Machining tips

Myker

Myker

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Feb 5, 2011
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Hey gals and guys, want to start a BK2 project with my brother, a known BF member, and I need some tips. Going to try some reprofilling on a CNC mill using carbide end mills, is air ok for coolant or do I need to flood it? Max depth of cut before ruining heat treat? Cut it vertical using A axis or lay it down and use a face mill?
Any other suggestions or tips would be great. Thanks for taking the time to view.Pics to follow.
 
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Thanks for posting this, brother. I'm glad you're thinking of these things. Perhaps Toooj will pop in soon and share some secrets. I have another post going with some mockups of alterations. Let me know which you like. Or perhaps you were planning on putting your own under the knife?
 
I believe Toooj will need to bring something to this thread. I'm not a machinist, so, I won't even begin to create an answer.

Moose
 
Coolant will be nessasary and will provide a better finish, I would do it vertical also; small cuts, maybe around .008"-.010" per cut.

Facemill should work fine.

make sure your speeds fast and feed is slow.
carbide loves speed......
 
So by keeping it vertical, would I kick A axis over 20 deg, positive and negative and feed in till I reach the center? Hard to picture I know but for some reason I think I'm making this way to complicated then it should be. Any videos out there showing some blades getting machined? Thanks again to all
 
Myker,

This CNC operation is dangerous, takes high skill and knowledge and I don't recommend it. If you have to ask on this forum how to do it, I would steer away.
It will also void the warranty.

I think using a belt grinder with a flat platen would be easier.

Sorry to be a party pooper.
Just My 2cents.


Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives
 
Toooj said:
Myker,

This CNC operation is dangerous, takes high skill and knowledge and I don't recommend it. If you have to ask on this forum how to do it, I would steer away.
It will also void the warranty.

I think using a belt grinder with a flat platen would be easier.

Sorry to be a party pooper.
Just My 2cents.


Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives
Click to expand...

I would definitely listen to Tsujimoto san on this!:thumbup:

I have done some genuinely certifiable operations on cutlery in the past & would not dream of attempting that one!! :eek:
 
ok ok, I shall heed the warnings and go the way of the grinder (insert bruised machinist ego!!!!) thanks for the tips and your time.
 
Myker,

Better a bruised ego than a bruised body or CNC machine. Or worse.
Grinders will reaaallly show how good of a machinst you are!
Waiting to see your results.


Hi Phil. Thanks for posting. Sage words from the "Cutlery Student" ;)

Best Regards,


Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives
 
So, with the CNC idea out, Toooj, do you have any advice for not ruining the heat treat on a knife even with a grinder? My guess is that these questions are hard to answer because such actions on a knife immediately void the warranty, but I, and I'm guessing others, would really appreciate any input you might have for not destroying the knife, while at the same time "destroying" the knife.
 
sqoon said:
So, with the CNC idea out, Toooj, do you have any advice for not ruining the heat treat on a knife even with a grinder? My guess is that these questions are hard to answer because such actions on a knife immediately void the warranty, but I, and I'm guessing others, would really appreciate any input you might have for not destroying the knife, while at the same time "destroying" the knife.
Click to expand...

If you keep your finger on the reverse side of a blade while grinding it, the nerves on your finger will remind you when it is time to plunge it into water! :D
 
Sqoon,

The esteemed Mr. Gibbs has it correct.
The blades were tempered around 450 Deg F.
Keep the blade temp under that and you will be okay. If the blade gets too hot to touch with a bare hand, it is still way under the temper temp. Just dip it in water to cool it. Be careful at the edge as heat can build up real fast due to the lack of a material to act as a heat sink.
The angles of the primary grind change as they go round the curve/belly of the blade toward the point.
Work carefully and patiently. Wear safety glasses and ALWAYS be aware of where the edge is: In relationship to your body parts and the contact area of the belt.
Practice on some scrap steel to perfect your gringing technique before attempting your blade.
Grinding is a true skill of the Tool & Die, Machinist trade.
Hope this helps.


Best Regards,

Paul Tsujimoto
Sr Eng
Prod Dev and Qual
KA-BAR Knives
 
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