Search found 68 matches

by rurwin
Wed Dec 07, 2016 4:59 am
Forum: Mods and Upgrades
Topic: Code Compliant (NEMA?) Power Supply Wiring/Enclosure Advice?
Replies: 8
Views: 1650

Re: Code Compliant (NEMA?) Power Supply Wiring/Enclosure Advice?

This might be a good starting point: m I think IEC6044-1:2007 is the current applicable standard. It is only available for money, and rather a lot of it. However, the Indian standard seems to be identical (albeit the 2002 edition) and does seem to be available: m Warning: it's long, complex and you ...
by rurwin
Thu Nov 24, 2016 7:08 am
Forum: Troubleshooting
Topic: Temp fail causing print fail
Replies: 18
Views: 2518

Re: Temp fail causing print fail

There are two values that limit the maximum drive: DRIVE_MAX and PID_MAX. Both of these are overridden by the values in the EEPROM. In vanilla Repetier (I'm looking at github) PID_MAX defaults to 255, but it's worth checking your EEPROM to be sure. DRIVE_MAX defaults to 140, which a comment in confi...
by rurwin
Sun Nov 20, 2016 9:10 am
Forum: The Lounge
Topic: Those green mats?
Replies: 9
Views: 1754

Re: Those green mats?

I don't think I'd trust any of them for measuring. They are self-healing cutting mats and are primarily useful for when you don't want to mark your worktop with scalpel cuts.
by rurwin
Mon Nov 07, 2016 4:09 am
Forum: The Build Zone
Topic: mhackney's Beta DropLit build
Replies: 196
Views: 37574

Re: mhackney's Beta DropLit build

I think you've got it sorted, but regarding static... All the wall-warts I have seen are isolated from the mains, which means you don't get an Earth connection. Although of course your 0V does get connected to the other power supplies and those are, or may be, earthed. I'd suggest earthing everythin...
by rurwin
Sun Nov 06, 2016 7:29 pm
Forum: Computer Hardware
Topic: Trying to setup Octoprint n a raspberry pi
Replies: 13
Views: 4626

Re: Trying to setup Octoprint n a raspberry pi

The Raspberry Pi 3 is by default set to a safe WiFi region in that it only uses channels that are valid everywhere. That can be a problem in Europe at least as we can use three more channels. If your router has chosen one of those then you will have problems. To fix it, you need to ssh to the Pi and...
by rurwin
Sun Nov 06, 2016 7:17 pm
Forum: Troubleshooting
Topic: Error in Step 6 of new Rostock V3
Replies: 12
Views: 1110

Re: Error in Step 6 of new Rostock V3

Are you saying that the carriages hit something else before the screws touched the end-stop switches? I find that difficult to believe. On this Orion, which is not that different from a V3, the screws are higher than anything on the carriage and the endstop switch is lower than anything else attache...
by rurwin
Sun Nov 06, 2016 7:07 pm
Forum: Troubleshooting
Topic: Fixing the controller (RepRapDiscount)
Replies: 11
Views: 1645

Re: Fixing the controller (RepRapDiscount)

The 10-pin cable. Examine it for any obvious flaws. Get a meter for continuity tests, a couple bits of wire to poke in the connector, and check that pin 1 is actually connected to pin 1 on the other side. Ditto for the other 9 pins. You should also check for shorts between two adjacent cores. Eithe...
by rurwin
Thu Nov 03, 2016 5:23 am
Forum: General Tips 'N Tricks
Topic: Baking Water out of PLA
Replies: 11
Views: 7155

Re: Baking Water out of PLA

Vacuum works by reducing the boiling point of the water. You should get the same or better effect as heating it. (175F is not boiling point) There will be other effects though; you won't get the annealing effect of heat and boiling the water too rapidly may crack the PLA. Probably nothing that would...
by rurwin
Wed Nov 02, 2016 12:46 pm
Forum: Show us your machine!
Topic: My machines
Replies: 83
Views: 23764

Re: My machines

Also remember that houses in the UK , and Europe generally, may be older than you are used to. Our current house was built in 1920. The house we moved from, which would be considered an ideal starter home, was built in the late 1800's. Such buildings will have been rewired more than once in that tim...
by rurwin
Wed Nov 02, 2016 12:38 pm
Forum: Show us your machine!
Topic: My machines
Replies: 83
Views: 23764

Re: My machines

Generally breakers these days. One reason is that fuses were universally of the rewirable variety, which is subject to abuse and accident, not to mention the difficulty of repairing it at night in the event of a failure in the lighting circuit. Another reason is that the current regulations specify ...
by rurwin
Wed Nov 02, 2016 11:04 am
Forum: Show us your machine!
Topic: My machines
Replies: 83
Views: 23764

Re: My machines

(And indeed, I've heard of some circuit designs where there are only a small number in the house, typically lighting, kitchen appliances, bathrooms and wall outlets) You are correct. Certainly in the UK there would be one or more circuits for power and one or more for lighting, almost invariably on...
by rurwin
Tue Nov 01, 2016 9:35 am
Forum: Mods and Upgrades
Topic: Interfacing to the new HE280 accelerometer...
Replies: 130
Views: 18779

Re: Interfacing to the new HE280 accelerometer...

"the tap isn't nearly as loud" That makes me wonder: could one use a microphone as a sensor? Strap it to the glass and it would register a pulse a fraction of a millisecond (sound travels 4.5m/ms in glass) after the probe hits. During normal operation nothing hits the glass. There's the no...
by rurwin
Tue Nov 01, 2016 9:21 am
Forum: Show us your machine!
Topic: My machines
Replies: 83
Views: 23764

Re: My machines

Way back in the day a friend of mine created a 252V battery from NiCds. It powered switched mode power supplies just fine, since the first thing they did was to rectify and smooth the mains. That was thirty odd years ago though and there may be other circuitry on the input now. Not to mention that h...
by rurwin
Mon Oct 31, 2016 1:02 pm
Forum: Mods and Upgrades
Topic: Zesty Nimble extruder technical thread
Replies: 44
Views: 9866

Re: Zesty Nimble extruder technical thread

To add to what Lykle said, it is the gearing that limits hysteresis. Hysteresis is caused by twisting of the cable. Going forward it will wind up a certain amount of twist and when you retract, that has to be unwound and wound up in the other direction before the filament starts to move backwards. H...
by rurwin
Fri Oct 28, 2016 6:59 am
Forum: Mods and Upgrades
Topic: Interfacing to the new HE280 accelerometer...
Replies: 130
Views: 18779

Re: Interfacing to the new HE280 accelerometer...

If you choose a processor with an ADC, which is easy, you could use a ten-turn pot to set sensitivity and get 8 or 10 bits of resolution.
by rurwin
Wed Oct 26, 2016 6:56 pm
Forum: Mods and Upgrades
Topic: Interfacing to the new HE280 accelerometer...
Replies: 130
Views: 18779

Re: Interfacing to the new HE280 accelerometer...

The Chinese PCB manufacturers can do board assembly as well. Here's one with an online estimater: m I've not ordered anything from them, and you would have to be careful, but worth seeing if it makes sense. From a quick play it looks like 10 boards would be ~$50 each but 100 boards would be ~$8 each...
by rurwin
Wed Oct 26, 2016 12:21 pm
Forum: Troubleshooting
Topic: Need help calibrating extruder height.
Replies: 7
Views: 945

Re: Need help calibrating extruder height.

I tried following that video, but it's such a dramatic change that it makes no difference. The extruder swings from the center and raises to the edge, as you saw in my video. In the video they show the radius change creating a rise like yours but of around two inches by changing the radius from 129...
by rurwin
Wed Oct 26, 2016 11:06 am
Forum: Mods and Upgrades
Topic: Interfacing to the new HE280 accelerometer...
Replies: 130
Views: 18779

Re: Interfacing to the new HE280 accelerometer...

If you want to emulate the endstop, maybe you could hold the signal on until you see a medium force in the same direction (as the head pulls away from the bed.)
by rurwin
Wed Oct 26, 2016 10:43 am
Forum: Troubleshooting
Topic: Need help calibrating extruder height.
Replies: 7
Views: 945

Re: Need help calibrating extruder height.

https://www.youtube.com/watch?v=g3CqWxTcV38
Bed radius calibration starts at about 3:30 into the video. That's almost two years old, but I don't imagine it's changed much. At least the process and the required adjustment rates and effects will be the same.
by rurwin
Tue Oct 25, 2016 9:30 am
Forum: Troubleshooting
Topic: Octoprint
Replies: 28
Views: 1854

Re: Octoprint

If you do cut that cable in half, you will be astounded by how thin the power wires are.

Also you are depending on them using the correct colour wires, which they do seem to do surprisingly often, but still...
by rurwin
Tue Oct 25, 2016 4:01 am
Forum: Troubleshooting
Topic: Octoprint
Replies: 28
Views: 1854

Re: Octoprint

It's a real pain wiring to a micro USB connector; I've tried it. Just be careful and consider fitting a fuse.
by rurwin
Mon Oct 24, 2016 11:19 am
Forum: Troubleshooting
Topic: Octoprint
Replies: 28
Views: 1854

Re: Octoprint

Yes, but... The maximum USB draw for a single device is 500mA. So adding the webcam puts you closer to the limit. The HDMI should not draw much current, about the most is 50mA to power the EEPROM that the screen characteristics are read from. The old wisdom that most of the power is taken by the gra...
by rurwin
Mon Oct 24, 2016 8:59 am
Forum: Troubleshooting
Topic: Octoprint
Replies: 28
Views: 1854

Re: Octoprint

The Rambo 1.3 schematics show that the 5V supply is generated by a LM22675 chip, and that is rated at only 1A output. The Raspberry Pi 3 is specified to take 2.5A, and while a good part of that is for the expected draw from the USB sockets, you are right on the edge. I would not be at all surprised ...
by rurwin
Sun Oct 23, 2016 3:18 pm
Forum: The Lounge
Topic: Zesty Nimble extruder Kickstarter campaign...
Replies: 16
Views: 3225

Re: Zesty Nimble extruder Kickstarter campaign...

There's a few things Kickstarter is guilty of. I don't like their habit of only pushing the popular projects on social media. Not only are those the projects that don't need any further attention, leaving many others starved of cash, but over subscription is the main reason projects fail. There are ...
by rurwin
Sun Oct 23, 2016 9:48 am
Forum: What are YOU making?
Topic: Can you guess what these are for?
Replies: 1
Views: 776

Can you guess what these are for?

A quick design I knocked up the other day to get the workshop in the shed up and running. I bet you can't guess what they do. https://dl.dropboxusercontent.com/u/96640124/20161023_143602.jpg The power cable from the house to the shed needs to run up a wall and then across to the shed and down again....

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