Newbie - Proxxon BFW 40 CNC conversion

[Jeff Davis]

It seems I have confused you, sorry.
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Purchase the stepper motor driver "Kit" from these guys. http://www.hobbycnc.com/products/hob...er-board-kits/ $79.00

It is in Kit form so you will need to solder it yourself or have someone do it for you.

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Buy this power supply
KL-320-36 36V/8.8 or 9.6A
110V/220V $59.95

from http://www.kelinginc.net

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The above 2 items and your motors is most of a CNC conversion. Along with that you will need shaft couplers, nema sized motor adapter plates, limit switches, software, 25 pin straight threw printer cable, ect.

The reference to Ebay was to keep you from buying used gear that may or may not work.

hth

Jeff

[hoss2006]

Originally Posted by Trevix Sorry, are you saying that the Circuit Specialist 30V or 24V are a good choice to be used with the HobbyCNC driver and my motors ? Wich one should I order ? 30V or 24V. After several days on the web I still can not tell how am I supposed to size the power supply, related to controller and motors.... Thanks for any help

The specs for their boards recommend 24V minimum and 36V max for the EZ board and 42V for the PRO board.
The more voltage, the faster you'll be able to run.
Hoss

[Trevix]

Since my last post, I bought a 4 axis controller from HobbyCNC and a KL-320-36 36V/8.8 or 9.6A power supply from Keling.

I am bad at theory but good at practice. I pretty easily assembled the board, but I noticed that there was not schematic (I think I read somewere that Dave does this to keep its business and avoid "replicants"...even tough any electronic kit I ever bought had schematics. Bah...).
The problem was that there was not even a general wiring drawing (you know...fuse, switch, Fan, etc.).

Looking at HobbyCNC web site I learned that I could find more info only in a Yahoo closed group. I needed some kind of permission from Dave (I think) and so for this weekend I am stuck!

On CMC zone I found a VERY,VERY long thread from a guy named Diarmaid (1.257 !! posts at http://www.cnczone.com/forums/showthread.php?t=25504) who had lots of problems (he was also very inexperienced) so I though I needed more info before trying out my motors.

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As I said before, I have 4 Powermax 1.8 model P21NSXC.LSS-NS-03. Problem is that the vendor instruction (see attachment) said they were Hybrid (?) steppers (unless since my motors are labeled "Powermax" and the doc is labeled "Powermax II" makes the difference) and that they can be connect with 8 lead, 6 lead 4 lead (bipolar so I think this last is excluded...).
I do not have a leaded connector (so no color coding). I both a strip that, cut in pieces of 8, will allow me to wire the motors.
The color hookups on HobbyCNC docs does not help me (my motor is not listed)

Man....I have a lot of questions but may be someone can help me out with these:

1. I believe I should connect as 8 lead, right? But since on the board the 2 "COM" are connected, I have 5 wire...
   
2. The motor pins are labeled 1 trough 8. Does it matter if you start from 1 or from 8 since they are simmetrical?
   
3. How do I wire the B,b,COM,COM,a,A output from the HobbyCNC controller to the 8 motor pins ?; something like A on 1,a on 6 ,COM on 2,5,4 and 7, B on 3, b on 8. If this is not correct, will I burn something ?
   
4. Once the stepper are wired, can I safely test them (after having done the Current adjustment), using the powersupply, Mach3 on WindowsXP, without fuses (just to see if they are turning) ? (I know...do not detach anything for a while after use...)
   
5. Since the power supply has short circuit/overload(overvoltage/over temp protection, do i rellay nee a fuse (so old fashioned...)?
   
6. The power supply has its fan. The controller will have its aluminum dissipator. Do I really need another fan on the box that will hold them all ?

I would appreciate any help. I know that I will not wait ...until monday, to see the motors spinning. May be you would like to avoid farther air pollution (smoke...) from another inexperienced guy.

Buy the way...with the help of a mechanical experienced friend of mine, I have already prepared the X and Y axis for my Proxxon BFW 40. Wanna see it ?

Trevix

[Trevix]

The photo did not come out...
Let me try again

[hoss2006]

You can double check the pins on the motor to determine the coils with an ohmmeter.
I'd imagine they number 1-8 left to right so you should get a reading on the ohmmeter by
connecting pins 1&5 , 2&6 , 3&7 , 4&8
should get opens when connecting any other pin combinations.
If this the case, then
1 = A
2&5 = COM
6 = a
3 = B
4&7 = COM
8 = b

that's how I'd try it.
Hoss

[Trevix]

I tried out and it works. Thanks.
But...just to know...since on the hobbyCNC the two COM pin of each axis are connected. this is really a 5 lead wiring, isn't it ?
1=A
6=a
3=B
8=b
2,5,4,7= COM

So I'm going to use a 6 lead shielded cable with pin 2,5,4,7 of the motor connected together. To avoid ground loop, the shiel is connected on one side only. See the attachment...
Is this correct ?
Connessioni motori.pdf