Patent Application
20080016711
In
The stylus 2 has a stem S with a first end E1 and a second end E2. The geometry of the stem (S) of the stylus 2 corresponds to a cylinder, wherein its first end E1 has a tapered cylindrical end, onto which is glued as contact element a sphere 3 which is brought into contact with the measured object during a measurement procedure.
The second end E2 of the stylus 2 has a frustum-shaped form which at its end into which the RFID chip 50 according to the invention is glued has a recess in the form of a bore.
The stylus 2 is introduced with its second end E2 into a holder 1, which has a cylindrical recess. The connection between the stem S of the stylus and the holding device 1 can be carried out by adhesive, a soldering process, a shrink fit or a press fit etc. or their combinations. The connection between the stylus 2 and the holding device or the sensor head 1 is a screwed connection.
The stylus has the following parameters in this example: the holder 1 is made of steel according to DIN 1.4305, the stem S of the stylus 2 is made of hard metal and the sphere 3 consists of ruby.
The overall length of stylus, contact element and holding device is 30.5 mm in this example.
The sphere of the contact element has a roughness of 0.02 μm.
Three measurement devices 10a, 10b and 10c are shown in
Also in
The method for taking into account data characterizing the stylus, in particular bending characteristics data of a measurement device, is to be explained by means of
The data characterizing the stylus have already been ascertained by a method for a calibrating device which has been described in detail in EP 1248073 B1 and which will not be described in more detail here.
Firstly a user of the measurement device 10 attaches a plurality of measurement devices 10a, 10b and 10c in the respective holding device 11 of the individual measurement devices 10a-10c. The styli 2 are pushed into the respective holding devices 11 of the individual measurement devices 10a-10c.
Each measurement device 10a-10c has a contact element 3 which is made from ruby and which has characteristic data (maximum diameter deviation, maximum dimensional deviation, roughness) which have already been described in
An RFID chip 50 is glued to the second end E2 of each of the styli 2 by means of a marker.
As soon as the respective styli 1 have been introduced with the respective specific RFID chips 50 into the holding devices 11 of the respective measurement devices 10a-10c, the user activates the measurement apparatus 20 by means of his computer 30.
This measurement apparatus has a send-receive unit, which creates a wireless connection between the individual RFID chips 50 of the measurement devices 10a-10c by means of radio frequency waves 70 (RFID) and which reads the bending characteristics data stored on the RFID chips 50.
The data characterizing the stylus, such as bending curves and geometric data of the styli 1 and contact elements 3 are stored on the respective RFID chips 50 of the respective individual measurement devices 10a-10c, using a measurement-evaluation program stored on the PC 30 when evaluating the measurements, in order to take account of the corresponding data characterizing the stylus when evaluating the measurement data. Diameter- and form-related deviations of the respective styli and contact elements of the measurement devices 10a-10c are stored in these data characterizing the stylus.
As soon as the measurement apparatus 20 has read the data characterizing the stylus from the respective RFID chips 50 of the measurement devices 10a-10c, these are sent to the PC 30 which takes these into account with the measurement data which it has obtained via the data connection V to the measurement devices 10a-10c. Thus if, via the data connection V, the PC has measured a measurement value of 0.5 mm in the measured object 60 and the error of the bending characteristic is +0.01 mm, the measurement-evaluation program corrects the actual value to 0.51 mm.
With the present measurement device according to the invention and the method according to the invention it is thus possible by means of the RFID chip integrated in the stylus to efficiently and simply transfer stylus and contact element-specific data of a plurality of measurement devices to a measurement apparatus connected to a PC, wherein by means of a measurement-evaluation program the PC then corrects the measured values of the measurement result taking into account the values of the bending characteristics.
| Number | Date | Country | Kind |
|---|---|---|---|
| DE102006033443.4 | Jul 2006 | DE | national |
