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To make the frame I started with cross beams. I made 8 beams from 5X5mm brass rod. They are basically similar to Eric's.
台枠を作る。まずは横梁から。5X5の真鍮角材から計八本作った。基本的にERICのものと同じ。
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I asked a sheet metal shop to cut out 2mm mild steel sheets to rough sizes. Two of them for the frame plates were soldered together.
則枠は鉄工所で概略切ってもらったものを二枚ハンダ付け。
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Edges were cleaned out by mill. I used roughing end mill with plenty of cutting fluid then finished with normal four flute end mill.
これをフライスできれいにする。切削油をジャバジャバかけつつラッフィング・エンドミルでガンガン削る。最後に通常のエンドミルで仕上げた。
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I attached printout of the hole locations to the work. I use DRO for positioning and attaching printout seems redundant, but it is good way to find out misreading of the drawing.
穴位置のプリントアウトを貼って穴あけ。プリントアウトを貼ると図面読み違えによるミスを発見できる。一箇所危ない所で1mmの間違えを見つけた。
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The openings of the frame were cut by slot drills.
フレームの開口部分は二枚刃エンドミルで開ける。
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All necessary holes were made.
穴あけ完了したフレーム。
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Pedestals were cut by roughing end mill. It was much easier than ordinary four flute end mills. The accuracy is important for this job and I tightened the jibs of the mill beforehand.
ペデスタル部分をラッフィング・エンドミルで切削。通常のエンドミルよはるかに楽だ。なお、この作業は精度が重要なのでテーブルのカミソリを締めあげておいた。
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The pedestals were finished with four flute end mill.
ラッファーを通常の四枚刃に替えて仕上げ。
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Recesses for spring shoes and horn stays were milled.
バネ受けと軸箱控え取り付け部分切削。
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Mostly machined frame plates.
ほぼ切削完了したフレーム。
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