Re: [CAD_CAM_EDM_DRO] Re: Re: Belt vs. Direct Drive

jwalters wrote:

>Climb Milling, the most misunderstood term for the home shop
>machinist. The reason to use climb milling is simple, it leaves
>a much smoother finish on most materials, especially aluminum,
>than conventional milling. With care I regularly use climb milling
>on my 20 year old Sherline mill. For practice, bolt a piece of
>aluminum plate to the table, yes make sure it is tightly attached to
>the table. With a 3/8 spiral end mil, take a .005 deep pass using
>a conventional mill pass to size up the setup. Now preload the
>'X' axis lead screw with one hand by pushing against the end of the
>table opposite the direction the table is fed. Without the cutter
>engaged in a cut, move the table in .002. Now by preloading the
>lead screw, take a light climb mill cut and notice the improvement in
>finish.
>On my larger mill-drill machine I can take a light pass without
>preloading the lead screw. The essentials are straight forward,
>a good tight setup, sharp tools, close attention, do not get in a hurry
>and practice. Now when edge milling on either machine I take
>passes in both directions to save cranking time and always finish
>with a light climb mill pass. Yes if climb milling is done incorrectly
>problems will occur, proceed with caution.
>John
>
>

This may not translate easily to your small machines but I'll try to
make it simple , yes what was mentioned is ( climb milling ) but what I
think was being mentioned earlier was more like this :
On a Bridgeport take a 1" 2 flute endemic set the rpm to about 3,000
feed rate about 20 IPM,put a SLIGHT drag on the table with the lock ,
depth of cut about 1", width of cut .75" ( now this is the critical
part if you wimp out and take less than .5" the cutter will suck the
part and the whole table into the cut ** read broken end mill and part**
) the reason this works is because you are taking a cut well over half
of the width of the end mill so the material on the one side must be
pushed while the material on the other side is pulling onto the cutter ,
this will almost self feed at the right setting .
-I LOVE TO HOG MATERIAL- I can do this and make it RAIN on the whole
shop and it sounds like a router .

Make CHIPS
Ron K

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