Search found 267 matches

by dc42
Fri Jun 16, 2017 1:35 am
Forum: Duet
Topic: Optimizing Duet setup regarding stepper current, jerk and speed
Replies: 2
Views: 137

Re: Optimizing Duet setup regarding stepper current, jerk and speed

You need to enter the inductance in Henries, then you get 737mm/sec. It's mm/sec not m/sec because the formula assumes a 2mm belt pitch. The reason it is so high is that the motors have low inductance and you are running them well below their rated current. You could certainly increase the current t...
by dc42
Thu Jun 15, 2017 6:38 pm
Forum: Rostock MAX v3
Topic: Stock Max v3 Motors on 24v?
Replies: 14
Views: 431

Re: Stock Max v3 Motors on 24v?

The uncalibrated MCU temperature on the Duet WiFi and Duet Ethernet should be within 13C of the true temperature. For the Duet 06 and 085, it could be up to 45C off.
by dc42
Sun Jun 11, 2017 3:27 pm
Forum: Rostock MAX v3
Topic: Stock Max v3 Motors on 24v?
Replies: 14
Views: 431

Re: Stock Max v3 Motors on 24v?

Higher current will reduce the likelihood of missed steps. However, if you increase the current much above the 1.2A that you are already using, then you will need to use a fan to cool your Duet 0.6 board. The best arrangement is a fan that blows cool air along the line of drivers on both sides of th...
by dc42
Sun Jun 11, 2017 2:20 am
Forum: Rostock MAX v3
Topic: Stock Max v3 Motors on 24v?
Replies: 14
Views: 431

Re: Stock Max v3 Motors on 24v?

Yes, inductance is normally quoted per phase.
by dc42
Fri Jun 09, 2017 4:11 pm
Forum: Rostock MAX v3
Topic: Stock Max v3 Motors on 24v?
Replies: 14
Views: 431

Re: Stock Max v3 Motors on 24v?

Thank you for the reply. The only 2A 0.9 deg motors I could find on http://www.omc-stepperonline.com and on Amazon have an inductance of 3mH, while the 1.68A motors I found on http://www.ultibots.com have an inductance of 2.8mH. Further, the holding torque of the 2A is 46Ncm vs 44Ncm of the 1.68A m...
by dc42
Fri Jun 09, 2017 8:11 am
Forum: Rostock MAX v3
Topic: Yet another Duet-to-HE280 accelerometer probe adapter
Replies: 69
Views: 3226

Re: Yet another Duet-to-HE280 accelerometer probe adapter

See https://duet3d.com/wiki/Connecting_a_Z_ ... tor.28s.29. If you have connected the JohnSL board to the Z probe connector, you should use P5 in the M558 command instead of P4.
by dc42
Fri Jun 09, 2017 8:08 am
Forum: Rostock MAX v3
Topic: Stock Max v3 Motors on 24v?
Replies: 14
Views: 431

Re: Stock Max v3 Motors on 24v?

I don't know those motors in particular. However, if you are looking for high travel speeds, when using the Duet WiFi or Duet Ethernet it's better to take advantage of the high current rating of the drivers and choose motors rated at 2A rather than 1.7A, because they will have lower inductance - ass...
by dc42
Wed Jun 07, 2017 6:00 pm
Forum: Rostock MAX v3
Topic: Stock Max v3 Motors on 24v?
Replies: 14
Views: 431

Re: Stock Max v3 Motors on 24v?

Like all other 3D printer boards, the Duets use constant current stepper drivers. This means that you do not need to change the motors or the motor settings in firmware when changing from 12V to 24V power.
by dc42
Sat Jun 03, 2017 7:54 am
Forum: Duet
Topic: Understanding Probing and Trigger Z Height
Replies: 10
Views: 439

Re: Understanding Probing and Trigger Z Height

If you adjust the G31 Z parameter and then run auto calibration, then the live M665 values will be altered based on the calibration results. You can see this by running M665 with no parameters, which displays the current values. However, the new values will not survive a power down/up or a reset unl...
by dc42
Tue May 30, 2017 1:51 am
Forum: Rostock MAX v3
Topic: Yet another Duet-to-HE280 accelerometer probe adapter
Replies: 69
Views: 3226

Re: Yet another Duet-to-HE280 accelerometer probe adapter

Either the adapter isn't registering a hit, or it is but it isn't being communicated to the firmware running on the Duet. Have you verified that you are using the correct wiring from the adapter back to the Duet, and the correct M558 command in the config.g file? Does the adapter have a LED that fla...
by dc42
Mon May 29, 2017 4:47 pm
Forum: Alligator Board
Topic: Firmware, Arduino IDE files
Replies: 1
Views: 433

Re: Firmware, Arduino IDE files

In case it's of any interest, there is now an up-to-date build of RepRapFirmware for the Alligator. See https://github.com/MarcoAntonini/RepRap ... e/releases.
by dc42
Mon May 29, 2017 4:42 pm
Forum: Mods and Upgrades
Topic: Chuckle - now I think about holddowns.
Replies: 4
Views: 201

Re: Chuckle - now I think about holddowns.

Swiss Clips take up much less room than binder clips.
by dc42
Mon May 29, 2017 4:40 pm
Forum: Rostock MAX v3
Topic: Yet another Duet-to-HE280 accelerometer probe adapter
Replies: 69
Views: 3226

Re: Yet another Duet-to-HE280 accelerometer probe adapter

I'm only getting an "Z probe was not triggered during move" every hit on the bed when it goes through the calibration and no lights are blinking off or on on my hotend or trinket, just the always-on green light on the trinket and the blue light on the hotend. I entered my results pre-duet...
by dc42
Sun May 28, 2017 2:09 pm
Forum: General Tips 'N Tricks
Topic: How-to: Dimensional Accuracy Calibration for Delta Printers
Replies: 50
Views: 7121

Re: How-to: Dimensional Accuracy Calibration for Delta Printers

Float glass is usually very flat, but when I had 3 bed plates cut for me from 4mm glass, one of them turned out to be warped. So it's best to check the glass for flatness against a straight edge.
by dc42
Mon May 22, 2017 1:49 am
Forum: Mods and Upgrades
Topic: Cheapskate and arms options
Replies: 8
Views: 322

Re: Cheapskate and arms options

Interesting, I recently upgraded my delta to Haydn Huntley's magnetic arms and ball studs, and I haven't had any problems yet. What arms were you using, and what problems did you encounter?
by dc42
Fri May 19, 2017 5:26 pm
Forum: Mods and Upgrades
Topic: Thermocouple Upgrade
Replies: 14
Views: 536

Re: Thermocouple Upgrade

The table at https://duet3d.com/wiki/Connecting_PT100_temperature_sensors#Duet_0.6_or_0.8.5 relates the signal names to the Duet 085 expansion connector. To relate the signal names to the connector underneath the daughter board, see connector J37 (SPI0) in the schematic at https://github.com/T3P3/Du...
by dc42
Fri May 19, 2017 5:11 pm
Forum: The Build Zone
Topic: Dinosaurs Build a Rostock Max V2 in Alaska
Replies: 56
Views: 8613

Re: Dinosaurs Build a Rostock Max V2 in Alaska

I'm glad you upgraded to the Duet, although surprised that the RAMBO succumbed to static discharge because it is better protected from abuse than any other 8-bit design I have seen. It's a good idea to ground the stepper motor cases, because the moving rubber belts build up static charge which can a...
by dc42
Thu May 11, 2017 7:23 pm
Forum: Duet
Topic: RostockMAX V3 to Duet WiFi conversion instructions
Replies: 68
Views: 2353

Re: RostockMAX V3 to Duet WiFi conversion instructions

Thank you mhackney, I'm about ready to jump in! But before I do, I have one Q... But I really like being able to print from an sd card and there's no place on the pi to have 2 sd cards (1 for the octoprint OS, 1 for the gcode). Does the Paneldue have someplace to accept the sd card with the gcode? ...
by dc42
Tue May 09, 2017 3:13 am
Forum: Rostock MAX v3
Topic: Thermistor Resting Value Incorrect
Replies: 5
Views: 242

Re: Thermistor Resting Value Incorrect

It's not uncommon to see large temperature errors from thermistors at room temperature in 3D printers. Assuming you get about the same error on both thermistors, it is caused by ADC gain error. In RepRapFirmware we provide a parameter to tune it out. The good news is that the temperature reading err...
by dc42
Wed May 03, 2017 5:53 pm
Forum: Mods and Upgrades
Topic: Thermocouple Upgrade
Replies: 14
Views: 536

Re: Thermocouple Upgrade

On the Duet, the symptom is temperature spikes of 2000C, indicating that the converter chip failed to get a good reading several times in succession.
by dc42
Wed May 03, 2017 2:10 am
Forum: Duet
Topic: Shorted layer fan
Replies: 4
Views: 286

Re: Shorted layer fan

You need hot air desoldering equipment to desolder the MOSFETs without damaging the PCB traces.
by dc42
Tue May 02, 2017 5:29 pm
Forum: Mods and Upgrades
Topic: Thermocouple Upgrade
Replies: 14
Views: 536

Re: Thermocouple Upgrade

Thermistors are cheap, easy to use, not very susceptible to interference (depending on your electronics), but not very accurate. PT100 sensors can be much more accurate if you use an interface that doesn't introduce errors. On the Duet we use a digital interface so that only 2 components have to be ...
by dc42
Fri Apr 28, 2017 8:31 am
Forum: Duet
Topic: Shorted layer fan
Replies: 4
Views: 286

Re: Shorted layer fan

Do the always-on fan connectors still work? - if no then the VIN trace between the power input terminal block and the VIN side of the fan voltage selector jumper block has probably fused and needs to be bypassed - if yes then the PWM fan mosfets are probably fused. You can probably tell just by look...
by dc42
Sun Apr 23, 2017 2:30 am
Forum: Rostock MAX v3
Topic: Thermistor Resting Value Incorrect
Replies: 5
Views: 242

Re: Thermistor Resting Value Incorrect

Even better, get a Duet WiFi/Duet Ethernet (OK, I am biased) with the PT100 daughter board AND a PT100 sensor, and use a 4-wire connection between the PT100 and the daughter board. See https://miscsolutions.wordpress.com/2016/06/25/more-delta-printer-upgrades-wifi-and-silence/. The use of a 4-wire c...

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