SMAC Moving Coil Actuators SMAC Moving Coil Actuators
Moving Coil Actuators
The ability to do work and verify its accuracy at the same time.
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SMAC Electric Actuators | Other Applications - Electric Cylinder Actuator, Linear, Linear Rotary, Gripper, XY Stage

Other Applications

The unique features of SMAC actuators make them ideal for many highly-specialized applications. Repeatable control force and speed, along with 100% data feedback and the ability to "Soft-Land" allow SMAC electric actuators to perform tasks that other automation devices are unable to handle. High speed inspection and testing of delicate or oddly-shaped materials and parts is easy with SMAC actuators.

Contact lens mold checking

Contact Inspection of Soft Contact Lens Mold

Each prescription for a soft contact lens is embodied in a single plastic mold. The mold costs less than one dollar but by the time a lens is made, several dollars may have been expended, so it's prudent to check the mold for the correct measurement before it is used to make a lens. The critical dimension is the distance from the plane of the parting line to the spherical surface of the lens. Since the parting line is very sharp and the mold material is quite soft, it is necessary to make that measurement with a controlled light touch.

Work Profile

The SMAC actuator is equipped with a tip which is the same diameter as the parting line plane. The actuator rod can be driven through a hole in the center of the tip. A second actuator with a spherical seat on its tip is used to contain and raise the mold up against the tip of the first actuator. The force used to seat the mold against the tip is set at 30 grams. With the mold in place, the rod from the first actuator is driven towards the spherical surface of the mold and lands softly on the mold, making the measurement.

Key Operational Details

  • Bottom actuator lifts up, lands softly (30 grams) on the measuring tip
  • Top actuator extends, lands softly on contact lens mold
  • Measurement is taken
  • Pass/fail status is signaled

SMAC Advantages

  • 100% parts inspection
  • Linear actuator in a single ready-to-mount package
  • Reproducible force setting to get consistent measurement

Contact Inspection of Rod Eccentricity

Rods destined for use in automobiles are machined, heat-treated and inspected for eccentricity of four diameters. Four SMAC actuators are used for the inspection as the rod is rotated. Each actuator measures the maximum and minimum travel and compares it with the stored Go/No-Go values. A pass/fail indicator reports the status of the part to the operator.

Key Operational Details

  • High speed approach, slow down, land softly on rod surface
  • Set force to 100 grams, monitor position as rod is rotated
  • Register minimum and maximum positions and calculate eccentricity
  • Measurement is compared against Go/No-Go window
  • Pass/fail signal is triggered

SMAC Advantages

  • 100% inspection
  • Programmable force profile
  • High speed, long life design for continuous operation
  • QA reporting function
  • Linear actuator in a single ready to mount package

Material Testing

A medical device manufacturer needed to test a heart valve material for long term fatigue. They wanted to duplicate the heart beat profile to simulate actual conditions. Because SMAC actuators can be programmed to develop the heart beat motion profile, they were a perfect choice for the application. By measuring the force used to stretch the material to the prescribed length, the gradual degradation of the material could be continuously monitored.

Key Operational Details

  • Each finger is driven by an independent linear actuator
  • Each finger is programmable in position and force

SMAC Advantages

  • Independently operated fingers means that parts need not be precisely centered
  • Complicated motion profiles can be generated to accurately simulate heartbeats
  • Force can be monitored, so as the material degrades the resulting change in force as the material is exercised can be used to indicate a failure mode without stopping the test

Similar Applications

  • Creep tests for material under temperature and time parameters
  • Human motion simulation for carpal tunnel checks

Latch Inspection

The force used to compress a spring to close the latch is checked using an SMAC LAL90 actuator.

Key Operational Details

  • High speed approach, slow down, land softly on part, part is measured to check for correct location
  • Force is increased in steps, position and force are measured to determine proper latch operation

SMAC Advantages

  • Force can be selected in position servo mode
  • Position can be measured to one micron resolution
  • In force mode, parts can be precisely measured with a reproducible contact force
  • Force can be measured with a resolution of 20 grams
  • Measurements can be transferred to a host computer to make the calculations

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