Re: Re:EHP External Hardware Proposal

Steve,
That was interesting... The SimpleStep has a driver for the stepper but they cannot do CNC g-code
form the FAQ

Q. Do you have a CNC program to run your Simple Step� Boards?
A. Currently we do not have a program that will create G or M codes and translate them into Simple Step� commands. This is
being worked on however, but we do not expect a release of any software until the second quarter of 2000. It may turn out that
any first attempt of a software release may be for the Mac.

They are also running the RS-232 in parallel, but I notice they are only using 57600 Baud, I expect this is because of the slew
rate limiting due to the excessive loading of the RS232 line... Although the claim "Magna is using a new RS232 interface chip
that allows us to parallel the RxD and TxD lines." I would be interested to see who make this chip.
However, it is easy to parallel RxD and Txd using ordinary interface chips, I do it often enough for debugging, but the errors
increase and I have to drop Baud rate... I suspect Simple Step will have a distance problem with that RS232 arrangement !

Anyway it's close, but it has a driver, I want to use existing hardware, no need to make people buy new motor drivers...

Thanks
hansw


Steve Carlisle wrote:

> From: "Steve Carlisle" <quatsein@...>
>
> And here is another board along similar lines,
>
> http://www.simplestep.com/ssxyqe.html
>
> Steve
>
> ----------
> From: William Scalione <scalione@...>
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO]Re:EHP External Hardware Proposal
> Date: Tuesday, February 01, 2000 8:31 PM
>
> From: William Scalione <scalione@...>
>
> To all interested in the external hardware for stepper/servo control;
>
> I have been using a stepper controller that I got from
> http://www.eggertelectronics.com/
> quite a while ago. It uses RS232 port, controlls 3 axis', lots of I/O,
> and is somewhat smart.
> Uses an 87C51 embedded controller, has amps on board. cost about
> $100.00.
>
> Simply send number of steps, speed, and direction to the controller and
> it does the rest. Poll
> the port for the finished moving flag and you know when it is done. I am
> a really really bad
> programmer, but even I wrote something halfway decent for it. I use it
> on a old CNC lathe that
> is now manual CNC only with no taper cutting (see below)
>
> I am NOT suggesting that we use this board, because it has some definite
> problems. First It can't
> be used as a cnc control because it uses integers in its calculations so
> while a X10 Y5 move is
> possible (2 to 1 ratio) an X10 Y3 (3.3333333 to 1 ratio) is not
> possible. Also it is a R/L drive
> which I'm sure nobody wants.
>
> I only bring this up on the chance you guys may get some ideas from
> looking at the commands
> required to control it, which are posted on his web site. He did mention
> that he was working
> on another board which will fix integer and R/L problems mentioned.
>
> Bill
>
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