Blind Standoffs, Mounting Feet for PCBs
See also, post #1110
We have covered chassis PCB mounting without the need of drilling through the chassis itself.
This method used a M2 brass insert in an Acrylic foot; the height of the finished foot is about 3.5 mm.
The assembly is glue welded with DCM (Methylene Chloride) to the chassis inside surface.
There are, however, times when the 3.5 mm brass insert foot is too high.
See also:
About 6 months ago I ordered Phillips M2 FLAT headed screws.
The screw heads are only 0.34 mm thick with a diameter of about 4 mm.
With the flat headed screws being so thin a shorter PCB mounting foot can be made.
The following method does not require a brass insert.
Used here is 1.6 mm Acrylic plastic feet that measure 8 mm by 8 mm.
For the foot to lay flat on the chassis inside panel, the screw head needs to sit in a counter sunk well.
A square cut 6 mm milling bit is used to counter sink the screw hole to a depth of 0.4mm.
A drill guide, made from PCB material, is clamped on top of our work to prevent the milling bit from skating on the Acrylic plastic, when making the counter sunk hole.
The images below discuss the process for making the shorter mounting foot.
At the time of this writing, example where you can get the screws from:
(I got mine from a different vendor)
eBay has many other vendors.