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HDT testing equipment

Hardware

By @UlmerMan

  • 1 Devlogs
  • 1 Total hours

This project is about developing an automated device for measuring the Heat Deflection Temperature (HDT) of thermoplastic materials. The aim is to create a simple and reliable system that can determine the temperature at which a thermoplastic specimen deforms under a defined load. The specimen is placed inside a heated chamber and gradually heated at a controlled rate while a constant weight is applied. As the temperature increases, the specimen begins to bend under the applied load. A mechanical detection system monitors the deflection and triggers when a predefined amount of deformation is reached. At that point, the system records the temperature, providing the Heat Deflection Temperature of the tested material.
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@UlmerMan on HDT testing equipment

51m 16s logged

Stardance Devlog No. 1

I’ve made a rough schematic of my device for automatically measuring the Heat Deflection Temperature (HDT) of a given thermoplastic.

The specimen will be placed inside a furnace and heated at a rate of 1°C every 30 seconds. A defined weight will be applied to the specimen, and as the plastic begins to deform under the load, it will eventually bend far enough to close two electrical contacts.Once the contacts close, the system will record the current temperature as the HDT of the material.

The next step is to refine the mechanical design and work out a reliable way to detect the deflection while keeping the temperature measurement accurate. I also need to do the layout and maybe switch MCU when I need a more powerfull one.

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