Reconstruction of a grand (school of J. A. Stein c1780) Detail: Hammer shanks

 

Documentation and re-engineering

Documentation of the original object. The material could be identified as of maple by eyesight.

Measuring by microsope gave the following dimensions:

The conical hammer shanks have a width of 3,8 mm at the axle decreasing to  2,0 mm  (bass), to 1,4 mm (treble) resp. at the head.

 

Traces of work processes at the original permit a hypothesis about the tools used (hand cut files or rasps, scrapers), and actions, here at the bend of the beak.

Traces of filing at the transition from axle to shank.

 

Production hypothesis 1:

Step 1:

Making a block of maple in the shape of the hammer shanks

Hammerblöckchen
 

Step 2:

Cutting the single shanks, shaping to individual measures with a file and card scraper.

Hammerstiel
Hammerstiel
 

  Result 1:

In principle it is possible to make the hammer shanks following this procedure but it is difficult to achieve the continuous decrease of dimensions in a controlled manner.

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Production hypothesis 2:

Grading the shank in a box with a conical groove, by slight shift the differences in sizes of shank ends from bass to treble can be achieved easily and under control. After the right-angled grading only the edges have to be rounded and smoothed using scrapers. 

Feilen in der Lade
Bearbeitung mit Ziehklinge
 

Result 2:

Grading in a box permits a continuous decrease from bass to treble. The traces of this procedure are resempling those found at the original objects by using the assumed tools, hand cut files and scrapers.

61 Hammerstiele
 
 
 
 

Work details

Hammerstiele/hammer shanks
Hammerstiele/hammer shanks

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