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You are here: / Measure the Form

Measure the Form

Tolerances are very important in the manufacture of components due to their impact on functionality, and manufacturing costs. Where dimensional deviations are not within the specified tolerances, work pieces may have limited functionality or correct assembly may not be possible Manufacturing defects, cutting forces, vibrations or temperature fluctuations can all lead to deviations, meaning precise checking of the tolerances is necessary.

In practice, the actual geometry of a particular manufactured work piece does not exactly correspond to the ideal geometry that is theoretically desired by the designer. To produce practical work pieces despite these manufacturing deviations, a certain tolerance is taken into account at the design stage. By specifying Form and Positional tolerances on a technical drawings, the quality of machining, and fits of bores and shafts can be maintained The most important tolerances include:

Form tolerances

Straightness
Evenness
Roundness
Cylindricity

Alignment tolerance

Parallelism
Perpendicularity

Positional tolerance

Coaxiality

Concentric tolerance

Run out
Total run out

The tolerance is usually selected in such a way, that the production remains cost-effective, but the component can completely fulfil its tasks despite the deviations from the ideal position. However, increasingly smaller deviations from the ideal shape are required for precision components. Therefore, tolerances for dimension and shape in the sub-micrometer range up to the nanometer range must be complied with in manufacturing. Tight dimensional tolerances are necessary, to guarantee the proper functioning and reliability of the components. These increasing demands for production quality also require ever-increasing precision in production measurement technology.

All our Form measuring units are highly accurate, robust and low-maintenance. Depending on the measuring task and weight of the work piece, you can choose between the table form tester and spindle form tester. Our precision form tester can be used in the measuring room or in production.

Spindle form tester

For larger and heavier or cubic work pieces, spindle-form testers can also be used, which can measure work pieces up to 400 kg (optionally up to 1000 kg) as standard.

Drawing of an ACCRETECH spindle form tester

Advantages:

  • Suitable for heavy, large and unusually shaped objects (up to 400 kg as standard/1000 kg optional)
  • Air-bearing measuring spindle for high roundness precision
  • Short measuring times through high traverse speed
  • Extremely hard-wearing and low maintenance
  • Z settings have no effect on R settings.
  • Automatic measuring of different measuring positions by the process of the table and work pieces.
  • The granite structure and air-bearing guide enable high straightness and positioning accuracy.

Table form tester

The table form testers with air -bearing rotary table are particularly suitable for work pieces up to 250 kg.

Advantages:

  • Suitable for work pieces up to 250 kg.
  • Air-bearing rotary table for rotation of work pieces
  • Increased stiffness and long-term stability
  • Low maintenance
  • High measuring speed
  • Maximum achievable rotation accuracy
  • Z settings have no effect on the rotary table position
  • Offset detector holder avoids collision between the R axis and the work piece
  • Plain bearings or air-bearing guidance: no drive vibrations which could affect the result

The ACCRETECH product categories for spindle and table profile testers:

Link to: Fully automatic devices

CNC-controlled profile measuring systems

Link to: Automatic profile measuring instruments with manual alignment

Automatic systems, manual alignment

Link to: Devices with manual columns

Devices with manual columns

Link to: Fully automatic devices

Systems for large and heavy workpieces