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Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is
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@bigdave said in Cnc breakout board for 4 axis milling machine.:
Hi, I have a 1.5kw mill running 4x NEMA 34 12nm motors and drives. I really like your platform and was wondering if you have a suitable board for my purpose.
What's the specification of the motors, and what drivers do you currently use? Duet 3 can drive some types of Nema 34 motors directly. OTOH the more expensive external drivers have features like mid-band resonance damping, which Duet 3 doesn't have yet.
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Hi, this is the detail given by the supplier in the kit.
1 x Closed Loop Stepper Driver 0-8.5A 20-80VAC/30-110VDC for Nema 34 Stepper Motor
1 x E Series Nema 34 Closed Loop Stepper Motor 12.0 Nm(1699.68oz.in) Encoder 1000CPR
1 x 1.7 m(67") Long Encoder Extension Cable for Closed Loop Stepper Driver
1 x RV-4 AWG18 1.7 m(67") Long Motor Extension Cable with GX16 Aviation Plug
Motor Specification
Part Number: 34HE59-6004D-E1000
Number of phase: 2
Holding Torque: 12.0 Nm(1699.68oz.in)
Rated Current/phase: 6.0 A
Phase Resistance: 0.7 ohms± 10%
Inductance: 7.9 mH ± 20%(1KHz)
Frame Size: 86 x 86 mm
Body Length: 150.5 mm
Shaft Diameter: Φ14 mm
Shaft Length: 37 mm
Keyway Shaft Length: 25 mm
Lead Length: 300 mm
Encoder Specification
Driving Voltage : 5V
Output current : 55mA
Resolution : 1000cpr
Output Signal : 2 Channels
Bore Diameter : Φ8mm
Output Frequency : ≤1MHz
Running Speed : ≤5000rpm
Driver Specification
Output Peak Current: 0~8.5A（0~6 RMS）
Input Voltage: 20~80VAC/30~110VDC (Typical 48/60VDC)
Logic Signal Current: 7~16mA (Typical 10mA)
Pulse Input Frequency: 0~200kHz
Pulse Width: 2.5μS
Built-in positioning and alarm output for easy detection and control
Intelligently regulate current, reduce vibration, noise and heat, and increase efficiency by 35%
With single and double pulse selection function, the factory default is: pulse + direction control
Excellent high-speed performance and rigidity, perfect combination of servo and stepping advantages
Connection
PIN
1
2
3
4
Color
White
Green
Blue
Black
Motor
A+
A-
B+
B-PIN
2
3
1
13
11
12
Color
Red
White
Black
Blue
Yellow
Green
Encoder
VCC
EGND
EA+
EA-
EB+
EB- -
This is the eBay link
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Also, to clarify my intent.
I’d like to get a complete kit from you that will allow me to build a multi use control panel that will allow me to move my motors between a number of machines. Mill, lathe, router, 3D printer, scanner ect.
I’d like to be able to setup machine profiles in the software to drive the different systems.
I’ve probably gone overkill on the (350w x4), drivers and motors and installed them into a mobile cabinet.
I’ll be installing breakers, surge protection and line filters into the panel.
Your system seems to be very intuitive and from what I’ve seen if it could be done then you’d be the people doing it.
I’m happy to incorporate anything you think appropriate to ensure a good outcome.
Thanks and regards
Dave
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That’s ok, I’m not in a rush. In the meantime I want to keep building so I’d like engage with you on the rest of the system so I get it right.
Can that be done offline? It would just be easier is all.
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Those stepper drivers need step and direction signals with a minimum signal level of 5V. As we don't yet have a Duet 3 board that supports external drivers, the best solution we can currently offer is Duet 2 WiFi or Duet 2 Ethernet, plus the Expansion Breakout Board.
We're planning a Duet 3 main board to support external drivers, but it probably won't be available this year.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42
Is the duet 3 capable of driving the motors directly? -
@bigdave not the ones you've linked to
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@jay_s_uk
I still have to install Ballscrews an mount my motors so I might try to wait it out -
@bigdave said in Cnc breakout board for 4 axis milling machine.:
Is the duet 3 capable of driving the motors directly?
Duet3 6HC is rated for 4.45A RMS (6A peak) and the motors are 6A, so you'd not make full use of the motors, but unless the low resistance pr coils is a problem it ought be possible to drive them at 4.45A.
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Except they have closed loop feedback which couldn't be used, which IMO would be a bit of a waste
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@dc42 Looking forward to doing something similar, is there any update on the Duet 3 with external drivers might be available? Or should I buy a Duet 3 mini with 3 1XD's?
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I'm sorry, we don't yet have an update on when Duet 3 with external driver support on the main board will be available. We are aware that a number of users are waiting for this.
The Duet 3 Mini can in theory support two external drivers using a breakout expansion board (as well as further external drivers using the 1XD expansion board).
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@bigdave
How is your project coming?I'm surprised you are using ball screws and a control without backlash compensation. Do you just need fast, without concern for precision? Is there something else drawing you to duet?
If duet had backlash comp, I'd put it on one (or more) of my desktop machines, but without it, I'm sticking with the existing LinuxCNC. I suppose one could use a Marlin or Beagle board, but I haven't used either yet, so I don't have a favorite or a reason to migrate. (Like standardization.)
