www.lammb.cz - Laser Adjustment & Measurement of Machine Bases


10th February 2010
Renishaw company grants new Bluetooth wireless Ballbar QC20 to LAMMB systems s.r.o. for testing in operating conditions by its customers. Our company keeps at disposal another the most modern equipment for diagnostic and measurement of CNC tool machines and for preparing of case study for company Renishaw.
13th November 2009
Our company succesfully restored certificate authenticity ISO 9001 : 2008 for all activity related with diagnostic of CNC tool machines, service and machine repairs.
17th April 2007
We offer calibration of rotary axes by the Renishaw RX 10 system, which in connection with the Renishaw ML10 interferometer enables calibration of any swivelling angle of the rotary axis. The calibration can be carried out in automatic cycle – similar to measurement of position precision. The RX 10 table automatically monitors the axis motion and – by slight turning in the opposite direction – keeps the permanent measuring position of the measuring optical devices. Precision of ± 1 angle second is reached at measurement of rotary axes.

Measurement of geometry, adjustment (setting-up) and repairs of machine tools and production machines

Check of precision geometry of production machines and their setting-up

Quality of products is more and more important. It has become one of the most discussed and solved problems. Continuous acceleration is a characteristic feature of the current technical development. It is determined by continuous differentiation of customer needs. On the other hand, the production is going up and, at the same time, the requirements for quality of products and precision of machines are increased as well.

In the past the selling price used to be the chief factor but now the quality of products is more and more crucial. Increasing quality costs are obvious as well. They include cost of defective work or their possible repairs, customer claims, cost of testing and inspection.

There is a task for machine users. They need to gather evidence for verification and document the precision of machinery, to minimize cost due to low quality production and machine breakdowns, to classify machines according to valid standards and follow the trends in precision development.

The importance of systematic measurements is increasing, however it is not always fully appreciated. It often comes into existence not earlier than at the moment when production fails and defects occur. However, the troubleshooting is usually much more expensive than a perfect check-up.

We offer a full and independent inspection of the machine precision at regular or irregular preventive downtimes, at takeover of new or possibly refurbished machines. We carry out fast and exact evaluation of precision of the machinery according to the ISO 230-1, ISO 230-4 and ASME B5.57 methodologies. We offer monitoring of the state of machines in operation, shortening and exact determination of causes of the machine defect, maximum elimination of errors depending on production and monitoring of the trends as well.

We partially offer:

  1. Fast diagnostics of machine tools precision using the measuring system QC-10
  2. Laser measurement of geometric precision of machines

1. Fast diagnostics of machine tools precision using the QC-10

Precision of parts machined on NC and CNC machines depends crucially on the machine precision. This statement results in significant consequences both for the manufacturers and users of CNC machines. The manufacturers are led by customer requirements to production of precise machines which would be fully able to keep the guaranteed parameters in the long-term period. At the same time they have to be able to prove these parameters in compliance with the internationally recognised standards. They solve problems in the field of workpiece inspection, rejects / defectives, idle times, decreased productivity, and long-term low quality.

Diagnostics options

  • Analysis of circularity according to ISO 230-4
  • Non-circularity according to ASME B 5.57

Furthermore, we carry out analysis of circularity deviations and quantify the proportion of possible individual causes to the total deviation. The final result of diagnostics is then given by the percentage – or possibly by the absolute value – of influence of individual errors to the total precision error. All these results can be reliably documented by printouts given at the measurement protocol which includes attachments mentioned below:

  • diagnostics chart with percentage scores of individual parts
  • diagnostics chart with absolute scores of individual parts in µm

Using the diagnostics measurement not influencing the course of production it is possible to find out effect of the actual servo delay, dead movement error in detected axes, servo adjustment error, cross clearance error, cyclic error, perpendicularity error, straightness error, measurement adjustment error and total state of adjustment of drives of all axes. The machine can be tested in all planes. Monitoring of the machine precision development trend and repeatability diagnostics are secured by diagnostics blocks:

  • trend analysis
  • maximum repeatability
  • statistical repeatability

It is possible to create archive out of the measurements carried out and to obtain continual view of the development of the machine parameters, which is another advantage of this system. Using this type of diagnostics it is possible to monitor the precision development trends of NC and CNC machines. It is possible to determine the machine which is able to fulfil the precision requirements of the given type of parts.

Using this classification and its periodical recurrence it is possible to reduce the cost of rejects / defectives due to incorrect matching of products to machines. In addition, the cost originated in the machine removal can be reduced, as it possible to determine the need of repair before any serious breakdown might occur. The repair is less expensive and, in addition, the time of the necessary machine downtime is minimized.

2. Laser measurement of geometric precision of machines

Precision of parts manufactured on a given machine depends on mutual relative motions between a tool and a workpiece in the course of technological process.

We carry out inspection of a shape and mutual position according to the ČSN 20 0300 (General conditions for measurement of geometric precision of machine tools and shaping machines).

  • Straightness measurements
  • Angle measurements
  • Planeness (flatness) measurements
  • Perpendicularity measurements
  • Measurements of position of rotary tables, rotary axes
  • Dynamic measurements
  • Positioning precision measurements
  • Linear and non-linear compensation of measuring and straightness errors

Based on the ISO 230-2 we create or renew non-linear compensation of errors of positioning, motion straightness or droop errors caused by its own weight using a laser interferometer. Geometric precision of the machine is measured on the machine which is not loaded by a workpiece. The measurement results and corrections carried out are documented in protocols.

Diagnostics options

The measurement is carried out by the ML-10 laser measuring system of Renishaw company, which represents the top tools for diagnostics of the machine tools and co-ordinate measuring machines. Its precision of 0.7 ppm provides the results of measurement documented according to international standards that cannot be offered by any other system.