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-   -   Screaming bit (http://www.camheads.org/showthread.php?t=9998)

BradyWatson 07-02-2019 04:39 PM

Quote:

You're cutting too slow.

You're cutting too fast.

That's just how 1/4" bits sound.

The bit is dull.
You're ALL right at one point or another.

If the design can handle it, swap the 1/4" out for a 3/8" dia. It's 2X the volume of a 1/4" bit with only an 1/8" penalty in kerf width. Makes a huge difference in edge quality on a number of materials & doesn't have the harmonics of a 1/4" tool...and you can run faster if you have the hp. Unless you do something dumb, you'll never snap off a 3/8 solid carbide cutter.

You want 2-flute if you are stuck on 1/4". FYI - 2 flute end mills/upcut spiral are stronger than 4-flute ones because of the cross section. (same w/3-flute) Besides...2-flute is what you want for chip clearance. 4-flute doesn't allow wood chips to flow as freely as a 2-flute. As I mentioned, and your design internal radii can handle it, go with a 3/8. You'll get more meat in the center web of the tool and less or no screaming at comparable speeds. All that 'screaming' telegraphs into the cut...and you don't want to put your name on that.

There are a number of decent 3/8" compression spiral cutters out there that are perfect for what you are doing. Centurion tool comes to mind...and of course Onsrud.

TimPa 07-03-2019 08:05 AM

very enlightening thread, thank you all!

Carbidetooth 07-03-2019 09:59 AM

Quote:

Originally Posted by BradyWatson (Post 81531)
Unless you do something dumb, you'll never snap off a 3/8 solid carbide cutter.

You mean like forgetting to turn spindle power on?
Right out of the chute, first time cutting panels, first time using compresssion bit. Was kinda nervous, dust shoe concealed bit. Drove it right into table...tink! Lesson learned.

Jim Becker 07-03-2019 10:09 AM

Quote:

Originally Posted by Carbidetooth (Post 81541)
You mean like forgetting to turn spindle power on?
Right out of the chute, first time cutting panels, first time using compresssion bit. Was kinda nervous, dust shoe concealed bit. Drove it right into table...tink! Lesson learned.

https://qaf05a.sn.files.1drv.com/y4m...&cropmode=none

drummerjg 07-03-2019 10:56 AM

Quote:

Originally Posted by Carbidetooth (Post 81541)
You mean like forgetting to turn spindle power on?
Right out of the chute, first time cutting panels, first time using compresssion bit. Was kinda nervous, dust shoe concealed bit. Drove it right into table...tink! Lesson learned.

Experience.....what we get when we didn't get what we originally wanted!

Been there...dumb that [lol]

TimPa 07-03-2019 01:33 PM

i already have learned 2 "bit lessons" (i hope they are still making lots of bits!!!).

this is why i don't play golf, they don't make enough golf balls! that and i am really bad![embar]

Clayton.Lott 07-03-2019 07:32 PM

So glad for all this helpful knowledge since I'm a newby, however I will add that cutting conventional instead of climb made all the difference I was looking for. And yes I felt like an idiot when I realized what I had been doing. This forum has already been worth the price of admission.

BradyWatson 07-03-2019 08:20 PM

Quote:

Originally Posted by Clayton.Lott (Post 81556)
So glad for all this helpful knowledge since I'm a newby, however I will add that cutting conventional instead of climb made all the difference I was looking for. And yes I felt like an idiot when I realized what I had been doing. This forum has already been worth the price of admission.

"Don't throw away your best edge."

Meaning...if the scrap looks better than the part, reverse cutting direction.

Your powers of observation at the tool when your mind is on the work and not the phone/FacePlant or other distractions - is precisely what separates the pros from the shmoes. If you take any advice, let it be to observe and think about cause and effect at the machine. All will be revealed if you're quiet enough to listen.

SteveNelson46 07-03-2019 08:43 PM

Not me! I've never broken a bit. And if you believe that you'll believe there'll be a Richard Simmons Jr.

drummerjg 07-03-2019 09:26 PM

Quote:

Originally Posted by SteveNelson46 (Post 81559)
Not me! I've never broken a bit. And if you believe that you'll believe there'll be a Richard Simmons Jr.

Now that is just plain hilarious! Thanks for a good laugh.


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