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Four pieces of t0.6 brass sheets were soldered together.
t0.6の真鍮板を4枚ハンダ付け。
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They were drilled and shaped by mill. Shape other than tip was not important and the shaping was quite rough.
フライスで穴あけと外形削り。外形は先端以外どうでもいいのでかなりいい加減。
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They were de-soldered and bent to form brackets for collector positioning springs.
これをバラして曲げるとこんなものができる。これは上枠用のなびきバネ掛けである。
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I made a jig to temporarily fix parts of frames and silver soldered the brace.
上下枠の斜材を銀ロウ付けするためこのような治具を作った。この斜材、ハンダ付けだと簡単にポロッと取れそうなので銀ろう付けにした。
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Silver-soldered. The jig was made from aluminium to prevent flowing of the solder to the jig.
銀ろう付け完了。治具がアルミなので銀ロウには付かない。
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Pickled lower frames.
酸洗いした下枠。
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Parts of upper frame were set on the jig. Arrowed parts were collector spring brackets.
上枠の斜材となびきバネ掛け(矢印)を治具にセット。
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Silver-soldering was not easy because parts heat expansion.
銀ろう付け完了。熱で部材が伸びて大変であった。
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Finished upper frames.
出来上がった上枠。
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