Re: [CAD_CAM_EDM_DRO] Question No. 2

sutherland_oz@... wrote:

> Hi all, Do all cnc programs have provision for closed loop feedback
> from encoders?

No, most steper motor type programs do not have this feature.

> as I guess this takes care of missing steps. I'm
> planning to build a small mill to cut clock plates & cross out clock
> wheels, I expect the available table force to be in the region of 200
> lbs., this is more than enough to break any end mills that I will be
> using, so maybe missing steps won,t be an issue. (Adding encoders is
> obviously a lot of work if the general opinion is that open loop will
> be O.K.) Thanks in advance for any comments, as always they will be
> valued & greatly appreciated. Ian Sutherland.

I designed around 1000 Lbs linear force at the machine table, but
maybe my machine is bigger, too. Don't forget the acceleration needed
to meet speed demands of the CNC program requires additional force.

Jon