CNCCMV2

Overview

• The CNC Circuit Mill Version 2 is designed for superior ease of sourcing, fabrication, assembly, and disassembly, combined with high performance, scalability, modularity, and lifetime design- all at low cost.

Performance

• X Axis Travel Range = 20cm

• Y Axis Travel Range = 20cm

• Z Axis Travel Range = 5cm

• Step Motor Torque at 12VDC = 3.2kg-cm

• Spindle Max Rotation Speed = 22600rpm no-load

• Spindle Motor Torque at 24VDC = 88.5g-cm at max efficiency

• Workpiece Holding Mechanism = Linear Bolt and Tensioning Nut

Design

• Stock Steel Cube-shaped External Structure

• Stock Aluminum Angle-based Internal Structure

• Step Motor Axis Drive

• Rotary-to-Linear Motion Converting Stainless Steel Leadscrew and Wear-compensating Leadscrew Nut

• Anti-friction Bronze Sleeve Bearings

• Precision Stainless Steel Axis-Supporting Shafts

• Versatile Fastener-based Holding Platform

• Brushed DC Motor Spindle Drive

• Precision Stainless Steel Spindle Shaft

• Computer to Microcontroller to Stepper Driver Electronics Pathway

• Gcode Streamer to Gcode Interpreter Software Pathway

Cost

• Stock Metal = under 150 USD

• Leadscrews and Leadscrew Nuts = under 250 USD

• Precision Shafts = under 150 USD

• Bearings = under 100 USD

• Fasteners = under 70 USD

• Electronics = under 300 USD

• Software = Open Source

Sourcing

• Spreadsheet File

LINK HERE

• Prototyping Spreadsheet

• To edit or download the spreadsheet, click on the following link.

https://docs.google.com/spreadsheet/ccc?key=0AlpsBarfpPkzdFk5aDY3dHM0eEhfZHNkWVppdV9EelE

Modularity

• Different step motors and drive mechanisms can be mounted onto the axis support angles via mounting holes

• Different frames can be used, provided they have precise mounting holes for the axis support angles

• Different holding platforms can be used, provided they have mounting holes for the X axis moving angles

• Different spindle setups can be used, provided they have mounting holes for the Z axis moving angles

• Different stepper driver boards and power supplies can be used, provided they have compatible performance specifications within the electronics system

Scaling

• Scaling mainly consists of changing the size of the frame (to affect travel ranges) and the type of step motors (to affect travel rates)

• Other discrete components such as fasteners, leadscrews, and shafts need only be scaled if necessary for functionality or certain desired performance specifications

• The travel range calculation for the X and Y axes are as follows. Assuming that the frame remains an asymmetrical angle-cube, the travel range of the X axis equals that of the Y axis. The travel range for both axes is simply:

(X or Y Travel Range) = (Distance Between 2 Parallel Angles Along Vertical or Horizontal Plane) - (Length of Platform Along Axis)

• Hence the area covered by both axes are:

(XY Travel Area) = (X or Y Travel Range)^2

Usage

• Circuit Schematic to Gcode File Toolchain

• See following link for list of electronic design suites:

http://en.wikipedia.org/wiki/Comparison_of_EDA_software

• PCB-Gcode Optimizer

http://cnc.goodbits.net/wiki/index.php5/Pcb-gcode_optimizer

http://www.millpcbs.com/index.php?option=com_content&view=article&id=10&Itemid=44

GVCS Product Ecology

CNC Circuit Mill Product Ecology

Uses

• Induction Furnace - Steel

• Aluminum Extractor - Aluminum

• Metal Roller - Fasteners, Metal Angles, and Flats

• Rod and Wire Mill - Wires, Shafts

• CNC Multimachine - Bearings, Leadscrews, Leadscrew Nuts

• Motors - XYZ Movement

• CNC Circuit Mill - Control Circuit Boards

• Universal Power Supply - Power

Creates

• Milled Circuit Boards

See Product Ecologies for more information.