General > General Technical Chat
Very small screws. Replacing or fixing
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rdl:
Does the box have threaded metal inserts or do the screws just go into plastic?
ThunderZed:
The 2 "shells" are made only of plastic (see attachment).
I'll try with a local computer repair shop but I guess it will be just luck if I'll find what I'm looking for because I've already searched "laptop m1.2 screws" on aliexpress but I got nothing. I think the main problem is the length, I mean you can find a lot of M1 and M1.2 screws but not so long as I need. I bet the device brand asked a 3rd brand to build these special screws, I mean it could be a unique patent.

Now some questions about your above suggestions:


--- Quote from: jpanhalt on April 04, 2022, 07:55:13 pm --- I use annealed copper or lead strip in a 3-jaw or 4-jaw to keep from damaging the threads.
--- End quote ---
I didn't understand the advantage. If I fully screw them down to the wood so only their heads are out, how could I damage their threaded parts?


--- Quote from: Gregg on April 04, 2022, 09:32:03 pm ---You could possibly grind or file the worn part of the head flat and silver braze another torx or similar head cut off another suitable fastener.
The trick is to get both surfaces as flat as possible and use as little as possible high silver content silver braze wire.
--- End quote ---
Honestly? Arab for me. I admit I'm a too much beginner for that. I can only guess you suggested to use silver brazing sticks like these but... 1) I think I need a right tool for soldering and 2) I first try to find cheaper solutions if possible. Anyway if I misunderstood please explain that in other words.

--- Quote from: dunkemhigh on April 05, 2022, 05:20:34 pm --- Instead of a saw blade like that, perhaps a Dremel-sized cutting disk:
--- End quote ---

--- Quote from: richnormand on April 05, 2022, 06:29:36 pm --- diamond wire homemade "saw" to make a slot in the damaged head
--- End quote ---
Like this one?
I've just found my saw blade is too large for this job so I wonder if the best solution for me is a diamond wire in a C clamp or a diamond disk. I know the wire diameter will be about 0.26mm but what about the disk width?
PlainName:
From the Dremel website it seems the disc is 1mm thick. But they explicitly say not to cut metals with it, so I guess that's out.
richnormand:
From ThunderZed:

"Like this one?
I've just found my saw blade is too large for this job so I wonder if the best solution for me is a diamond wire in a C clamp or a diamond disk. I know the wire diameter will be about 0.26mm but what about the disk width?"

Exactly. Wire is available in several thickness and quite good. I cut sapphire and glass stuff with it too in my automated see-saw jig.
Also if you are near a hobby shop you might be able to get a whole kit with several wire thickness.
Only drawback of diamond saws is to keep the wire well lubricated with water or it will tend to load up with soft materials or to break.
Once you have the basic kit you will find many more applications for it.

This link will give you an idea of the various diameters available
 https://www.mtixtl.com/diamondcuttingwires.aspx
I got about 200 feet of the 0.25mm about 10 years ago and I am not past the halfway point on the spool.
ThunderZed:
Thanks for your suggestion, I think I'll get some diamond wire. What do you think is a perfect wire diameter for my job? Remind the screws heads are 2-2.25mm and the not threaded part is 1mm. I think I'll buy it on aliexpress and there're several options:
- https://www.aliexpress.com/item/1005002768044594.html - from 0.028mm to 0.1mm x 200m - about 2USD
- https://www.aliexpress.com/item/1005001320421686.html - from 0.04mm to 0.1mm x 100m - about 2USD
- https://www.aliexpress.com/item/4000614589146.html - 0.26mm or 0.38 x 1m - about 3USD
- https://www.aliexpress.com/item/4001042615745.html - 0.4mm or 0.6mm x 1m - about 5-7USD
I'd not consider more than 0.6mm, imho.
By the way what's better to use for my job, a c clamp or a "pull rod" as you can see in the 2st item description picture?
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