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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
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Tang Hole Chamfers?
Hi all,
I have a few quick questions regarding the chamfer of holes when drilling through a full-tang (pre-HT stock removal cpm154cm). 1. Holes drilled for weight reduction. I believe these should be chamfered to reduce the chance of stress cracking during HT.... correct? 2. Holes drilled for scale pins. I know these should be chamfered and have been doing so. 3. Tang holes drilled for bolster pins. Yes or no chamfer? Not sure. Thanks! __________________ Stay away from fast women and slow horses |
#2
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Holes should be chamferred if you think it will help you to get a pin through the hole, not needed to prevent stress cracking. Stress cracking is usually only a problem on sharp internal corners...
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#3
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Rockhound,
I follow Paul Bos' advice on holes "chamfer all of them" especially the CPM steels (M2, D2,154 etc..). Remember to use number and letter drills for clearance, Example, for a 3/32 pin I use a number 41 drill for .003 clearance. You can find a chart at this link http://www.auto-ware.com/techref/drillsizes.htm Regards, __________________ Brad Johnson LTC, Ret KMG since 1991 [IMG][/IMG] http://bradjohnsonknives.blademakers.com/ |
#4
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I chamfer my handle pin holes and holes for weight reduction , little more space for epoxy to bond, dont know if it makes a difference or not but I havent had any handles come off yet........for more security piece of mind corby rivets are great
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#5
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Sounds like cheap insurance to me. I do it on all pin holes.
__________________ Carl Rechsteiner, Bladesmith Georgia Custom Knifemakers Guild, Charter Member Knifemakers Guild, voting member Registered Master Artist - GA Council for the Arts C Rex Custom Knives Blade Show Table 6-H |
#6
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I agree with this logic and appreciate the great advice from everyone.
Thanks! __________________ Stay away from fast women and slow horses |
#7
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FWIW...
I broke this one post-HT. Not a big deal, I have two other knives in progress and this was a good learning experience. I was trying to correct a slight bow using the 3-dowel method in a table vise (I didn't have high hopes of correcting the bow). I gave it undue stress and noticed that it failed (near the center dowel) on a weight-reduction hole that I had drilled but not chamfered. __________________ Stay away from fast women and slow horses |
#8
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I wonder why yours warped so badley. Mine were A2 and sent to texas knife like you did yours and they didn't warp at all that I could tell. One was pretty uneven too. If you could think of anything that may have caused it in particular I would be interested to know.
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#9
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What the best bit for chamfering?
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#10
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I wonder why yours warped so badley. Mine were A2 and sent to texas knife like you did yours and they didn't warp at all that I could tell. One was pretty uneven too. If you could think of anything that may have caused it in particular I would be interested to know.
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#11
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Quote:
I was fighting this one from the start. It began with the billet... ATS-34 and NOT precision ground. I do stock removal profiling with an angle grinder and drilling with a press but everything else is hand files and sandpaper. Even minor imperfections (caused by myself or poor stock) can be difficult to correct (as I'm sure you know). In this case I was fighting a slightly bowed billet from the git-go. I thought I had it corrected and both sides flat prior to HT but I believe that the natural bow recurred during HT or Cryo due to those stresses.... just a guess... not the HT service's fault. I'm now working with CPM154CM which is precision ground. So much easier to work with for someone like me using minimal equip. I don't foresee this same problem happening to me again. Definitely sold on precision ground billets now. __________________ Stay away from fast women and slow horses |
#12
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I see, that must be a factor. I've only ever bought precision ground. I was just curious because I knew our methods were so similar.
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#13
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best bit for chamfering a hole up to 1/4 inch is a solid carbide 82 degree countersink. Unless you try to chamfer an already hardened piece of steel., the countersink will work for thousands of holes.MSC has them at a reasonable cost. Bob Levine, Knifemakers Guild mentor
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#14
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Thanks Bob
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Tags |
advice, angle, ats-34, auto, bee, drill, files, flat, hand, handle, knife, knives, mentor, pins, post, press, rivets, sharp, steel, stock removal, tang, vise |
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