to the handheld power tool. ### Claim 4 (depends on 1) The assembly as recited in claim 1, wherein the assembly further comprises: a data processing assembly arranged remote from the handheld power tool; and a data connection, wherein, the data processing assembly is connected to the handheld power tool at least temporarily via the data connection. ### Claim 5 (depends on 4) The assembly as recited in claim 4, wherein the outputting device is arranged on the data processing assembly. ### Claim 6 (depends on 5) The assembly as recited in claim 5, wherein the acceleration sensor is attached to the housing. ### Claim 7 (depends on 6) A method for operating the assembly as recited in claim 6, the method comprising: measuring the power consumption value with the first sensor; evaluating the power consumption value with the evaluation unit so as to obtain the evaluation result; and outputting the evaluation result via the outputting device. ### Claim 8 (depends on 7) The method as recited in claim 7, further comprising: measuring the mechanical loading values acting on the bearing of the drive shaft with the second sensor; and factoring in the mechanical loading values with the evaluating unit when producing the evaluation result. ### Claim 9 (depends on 8) The method as recited in claim 8, further comprising: measuring positional change information with the acceleration sensor; and evaluating the positional change information with the evaluating unit when producing the evaluation result. ### Claim 10 (depends on 9) The method as recited in claim 9, wherein the evaluation result further comprises corrective information for an operator, the method further comprising, using the corrective information by the operator to correct an alignment of the handheld power tool. ### Claim 11 (depends on 10) The method as recited in claim 10, further comprising checking the correction of the alignment based on the positional change information of the acceleration sensor. ### Claim 12 (depends on 9) The method as recited in claim 9, wherein the evaluation result further comprises efficiency information on a work process. ### Claim 13 (depends on 7) The method as recited in claim 7, wherein, the handheld power tool further comprises a mounted roughing disk; and a third sensor is arranged either in the handheld power tool or in the assembly, the third sensor being configured to detect a type of the mounted roughing disk, the method further comprising: detecting the mounted roughing disk with the third sensor, and at least one of, selecting an operating mode of the handheld power tool based on the type of roughing disk detected by the third sensor, setting an operating mode of the handheld power tool based on the type of roughing disk detected by the third sensor, and reviewing an operating mode of the handheld power tool chosen by the operator. ### Claim 14 (depends on 13) The method as recited in claim 13, wherein, the assembly further comprises a data memory, the data memory being configured to store roughing disk parameters relating to individual roughing disks, the method further comprising, using the roughing disk parameters stored in the data memory of the assembly during the evaluating. ### Claim 15 (depends on 14) The method as recited in claim 14, further comprising updating the roughing disk parameters stored in the data memory of the assembly. ### Claim 16 (depends on 1) A method of using an acceleration sensor to monitor vibrations and/or oscillating movements when using the handheld power tool as recited in claim 1, the method comprising: providing the assembly comprising the handheld power tool as recited in claim 1; providing an acceleration sensor configured to produce positional change information fastened to an arm of the operator and/or arranged in the assembly of the handheld power tool; using the acceleration sensor to monitor the vibrations and/or the oscillating movements when using the handheld power tool with the roughing disk during a rough machining of a workpiece; and communicating corrective information for an improved machining to an operator via the outputting device based on the positional change information produced by the acceleration sensor. ### Claim 17 (depends on 16) The method of using as recited in claim 16, wherein the acceleration sensor fastened to the arm of the operator is integrated into an armband.