Need help ID drill bit

samuraistuart

samuraistuart

Joined
Dec 21, 2006
Messages
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A few years ago I bought a handful of corby bolts but I can't remember from who. They recommended I use this little particular drill bit to ream out the hole for the larger head diameter, so I bought it and it worked really well. This little guy is for corby bolts that have a 1/8" shaft and a 3/16" head. Recently I bought a few larger corby bolts, 3/16" shaft and 1/4" head, and I would like to get a hold of the same type of drill bit. I don't even know what this thing is called, and I can't find any from the usual knife supply houses. If you know this little guys' name and where to find a larger one, that would be the bees knees. Thanks for the help.

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I don't know about this particular one, but I have been using a bit from Pop's that has worked well for me. It looks like a reamer with a little pilot point at the bottom.
 
Jantz. Wow I forgot them altogether. I don't use them much. That answered my question. Thank you Hubert, Eric, and Richard!
 
If you use Corby bolts regularly (or on all knives) getting carbide counterbore drills from USA Knifemakers is a good idea. They will last a LOT longer and bore very precise seats. They make them in every size to fit their Corby bolts from the extra small to the large ones. The extra small Corby bolts look like regular pins, but are much more secure.
 
Walter sorrels calls them step drills. He has an amusing, but informative video on how to make your own (“50 ways to make a step drill”). Corbys do not appear to be a consistent diameter between sources, so a step drill bought from one source might not work really well with corbys bought from another source. So … if you have a micrometer, making your own to fit your corbys is an option.

(Warning though - I once posted a thread saying that I was impressed with the success I had in making my own step drill, and several people on the forum proceeded to ream me a new one (pun intended) for doing so. “Use the right tool for the job” they said. Well, I am still using that self made bit for those old corbys with great success… so I put it out here as an option)
 
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Thanks Stacy, I saw those and wondered if they were any better than what I was used to. I figured they must be, but I don't use a whole lot of corby's so just wanted to stick with what I know. I might start using them more often, and if I end up doing so, I'll be sure to check the carbide bit.

Thanks for the advice, Cushing H.
 
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