I milled the all surfaces except ends. This picture shows cutting of second surface. Most important thing in this process was keeping right angle among surfaces. Milled first surface was pushed against the vertical surface of the precision vice assisted by a 5mm brass rod. The third surface was cut in the same way. To cut the fourth surface, the first surface was pushed against the sliding surface of the vice via parallels. I used shock-less hammer to keep good contact to the sliding surface.
端面以外の面を削ります。これは第二面を削っているところですが、直角を出すために削り終わった第一面を精密バイスの直角面に押しつけます(バイスの可動顎に5mmの真鍮棒をかましています。)。第三面も同様に削り、第四面は第一面を下にして平行棒を介してバイスのすべり面にプラハンでたたきながら密着させてから削りました。