NordicCNC's build log

[NordicCnc]

Most AC servos have manufacturer made cables between the motor and drive.

Are you taking about within the control box? Or outside?

Yes, within the control box between the ESS breakout board and the servo drives.

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[NordicCnc]

Status update.

I have ordered all parts and have now received linear rails and ballscrews from BST automation. Stuff looks high quality, but to my unpleasant surprise I ahbe received 2005 ballscrews instead of the requested and quoted 2010 ballscrews... Looks like I will only be getting 7.5m/min rapids now...

I will try to sort this out with Fred, but my expectations are not high. I am not sure how it works with returning the parts. I already paid extremely expensive shipping (due to current world situation) and rip off custom clearance.. Feelings are not the greaterst right now, downgrading from 15m/min to 7.5m/min.

As mentioned earlier in the build log, I will be using servos rated at 3000rpm, with a 2:1 ratio to limit ballscrew rpm to 1500. As I said, I have also already ordered belts and pulleys for that gearing. Fuck. Rant over.

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[JAZZCNC]

No they will be correct, they are twin start screws. If you look carefully at the end you will see multiple threads, but it's easy to check just rotate the ballnut and measure how far it moves.

It's a common mistake.

The reason they use this method is it gives higher torque and lessens the depth required and keeps the screw stronger.

[NordicCnc]

No they will be correct, they are twin start screws. If you look carefully at the end you will see multiple threads, but it's easy to check just rotate the ballnut and measure how far it moves.

It's a common mistake.

The reason they use this method is it gives higher torque and lessens the depth required and keeps the screw stronger.

Omg I will be so happy when confirming this. I believe you and Andy. It really sucked out all my energy when measuring today. Now I have hope again!

I have also received following parts:
- 4x DMM 400w servo motors and drives. One is with a brake.
- ATC spindle from Jianken, 3.2kW with BT30 interface, sunfar E550 VFD, Waterpump and 100mm spindle bracket.
- Aluminium tooling plates from Germany.
- Ethernet SmoothStepper combined with MB3 breakout board.
- 1000mm straight edge DIN 874/2 and 300x200 square DIN875/1 from Helios Preisser.
- 20mm linear rails, 1605 and 2010 ballscrews, cable dragchains from BSTmotion.

I am still waiting for aluminium profiles and HTD pulleys.

I will post some pictures soon to show you guys all the hardware.

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[JAZZCNC]

Omg I will be so happy when confirming this. I believe you and Andy. It really sucked out all my energy when measuring today. Now I have hope again

99.9999% Sure they will be correct. I did exactly the same first time I came across them so yes I know that feeling you felt.!

[AndyUK]

Are you sure there aren't just two threads on the screws? I initially thought the same thing, then realised if I follow one helix it goes 10mm in one rotation.

[NordicCnc]

Are you sure there aren't just two threads on the screws? I initially thought the same thing, then realised if I follow one helix it goes 10mm in one rotation.

Not sure but I quickly measured from one high point on the thread to the next. I neez to check again tomorrow since I already left the garage. I hope you are right though!

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[NordicCnc]

Any recommendations on building your electronics enclosure yourself versus buying one? I am struggling to find one that I think will be large enough for any sensible price. I want to fit everything in the sam enclose, which includes:

(3 phase 400V mains)
- AC line reactor
- Mains filter
- E550 Sunfar VFD
- 4x Dyn4 drives
- 1A schaffner filters for each drive
- MB3 breakout board
- 1 or 2 24VDC power supplys
- Mains circuit breaker
- Contactor for E-stop circuit
- Relay for E-stop circuit
- Circuit breakers for each independent phase (insteaf of regular fuses)
- Terminals

It starts to seem like I would nees atleast a cabinet sized 800x600x250mm. I figure welding my out of sheet metal would be cheapest.

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[JAZZCNC]

Any recommendations on building your electronics enclosure yourself versus buying one? I am struggling to find one that I think will be large enough for any sensible price. I want to fit everything in the sam enclose, which includes:

(3 phase 400V mains)
- AC line reactor
- Mains filter
- E550 Sunfar VFD
- 4x Dyn4 drives
- 1A schaffner filters for each drive
- MB3 breakout board
- 1 or 2 24VDC power supplys
- Mains circuit breaker
- Contactor for E-stop circuit
- Relay for E-stop circuit
- Circuit breakers for each independent phase (insteaf of regular fuses)
- Terminals

It starts to seem like I would nees atleast a cabinet sized 800x600x250mm. I figure welding my out of sheet metal would be cheapest.

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Don't buy anything until you have everything electrical and lay it out on the bench. Servo drives require a lot more space than steppers for cooling purposes and just physically larger anyway. Also think about fitting fans and the Air flow when placing drives etc.

Given that your mostly using extrusion then I'd use aluminium panels and some small extrusion and build the control box into the lower frame if possible.

[JAZZCNC]

Talk about keeping us in suspenders,??? . . . . Was the pitch wrong.?