Re: Acceleration rates..

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "leslie watts" <leswatts@a...>
wrote:

>
> Just a few words on acceleration rates...a different perpective...
>
> Consider when you want to pass through a corner without stopping.
> That corner will be rounded to a particular radius, and that radius
> will be the square of the end effector speed divided by the accel.
>
> An example might be a cnc router going at a path rate of 4 inches per
> second.
> Let's say you have available 0.1g. That is about 38 inches /sec^2.
>
> The minimum radius at that speed is simply 4*4/38=0.42 in!
>
> At 1 inch per second speed the radius would be 1*1/38= 0.026 in.
>
> Obviously you need to slow down in sharp corners, but there is a limit
> to that depending on chip load and burning.
>
> Take the lowest speed you can cut without burning and the sharpest

corner

> you need to do. The accel required is that speed squared divided by the
> radius.
>
> Les

I thought about the sharp corner thing and had the idea one could pass
the corner and do a circle and hit if from the perpendicular. it
would waste material, but offer a sharp corner.

Dave