Search found 21 matches

by orcinus
Fri May 18, 2012 8:59 pm
Forum: 3D Printing
Topic: Extruders
Replies: 34
Views: 12704

Re: Extruders

Main difference is, Greg's is easier to change the filament on (the idler block is hinged, while the one on Wade's is mounted with four bolts).
by orcinus
Thu May 17, 2012 12:05 pm
Forum: Electronics
Topic: Good thread on DIY Home Sensors.
Replies: 5
Views: 2002

Re: Good thread on DIY Home Sensors.

Why not buy something readily available?
http://www.ultimachine.com/content/hall-o
by orcinus
Tue May 01, 2012 7:38 am
Forum: Electronics
Topic: Measuring RPM?
Replies: 6
Views: 2148

Re: Measuring RPM?

Painting the shaft white on one side and using a regular, cheapo photo-diode RC tachometer works fine too. Just be ready to multiply the values you get by 2-3 (because most of them "think" they're working with a 2-3 blade rotor) and don't use it under fluorescent lighting or you'll end up measuring ...
by orcinus
Mon Apr 30, 2012 1:22 pm
Forum: Build Logs
Topic: MilFord's First Print
Replies: 9
Views: 2088

Re: MilFord's First Print

Thermal adhesive, like http://www.arcticsilver.com/arctic_silv ... hesive.htm should be a good idea.
by orcinus
Sun Apr 29, 2012 10:04 pm
Forum: Design Ideas
Topic: Dual Drive Setup (Dual Motor)
Replies: 28
Views: 7731

Re: Dual Drive Setup (Dual Motor)

You can't just increase frequency forever. Stepper motors have a mid-band instability (aka resonance) which limit speed. Increasing voltage moves torque-speed curve out allowing greater speed. That is what i've said, albeit not that clearly. My point being that lowering the voltage, while keeping t...
by orcinus
Sun Apr 29, 2012 1:14 pm
Forum: Design Ideas
Topic: Dual Drive Setup (Dual Motor)
Replies: 28
Views: 7731

Re: Dual Drive Setup (Dual Motor)

Voltage has nothing to do with speed in this case (at least as far as i know). Speed of a stepper is governed by the frequency - the speed at which the phases are switched (energized in an alternating fashion). Voltage does affect the torque, though (as does the current). I guess it also affects the...
by orcinus
Sun Apr 29, 2012 1:12 pm
Forum: Build Logs
Topic: MilFord's First Print
Replies: 9
Views: 2088

Re: MilFord's First Print

I did adjust the current on the drivers, but should check them again when I have time with the machine again. I'm supposed to do the power check when everything is powered up and connected, right? AFAIK, if you're using the reference voltage method, nothing needs to be connected (and, in fact, shou...
by orcinus
Sun Apr 29, 2012 1:00 pm
Forum: Electronics
Topic: STMicro Drivers
Replies: 34
Views: 12467

Re: STMicro Drivers

Netduino sounds like a bad idea. To me at least.
.Net and similar languages/environments aren't real-time and offer 0 guarantee that things will happen when you expect them (or time them) to happen. Even when this is not true, they tend to have significant latencies.
by orcinus
Sat Apr 28, 2012 12:14 pm
Forum: Assembly
Topic: Problem X Axis
Replies: 27
Views: 5685

Re: Problem X Axis

Owie. :?
Paint it, maybe she won't notice :lol:
by orcinus
Sat Apr 28, 2012 3:15 am
Forum: Build Logs
Topic: MilFord's First Print
Replies: 9
Views: 2088

Re: MilFord's First Print

Drivers overheating while just "pushing" a pen around doesn't quite seem normal...
Have you adjusted the current on the drivers?