Steel Dowel Pins: Two from One Piece, Necked, Hardened and Ground (Stanley 1919)

Die makers made their own dowel pins two at a time: one piece of steel is turned, necked in the middle, hardened, ground dead straight to size from each end, then snapped in two at the neck. Frank Stanley described the practice of one die shop. Source: F. A. Stanley, Punches and Dies (1919), pp. 417–419. The choice of tool steel and the forge for hardening are ours; the passage gives no hardening heat. Picture: Stanley's Fig. 610, grinding dowel pins.

متوسط

1 day

التعليمات

Cut stock for two pins

Take a length of steel a little larger than the dowel size and long enough for two pins. It must harden, so use tool steel (our choice).

المواد لهذه الخطوة:

قضيب مثمّن من فولاذ العدد1 length for two pins

الأدوات المطلوبة:

ملزمة منضدة

Turn 0.008 in over size

Turn it on centres to about 0.008 in above the finished size.

الأدوات المطلوبة:

مخرطة معادن

كلّاب المخرطة

ميكرومتر

Neck it in the middle

Cut a neck 1/16 in deep in the middle, the dividing line between the two pins.

الأدوات المطلوبة:

مخرطة معادن

Harden

Harden the piece. This passage gives no heat; heat to hardening heat and quench in the usual way for your steel (ours).

الأدوات المطلوبة:

كور الحدّاد

ملقط

حوض تبريد الحدادة

Grind each half to size

Put it on dead centres in the grinding machine and grind the diameter to size from one end to the neck. Reverse it on the centres and grind from the other end. The pins come out perfectly straight from end to end.

الأدوات المطلوبة: