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Posted by Bipolar Bear on February 4, 2009, 9:52 pm
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> Hi all
>
> For endmills such as
>
> http://www.maford.com/pdf/Metric XR 07.pdf
>
> (177 series) which are 4 flute and centre cutting (as I understand it) why
> is there no capability of simple Z plunge 'drilling'? Or ramping at
greater
> than 7 degrees?
>
It will clog at the gashes because during a straight z axis plunge you are
generating a ribbon-shaped chip and routing it almost directly upwards into
a sharp-cornered dead-ended gullet area.
Better is to use a 2 flute and radius the gash as shown here:
http://tinyurl.com/cnfer9
Where possible, blending a raduised gash into an exagerated secondary axial
end clearance provides the best roll-out action on straight plunge.
>
> And if I'm to circular interpolate at 7 degree ramp is it only necessary
to
> consider the circumference-path traced out by the tool centre and the Z
> depth per revolution ..... or is it more complicated than that ? :)
>
Ideally where ramping a helical path I like the hole to be larger than the
tool by at least 1x the tool radius but YMMV
--
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>
> For endmills such as
>
> http://www.maford.com/pdf/Metric XR 07.pdf
>
> (177 series) which are 4 flute and centre cutting (as I understand it) why
> is there no capability of simple Z plunge 'drilling'? Or ramping at