i need help ,,well a loot of help
- cvrkan
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09 Feb 2019 12:22 #126054
by cvrkan
i need help ,,well a loot of help was created 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
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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- tommylight
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09 Feb 2019 19:33 #126073
by tommylight
Replied by tommylight on topic i need help ,,well a loot of help
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 !
Bog stari !
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09 Feb 2019 20:01 #126078
by cvrkan
Replied by cvrkan on topic i need help ,,well a loot of help
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09 Feb 2019 20:12 #126082
by tommylight
Replied by tommylight on topic i need help ,,well a loot of help
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- Clive S
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09 Feb 2019 20:20 #126086
by Clive S
That's the one brill.
Replied by Clive S on topic i need help ,,well a loot of help
store.mesanet.com/index.php?route=produc...oduct&product_id=311
this one ?
poz
That's the one brill.
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09 Feb 2019 21:55 #126102
by cvrkan
Replied by cvrkan on topic i need help ,,well a loot of help
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 ?
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
Replied by tommylight on topic i need help ,,well a loot of help
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.
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
Replied by cvrkan on topic i need help ,,well a loot of help
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
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
Replied by tommylight on topic i need help ,,well a loot of help
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,
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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