Just thanks...
....if someone like to try AND learn then DIY boards are cheap.
Otherwise... you already write...
...thanks nice letter.
2010/9/18 Jonathan George <geo01...@gmail.com>
>
>
>>
>> HEY......
>>
>> That's not nice!....
>> I know that developing take time...
>> But EMC programmers doesn't charge for many hours they 'wasted'. ... and
>> support and... ... ..
>> If you have enougth money to buy $7000 machine then there is stupid
>> think to save $97 here...
>> But if you check what is most popular EMC2 usage then you (surprising)
>> find out that the most is used on small bench mill's. And I think that
>> mill's are homemade build and they are cheap. And over that $97 can be
>> big amount to pay.
>> So there are many builder wanted to make personal small mill with at low
>> budget. If there are someone that start to earn money with own CNC then
>> they soon realize that 'old one' is to slow, to unpresise, wear so
>> fast.... and wil make or buy better one.
>> So please make difference betwen hobby users and serious biznis use. The
>> only EMC2 is cheap (free) for both.
>>
>> And I didn't say that Hardware need to be free! Just some PROVEN
>> schematic.
>> As I find no good EPP expander I just drawing one and wan't to do that.
>> And schematic will be free.
>>
>>
>>
>> ... and I live in Earth. (still :D)
>>
>>
>
> So I use EMC for hobby stuff here at home. I have also used EMC for
> business use in R&D machines and I have been very happy with it. When I
> first stared using EMC when I was a freshman in college I didn't want to
> spend any money buying other people's hardware, I just wanted to make my own
> to "save money".
>
> The first machine that I made was a servo machine so I made a
> step/direction input closed loop servo controller from scratch using FETS
> and an AVR microcontroller. At the time I thought that I was saving money by
> making my own board because the parts for each board (single axis) only cost
> like $17 or something like that. But I had a 4 axis machine so just
> hardware cost my like $68 and the quality of my board was not that great.
>
> Then lets consider how much time I spent neglecting my engineering homework
> to build the boards, I think it had to be more that 10 hours for each board,
> lets say that I don't value my hobby time much and it is only worth about $2
> and hour (I value my hobby time much more than that now). So it cost me
> about $80 of my time as a very conservative estimate (How much did I spend
> on tuition that semester? and I'm neglecting my homework). So now I'm into
> this project $143 and it works ok but feels very home grown. And after all
> this doesn't include all the equipment that I purchased to make the boards
> for the original development board. I spent lots of time hooking a serial
> cable up to my servo drives to tune them through a TTY interface.
>
> Lets fast forward to a couple of years ago. At this time I was a graduate
> student and still broke. I was building a new machine and thought that I
> could save some time by purchasing some off the self components. I never
> really analyzed the cost of hardware on my previous project, I just thought
> that I could make the hardware for so much less than buying it. I discovered
> the 7i43 ($79) and the 7i30-4($89) boards from Mesa Electronics. So for
> $168 I purchased an off the shelf 4 axis closed loop servo system with 24
> additional I/O points. I couldn't believe how affordable this solution was.
> I was even more blown away after I got the boards and stared using them. I
> hooked the boards up to my old machine and I couldn't believe the improved
> performance over my DIY drivers. For any new machine I make, hobby or work,
> I will use off the self hardware to save time and money.
>
> Now if I had could go back and do it all again I would still make my own
> hardware the first time because I learned so very much from doing it but I
> have to admit that I wouldn't have saved any money. So if your argument is
> about saving DIYers money then forget about it, because in my experience it
> open source boards don't do that. However I agree that you learn a whole lot
> from building your own hardware.
>
> I would suggest that people who are trying to just bodge together a quick
> low cost machine just use stepper motors and the parallel port. If you need
> more I/O points then add a PCI parallel port card to your computer (I know
> that requires you to have used a computer with open expansion ports, one
> reason why I would never use a laptop for EMC). Another option for
> non-real-time I/O and functions is to use and Arduino board connected to the
> USB port. Take a look at http://axis.unpy.net/01198525592. That whole
> solution is completely open source and you can do what ever you want with
> it, it will be fast, but just not hard RT.
>
> If you want to build some hardware just for the fun of it and to learn
> something then I suggest looking at the wiki here:0
> http://wiki.linuxcnc.org/emcinfo.pl?EMC2_Supported_Hardware under the
> heading "DIY hardware known to work with EMC". There you will find some info
> on the Pluto FPGA setup, an opensource FPGA based solution for EMC. You
> should be able to build your own board with the info from that project, but
> I wouldn't suggest doing that if you don't have lots of time and money to
> trow at it. If you end up doing that please share your results.
>
> But as far as the parallel port expander goes, the most common solution is
> simply to add another parallel port to that machine. If you don't have an
> expansion port in you computer you may want to reconsider you choice of what
> computer to use. Please consider that a parallel port expander would require
> an new driver to be written and maintained. The driver is problably a much
> bigger challenge that the expansion board.
>
> Sorry if you have made it is far sorry that I have rambled on forever on a
> list that I don't really have any business posting on. I have probably
> violated some written and unwritten rules of the list, sorry for my
> ignorance.
>
> Slavko good luck with your project.
>
>
>
>
>
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