Anyone know how many kHz we can expect from the duet3 mainboard? @dc42?
Posts made by oarjjj
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RE: Duet 3 rated stepper KHz
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RE: Choosing correct motor for Delta
@lord-binky I have moons motors. They’re an old design, same as stepperonline and don’t run any better.
Maybe try Lin engineering if you’re looking to spend $50 per motor. Same company, totally different level of support and design. Lin has been around for a long time so lots of used ones out there.
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Duet 3 rated stepper KHz
I am purchasing a Duet 3 to replace my somewhat broken Duet 2 wifi and was looking at the specs. The processor is much more capable, and I understand the Duet 2 is rated for around 150 KHz with three steppers running.
Is the Duet 3 providing 256 microstepping using interpolation? This relieves the strain on the Duet 2 by only requiring the processor to output 16 microsteps. Do we know what the processor in the Duet 3 can handle?
I understand the expansion boards have their own processor, so I'm also curious what kind of KHz to expect from those too.
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RE: Wavy ridges in Mesh bed leveling on delta kossel xl
Some time has passed (new baby girl!) and I sat down with your advice to find the source of the problem. Moving the (genuine hiwin) carriages manually I found some binding in them at times.
Looking in to the problem I found that each of my carriages were missing 1 ball bearing. After adding the bearings, the problem has been completely solved.
My advice to anyone facing this problem is don't give up! and try practical tests like the ones David has mentioned. It's a frustrating experience but there is a solution!
Thanks again dc42!
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RE: Wavy ridges in Mesh bed leveling on delta kossel xl
@dc42
24 volt PSU. Running at 1.5a I can generally run them as fast as possible. Somewhere around 300mm/s. You can't print that fast so I generally limit them to about 65mm/s.Anything above 1.5a, with a nozzle speed of higher than 40mm/s generates a lot of noise and vibration. The frame of the printer really rattles and if you feel the carriages, they're very notchy in their movement.
Normally the printer is essentially silent.
This is the 24v PSU I am using.
Cosel ADA1000F-24
https://octopart.com/ada1000f-24-cosel-82700There some voltage drop from the 400w heated bed so I adjusted it to be about 24.9v. I've tried to reduce the cable lengths as much as possible as well as double 16ga wire to the heatbed, and that's helped with the voltage drop considerably.
At 1.5a the motors have never heated up. Higher than that, although I've only done limited prints at like 1.8a (very noisy) doesn't make any heat either. I can heat up the extruder motor just fine though.
I usually run them at 1/16 with interpolation. They do run smoother at higher currents when using straight 1/64 microstepping.
Here's the mesh leveling with 2.0a current, 1/64 microstepping and 40mm/s max speed.
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RE: Wavy ridges in Mesh bed leveling on delta kossel xl
Well, I ordered new rods and balls from Haydn with 10mm tubes this time. Same problem. I also need to retune my radius as they are .1mm longer than the old set.
I've been using this lube:
White Lightning Clean Ride The Original Self-Cleaning Wax Bicycle Chain Lubricant, 8-Ounce Drip Squeeze Bottle
https://amzn.to/2JZUg9YThese are the motors, from Amazon:
MOONS' 0.9deg NEMA17 Stepper Motor 3D printer 2A 0.39Nm(55oz-in) 2Phase 39.8mm(1.57in.) High Accuracy Step Motor for CNC (Stepping Motor Cable00723 include, model MS17HA2P4200)
https://amzn.to/2I3dSXVCurrent is 1.5a. Anything more than that and I get a lot of vibration and noise from the motors. I'm beginning to think they may need replaced. I used the guide in the wiki to select them based on the recommended specs.
Specs are:
Parameter Unit Value
Phase 2
Step Angle 0.9°
Shaft Single
Frame Size NEMA17(42mm)
Length mm 39.8
Rated Current A 2
Holding Torque Nm 0.39
Holding Torque oz-in 55.23
Resistance Ohms ±10%@20℃ 1.05
Inductance mH Typ. 2.8
Coil Type Bi-Polar
Detent Torque mNm 16
Rotor Inertia gcm² 57
Front Shaft Length mm 24
Front Shaft Diameter mm 5
Terminal Number 4
Connect Plug
Insulation Class B(130°C)
Approvals RoHS
IP Rating IP40
Weight kg 0.29So, motors next?
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RE: Wavy ridges in Mesh bed leveling on delta kossel xl
They're all tight but I'm going to try some new rods and ball joints to see if that helps since one of the rods is bent.
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Wavy ridges in Mesh bed leveling on delta kossel xl
I've been trying to work out an issue with backlash on my kossel xl. I built it using DC42's guide, almost exactly. I understand the ridges relate to backlash but I can't seem to find it. Actually, I'm not sure which motor it is on based on the direction of the ridges.
The printer does a good job printing, I just have some backlash that's visible depending on what I print.
One of the stepper drivers on my duet wifi is bad. I switched to use the E2 stepper. Could this be related? It says there's a short to ground.
I put some more points on the auto calibration file. It calibrates at around 0.04. I've had it down to as low as 0.02, but the problem with backlash seems to be getting worse.
Things I've tried:
Lowering accel/jerk as much as possible.
Lowering speed and dive height on probe.
Checking the frame is square and level. Build plate is level as far as my micrometer can tell.
Lubricating magballs, carriers, linear rails
Removing zesty nimble entirely
Checking for loose magballsThings I've found:
The magballs need a lot of regular lubrication. Like every 24 hours of printing.
Linear rails need lubrication every month or so.
One of my rods is bent on the Z axis. When you rotate it on the magball, you can see the bend in it.
My steppers vibrate pretty bad at above 1.5a current. They never get hot. I just leave it at 1500ma.
I tried using steel core belts. I think it helped some but they were wearing out the pulleys so I switched back.Machine specs:
Followed DC42's large kossel guide
Duet wifi with smart effector
zesty nimble
Rubber gt2 belts, fiber reinforced from amazon
Optical endstops
1m linear rails with genuine hiwin carriages and duet3d pcb !magball mounts
Haydn's arms 480mm
400mm diameter bed on mic6 plate
16 tooth pulleys, smooth upper pulleys
moons 0.9 2.0a steppersFirmware Version: 2.02(RTOS) (2018-12-24b1)
WiFi Server Version: 1.21
Web Interface Version: 1.22.6Configs attached:
2_1553361419220_heightmap.csv
1_1553361419219_config.g
0_1553361419219_bed.g