Hello, I have an Arduino Mega 2560. I can see four holes that could be used to mount the board to another object. However, there does not seem to have enough space surrounding each hole to use two spacers to sandwich the board. Any suggestion on what kind of spacer would work?
Thin nylon kind, 4-40 hardware size?
Thanks. By 4-40, do you mean 4mm in diameter and 40mm in length? I think the thickness of the cylinder spacer is the problem.
He is referencing the American designation for screw sizes. It's a number 4 screw with 40 threads per inch.
In metric, I would recommend an M2.5-0.45 socket head cap screw(hex socket). The standoff can be an M2.5 nylon spacer about 6mm long. The screw length will be around 10mm depending on the thickness of your base material.
Thanks. I don't know if it is just me. I am unable to insert a spacer at the two corners (the one next to the usb connector and the one next to pin23).
Arctic_Eddie:
He is referencing the American designation for screw sizes. It's a number 4 screw with 40 threads per inch.In metric, I would recommend an M2.5-0.45 socket head cap screw(hex socket). The standoff can be an M2.5 nylon spacer about 6mm long. The screw length will be around 10mm depending on the thickness of your base material.
Do you mean M2.6 rather than M2.5?
I normally use 4 stand-offs and 2 retaining nuts, a dab if thread lock if it's going into a unit that will move or vibrate.
petercohen:
Hello, I have an Arduino Mega 2560. I can see four holes that could be used to mount the board to another object. However, there does not seem to have enough space surrounding each hole to use two spacers to sandwich the board. Any suggestion on what kind of spacer would work?
petercohen:
Thanks. I don't know if it is just me. I am unable to insert a spacer at the two corners (the one next to the usb connector and the one next to pin23).
My solution - (and maybe other people do it to) - is to use an M3 nylon kit, which comes with nylon M3 screws and hexagonal (hex) spacers.
Whenever there is not enough space next to a header, I just use a toe-NAIL CLIPPER to snip off a little bit of the screw head. Don't use scissors for this, since it may slip and slice your fingers; or may end up breaking the scissors handles. A large size nail clipper is the best.
If there are headers on both sides getting in the way, then just snip opposite sides of the nylon screw head.
I like to use nylon spacer kits rather than metal kits .... good electrical insulation, no short circuits.
Kenny
