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Achieving firm grip on a small circular object

Dagmara Sajdak

Hello,

I'm new to the IET community so I'm not exactly sure if I'm going about using the resources correctly. 

I have come across a problem in one of my projects some weeks ago so I would love to hear what more experienced and knowledgeable people in the industry think. 

How would you grip a small round steel part with a height of only 3-4 mm and diameter of app. 22 mm.

Holding the part is not the essence of the problem. The part has to be able to withstand torqueing another part into it at up to 40 Nm. 

The solution I used worked semi-well for the purpose but the grip is definitely not strong enough because the parts are coming out damaged more often than not. 

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    Depending on the circumstances another approach might be like fitting a steel "tyre" to a wheel - i.e. made a "holder" with a round hole somewhat smaller than the part you're trying to grip - then heat it up to expand it and drop your part in - as it cools it'll then grip the circumference very evenly. Heat again to release. I gather induction heaters are often used for this sort of thing in industry. Obviously no good if your part isn't tolerant of rather severe heating, but might work for a few cases.

       - Andy.

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    Depending on the circumstances another approach might be like fitting a steel "tyre" to a wheel - i.e. made a "holder" with a round hole somewhat smaller than the part you're trying to grip - then heat it up to expand it and drop your part in - as it cools it'll then grip the circumference very evenly. Heat again to release. I gather induction heaters are often used for this sort of thing in industry. Obviously no good if your part isn't tolerant of rather severe heating, but might work for a few cases.

       - Andy.

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