Re: controlling feedrate in tight corners.
hy reg 3x/300% may seem a large range, but if process is stable, then there is no issue
thus process stability and cutting specs range/variation are not corelated, thus there is no limit above which the process becomess unstable
thus cutting specs variation, subjective interpreted as big, may not be a major destabilization factor
peripheral vs core differnce is most relevant in application like a helix with a T mill, because tool is relative fragile in comparison to a normal end mill; if someone programed many normal mills, and suddenly encounters a T mill, then he may overload/break it, this is why this type of helix application is associated with recomandatioon for considering peripheral vs core
this aproach makes sense as long as side contact is < radius; the T helix example is meaningfull, but is not the only scenario for such a consideration
round slots, are under the category of toolpath with variable curvature, and most cams aproach begins with consideration of initial constant stock, to which it aplies of calculus or arch/peripheralengagement; for example, at corner, the contact length, among tool periphery, increases sudenly, only for a fraction
this can be treated differently, like reducing specs, or plunging the tool before starting the contouring operation
for a simple slot, the strategy can be g-code written, thus used a parametric aporach optimized for your machine
for more complex toolpaths, like hsm, etc, more things are to be taken into account / kindly
Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg