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The Newbies Arena Are you new to knife making? Here is all the help you will need.

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  #1  
Old 06-12-2001, 09:02 AM
Nathan House
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Corby bolts drilling question


I am wondering about using cory style or hidden bolts
the threads in the hidden bolts are 8/32
I know you need a step drill to do it the head of the hidden bolt is 5/16.
My question is how do you know when to stop drilling
in to the handles,I think I know but want to be sure
also were can I get a step drill I need for a 8/32
step drill for the metal drilling part I have found them in the 5/16 taht is the size of the bolt head,does the 5/16 have the 8/32 on the step down part.
I hope this all made sence.
Nathan
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  #2  
Old 06-12-2001, 10:10 AM
Mike Conner
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Nathan,
All of the knife supply houses have the step drills for what you are wanting to do. Some of the suppliers call them rivet drills and they come in a variety of combinations of sizes. For the Corby rivets that I use the bit steps from .312 down to .220. The actual diameter of the female half of the threaded portion of the Corby is around .218 in diameter. I normally drill the holes in the tang at .223 dia prior to heat treat. When I am ready to attach the scales I use the hole in the tang as a piliot and drill a .218 dia. hole through the scales from the inside, then I set up on the drill press and using the step drill, I drill from the outside of the scale to the depth I need. I normally like to leave about .093 material, but sometimes I leave less depending on the knife and the scale material I am working with.
Hope this makes sense and you might also look at the tutorial section here at the CKD. Lots of information there from makers with much more experiance than me.
Mike
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  #3  
Old 06-12-2001, 02:19 PM
Nathan House
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thanks mike,I now the drills you are speaking of
why not just drill the scal and tang with the step drill
8/32 the male end on the bidden bolts what does that brake
down to in a drill size.I want to know that size the is the most
important to me
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  #4  
Old 06-13-2001, 02:27 PM
Geno
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Nathan,
I use two drills instead of worrying about too much at once.
I don't use store bought twist rivets, but if you measure the two diameters and get some drills that are just a couple of thousandths bigger than, you'll have enough.
Use the smaller drill to run through the whole piece, handle and tang while everything is clamped down in place. This hole HAS TO BE STRAIGHT!,or the rivets won't work right.
Next take it apart and set your drill press up like in the video.
With the Handle (or bolster) Material facing up, and the tang (inside) side down on the work table of your press, line up the depth of the stroke with the bottom of the drill (with the drill neck fully extended down) and tighten the table there.
Remember that the top of the drill's bevel is where you are going to rest with the bottom of the screw head on final fit up, so set it to that depth (not really the bottom of the drill,OK)
Next DOUBLE CHECK everything before you turn the machine on .
The machine will bottom out it's stroke at the same spot .
Look at the handle material from the side to check how deep the drill tip would go into it.

Remember you can always drill deeper if need be, but you can't put it back once it is cut out.
DO NOT let the work climb up the drill when you start to drill.
EEEEEEASE the tip into the pilot hole and "slowly" bottom the drill stroke to the same depth time after time,...
I hope the explaination helped.
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  #5  
Old 06-13-2001, 07:12 PM
Nathan House
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Hi Guys
I know that part of the video I have watched it enough
i am working on the first,I think it may trun out good
I just like to have every step in order before I take the big
plug in.I am learning from good guys like you ,you take a green horn under your wings and really help out.
I am very greatful for it,maybe one day in the near furture
I will be at a both at some knife show,and I can finally get to
see all the good people i have been emailing
Thanks Guys
Gene I think before we go stand before our lord
I do think I will get to shake your hand
hammer thumbs and all.
blessings Nathan
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