The beauty of high speed machining

[boltfluter]

Thought you guys might enjoy a couple of barrels fluted with some new coating technology that I am trying out. These are machined dry at 2750 rpm and 15 inches per minute. Straight off the machine with no polishing at all. Very impressive inserts in my opinion. 8 flutes on the barrels. Normal tooling is run at 538 rpm and 6 inches per minute. Enjoy.

Regards,Paul

www.boltfluting.com

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[URL=http://s1241.photobucket.com/user/boltfluting/media/PPR%20PICS%20406_zpsq9mfahkt.jpg.html][/URL]

 

[jonbearman]

What about heat dissipation? They look awesome.

 

[boltfluter]

Hey Jon,

Great question. Based on rpm and feed rate 95% of the heat is transferred to the chip. Chips come off blue and are quite warm. Once the insert and coating reach 1350 deg. F it is self lubricating. The barrel is only warm to the touch. Somebody has their thinking cap on.

 

[yukonal]

Looks cool Paul. I'd like to see it in person.

Sending a customer your way for bolt fluting. Maybe a new handle too.

 

[Jefferson]

That is impressive

Just wish you were in Canada

Jefferson

 

[chalkeye]

I'd love to see a video of this in action!

 

[boltfluter]

Looks cool Paul. I'd like to see it in person.

Sending a customer your way for bolt fluting. Maybe a new handle too.

yukonal,

Thanks very much.
Paul

 

[MrMajestic]

Nice Paul! The great technology race has been going on since my start in the '70's. Tooling and Machine tools. 1000 psi coolant is another biggie in chip management.

 

[Preacher]

Right good job!!!!!!!!!

 

[ireload2]

But how crooked are the barrels now?

 

[BigBlueandGoldie]

here we go again.......

 

[Rustystud]

I run flood coolant lubricant on both my barrels and tooling. The barrels never get much over room temperature. I make two passes the first is a plunge the second only takes off about .010" and leaves a great finish. The plunge cut is running 230 RPMs with a 2.5" carbide cutter at about 1.0" per minute. The second pass is running about 6." per minute. I do opposing side cuts alternately. Has not had any effect on accuracy.

 

[mac86951]

Looks nice. Careful you don't hit the friction stir welding speeds/feeds

:-D

 

[boltfluter]

I run flood coolant lubricant on both my barrels and tooling. The barrels never get much over room temperature. I make two passes the first is a plunge the second only takes off about .010" and leaves a great finish. The plunge cut is running 230 RPMs with a 2.5" carbide cutter at about 1.0" per minute. The second pass is running about 6." per minute. I do opposing side cuts alternately. Has not had any effect on accuracy.

Exactly. Every cut has an opposing cut done at 180 deg. Barrels were polished after fluting and ran true. Just like every other barrel I have fluted. The secret is to make the cuts 180 deg. apart as Rustystud does. Never had a barrel returned for an accuracy problem in 5 yrs of fluting them, so I must be doing something right.

Regards,Paul

www.boltfluting.com

 

[boltfluter]

Looks nice. Careful you don't hit the friction stir welding speeds/feeds

:-D

Good point. But, these feeds and speeds are what was recommended by the manufacturer. Actually they said faster, I just don't have the b@#$s to do it. LOL.

Paul

 

[MrMajestic]

Paul, I stood in front of a lathe that was turning the OD of a Harpon Missile engine case at .400" depth of cut, .06" per rev! Sounded like someone was inside shooting a .22LR at the window!

 

[mac86951]

Paul, I stood in front of a lathe that was turning the OD of a Harpon Missile engine case at .400" depth of cut, .06" per rev! Sounded like someone was inside shooting a .22LR at the window!

If the chips aren't blue, go faster, or you're cutting the wrong metal...