Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Electronic Lead Screw & Power Cross Feed | Poor Man''s CNC ?

Ron,
Thanks for the clarification. I can't understand just HOW that works but if
you say so....
So what the interface is, basicly, is a breakoutboard that splits the
encoder signals between Mach3 and (if it's a servo system) the drive. + aux
relays. It's the macropump script that does the work.

I once did a spindle RPM sensor and interfaced that to Mach3. Then, with the
macropump I monitored the speed and shut down the machine if it was below a
certain speed for more than 5 samples. I could not get that to work beyond
~10kHz with Mach running @25kHz. That's why I'm so curious about this.....

Thanks again.
/Henrik Olsson.

----- Original Message -----
From: "R Rogers" <rogersmach@...>


> Hi Henrik,
>
> Read that from a few people.... Mach is doing all the counting out and
> in as far as I know. The axis will stall at almost 160 ipm, right where
> the voltage calculation-limitation of the drive dictated that it would.
> Don't have an explanation of how it can do this in regard to speed but, it
> does it. When first started using encoder counts to monitor position, the
> concern was timing constraints. Now they aren't given much attention after
> three machines have exceeded the 22.5k mark without any issues.
>
> The Jet has those folding handcranks on it, in rapid they are a blur (700
> rpm). Thanks for the compliment on the machine.
>
> After using the interface, for close to a year now, I wouldn't want a
> machine without it. It has saved so many workpieces. Some big UHMW details
> (2X6X20) I was running on one of the Bridgeports a few weeks back. Very
> complex 3D surface and about 8 hours into the job, the X gib on the old
> Bridgeport got free of the adjusting screw and totally locked the X
> axis(fixed it). Normally Y and Z would have continued on and destroyed the
> part (80 ipm feed). The following error of .004" was exceeded and the
> interface stopped the machine. Saving the part.
>
> Ron
>
> Jon, Those are very impressive numbers. Thats a nice system you have.