Search found 107 matches

by calica
Sun Apr 29, 2012 8:46 pm
Forum: Design Ideas
Topic: Dual Drive Setup (Dual Motor)
Replies: 28
Views: 5986

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). You can't just increase frequency forever. Stepper motors have a mid-band instability (a...
by calica
Sun Apr 29, 2012 7:54 am
Forum: For Sale
Topic: Buildlog.net Arduino Compatible Stepper Shields available
Replies: 93
Views: 26390

Re: Buildlog.net Arduino Compatible Stepper Shields availabl

@ejs, I do have a small request/recommendation for your kit and I have posted this already with the other forum. In this version, we have an option of using 4 axis or using 2 driver to drive 2 stepper from 1 signal BUT they are using jumper switch which I find very confusing. Is it possible to chan...
by calica
Sun Apr 29, 2012 7:49 am
Forum: Discussion
Topic: Backlash?
Replies: 7
Views: 7413

Re: Backlash?

Imagine the X moving in the + direction. Then it reverses and moves in the - direction. Backlash is the amount the machine thinks it moves before there is any actual movement. Its caused by the slop in the drive system. It causes circles to not be round. Take a look at this object for 3d printers. I...
by calica
Sun Apr 29, 2012 7:21 am
Forum: Design Ideas
Topic: Dual Drive Setup (Dual Motor)
Replies: 28
Views: 5986

Re: Dual Drive Setup (Dual Motor)

My understanding is as follows (easily wrong): Wiring the motors in series keeps the current the same but halves the voltages. This keeps torque but reduces max speed. Because there are now two motors torque is effectively doubled. I don't think speed(voltage)= is linear. Wiring the motors in parall...
by calica
Sun Apr 29, 2012 6:52 am
Forum: Discussion
Topic: For nema23 motor
Replies: 14
Views: 3565

Re: For nema23 motor

Speaking of repraps and belts/pulleys. Check on this page from MendelMax. They recommend GT2 belts/pulleys. GT2 has a round tooth profile. This limits backlash.
by calica
Sun Apr 29, 2012 6:38 am
Forum: Software - CAD, CAM, Workflow Help
Topic: PyCAM on Mac OS X
Replies: 36
Views: 29918

Re: PyCAM on Mac OS X

You also need to install command line tools for Xcode. Running "brew doctor" will give you more info.

Great info BTW! Thanks. I've been putting off installing pyCAM because I don't really like MacPorts. Doing this on with homebrew is much nicer.
by calica
Fri Apr 27, 2012 10:20 pm
Forum: Electronics
Topic: Stepper Connector
Replies: 16
Views: 5163

Re: Stepper Connector

Another choice is the pre-SATA Molex harddrive power connector. I'm sure most of us have a box full of them from fan, floppy, sata adapters.

Not good for mounting on an enclosure and not pretty.
by calica
Fri Apr 27, 2012 5:47 am
Forum: Electronics
Topic: Higher amp power supply?
Replies: 6
Views: 1216

Re: Higher amp power supply?

Another option: http://www.ebay.com/itm/DC-DC-converter ... 3cc5701c49

Gives you 5V from 8-23V. Don't know if I'd trust the 3A rating but should be fine for the arduino. Only $2 free shipping.
by calica
Fri Apr 27, 2012 5:36 am
Forum: Electronics
Topic: Higher amp power supply?
Replies: 6
Views: 1216

Re: Higher amp power supply?

Any reason you don't want to power the arduino off the USB port?
by calica
Fri Apr 27, 2012 2:13 am
Forum: DIY Spindles
Topic: DC Spindle (RC Based)
Replies: 21
Views: 14679

Re: DC Spindle (RC Based)

Power supply issues are a problem. Luckily, I have a 12V (actually 13.6V) 40A supply from long ago. Maybe putting a marine deep cycle battery parallel will allow it to handle the surges. This is quickly getting into the price range of: http://www.aliexpress.com/product-fm/524589549-1pcs-Water-Cooled...