Counterbore Service Needed

B

Bsafe

Joined
Dec 27, 2020
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15
Hello,

I am not a knife maker, but I decided to try to make my own multitool. I am almost done, but I need to counterbore two holes—each for a 0.140” diameter screw head—about 1.5-1.6mm deep in one of the titanium scales (which is 2.1mm thick). The problem is that the extent of my tooling is a Dremel and a cordless drill, so I am unable to do it on my own. Is anyone able to help with this, or know someone who could help?

Thanks!
 
For about $120 you can get yourself a WEN tabletop drill press, and counterbore bits aren't very expensive.
 
You might want to change those to flathead screws so you are countersinking rather than counterboring if the scales are that thin. That's getting pretty flimsy on the remaining material. 2.1mm-1.6mm = 0.5mm (that is only ~0.020" - or the thickness of about 5 sheets of paper).

On the plus side, those are easier to do yourself also. Just make sure you match the countersink angle to the type of fastener. 82° for inch fasteners and 90° for metric.
 
The counterbore will be 1.5-1.6mm of the 2.1mm? So the counterbore will remove over 70% of the thickness... I am with E eKretz that sounds like you are removing too much material and the structural integrity might not be left with enough for the desired strength. I am not an expert on this but it is concerning as the usual counterbores I see are at most maybe 50% of the material thickness.
 
eKretz said:
You might want to change those to flathead screws so you are countersinking rather than counterboring if the scales are that thin. That's getting pretty flimsy on the remaining material. 2.1mm-1.6mm = 0.5mm (that is only ~0.020" - or the thickness of about 5 sheets of paper).

On the plus side, those are easier to do yourself also. Just make sure you match the countersink angle to the type of fastener. 82° for inch fasteners and 90° for metric.
Click to expand...
Thanks for the suggestion, I didn't even think about that. I will definitely switch to flathead screws.
 
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