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  • Users: simasa
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  1. simasa

    Position measurement, encoder, repeatability error

    Hello, I am measuring a position using linear encoders by Heidenhain. The encoders output is 1Vpp which is then interpolated (200 times) to get TTL signal (10 KHz). National instrument counter board PCI 6602 is then used to calculate the position. Matlab is used to acquire and save the position...
  2. simasa

    Position Resolution and Accuracy of a PSD

    Hello, I want to use a PSD (Position Sensitive Device) and a laser beam for the position measurement. Laser beam will be stationary and PSD will be moving (50 mm/s). PSD’s are available in different sizes (4 x 4 to 20 x 20) mm. Bigger the size of the PSD, less the resolution and accuracy. It...
  3. simasa

    Position measurement problem using encoders

    Hello, I am trying to measure the position from 2 linear encoders (XY Plance). My hardware setup is such as: 2 Encoders (Heidenhain) provide sine wave position signal (signal period 2 µm, frequency appx. 50KHz ). Signal is then digitized and interpolated (Sine wave to TTL, 200 times) using an...
  4. simasa

    Matlab code to read/write CNC code

    hello, I am looking for a Matlab code to read and write CNC code (G-Code). I will be thankful for any help simasa
  5. simasa

    Reference and measured path comparison

    Hello, I am planned to calculate the deviations in reference and measures tool path of a milling machine (for offline analysis in computer). Reference path is generated using reference CNC code and measured path is measured using sensors on TCP (tool centre point) Both paths may looks like...
  6. simasa

    output format of an encoder

    Hello I am planned make an application using an optical linear encoder (Heidenhain). Encoder (3 x sine) ---> Interpolation (3 x TTL )----> Counter board ---> Position I want to test the application in simulation before going to real. For this I want to generate the final position signal...
  7. simasa

    Error compensation in Machine tools, Software

    I am planning to implement a dynamic error compensation system for a CNC Milling Machine to improve its accuracy. Machine is controlled by Sinumeric 840 controller. The Real 3D-trajectory of the tool will be measures on line. Tasks may include: Conversion of NC-code (currently only G01)...
  8. simasa

    Matlab/Simulink, 2MHz frequency signal, real time

    hello I am using a Matlab XPc Target real time system for a measurement application. A counter board by NI will be used to take measurements of linear encoders. The board will deliver a TTL signal of 2MHz frequency, which is now to be worked in Simulink. Signal handling is Matlab could be a...
  9. simasa

    2D-Position/Vibration measurment

    Hello, I want to measure a 2D-Position of a machine part. The movement may be like a vibration. Aplitude 50-500 µm Frequency 20-60 Hz (variable, depending upon speed of the machine) There might be different ways, like using sensors (capacitive, inductive, laser based methods, laser...
  10. simasa

    How to avoid vibration effects?

    Hello, I am looking forward to install a laser based measurement system on a milling machine. The purpose of measurement system will be to measure small scale relative movements of machine components or machine bed. The measurement unit weight is about 0.8 Kg. The unit could be screw mounted...
  11. simasa

    max. possible signal frequency

    Hello, I am designing a Matlab/Simulink based real time application for measuring the machine position using linear encoders. My system will include the following components: • Linear encoders • Interface electronics (delivering 2 - 20 MHz, 5V TTL signal,) • Matlab XPC Target...
  12. simasa

    Controlling motor/need of an encored?

    I have a simple problem related to control of a dc motor I am planned to develop a system consist of a motor and a camera. the camera monitors and controls the motor output motion. The camera keeps sending a position signal to controller until motor is at desired position (and goes on). Now I...
  13. simasa

    Understanding Repeatability factor of motor

    Hello, I am searching a very high precise and compact motor. The motors that I find offers about: +/- 10 arcsec repeatability. What is true understanding this term: I cannot achieve the precision lever more than +/- 10 arcsec anyway. As it is manufacturing tolerance. OR...
  14. simasa

    High precise rotary movement/measurement

    Hello, I have a 50mm x 25mm x 4mm glass plate. It will rotate (CW and ACW) along its middle axis, about 20 times in a second, but only in a range of (+1°-1° to +20°- 20°). Very precise measurement upto 0.5 arc seconds accuracy is required. To move the plate, I may use a high precise...

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