Gauging Enclosure Screw Holes, JLCPCB Nylon Enclosure of 202303

[ForrestErickson]

Notes on the JLCPCB Enclosure Screws.

For the PCB mounting holes.

Using drill bits as gauges I find that a 7/64 " - 0.109 drill enters the holes to near but not quite to full depth.
A number 34 drill bit, 0.111" (2.82mm) enters the holes only about 1/8' to 3/16 with noticeable sliding resistance.

A #4 has no grip.
A #5 would have about 14/1000 interference.
A #6 would have about 27/1000 interference.

A metric M3 will have about 0.18mm or 7/1000" interference.

[ForrestErickson]

Lee has only 12 M3 screws in stock and they are too long (10mm) for the application.

Looks like Lowes has something that will work, 3mm x 8mm.
https://www.lowes.com/pd/Hillman-3mm-0-5-x-8mm-Phillips-Drive-Machine-Screws-14-Count/999994896

[ForrestErickson]

Before driving to purchase M3 screws, I tried some of my too long M3 screws with a nut on them to shorten them and found that they are too small. Some of them slid down into the hole even under light pressure on the Philips head screw.

I finally used some 6-32 which I cut to length. They had good retention force and acceptable torque.

I ran out of the tiny screws for the side connection but used some screws I think are # 2 machine screws on one unit.

[LokiMetaSmith]

We will need a different BOM for hardware for different 3D printing techniques. Good to know!

…

On Tue, Apr 25, 2023 at 1:46 PM Forrest Lee Erickson < ***@***.***> wrote: Before driving to purchase M3 screws, I tried some of my too long M3 screws with a nut on them to shorten them and found that they are too small. Some of them slid down into the hole even under light pressure on the Philips head screw. I finally used some 6-32 which I cut to length. They had good retention force and acceptable torque. I ran out of the tiny screws for the side connection but used some screws I think are #2 <#2> machine screws on one unit. — Reply to this email directly, view it on GitHub <#220 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABGR5JGZTQCBPTQX4JYCISTXDALZVANCNFSM6AAAAAAXLDBE5I> . You are receiving this because you were assigned.Message ID: ***@***.***>

-- Lawrence Kincheloe