On 2/20/2011 9:40 PM, Ignoramus17758 wrote:
On 2011-02-21, wrote:
I am trying to make a dog clutch that mates with the knee crank and
replaces the crank handle:
http://igor.chudov.com/projects/Brid...-8057.jpg.html
I wrote a G code program that makes such a clutch from a flat block of
metal, with a 1/8" end mill.
In machinable wax, it does a great job, zips through it, and makes a
surface that mates with the crank handle perfectly, I was very
impressed.
In steel, however, this little 1/8" endmill works for a while, then
breaks after 1/2 hour.
1/8" end mill
4 flute
1 IPM feedrate
2,000 RPM
plenty of coolant
unknown steel, but feels like 1018.
Forgot to say, I always limit the depth of cut to 1/3 of the end mill
diameter.
i
I am sure that something simple and stupid is wrong. I am not really
sure how to approach this.
I will, first, get a known best quality endmill, they are still
somewhat affordable in 1/8". I am thinking, get a 2 flute, 1/8"
endmill, 1/2" DOC. I am thinking TiN coating?
In addition I will get a known 1018 block, I only need a small piece.
I do not want to up the RPM beyond 2,000: at 2k RPM, the spindle is
nice and barely warm to the touch, and at higher RPMs it gets
warmer. Since this is a job that takes forever to complete, I would
prefer to keep the sipndle cool.
Any ideas?
I know that I could make the program run faster with tool changes and
a larger end mill doing boring and such. But I wanted to learn more
about small work.
i
if it breaks after 1/2 hour, that means either that you are doing
something different 1/2 hour into the program, or that it is getting a
little dull - maybe less depth of cut would help it
--
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