Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: turbothis on March 20, 2012, 04:15:31 PM
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i just got a sabre 750 and are planning on going the mach route on it. it came with the acramatic 850sx controller but i am selling it all off to pay for the iron.
1 are the brushless (i assume ac) motors on the mill now going to be costly to make step/direction run?
specs are z axis
(http://img32.imageshack.us/img32/1254/img0484qj.jpg)
and i assume both x and y are
(http://img857.imageshack.us/img857/6392/img0483n.jpg)
this came with some bds4's that i think are the drives?
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if i cant use the motors i will just sell them off too.
i was thinking maybe the biggest keling servos would be enough. not looking for speed on this mill, just rigid,accurate and toolchanger.
it has no spindle motor and i think i might be about to get a 5-10hp on there later.
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Personally I would try my hardest to keep the AC servos rather than go with hobby grade drives/motors. You have a few options if the drives are analogue input and are ok
Galil, DSPMC, KFlop/Kanalog or CSMIO/IP-A are 4 types of controllers that work with Mach and output analogue signals.
Hood
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what kind of power supply can i use? i am out of my garage and have only good amp 220 service.
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What model BDS ?
BTW they are Brushless DC drives.
Hood
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looks like bds4206 23412w32
thanks on the dc!
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Seems they require a 250 to 360vdc suply so your 220v should be fine once transfomed and rectified. Is there a power supply in it already?
Hood
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in the drivers?
this is all i got other than a couple little transformers and what look like small breakers or relays.
http://www.ebay.com/itm/170808712652?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
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Were the drives the ones that were matched to the motors?
Hood
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ah ok I see that is what you are selling.
If there is no big power supply then you would need to make one as it seems the drives are DC input. As you do not need to step the voltage down you could just rectify and smooth I suppose so no transformer needed.
Hood
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so rectify and see what i get? how do i smooth it out?
thanks as always!
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When you rectify and smooth AC you will get approx 1.4 times DC out.
You use capacitors to smooth the rectified voltage, think usually they reckon about 2000uF per amp.
Looking again at your motors however you may need a transformer as they are 230v so if using your mains direct that would give you 308vdc which may be too high. It will depend if the drives can limit the voltage put out, you would have to read the manual to see if thats the case. I would imagine they would but better check ;)
Hood
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how do i look for a transformer to get me down in voltage?
this is new tech to me. i can do geckos but thats about it....
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Most transformers are used to drop voltage but you can also use them to increase if needed. Anyway best check the manual for the drives. I saw they take 250 to 350 dc so I would presume they can be set to limit voltage out to the motor even if input voltage is higher than you require but maybe not.
Hood
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hhmmmmm....
i guess i will see if i can find some info on these as i do not have a manual.
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I just googled for BDS4 drives and got the manual.
Hood
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so i got a new 7.5hp (20A) 3ph motor for this thing and are exploring my options.
i am wondering if this will run it....
http://www.a-m-c.com/download/datasheet/b30a40ac.pdf
i am planning on getting the kflop boards too