safety interlock for cheap Chinese laser at Hac DC
This switch is a lug style wafer for insertion between the exhaust collector and the exhaust nozzle on the back of the laser chassis.
When the exhaust fan is running and air is flowing the switch will operate to allow the laser to fire. This switch is upstream of
the exhaust fan so air will leak into the exhaust stream, not exhaust leaking out into room air.
James Sullivan
5-5-17, v2
OpenSCAD version 2015.03-1
--dimensions from mating exhaust nozzle--
nid=60; //nozzle inner diameter
nod=80; //nozzle outer diameter
mod=100; //maximum outer diameter
sh=30; //step height
sw=5; //step width
oah=50; //over-all height
tlw=3; //top ledge width
bcd=46.8*2; //bolt circle diameter
bhd=3.6; //bolt hole diameter
fw=12; //foot width
fh=15; //foot height
fod=108; //foot outside dimension, from outside edge to outside edge
fid=(nid+nod)/2;//foot inside dimension, from inside edge to inside edge
*/
fid=60; //flange inner diameter, same as nid
fod=80; //flange outer diameter, same as nod
bhd=3.6; //bolt hole diameter
bcd=93.6;//bolt circle diameter
thick=5; //thickness of flange - originally 3, but warped when removing from printer bed
flap=3; //thickness of flap - originally 3, but warped when removing from printer bed
hph=bhd*2; //hinge pin height above center line, i.e. butterfly offset. Reduce to make switch more sensitive. Increse to make switch more stable. - originally 10
sfw=fid-thick*2; //switch flap width - originally sqrt(fid*fid-4*hph*hph)
shd=2; //switch hole diameter
shp=10; //switch hole pitch, i.e. center to center spacing of mounting holes on microswitch
srh=12; //switch roller height, i.e. height above switch hole centerline where switching action occurs