Re: [CAD_CAM_EDM_DRO] Re: Looking for a decent milling tutorial

thats and option,

but edm is expensive.

my idea of running the cutter past the corner would allow you to insert a half dia pin to restore the sq corner was used before edm was common practice.

If this is not clear by my desription i'll send a sketch


Nev


David Speck <Dave@...> wrote:
Danny,

You are up against a hard limit of the geometry of a rotating tool.

If you want a cubic square corner, though, there is always the option of
using a sinker EDM cutter.

DAve

dannym@... wrote:

> Ok on milling limitation.
> Now a standard square (ok cube) pocket. A ball mill couldn't cut the sides or corner without leaving a radius. An end mill can cut the side without radius, but not the corner, and that's going to be a radius in a vertical line from the bottom corner where the 3 planes meet up to the top surface. Is there a technique to get around this, or just a hard limit of the technology?
>
> Now the image shown here would seem to have a similar problem:
> http://cadcamtrainer.com/
> There are pockets shaped like a cylinder on its side, like a cutout for a bearing. If we were to drop in a bearing for example the corner where the removed cylinder's side and circular end face meet should not have a radius but an end mill can only cut radius-free on line which stays within a horizontal plane, right?
>
> So we could change to a smalled end mill to reduce the radius, but we can't eliminate it, right?
>
> Thanks,
> Danny

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