hy general infos for cbn :
... radius 0.4mm, 080-180M/min, 0.05-0.35mm/revo , doc0.38mm ( avoid doc>0.5 )
... radius 0.8mm, 100-300M/min, same as above
* target lower values
if you wish, please share :
... material/steel type
... hrc after heat-treat
... drawing before & after heat-treat ( and please highlight the places where hrc is being tested )
... cutting specs ( rpm, feed, doc )
... also, maybe these ( is not a must, maybe you have time ) :
...... actuall tools
...... a photo with the setup will help ( so to check the fixture, the atmosphere, etc )
how much is that in mm ?These parts need about 8 grand for depth and bore on the ID
i guess that by "bore on the id" you mean to increase the diameter, thus X axis
by "depth" do you mean depth-of-cut among X axis ( radial, or diameter ), or do you mean Z axis ( is there a blind hole ) ?
i need to understand where is located the material that has to bee removed, and also if there are shoulders, and if yes, i need to know how you attack those shoulders i also need to know where did you broked your insert ... did it breaked because of cutting forces, or because of chips hanging arround ? it may be possible that insert got weaken when cutting the face, or when entering the cut, because material was not uniform, thus the 1st cut, that "cleans" the surface, has a higher chance to break your insert
please excuse me if it seems that i am asking for too much info, but cbn inserts don't fall from the sky
with a bit of luck, maybe hi-quality carbide will work 4 you, and that is less $$$, compared to cbn inserts ( if it heps, i have delivered a setup in 41Cr4, 45-48hrc, that lasted a few months, changing tools 1-3 times/week, with coolant; i also used cbn in 60hrc, without coolant )
if feel like it, please write a small motivational story, about how an expensive thing can also be a poor thing if you wish, i will do it too ... no kiddingI broke my poor insert and don't want to break another expensive insert.
if you wish to avoid the risk of breaking, then cut only air / kindlyWhat would you say is a good amount to take off at a time without the risk of breaking my insert?