i need help ,,well a loot of help

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09 Feb 2019 12:22 #126054 by cvrkan
i live in croatia that is in europe
and my plan is to buy bf20L mill and turn her to cnc
for now i got some plans for mounts for mod
www.thingiverse.com/thing:2747772 --just will make parts in alu

drivers motors
www.ebay.com/itm/DE-Ship-3axis-Nema34-st...wGDZbW8lP:rk:10:pf:0

BF20 ball screw cnc conversion kit
www.ebay.com/itm/BF20-ball-screw-cnc-con...047675.c100752.m1982

i want to use linuxcnc for software part
got spare pc with 240gb ssd and lcd ..

now controll part is huh to me

can u suggest something with ethernet connection but cheap
i was looking to get some of these mesa cards (7i92 i think is one with parallel for bob)
www.shop.cncmonster.de/LinuxCNC/FPGA-Kar...net:::84_94_125.html
and connect that mesa to bob i got in that nema34 kit ,,,,to be cheaper

but what i know

so can u help me with all this if u can ?
thanks

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09 Feb 2019 19:33 #126073 by tommylight
7i92 is very nice, but in your case you might want to get the 7i96 so you can also have spindle control and much easier wiring.
Bog stari !
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09 Feb 2019 20:01 #126078 by cvrkan

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09 Feb 2019 20:12 #126082 by tommylight
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09 Feb 2019 20:20 #126086 by Clive S
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09 Feb 2019 21:55 #126102 by cvrkan
ok thanks for help
it will be bob to mesa 7i96 for controll part
only part now i worried
will these nema 34 be too slow for x y axis ?
i read couple time that ppl have problems with nema 34 and dm860a drivers
like too slow or sluggish moves
and explanation was big motor is slow vs smaller

but i dont know will that be same for bigger mill that need to push 750mm table and part+vice on it over y and x axis
will this be too slow ?

or i just over thinking again ?

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09 Feb 2019 23:35 #126108 by tommylight
No BOB. 7i96 has everything you need and it can be expanded further with Mesa boards for inputs, outputs, or even more stepgens, and if you are feeling lucky even add a 7i77 to control servo motors and drives with analogue inputs.
As for sluggish, that will depend on what you intend to do with it, but for normal use it will be plenty.
The problem with the DM860 is that it is rated at 7.8A, but Peak, not RMS as they should be, so they do get to around 5A, and that is also plenty for what you need. You should get at least 2m/minute rapid speeds with a 5mm ball screw, most probably even 5m/minute with some fine tuning.
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10 Feb 2019 03:48 #126122 by cvrkan
aah
so i can just plug 3 drivers to 7i96
i find only video how to wire driver to mesa 7i76
just to find step generators and goes - 5vcd no and dir + ,dir -,step+,step- and left out is ground like last pin
that go to pul + - and dir +- in driver side
where to connect switch limiters ?
or how to get control of mill speed or i do that manually ?
i read manual but without picture of wiring i'm lost :)

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10 Feb 2019 12:54 #126143 by tommylight
No need for ground IF using differential signalling.
7i96 has everything needed to control the spindle and feedback, but you do need a drive for that spindle or a VFD, so you can control the speed from Linuxcnc,

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