Quite an Unusual one

[Boyan Silyavski]

The shop

SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMQ-04BA1ANM3 400W w/CABLE thats what i bought for Z

SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMT-04BB1ANT3 400W w/CABLE thats for the gantry

Now the first motor is shorter and fatter and the second is smaller and longer, more like a typical stepper. Both are ok. When buying servo motors and drives make sure they are 220V AC, motor is standard inertia and not some specialized motor for a special purpose, that drive works in STEP DIR mode, especially take care with Iskawa as not all will work ok for CNC control. Make sure you buy them with cables as 1 cable is >100 euro or more

I was between these and Panasonic/ a bit more expensive/ but decided on price. The best thing about these drives is Autotuning. You push the button and it starts jogging for 3 seconds and that's it-its tuned.

So my recommendation is the SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMT-04BB1ANT3 400W w/CABLE as it more standard size. and smaller shaft or servo motor plus automatic tuning.

Another good options are the Minawa /Panasonic series /


The other money wise option is Chinese servo drive drive MCAC808 and 400w servo: 60ASM400 which last i checked were ~180USD if you buy lot/4/ from Shenzhen Just Motion Control Electromechanics Co.,Ltd. Write to Molly/remove space/ molly @jmc-motion.com
Tell her Boyan from Spain send you there so my 30 email exchanges with her help you with the price.
I would use these motors in my prototype machines and hopefully later. These are probably the cheapest servos ever directly from a manufacturer. If you send me your mail i will save you needless conversations and send you some documents about these servos.

Hope that helps. There are other options but these are my conclusions as a balance of features and moneywise

[Chaz]

The shop

SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMQ-04BA1ANM3 400W w/CABLE thats what i bought for Z

SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMT-04BB1ANT3 400W w/CABLE thats for the gantry

Now the first motor is shorter and fatter and the second is smaller and longer, more like a typical stepper. Both are ok. When buying servo motors and drives make sure they are 220V AC, motor is standard inertia and not some specialized motor for a special purpose, that drive works in STEP DIR mode, especially take care with Iskawa as not all will work ok for CNC control. Make sure you buy them with cables as 1 cable is >100 euro or more

I was between these and Panasonic/ a bit more expensive/ but decided on price. The best thing about these drives is Autotuning. You push the button and it starts jogging for 3 seconds and that's it-its tuned.

So my recommendation is the SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMT-04BB1ANT3 400W w/CABLE as it more standard size. and smaller shaft or servo motor plus automatic tuning.

Another good options are the Minawa /Panasonic series /


The other money wise option is Chinese servo drive drive MCAC808 and 400w servo: 60ASM400 which last i checked were ~180USD if you buy lot/4/ from Shenzhen Just Motion Control Electromechanics Co.,Ltd. Write to Molly/remove space/ molly @jmc-motion.com
Tell her Boyan from Spain send you there so my 30 email exchanges with her help you with the price.
I would use these motors in my prototype machines and hopefully later. These are probably the cheapest servos ever directly from a manufacturer. If you send me your mail i will save you needless conversations and send you some documents about these servos.

Hope that helps. There are other options but these are my conclusions as a balance of features and moneywise

Thanks.

[Chaz]

Any progress with this machine?

[Boyan Silyavski]

Any progress with this machine?

I need 5 days to finish it and could not find the time from a couple of months. Either i am on a vacation with wife, very busy with orders or tired. Hopefully very soon, as i start needing it.

left long ball screw is unmounted and the ball nut needs centering. Cause the bloody Chinese made it bigger than the drawing so it did not fit right in the rotating nut. Change one servo cable and make the enclosure box

[Scott Damman]

I need 5 days to finish it and could not find the time from a couple of months. Either i am on a vacation with wife, very busy with orders or tired. Hopefully very soon, as i start needing it.

left long ball screw is unmounted and the ball nut needs centering. Cause the bloody Chinese made it bigger than the drawing so it did not fit right in the rotating nut. Change one servo cable and make the enclosure box

Just have to say killer work! This thread has greatly helped me in the start and development stages of my build. Im excited to see yours up and running.

Thought I would post to keep track of your progress.

[Boyan Silyavski]

Some small progress.

At the end i found the cable problem that was making all time my Z axis servo trip. I measure all- fine, test the machine and the Z trips. measure again all connections fine. Come on.... Eliminated connectors and stuff, and at the end it was the cable. Some times giving error some times not.


Have found proper steel box for the electronics and painted it. Soon all will go there.


These days have made some test runs and had problems with the Pokeys57CNC board. Working a test program and after 15 min or so disconnects from mach 3. Had to reinstall all, update firmware and today at the end was working fine for the moment


Another problem with this board is the Spindle speed control. This could be my mistake though to lack of understanding. I read 10 times at least http://www.machsupport.com/forum/ind...c,32353.0.html and https://www.machsupport.com/forum/in...?topic=22727.0. So i have in my pulley ratio min 1000 max 24000 and ratio 1 and at the PWM screen of the plugin 1000hz refresh and i figured 1/240=0.004667 multiplier. So the problem being is even with mach3 stopped there is 3v from board and could not be lowered using the micro, did i say "MICRO" adjusting pot. Obviously i have to do something in the VFD adjustments, other wise from 12000 to 24000 rpm works fine with that numbers. I hope i am not wrong


So i have a couple of jobs queued already and no time to play a lot. So basically i will do some jobs as it is, cables are short to use full table length but i dont need that for the mooment.


Now remember what i have always said that i will not use it to mill steel. contrary to that i decided the first ever cut to be on steel, just to check if i could surface the table :-)

Opened HSMadvisor and as i dont have here any more suitable bits i plugged a 6mm 2 flute carbide, adjusted manualy the spindle speed and gave it a go. At 1mm depth of cut though, i did not want to get overexcited on the first run:





Well, it cut it dry without problems, but a spilled a bit of oil on the table , ha ha, The misting cooler is still not ready for that machine, though i have all the parts and the tubes are on place.

About the cut. No vibrations on the machine. Perfect surface, well it seems i have trammed well the head. Thanks god. As if you remember i did it using straight edge and precision squares. I did not have Dial Indicator at that moment. Just used it later to confirm.

The cut may not look great on picture, as its magnified, but believe me-it is mirror like and scratching with finger is like scratching glass.





here is the video of the first cut. My mobile amplified the sound, its quiet in reality, but if you listen to it you will hear not any ringing or whatsoever from the machine.





I decided to stop for today as i have no water pump connected to spindle. And came here to brag a bit

[NordicCnc]

The shop

SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMQ-04BA1ANM3 400W w/CABLE thats what i bought for Z

SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMT-04BB1ANT3 400W w/CABLE thats for the gantry

Now the first motor is shorter and fatter and the second is smaller and longer, more like a typical stepper. Both are ok. When buying servo motors and drives make sure they are 220V AC, motor is standard inertia and not some specialized motor for a special purpose, that drive works in STEP DIR mode, especially take care with Iskawa as not all will work ok for CNC control. Make sure you buy them with cables as 1 cable is >100 euro or more

I was between these and Panasonic/ a bit more expensive/ but decided on price. The best thing about these drives is Autotuning. You push the button and it starts jogging for 3 seconds and that's it-its tuned.

So my recommendation is the SAMSUNG SERVO MOTOR DRIVER CSDJ-04BX2, CSMT-04BB1ANT3 400W w/CABLE as it more standard size. and smaller shaft or servo motor plus automatic tuning.

Another good options are the Minawa /Panasonic series /


The other money wise option is Chinese servo drive drive MCAC808 and 400w servo: 60ASM400 which last i checked were ~180USD if you buy lot/4/ from Shenzhen Just Motion Control Electromechanics Co.,Ltd. Write to Molly/remove space/ molly @jmc-motion.com
Tell her Boyan from Spain send you there so my 30 email exchanges with her help you with the price.
I would use these motors in my prototype machines and hopefully later. These are probably the cheapest servos ever directly from a manufacturer. If you send me your mail i will save you needless conversations and send you some documents about these servos.

Hope that helps. There are other options but these are my conclusions as a balance of features and moneywise

Hello Boyan.

Nice machine I have to say. Looks very stiff! How is it running these days? Do you have a lot of work for it or mostly hobby stuff?

Anyway I wanted to ask how you went about auto-tuning the axis with double servo motors (Y-axis in my eyes, not the gantry). Auto-tuning is a very nice feature in any servo motor software, but I have not figured out how to tune an axis with double servo motors.

Also how did you go about calculating the servo motor size? Perhaps you have explained this in a post somewhere, but I couldn't find it! :)

Thanks!

[Boyan Silyavski]

Hello Boyan.

Nice machine I have to say. Looks very stiff! How is it running these days? Do you have a lot of work for it or mostly hobby stuff?

Anyway I wanted to ask how you went about auto-tuning the axis with double servo motors (Y-axis in my eyes, not the gantry). Auto-tuning is a very nice feature in any servo motor software, but I have not figured out how to tune an axis with double servo motors.

Also how did you go about calculating the servo motor size? Perhaps you have explained this in a post somewhere, but I couldn't find it! :)

Thanks!

Thanks!

I have sufficient work for the machine. Not as much as it deserves though. I make some product on it, sometimes for other people and sometimes cut letters for signs.

I tuned the Z and used same parameters on the other axis, as more or less motors a properly calculated for the loads on each axis, working at optimum.

Then one day i figured that if i move left or right motor 5mm, its not a problem as the gantry is like 2 meters. So there is play enough. Then i entered in Samsung software and limited the movement to 5mm each side and tuned the axis like that. With a short movement. I say 5mm just to be on the safe side, it could have been 10-15mm, on such a long gantry this is like nothing, before the other side tries to engage. In Real life if i switch off 1 motor i can move the gantry front/back even with one motor only .Of course autotuning stresses the thing, so better in the short safe range. Check all that range adjustment on the Z firts, so you dont bend something.

The servo motor size Jonathan or Dean helped me, its on the first pages somewhere. But basically 400 or 750W ac servo at 230vac are the thing for a machine like that. I went with 400w as ballnut is geared 3:2 so at 3k rpm of motor i am at 20k mm / min and my motor power is multiplied by 1.5 at that ratio. My motors support up to 6k rpm so ...

As far as i understand the things, Panasonic, Samsung or other brand servos are way better than the chinese ones, so if i was going with China servos would have went with 750w ones, as price is irrelevant also on the chinese servos. No big difference. But remember. All time i am talking about AC servos driven by 230VAC drives.