Press fitting thumbstuds?

DCL Knives

DCL Knives

Joined
Jun 6, 2012
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I've been working on my first friction folder and was about to start on the thumbstuds when I realized I had no idea what I was doing :o

I'm working with a 3/16" stop pin in a 1/8" 3v blade

I was looking online and found some .1872 and .1870 reamers, would one of those be around the right size for this? I'm using a cheap drill press that probably has a bit of slop, and the only way I have to force it in there is with a hammer :D

If anyone has any advice I would really appreciate it, thanks in advance,
Drew
 
Last edited:
el0147 said:
I've been working on my first friction folder and was about to start on the thumbstuds when I realized I had no idea what I was doing :o

I was looking online and found some .1872 and .1870 reamers, would one of those be around the right size for this? I'm using a cheap drill press that probably has a bit of slop, and the only way I have to force it in there is with a hammer :D

If anyone has any advice I would really appreciate it, thanks in advance,
Drew
Click to expand...

Press fitting depends on the interference of two parts.




Different reamer sizes will give different hole sizes, but unless you're comparing it to something... useless.
 
Well I do thumb studs for liner locks. The thumb studs are threaded and I have a counter sunk hole drilled through the blade to accept the screw size. Frank
 
Frank Niro said:
Well I do thumb studs for liner locks. The thumb studs are threaded and I have a counter sunk hole drilled through the blade to accept the screw size. Frank
Click to expand...

Thanks! Do you think that would still work if the thumbstud also acted as the stop pin?
 
Good ideas... ^

You can go .1865 or about .001 under for a press fit. Hit the reamed hole lightly (.01 deep?) with a .188" or so (.1875-.1885) reamer to line up the pin and it will press easier. An arbor press will help a lot with a press fitted pin and should not cost a ton.

Tram your drill press if it is off, (or change bearings) it will take a bit of time but will be more than worth it. A tiny bit of slop is probably OK...
 
12345678910 said:
threaded rod and two studs, no countersink ?
Click to expand...

That could work too, and would probably be harder to mess up. Thanks, I'll see if I can find any for sale somewhere that might work.

Thanks for the help Mr. Fairly, my drill press was surprisingly square when I checked it with the coathanger trick, so that shouldn't be too big of a problem. I have a half ton arbor press for kydex, but I'm not sure that it would be enough.
 
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