RE: [CAD_CAM_EDM_DRO] Re: Big servo motors drive recommendations

I am going to have to have a play with this at some time.
Your confidence and success with it is good.

With the university guys you get the feeling they spend all day playing,
aren't really serious or professional at any of it, they had loads on
research money to play all day. When something didn't work I tend to think
the blame had to be thrown somewhere and probably since the people supplying
the grant money knew windows could be blamed, perhaps throwing blame on
Linux and EMC was an accepted excuse. I'm not even sure what they were using
EMC for the research project was over the horizon radar for mod an and space
defence.

Perhaps Linux and EMC took the brunt it didn't deserve.
I still sometimes feel though it sounds more amateurish than our DIY mach,
but really I am not qualified to judge until I've tried it, so am going to
have to have a go at some stage.

I do have windows servers though that run around the clock without fault.
The only time they are shut down is during lightening storms. But I do not
trust windows for critical systems. We designed the steering on the world
biggest single masted yacht, against our recommendation the handover between
steering stations was set up to run by a PC based windows control called
Praxis. This had the habit of failing leaving no electrical steering in the
most dangerous places. That was why I recently went to Italy, they finally
let me override the Praxis PC.

Regs Mark

Dr. Mark Vaughan Ph'D. B.Eng. M0VAU
Managing Director
Vaughan Industries Ltd, reg in UK no 2561068
Water Care Technology Ltd, reg in UK no 4129351
Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288
RSGB DRM111(Cornwall)
-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jon Elson
Sent: 29 May 2007 05:28
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: Big servo motors drive recommendations

Mark Vaughan wrote:

>
> As to EMC2, I have spent a long time getting all the rest of the machine
> configured to work with Mach, I don't really want to get into another
> package, I also have a massive array of programs prewritten for mach.
>
> I have friends at University, research colleagues that use linux and some

of

> them EMC a lot, their initial presentation is that it's brilliantly

stable,

> never falls over unlike windows, just what you want to hear, then you get

to

> hear about the inefficiencies, the bugs etc etc., and you really wonder
> whether it is just having to learn something else full of bugs. I know

mach

> and I like it.

Well, there are plenty of bugs in the development version of
EMC, but they usually last no longer than 2 weeks from discovery
to fix. But, the stable versions made for distribution rarely
have anything serious.

As for stability, EMC has been unmatched. I use it to produce
instrument panels, housings, etc. for my products. I have been
using it since 1998, and have not had one crash, failure,
malfunction, etc. since early 1999. So, that is over 8 years,
now! I do not run the development version on my production mill
because I'd like someone else to find any bugs first, and I have
real work to do. (I do run the development version on my
minimill, but that machine is for testing and demo purposes.)

So, 8 years without a SINGLE crash! Yes, there might be some
things that could be documented a little better, we are always
working on improving that. Inefficiencies? I don't know what
you mean by that. Inefficient execution of code on the CPU?
Inefficient motion planning? I think not! (Yes, there were
some problems with the trajectory planner on EMC1 when run above
400 IPM, but I believe we have corrected that in EMC2. I don't
have a machine tool that is fast enough to ever see the difference.)

As for Mach programs, the interpreters are very similar (Mach
started with the EMC G-code interpreter) so your Mach programs
will likely run with little or no changes in EMC.

As for OS reliability, I routinely have my Linux systems run 70+
days, and my desktop Linux machine at work ran over 400 days
before a power failure got it. My power at home is much less
reliable, but the machine I'm writing this email from has been
up 59 days so far.

Jon
Jon


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