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Winding Stem Exam Practices

Over the course of the next month or so, we continued to practice making winding stems, to make sure we were competent at each of the processes required to produce a stem. With both micro mechanics exams only 4 weeks apart, we also began preparing for the second exam in which we were required to […]

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Winding Stem for an ETA 6497

We were now given the chance to start making complete winding stems from start to finish in preparation for our first micro mechanics exam. For the exam would we would be given 8 hours to make a winding stem from scratch to match the technical drawing provided by WOSTEP in Switzerland. We had a choice […]

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Winding Stem Blank using a Horia Lathe and Motor

So now we were finally able to make a winding stem, well a winding stem of sorts, using the Horia lathe and motor. It wasn’t a complete stem as it lacked a square, slot, thread and a burnished pivot. It was also rather large in size relative to a functioning winding stem. For this exercise […]

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Filing Squares

The last exercise to complete before we started making the first winding stems was to perfect the art of filing squares. We had to make a set of 5 squares with the last of the set being just 0.60mm in diameter with a tolerance of +/-0.03mm. This would be the start of very small tolerances […]