User:Currystomper
Introduction
I am an Electronic engineer and had quite a lot of success at work using Ardunio's to build the test systems at work. I thought it would be fun to build a rep(st)rap over the winter 11/12 with my son.
Last year I built a Cruzbike conversion kit (see currystomper on the Cruzbike.com forum)- so hopefully I will get to the end of this project over the winter!!.
I like the look of the Wolfstrap and so may start at that point.
...more later.
BedHead Foley
(An idea to be left in user space until I get some results - don't hold you breath for progress)
Having spent some time looking around the site, I think I'm going to start with a Wolfstrap, I like the idea of using a threaded rod to drive the axis's. However I see at the bottom of the page that stepper are far to slow for this. (Also they generate a system that is too accurate ie too many steps per mm.)
So you need to you choose course (cheap!!) 7.5 Deg steppers, hopefully this will be quicj enough maybe done before http://www.youtube.com/watch?v=R2jtnKcqdkQ
So here is my mad idea (foley!!) a brushless DC motor is actually a course stepper motor, when used with a threaded rod system this may give quite a nice drive system, so my plan is to made a single axis system to see if this is a mad idea or not. I can test out its max hold, repeatability over time and its max force.
If this works out it may reduce system costs quite a lot - maybe it holds out the possiblity of a system making some of its own drive systems too..
A bunch of DC Brushless Motor (BLDC motor) Links/thoughts :
Wikipedia :- BLDC motors
Lots of choice here
interesting view of a simple BLDC
Ha Ha - looks like it may work
Half bridge motor controller TLE4207G 1 1/2 needed per motor 2 or 3 $ each!!
BLDC has three wires therefore must be a Unipolar motor - no its a 3 wire bipolar.
driver chips L293D
Three phase motor driver L6234 STMICROELECTRONICS
Interesting Links
driver schematic for idea s...[[ http://cratel.wichita.edu/blogs/tommcguire/files/2007/08/cheapstep_r1.jpg]]
Easy mill
Linuxcnc
Influences
My Dad: an excellent Carpenter and wooden tool maker.
Leah Buechley MIT: High low tech [[1]]
