[maellaguitars]

Hi everybody!

I'm new in this forum and also in the construction of CNC machines, even so I have most of the mechanical parts of my first project. The lenght of the axis are 1500 x 1000 x 400 mm, SBR20 and 1605 ballscrews.

http://www.cnczone.com/forums/attach...d=306412&stc=1

http://www.cnczone.com/forums/attach...d=306414&stc=1

At first, I wanted to buy a Chinese electronic kit, but soon I realized it would have been a waste of money and time (time means more money) if I had wanted to work efficiently with it. So after checking much informations regarding electronics I would like to go for an ethernet motion controller, some digital stepper drivers and 3 Sanyo Denki 3N/m motors, that is the best can afford my budget.

The problem is I would like you give some advise about ethernet motion controllers easy to get in Europe, since SmoothStepper and Geckos are not easy to find without importing. Also I would like to know if they would be compatible between them, since my electronics skills are limited.

For the moment, these are some of options I would be interested to get for my system:

DMS-481-Stepper-Motor-Drive

Leadshine DM556 Digital--5-6A.html

Leadshine Driver-EM705-DIGITAL

300Ncm-4-0A-Sanyo-Denki-Stepper-Motor

I like this board CSMIOIPM_4axis pretty much, but I would like to know motion controller + drivers options.

Any suggestions will be welcome and thanks in advance






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[ger21]

The CS Labs is probably the best ethernet motion controller available. It's highly recommended by everyone that's used them.

For drives, you might be able to save some money on Leadshine AM882's from Aliexpress.

[maellaguitars]

Many thanks for your quick response.

I was guessing it is one of the best controllers in this moment, but could I get any benefit if I go for CSMIO/IP-S? The machine is intended to cut and engrave hardwood, speed is fundamental but accuracy too.

Obviously I guess that I'll never be able to use the 4MHz this upper controller offers with the Sanyo Denki motors. I'll be quite happy getting maximum feeds of 5000mm/minute (1000 rev X pitch 5mm) but when get lost when I need to calculate the amount of pulses depending of the microsteping of the drivers. Too much information for me in such short time, two months ago I didn't know anything about CNC electronics and now I'm looking for motors with the lowest inductance, so then it's not needed such as voltage from the drivers... I'm not an electronics expert, but I hope I'll get a nice machine.

So which controller do you recommend me with my intent and the parts we discussed?

Many thanks.

[xjdubber]

I would also check out eding cnc, as far as getting a kit that will have the motion controller and steppers all in one, its going to be hard to find. Except for from China, where one size seems to fit all....

[ger21]

To be honest, I think you're going to see the gantry racking with the center mounted screw. If you drive the gantry with dual screws, then the IP/S is a better option, as the IP/M doesn't fully support slaving. Other than the slaving, the IP/M should suit your needs just fine. Keep your microstepping at 10 or less and you won't need anywhere near 125Khz.

Also, 5mm pitch screws are not the best choice. You'd have been better with 10mm pitch. I wouldn't count on getting a reliable 1000rpm from steppers, unless you run them at 60V or more.

[maellaguitars]

I would also check out eding cnc, as far as getting a kit that will have the motion controller and steppers all in one, its going to be hard to find. Except for from China, where one size seems to fit all....

Yes I did!!, but I don't like all in one things, when something breaks, you need to replace all. Besides it comes with software I don't know, well, in fact I don't know any postprocessor software yet, but Mach3 is quite popular and easier to get information about it.

[maellaguitars]

To be honest, I think you're going to see the gantry racking with the center mounted screw. If you drive the gantry with dual screws, then the IP/S is a better option, as the IP/M doesn't fully support slaving. Other than the slaving, the IP/M should suit your needs just fine. Keep your microstepping at 10 or less and you won't need anywhere near 125Khz.

Also, 5mm pitch screws are not the best choice. You'd have been better with 10mm pitch. I wouldn't count on getting a reliable 1000rpm from steppers, unless you run them at 60V or more.

Yes you are right, only there is one ball screw althogh the plates are drilled for mounting two screws. The man of the shop Dold Mechatronik | Ihr Online-Fachhandel f strongly recommended me that, but I decides to put just one for now and add another if needed later on.
The slave option you mentioned was one the doubts I had, and of course, I would like to have the option of adding another screw, if it required. So I'll investigate the not fully supported slave issue, because my intention is to add a fourth axis in the future.

Attachment 306430



Referring to the pulses, I can guess (hypothetically getting 1000rpm): 200 steps x 10 microsteps x 16.666 rev/s x 3 axis = almost 100000 pulses and the board provides 125kHz, (am I right?)

These days I've been reading few times this article but English is not my mothertongue and I use to loose some details.


Although you must be right with the pitch of the screws, and apart of that, do you suggest the motors and therefore the drivers I choose are wrong? or just the 5mm pitch is unnecesary for woodworking. I chose that because I thought it will be fine for 3D carving.

[ger21]

That's 125 Khz for each axis, not total.

No, it's the 5mm that's not good. The motors should be OK.