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5-axis technology

A measurement revolution

Unlike conventional CMM measurement methods, Renishaw's 5-axis technology uses synchronised motion of CMM and head axes to minimise the machine's dynamic errors at ultra-high measuring speeds.

What is 5-axis measurement?

Based on advanced head, sensor and control technology, Renishaw's 5-axis measurement technology delivers unprecedented measuring speed and flexibility, whilst avoiding the speed versus accuracy compromises inherent to conventional techniques. It boosts measurement throughput, minimises lead times and gives manufacturers a more comprehensive appreciation of the quality of their products.

Unlike systems based around indexing heads or fixed probes, 5-axis motion enables the stylus to follow a continuous path around complex components without having to leave the surface to change stylus cluster or index the head. Controller algorithms that synchronise CMM and head motion produce an optimal tip path and minimise CMM dynamic errors.

5-axis measurement technology emblem

5-axis measurement technology explained

In conventional measurement methods the CMM performs all the movements necessary to acquire the surface data. Acceleration induces inertial deflections in the machine structure, which in turn induce measurement errors.

Metrology system manufacturers have devoted years to develop techniques that reduce those dynamic errors, but there is an upper speed limit imposed by the machine and servo system stiffness, beyond which measurement cannot be taken with reliability.

5-axis measurement technology breaks through that limit by using an articulating head that moves in two rotary axes as it measures. This allows the CMM to do what it is best designed to do - move at constant velocity in a single vector while measuring. As the head is much lighter and more dynamic than the CMM, with a significantly better bandwidth, it is able to quickly follow changes in the part geometry without introducing harmful dynamic errors, which results in much faster surface speeds and hence shorter measurement cycles.

5-axis vesus 3-axis measurement throughput studies

Scanning - aero engine blisk

922% improvement in throughput

REVO inspecting blisk

Bladed discs (known as ‘blisks') present extreme access challenges and conventionally require numerous head indexes.

Renishaw's 5-axis measurement dramatically reduces cycle times through continuous scanning of blade sections, blade surfaces and root profiles.

Aero engine blisk throughput study graphThe measurements

  • 9 sectional scans, 8 longitudinal scans and 2 root profile scans per blade
  • 1 scan of annulus profile

Before

  • 3-axis scanning at 10 mm/sec measurement time;
    1 blade = 46 min, all 29 blades = 22 hours 11 min

After

  • REVO at 200 mm/sec measurement time; 1 blade = 4 min 30 sec, all 29 blades = 2 hours 10.5 min

922% throughput increase

Scanning - cylinder head

690% improvement in throughput

REVO measuring cylinder head

Valve seat and guide measurement is one of the toughest measurement tasks in an automotive cylinder block. Using a helical scan, the REVO head gathers thousands of data points from which the height, diameter, seat width and form can be determined.

Cylinder head throughput study graphThe measurements

  • 12 valve seats
  • 12 valve guides

Before

  • 3-axis scanning at 15 mm/sec measurement time
    = 29 min 13 sec

After

  • REVO at 400 mm/sec and 50 mm/sec measurement time = 3 min 42 sec

690% throughput increase

Touch-trigger - valve block measurement comparison PH20 versus traditional motorised indexing head

300% improvement in throughput

PH20 with part
We measured a valve block with a traditional motorised indexing head. We fitted a PH20 to the same CMM and measured the same features, with the same number of points on the same part. The CMM speed and acceleration settings were kept the same.

The measurements

  • 8 bores measured

Before

  • 3-axis motorised indexing head, measurement time = 1 min 52 sec

After

  • With the PH20 5-axis touch trigger probe head, measurement time = 37 seconds

300% throughput increase for measurement process

Calibration

  • Before: 1 tip, 8 positions 4 minutes
  • 1 tip, inferred calibration for all positions, 2 min 30 seconds

37.5% throughput increase for calibration process

5-axis measurement systems