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Tips from the Cal Lab – Setup Reduction with Morehouse Quick Change Adapters

Morehouse employees went through a lean manufacturing course. Part of this course emphasized reducing cycle time, by reducing the amount of time it would take to set up equipment for a load cell calibration. During the class, the concept “quick changeover” was discussed and applied to a single piece flow.  We had the idea to apply some of these setup reduction concepts to our force calibration lab, since the lab workflow mimics that of single piece flow production. We discovered that a set of universal tension members in our calibration machines could be used along with a few mating adapters, and this reduced three shelves full of various adapters down to half a shelf.   Soon after building these for our lab, visiting customers started asking for their own sets, and we decided to start offering Quick Change Tension Member Assemblies.  Do you want to improve your measurement process, save space, and reduce long term cost of purchasing many adapters for each instrument you need to calibrate? 

Quick Change Tension Members and Adapters help with the following:

  • Reduce Tension Changeover Time
  • Improve Alignment by using a Spherical Radius Contact as Defined by ISO 376  (note below)
  • Improve Alignment and better Repeatability 
  • Reduce Overall Calibration Cycle time
  • Simplify Setups by Using One Tension Member with Several Adapters
  • Standardize Production Flow
  • Available for capacities up to 500kN or 112,000 lbf. 

 Quick Change Adapter in Morehouse UCM

Reducing the changeover time allows for a more efficient calibration process that does not sacrifice quality, while improving cycle time. Moreover, shorter cycle time allows for improvements regarding on-time delivery, lowered cost from excess inventory, and increase in machine capacity levels.  

These adapters simplified our laboratory setups, improved our performance with better alignment, and were cost-effective compared to the alternative of multiple pieces of threaded rod or multiple rod end type setups. As a result of optimizing the calibration setup,, we were able to standardize production flow, provide better measurements, and free additional floor space for future expansion. 
Full Product Guide on Quick Change Tension Members can be downloaded here 

ISO 376 Note:

Morehouse Quick Change Drawing
ISO 376 recognizes the importance of adapters in reproducibility conditions of the measurement.   Proper adapter use in accordance with ISO 376 Annex A, helps ensure the reliability of reported measurements.  Note:  Annex A is not a requirement for labs to adhere to.

A.4 Loading fittings

A.4.1 General

Loading fittings should be designed in such a way that the line of force application is not distorted. As a rule, tensile force transducers should be fitted with two ball nuts, two ball cups and, if necessary, with two intermediate rings, while compression force transducers should be fitted with one or two compression pads.

Morehouse Design Notes:

1.  Roark's formula for stress and strain concentration was used to verify FEA results.  
2.  Design used spherical radii called out in the ISO 376:2011 standard.
3.  Safety factor of 2:1 implemented in design

Stress Analysis Plot of Quick Change Tension Member

written by Henry Zumbrun


Posted at, June 01, 2016 12:00:00