mountpcb-assemblypcb-designsurface-mount
I'm designing small PCB(20mm*20mm) where I'm also limited by height of whole project that can't exceed 20mm. I have to place few sensors on the edge of the PCB but not facing up but facing out of the PCB so pads of sensors are perpendicular to the PCB.
Not the real design I haven't designed this part yet but describes what I'd like to do.
My question:
What is the usual way this is done?
Ultiboard appears to be exporting extra fiducials (those circular marks at the top left, bottom left and bottom right of the image you posted) which are being interpreted by OSH Park, and other online PCB fab house previews, as part of your design.
For example, I use Eagle and also use OSH Park (which is what you appear to be using) and when OSH Park previews my designs, the images are essentially zoomed in on my board outline. The preview picture will contain everything present in the gerbers... and since my board outline is the biggest thing, that's what is present in the preview.
You need to figure out how to configure Ultiboard to not export those fiducials into the final gerbers.
EDIT: I found the user manual for Ultiboard and it appears you can disable the automatic addition of fiducials on gerber export. Read the manual here and go down to page 1-19 to see instructions for how to get to the setting.
Use an inverted brass flat head machine screw. These will solder easily and depending the mechanical strength you want the part can be selected from a range with various head sizes.
Some possible candidate machine screws would be these part numbers from McMaster-Carr.
Length of 6mm
99658A524 M3 $9.68/100
96686A150 M2 $10.58/50
96686A210 M3 $7.94/50
Lower Cost with length of 6.35mm
92451A092 #3-48 $4.21/100
92451A106 #4-40 $4.29/100
92451A124 #5-40 $5.27/100
92451A144 #6-32 $5.90/100
92480A106 #4-40 $4.72/100
92480A144 #6-32 $5.85/100
This would certainly meet your criteria of being inexpensive, widely available, conductive and NOT through-hole. See the search page here.
Best Answer
I have seen this done by using two PCBs: a smaller one to hold the component is mounted 90° perpendicular to the other one. Pads on the edge of the small board (both sides) soldered to the main PCB are used as support:
These pads can consist of electrical connections, with additional redundant pads for strength. An alternative would be to use your choice of connector to interface between the two PCBs: