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Frank A. Stanley · Public domain (1919)
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.
Katamtaman
1 day
Mga Tagubilin
1
1
Cut stock for two pins
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).
Mga materyales para sa hakbang na ito:
Oktagonal na barang tool steel1 length for two pinsMga kailangang kasangkapan:
Bais sa Mesang Panggawa2
2
Turn 0.008 in over size
Turn 0.008 in over size
Turn it on centres to about 0.008 in above the finished size.
Mga kailangang kasangkapan:
Torno para sa Metal
Panghila ng torno
Mikrometro3
3
Neck it in the middle
Neck it in the middle
Cut a neck 1/16 in deep in the middle, the dividing line between the two pins.
Mga kailangang kasangkapan:
Torno para sa Metal4
4
Harden
Harden
Harden the piece. This passage gives no heat; heat to hardening heat and quench in the usual way for your steel (ours).
Mga kailangang kasangkapan:
Pandayan ng panday
Sipit
Timbang pampatigas5
5
Grind each half to size
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.
Mga kailangang kasangkapan:
Silindrikong panggilingPanghila ng tornoMikrometro6
6
Break the pins apart
Break the pins apart
Break the piece apart at the neck. You have two dowel pins ground closely to standard size; ream their holes true and straight to fit.
Mga kailangang kasangkapan:
Bais sa Mesang PanggawaMga Materyales
1- 1 length for two pinsPlaceholder
Mga Kinakailangang Kasangkapan
8- Placeholder
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