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Press Fit Force | Determining Press Fit Force Assembly | FUTEK

What is Press Fit Force?

In engineering terms, a press-fit, also known as force fit or interference fit, is an assembly of two parts mounted tightly thru normal force or friction. For example, when a shaft is inserted tightly into a slightly smaller hole, with the interference holding both parts in place. The inserted part is typically 0.001 to 0.002 inches larger than the mating hole. 


Depending on the amount of interference, the parts may be assembled using a hydraulic cylinder as illustrated in this application note. To avoid damage during joining, critical components may also be cooled significantly below room temperature to shrink one of the components before fitting. Please note that electric and pneumatic press-fit assembly types can also be retrofitted using FUTEK sensors.


Today, press fit technology is widely used in the manufacturing of electronic and electromechanical components. Many parts are assembled with press fits, including bushings, bearings, pins, studs, rotors, gears, pulleys and shaft collars. The technology enables manufacturers to create highly reliable electro-mechanical interconnects without the use of solder.

According to manufacturing industry experts, provided that the components are correctly designed, press fitting is the least expensive assembly method, compared to soldering, fastening or gluing.


Why is it important to monitor press fit force?
Due to its many advantages over traditional assembly methods, press-fit operation is becoming more prevalent in manufacturing plants. However, it is becoming more challenging to inspect press fit defects, since the workpiece dimensions are shrinking and placement density is increasing.

A press fit force monitoring system is designed to catch defects accurately and reliably and perform real-time analysis to continuously improve manufacturing and achieve higher press-fit assembly productivity.

Common quality issues encountered in press force applications:


Part Issues:

  • Incorrect Orientation;
  • Over-size or Under-size parts;
  • Improper insertion;

Machine Issues:

  • Bad Alignment;
  • Wrong ram speed;
  • Loose fixtures;
  • Low Hydraulic / Pneumatic Pressure.


The solution is a press-fit force monitoring system that ensures that the press-fit assembly process is monitored properly and quality issues are caught in real-time.  The monitoring system uses force measurement to catch defects accurately and reliably and perform real-time analysis to continuously improve manufacturing and achieve higher press-fit assembly productivity. FUTEK's load cell sensors are ideal for these applications, as they output extremely accurate results through millions of assembly cycles. 


The press fit operation station can also be equipped with a displacement transducer to measure the movement of the press ram during the operation. The data captured by these two sensors, force, and displacement sensors, provides force-displacement measurement for press fit feature checks: Force vs. Time, Distance vs. Time, and Force vs. Distance.

How it Works
  1. A LCF300 Universal Pancake Load Cell is mated between a linear actuator piston and the press fit tool.

  2. As the hydraulic or electric cylinder (aka hydraulic ram) press fit the workpiece (i.e. shaft) into the press-fitted material (i.e. hole), the LCF300 measures the press fit force applied.

  3. The force measurement signal from the LCF300 is sent to the digital display (IHH500, IPM650) or any of FUTEK signal conditioners (IDA100 or USB520). The signal can also be displayed on a PC with our SENSIT force measurement software.

  4. An amplified analog signal can also be sent to the PLC controlling the hydraulic or pneumatic press, enabling the ability to act on defects and quality issues in the press fit assembly in real time.

  5. Additionally, SENSIT software can be used to log sensor output for quality control purposes.

Products in Use

LCF300: Universal Pancake Load Cell
IAA Series: Strain Gauge Analog Amplifier with Voltage Output
IPM650: Panel Mount Display
IDA100: Strain Gauge Amplifier with Digital and Analog Output

Contact Us
All FUTEK application illustrations are strictly conceptual.
Please Contact Us with questions.

What is Press Fit Force?

In engineering terms, a press-fit, also known as force fit or interference fit, is an assembly of two parts mounted tightly thru normal force or friction. For example, when a shaft is inserted tightly into a slightly smaller hole, with the interference holding both parts in place. The inserted part is typically 0.001 to 0.002 inches larger than the mating hole. 


Depending on the amount of interference, the parts may be assembled using a hydraulic cylinder as illustrated in this application note. To avoid damage during joining, critical components may also be cooled significantly below room temperature to shrink one of the components before fitting. Please note that electric and pneumatic press-fit assembly types can also be retrofitted using FUTEK sensors.


Today, press fit technology is widely used in the manufacturing of electronic and electromechanical components. Many parts are assembled with press fits, including bushings, bearings, pins, studs, rotors, gears, pulleys and shaft collars. The technology enables manufacturers to create highly reliable electro-mechanical interconnects without the use of solder.

According to manufacturing industry experts, provided that the components are correctly designed, press fitting is the least expensive assembly method, compared to soldering, fastening or gluing.


Why is it important to monitor press fit force?
Due to its many advantages over traditional assembly methods, press-fit operation is becoming more prevalent in manufacturing plants. However, it is becoming more challenging to inspect press fit defects, since the workpiece dimensions are shrinking and placement density is increasing.

A press fit force monitoring system is designed to catch defects accurately and reliably and perform real-time analysis to continuously improve manufacturing and achieve higher press-fit assembly productivity.

Common quality issues encountered in press force applications:


Part Issues:

  • Incorrect Orientation;
  • Over-size or Under-size parts;
  • Improper insertion;

Machine Issues:

  • Bad Alignment;
  • Wrong ram speed;
  • Loose fixtures;
  • Low Hydraulic / Pneumatic Pressure.


The solution is a press-fit force monitoring system that ensures that the press-fit assembly process is monitored properly and quality issues are caught in real-time.  The monitoring system uses force measurement to catch defects accurately and reliably and perform real-time analysis to continuously improve manufacturing and achieve higher press-fit assembly productivity. FUTEK's load cell sensors are ideal for these applications, as they output extremely accurate results through millions of assembly cycles. 


The press fit operation station can also be equipped with a displacement transducer to measure the movement of the press ram during the operation. The data captured by these two sensors, force, and displacement sensors, provides force-displacement measurement for press fit feature checks: Force vs. Time, Distance vs. Time, and Force vs. Distance.

determining press fit force assembly force sensor load cell Force-Displacement Measurement
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Multi Axis Sensor, Force, Torqueapplications Determining-Press-Fit-Force-Assembly
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Z540-1 ANSI Certified17025 ISO Certified9001 ISO Certified13485 ISO CertifiedU.S. Manufacturer
+
Please follow us on linked inPlease follow us on twitterPlease follow us on youtubePlease Email us for additional info
+
10 Thomas, Irvine,
CA 92618 USA
All other trademarks, service marks and logos used in this website are the property of their respective owners.
© 1998–2022 FUTEK Advanced Sensor Technology, Inc. All rights reserved.