Laser System for on-line diameter control of bars and tubes.

Barline Laser Measuring Systems are particularly suitable for the diameter control of ground bars or drawn metallic tubes.
Thanks to a perfect balance between straightforward operation, reliability and advanced performance, Barline Systems represent today’s ideal solution for process automation and quality control.
The Barline.XY Laser System has been specially designed for on-line gauging of the outside diameter of products manufactured in cut lengths, such as steel ground bars, steel drawn tubes, copper tubing, etc.

The main functions of the system are as follows:
• Through-feed measurement and display of the external diameter
• Tolerance checking and output alarms for part sorting
• Real-time grinder regulation
• Processing and printing of statistical reports
• Interface with remote computer


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    Single Axis     Dual Axis    
  X40/A X80/A X150/A XY 13/A XY 13/A/HF XY 35/A XY 35/A/HF
Type of gauge XLS40/1500/A XLS80/1500/A XLS150D/150/A XLS13XY/480/A XLS13XY/1500/A XLS35XY/480/A XLS35XY/1500/A
Measuring Field (mm) 40 80 150 13 x 13 13 x 13 35 x 35 35 x 35
Measurable Diameters (mm) 0.1 - 38 0.75 - 78 0.8 - 149 0.1 - 10 0.1 - 10 0.2 - 32 0.2 - 32
Resolution (selectable) (μm) 10 / 1 / 0.1 / 0.01 10 / 1 / 0.1 / 0.01 10 / 1 / 0.1 / 0.01 10 / 1 / 0.1 / 0.01 10 / 1 / 0.1 / 0.01 10 / 1 / 0.1 / 0.01 10 / 1 / 0.1 / 0.01
Linearity (centred product) (μm) ± 0.5 ± 1 ± 3 ±0.5 ±0.5 ±1 ±1
Linearity (in the measuring plane) (μm) ± 0.5 ± 2 ± 4 ±1.5 ±1.5 ±2.5 ±2.5
Repeatability (T=1s, ±2σ) (μm) ± 0.07 ± 0.2 ± 0.4 ±0.15 ±0.04 ±0.3 ±0.15
Single Shot Repeatability (±2σ) (μm) ± 1.5 ± 3.5 ± 5 ±1 ±0.75 ±3.5 ±2.5
Beam Spot Size (s,l) (mm) 0.08 x 2 0.4 x 3.5 0.5 x 4 0.1 x 4 0.1 x 4 0.2 x 4 0.2 x 4
Scanning Frequency (Hz) 1500 1500 1500 480 (X) x 480 (Y) 1500 (X) x 1500 (Y) 480 (X) x 480 (Y) 1500 (X) x 1500 (Y)
Scanning Speed (m/s) 300 588 940 156 163 288 300
Dimensions (mm) 500 x 134 x 68.5 790 x 170 x 60 1100 x 282.5 x 140 204 x 137 x 49 292 x 137 x 49 352.5 x 258.2 x 72 352.5 x 258.2 x 72
Weight (kg) 4.2 7 15 2 2.5 5.8 5.8

VLD (Visible Laser Diode); λ = 650nm

  • No customer rejects or later complaints:  the continuous online inspection allows detection and sorting of any out-of-tolerance parts
  • Reduction of scrap and material savings: the real-time process control keeps the product within the tolerance range
  • Labour savings: the operator’s task is made lighter by the unsupervised grinder regulation
  • Quality certification made easier: the 100% inspection makes random sample checks redundant and allows the printing of detailed reports to prove product quality and process capability
  • Insensitive to bar vibration and movement: the non-contact laser operating principle enables through-feed inspection, without having to stop or slow down the product
  • The oil doesn’t affect the gauging accuracy: due to the compact size of the gauges and specially developed accessories, it is possible in most cases to install the sensor just after the grinding wheels and before the oiling device, in such a position the bar can be easily cleaned by blowing away the coolant
  • High precision: the system is fitted with a patented self-calibration device which guarantees permanent gauge accuracy with no re-mastering required
  • Straight forward operation: guided menus ensure maximum ease of usage, even for untrained staff
  • Competitive price: the favourable cost/benefits ratio ensures a short payback time
  • Reliability and long life: the high standards of components and the solid state laser source warrant long operational life



The Barline.XY System is based on an Xactum Laser Gauge, installed at the output of the grinder or drawing bench, which measures very accurately the outside diameter of the product passing through the laser beam. The non-contact operating principle enables through-feed inspection, without having to stop or slow down the product, as its vibration and movement do not affect the gauging accuracy.
The measured average diameter is continuously compared with the nominal value pre-set by the operator: if the product size is going out of the pre-set limits, the Barline.X software automatically adjusts the grinder, recovering the wheel wearing so as to keep the product always within the desired tolerance limits. After skipping the head and the tail, all the readings taken along the bar are stored in memory and compared to the pre-programmed tolerance limits.
By connecting a printer to the control panel, it is possible to get a print-out listing the max, min and average values measured on each part; in addition this data can be recorded and processed to print a final statistical report related to each selected bundle of bars. Through an Ethernet or RS232 serial line, a remote computer can be used to download the measured data or to programme the system.


The basic package includes the following functions:

  • Display of the measured diameter, of its shift from the set point and of the ovality (*)
  • 3 measured values can be simultaneously displayed on the screen
  • Programmable skipping of head and tail scans
  • Recording of measurements taken along the bar and printing of the values of max, min, avg diameter and ovality (*)
  • Programming of nominal value and tolerances
  • Real-time and delayed (end of bar) out-of tolerance alarms (Go/NoGo)
  • Part sorting signals (Rework/Reject)
  • Automatic compensation for product thermal expansion, by programming the temperature and the expansion coefficient
  • Library of parameters for 1000 different products, directly retrievable by the operator
  • Possibility of entering a password to restrict the programming functions to authorised personnel
  • Ethernet / Rs232 interface for remote programming or data retrieval
  • Multi-lingual menus (Italian, English, French and German)
  • Selectable measuring unit (mm or inches) and resolution
  • Pre-programmed factory set-up to facilitate installation and start-up of the system.

The additional Process Regulation module (Option 1) features the following functions:

  • Software for automatic diameter regulation, by adjusting the distance between the grinding wheels
  • PI (Proportional-Integral) mode, using INC (+) o DEC (-) pulse trains, whose number is proportional to the amount of the required correction
  • Regulation is started after having positively checked a real trend to drift from the nominal set-point
  • Control parameters can be programmed and stored in the product library
  • Automatic backlash recovery, by adding extra pulses each time the correction is reversed
  • Separate averaging time for feed-back: it may be set longer than the averaging time for tolerance checking, usually programmed to be as low as possible to detect even shortest diameter flaws

The additional Statistics module (Option 2) offers the following functions:

  • Processing and printing of a report for each batch of bars (bundle)
  • The max, min, avg, Cp and Cpk values for each parameter recorder on the bar (max, min, avg diameter and ovality) are computed and printed
  • The bundle can be selected manually by the operator or determined automatically via a Start/Stop input signal
  • Identification of the order and of the operator, with automatic progressive numbering of the bundle
  • Statistics can include all the bars of the bundle, or it can be restricted to the good or rejected bars only
  • All reports show the date and time
For further information or enquiries Give us a call or fill in our online enquiry form
+44 (0)1823 333343