Home Built Hot Wire CNC Foam cutter
Day 1 - Vertical Y Axis
Day 2 - Horizontal X Axis
Day 3 - Lead Screw
Day 4 - Electronics
Day 5 - Finalizing the machine
Other CNC foam cutters
A New Design - Hot wire CNC Foam cutter
Foam Sample Cuts
Foam Cutting Videos
Links - RC stuff, Stepper Motors, Lead Screws
More information - about stepper motors

Links
DIY Mach3 with Joystick and gamepad
FoamLinx Site - Foam Cutting CNC Machines
CNCLinx Site - CNC Router Tables
Foam Cutting Services - EPP, EPS, XPS
All About Foam Forum - Beta
Composites Prototyping and Design
Large and Configurable CNC Machines *
Online Store



Articles
How to coat EPS foam (Crown Moldings)
How to build an EPS Foam Recycler
How to build an EPS base and Cap cutter
How is EPS manufactured - molded
How to make RC foam planes
How to cut EPS, XPS, EPP foam
How to cut Polyurethane foam ( PU )
How to cut Acrylics - Laser cutting
DIY CNC Foam Cutter Blog - New

What is - more info about foam
What is EPS foam
What is XPS foam
What is EPP foam - Expanded Polypropylene
What is PE foam - Polyethylene foam
What is Polyurethane foam
What is Memory Foam

 

Sunnyvale

                      Useful info from around the web

   Some help with the French cutting software

   How to use Profscan (how to cut shapes other then wings)

   How to modify the Stepper motor driver board to drive an XYZ table.
       Software from www.kellyware.com



   How to hook up the Vexta motor to our stepper motor driver board - 6 wire Unipolar motors
       These boards are not in use anymore - This is an old board which we don't carry anymore
       If you are looking for stepper motor driver boards, click here

From left to right
Black | Yellow | Green | Blue | White | Red |

 


 

 

How to hook up the STP57D317 motor to our stepper motor driver board

From left to right:
Brown | Black | Orange | Yellow | White | Red

Or when the extension cable is connected:
Brown | Black | Blue | Green | White | Red

For stepper motor driver boards, click here

 


Bipolar motors
There are only two coils, and current must be sent through a coil first in one direction and then in the other direction; thus the name bipolar.
Bipolar motors need more than 4 transistors to operate them, but they are also more powerful than a unipolar motor of the same weight.
To be able to send current in both directions, engineers can use an H-bridge to control each coil or a step motor driver chip.

Unipolar motors
In a unipolar stepper motor, there are four separate electromagnets. To turn the motor, first coil "1" is given current, then it's turned
off and coil 2 is given current, then coil 3, then 4, and then 1 again in a repeating pattern. Current is only sent through the coils in
one direction; thus the name unipolar.
A unipolar stepper motor will have 5 or 6 wires coming out of it. Four of those wires are each connected to one end of one coil.
The extra wire (or 2) is called "common." To operate the motor, the "common" wire(s) is(are) connected to the supply voltage,
and the other four wires are connected to ground through transistors, so the transistors control whether current flows or not.
A microcontroller or stepper motor controller is used to activate the transistors in the right order. This ease of operation makes
unipolar motors popular with hobbyists; they are probably the cheapest way to get precise angular movements.

(For the experimenter, one way to distinguish common wire from a coil-end wire is by measuring the resistance.
Resistance between common wire and coil-end wire is always half of what it is between coil-end and coil-end wires.
This is due to the fact that there is actually twice the length of coil between the ends and only half from center (common wire) to the end.)