First Build 5 x 12 Steel Frame CNC router

**Ger21** · 07-03-2016

I'm building a 4x8 machine and using AC servos, and I'm using steppers and Leadshine AM882 drives for the Z axis (two, it's a dual Z machine) to save money.

I would think that a 5mm pitch ballscrew and a 600oz stepper would be OK for your machine? That's just a guess, though.

As for $400 servos. I've seen 400W servos on AliExpress for around $400, but not larger ones. And at that price, you may not know exactly what you're getting. I'm paying around $575 for 400w Leadshine motors and drives for my machine. 750W and 1Kw are closer to $800 a set. The price difference between 750W and 1Kw is very small, so I'd definitely go with larger ones for a little more money. http://americanmotiontech.com/motor-...tage-ac-input/

As for vacuum, you can never have enough. We have two 10HP Becker's on our Morbidelli with a 5x12 table, and could always use a bit more.

**Scott Damman** · 07-03-2016

Originally Posted by Ger21

I'm building a 4x8 machine and using AC servos, and I'm using steppers and Leadshine AM882 drives for the Z axis (two, it's a dual Z machine) to save money.

I would think that a 5mm pitch ballscrew and a 600oz stepper would be OK for your machine? That's just a guess, though.

As for $400 servos. I've seen 400W servos on AliExpress for around $400, but not larger ones. And at that price, you may not know exactly what you're getting. I'm paying around $575 for 400w Leadshine motors and drives for my machine. 750W and 1Kw are closer to $800 a set. The price difference between 750W and 1Kw is very small, so I'd definitely go with larger ones for a little more money. http://americanmotiontech.com/motor-...tage-ac-input/

As for vacuum, you can never have enough. We have two 10HP Becker's on our Morbidelli with a 5x12 table, and could always use a bit more.

Gerry do you have a forum for your build? I tried to do a search and didnt come up with anything.

The vacuum does worry me, I may have to add more or sell these I have an get a single larger unit... But we will see I think for now I will be able to work around the vacuum pumps that I have and see how things are.

Our friend Fred from BST Automation has 1kw servo motor + drive for 332euro +shipping which will cost you in total~400$ for the combo when you buy 4.

I am not sure you need exactly 1kw if you go with rotating ball nut. But as prices are similar. I think you will need 0.75kw geared like mine 20t:30t and that will give you speed of 20000mm/min on the long axis/ball screw with rotating nut/.

Ok I had came those on ali but like Gerry said I had no idea what I was looking at or what I would be getting. So having someone point them out is very helpful. For the cables, do you just make up longer cables or order specific lengths? 3m wont make it for the far side X motor. How have you found the shipping to be? I see it says 23 days... I wonder if thats pretty accurate or if they come faster than that.

The other motors/drives I came across was dynamic motor motion technology.

I need to dig deeper into your build Boyan and see how to built those ballnut drives. I found a few options online and on the forum here for how to build them.

Have your guys seen these
http://www.stober.com/motion_control/EZM_series/

I havent priced them and I know they cant be geared so that has to be taken into account but seems like a great way to run the ballnut.

I hope to have a plan here in the next couple days then I can run it by you all for advice before ordering everything up...

**Boyan Silyavski** · 07-03-2016

BST automation is the usual choice for Chinese stuff and linear rails, so its a well known and recommended seller. Price wise, packing, support and warranty.

Do you have a cable chain? If not i highly recommend the Russian ARKO 22x80 R60 which is cheaper and better than the similar Chinese

**Ger21** · 07-03-2016

Leadshine has 10m cables available for their motors.
I would email BST and ask if he has them for his motors. Or, you can always make your own.

At those prices, I'll have to seriously consider going that route, if it saves $225/motor.

I have a "build log" at CNC Zone, that's about 7 years long, with almost no actual building, and another 2 year old thread when I started the design.
I've got a few thousand dollars in components, but life doesn't leave me any time to get to it.
I also spent the last 3 years of my spare time working on this: www.jointcam.com
(Actually 2 years, and a year of doing nothing)

**JAZZCNC** · 08-03-2016

BST will provide cables upto 7mtr long. This is Video I made showing there 1.8Kw set.

**AVF** · 10-03-2016

Originally Posted by JAZZCNC

BST will provide cables upto 7mtr long. This is Video I made showing there 1.8Kw set.

Hi Jazz,
I saw your video which made me curious: would it be possible to use this 1.8kW servo and controller for driving a spindle or could I hit trouble doing so?
BTW: Nice thread - and sorry for my little hijack!

**JAZZCNC** · 10-03-2016

Originally Posted by AVF

Hi Jazz,
I saw your video which made me curious: would it be possible to use this 1.8kW servo and controller for driving a spindle or could I hit trouble doing so?
BTW: Nice thread - and sorry for my little hijack!

Don't want to let this run on so please start another thread if you want to know more.!!. . . But yes large Servo's are often used for Lower RPM spindles. Better controllers like the Cslabs IP-A let you control the spindle using Servo. This means you can use the Encoder for spindle orientation for things like ATC or Ridged tapping etc and do things like this.!