Re: Re: Re: Stepper program w/Encoders?

That is the reason I switched to FlashCut. All the critical timing is done in an external unit connected via a serial
interface.

If you are considering USB, take a look at the AnchorChip parts. They are 8051 like with a USB Serial Engine. They also allow
you to download the microcode when the device is attached so code updates are easy. I worked on a product using them about a
year ago.

John

hansw wrote:

> From: hansw <hansw@...>
>
> Bertho,
> You are of course correct... distance it is...
>
> Well I don't care much for Linux, this forum alone is proof enough to
> keep me away from it... perhaps if there was one version, it would be
> tolerable. Yes I have read the arguments for Linux, but it does not make
> sense to punish oneself. That's why I never bothered with OS/2...
>
> As I see it, getting the timing requirements out of the PC and into a
> microcontroller is a far better solution, then the "link" does not
> really mater. I would prefer using USB... does Linux support USB..?
>
> Hans Wedemeyer
>
> Bertho Boman wrote:
>
> > Hi Hans,
> >
> > I do not see a good reason to confuse things with backlash TIME. It
> > is really a DISTANCE that must be added to travel when you
> > change direction on an axis. If you call it time, it must
> > continuously be changed because feed rates vary. It is easy to say
> > that there is 15 mil backlash on Y and 23 mils on X. I think everyone
> > will understand that without any confusion.
> >
> > Oh by the way, take cover and put on a flame proof suit. I can just
> > hear the Linux guys gasping for air.
> >
> > I am hoping for an NT version also so I do not have to go through the
> > headaches of the learning cycle and to maintain an other
> > system. The basic problem is that there must be a real time kernel
> > and the one that I have seen for NT is very expensive.
> > Rumor has it that there is a "free" one available but I have not seen
> > any details. So it looks like I have to bite the bullet
> > and get a Linux system up and running.
> >
> >
> > > From: hansw <hansw@...>
> > > I'm new to CNC also, by dead time I mean the time (= number of turns
> > > needed) to move the tables when reversing direction.. As an example.
> > > If it required (large number for example) 200 turns to move the
> > table in
> > > the opposite direction, it should be possible for the uP to figure
> > this
> > > out, because you mentioned (I think) the use of a DRO as input...
> > > ---------> Snip
> >
> >
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