Messages

51

General Mach Discussion / Re: Toroidal transformers vs standard IE

« on: March 30, 2008, 04:44:51 PM »

Thanks, Guys
To answer your question on why I ask is really simple: To get a feel of the territory I'm about to enter.
I a firm believer that sometimes people shouldn't be afaraid to get into something that they don't know a lot about.
Just Do It.
I have found out a few things in this forum:
1) It's amazing how much information there is out there.
2) It's also amazing how differently people see things.
All can be right. They just have a different route in getting there.
I used to design and build machinery for the PVC pipe industry.
So when someone tells me to boost the voltage for a DC motor; well I really need to investigate that.
For instance try taking one of you small dc computer fans and hooking it up to your car battery!
What's the outcome... A real fast hairdryer that melts.
I have tried to pull up info from everyone and everywhere to get an idea on how I'm going to persue this.
I think I now have enough to go on.
Thanks, to all of you.
Also, when I talk to the mfg. of the items in question, they all tell me just bits of info and frankly what they said and what
you guys had said in the past posts were kind of conflicting.
So I just felt I'd ask the people that actually use the stuff not design it.
As a designer and "engineer of sorts" I have learned 1 solid fact.
That is.
I hate most Designers, Engineers, Salesmen, and architect
The reason,
They never work with the stuff they design and manufacture.
All the products I've designed and built I actually had to work on or with everyday.
So the info I get from you guys is golden.
Thanks again,
Brian
KNS Supply

52

General Mach Discussion / Re: Toroidal transformers vs standard IE

« on: March 30, 2008, 06:33:54 AM »

Thanks Sam,
I think what I'm going to do is what I have always done and that's just build the freakin' thing
with what I've got and see what happens.
the last machine i built was holding great tolerances +/-.0001 with no problem turning 316 stainless
this one will machine aluminium in a 8" x 10"  table
I built the x - y table and it's tight. so I'm just going to build it and go from there.
Gut feeling, I think since the machine will travel at slow speeds I don't think I'm going to have a problem.
Like I said the last one I had powermax II single stack motors and tool pressure wasn't a problem and speed wasn't either
again motors were rated for 35vdc And I ran them on a 24vdc ps the only problem was speed when micro stepping.
and I think that won't be an issue here cutting 10- 20 or even 30 ipm .375-.500" deep in 6061 or 2024
I'm going to try it.
I think that the 4.5vdc motor will fail prematurely due to the excess voltage.

Thanks,
Brian

53

General Mach Discussion / Re: Toroidal transformers vs standard IE

« on: March 30, 2008, 01:23:42 AM »

I don't know. I think that the system I built before had 2 nema 23 pacsci powermax II motors that were rated for
35vdc and I ran them on a 24vdc power supply.
end result, they ran great for what I needed slow speed an a lot of torque.
I think that everyone input is great, but in plain English I don't understand why
if the plate on the motor states for an E33 sigmax motor 665 oz-in 65VDC 5.4
why this motor would not give me my 665 oz-in or close to it when using a 56vdc power supply
Max rpm on this machine is going to be 180-200 rpm
?should this work yes or no.
?the other motor e33 sigmax  996oz-in  4.5vdc 8.4amps
same max rpm 180-200.
will these work with a 56vdc 800 watt power supply
yes or no.
? what should I expect to see when powered up an I make a first move.
they are 1500 rpm motors.
I think I have a large motor for what I need but this is what we have.
and I would like to use them.
It seemed to work on the other system I built, the only thing with that was the top end speed
was not there.
Anyway just thought I'd ask.
My brain is fried after working 16hrs a day
thanks,
Brian

54

General Mach Discussion / Re: Toroidal transformers vs standard IE

« on: March 28, 2008, 11:31:49 PM »

also both are bipolar parallel motors

55

General Mach Discussion / Re: Toroidal transformers vs standard IE

« on: March 28, 2008, 11:30:07 PM »

Well it depends on what you want to use the motor for, "torque needed at high rpm or torque needed at low rpm"
My application requires rapids at only 10-12 rpm per sec max.
cutting at 30ipm would be only 1.5 revs per sec
so for my application both the 4.8vdc and the 65vdc motors should work off the same power supply just fine.
My cutting platform is only 8" x 10"
Now that being said: the 65vdc motor used full out should only produce 5.4 amps.
and the 4.5vdc motor used full out I would think at lets say 50vdc  "its 11 times the rated voltage"
the amperage would drop  below the 7 amps right.

56

General Mach Discussion / Re: I need a wiring diagram for a breakout board from cnc4pc

« on: March 28, 2008, 11:14:00 PM »

Yea the pdf doc is for rev 8, mine is rev 3: which is really similar but I just wanted a diagram for that model to be sure.

57

General Mach Discussion / I need a wiring diagram for a breakout board from cnc4pc

« on: March 28, 2008, 09:21:40 PM »

Hi all,
I have a  breakout board from cnc4pc and need a wiring diagram for it.
this guy Arturo Duncan that owns the company never gets back to me.
It's a c10 board and its revision #3
I need to use this one until PMDX gets the one built that supports the new
gecko 203v drives that are going on the machine.
Thanks,
Brian

58

General Mach Discussion / Re: Toroidal transformers vs standard IE

« on: March 28, 2008, 09:13:25 PM »

? it's a 4 wire motor and from what I'm told it was wound to get more torque out of this than the
regular version. How can I get the most out of this motor? Standard voltage is 65vdc with a amp rating of 5.4

59

General Mach Discussion / Re: Toroidal transformers vs standard IE

« on: March 28, 2008, 04:42:03 PM »

Cool,
I ordered 1 today to use for this system.

1 more question. I don't know if you can answer this but I will ask.
I have 2 Pacific Scientific step motors, both are nema 34, 1 says 65vdc 5.4 amps, the other says 4.8vdc 8.4 amps.
Now, I was told since I am using the new Gecko G203V drives which are rated for up to 80v 7 amps I can use these
motors. The ? is this, the drives are rated for 80vdc and 7amps can I use the motor that is rated 4.8vdc and 8.4 amps?
I was told by Pacsci to just hook them up in parallel and go with it. Do you see any problem with this?
I am going to be using a 54vdc 800 watt power supply with these drives.
Please let me know.
Thanks,
Brian

60

General Mach Discussion / Toroidal transformers vs standard IE

« on: March 27, 2008, 05:26:51 PM »

Has any one found a benefit from using either a Toroidal transformer or standard IE?

Just building another system, larger than the last.
I'm using 3 Pacsci Sigmax E33 65vdc 5.2-5.4 amp motors.
But I have a work area of only 10" x 8"
and mainly milling aluminium.
Drives are the new Gecko G203V. 
cap. 80v  7amp


Thanks,
Brian
KNS