Re: Drill Speed
hy
hss drill requires torque @ lower rpms, while carbide requires higher rpms
hss feed/revo may be > carbide feed/revo, but because carbide can operate at higher rpms it will achieve a higher linear feed, thus in the end, feed/min will be higher with carbide
you can not compare hss and carbide, for the same tool diameter, at identical rpms, simply because hss and carbide operate at differents rpms, because their cutting speeds are not identical .... in short, hss requires more torque at low rpms, while carbide is the oposite
if you wish to improve stability with carbide, switch to u-drills : their inserts are less $$$, life spam is ok, they will go over missalignments more easy, and they require less spindle torque compared to classical indexable drills
however, there is a catch with u-drills : they do not handle well depths>7D, and the u-drills with inserts with 4 cutting edges do not run as smooth as those with only 2 cutting edges
how does your fixture look ? and what is the depth of the hole ? kindly
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