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Message ID: 305
Entry time: 07/06/2006 12:14:03 PM
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Snapshot of the stringing frame:
Remarks:
- 1/8" precision dowel pins
- stringing the wires using two long beams with dowel pins does not work (VT design):
the beams are ~1m longer than the 10' long later table.
Solution: Pin array arround the wire frame
- fixing the 25um wire:
clamping a wire with a socket screw and washer might be a problem.
The washer will rotate while tightening the screw and this change the wire tension.
Current solution: clamp 16 wires with one nylon block + 16 screws
- Frame support: extruded aluminum profiles from 80/20, size 1.5"x3.0" (1530)
- Dowel Pin Plates:
The W&M machine shop might not handle the job. The mill is limited in length (3')
and according to the wire scanner tests:
dowel pin location not better than 0.12mm on a 8" long board !!!
- Other concern:
- aluminum has the hightest temperature expansion coefficient. Elongation to be calculated.
- the projected wire distance on the frame is different for x and y due to the stringing
angle of 26.57deg (== arctan(1/2)). While we have a 7/16" (11.1125mm) spacing along the
long side of the frame, we only have a 7/32" (5.55625mm) on the short frame side.
So designing the dowel pin plates on the short side is a challenge.
- Misc:
- add glue bed for an additional way to fix the strung wire on the wire guide. |
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