CNCCMV2/Overview: Difference between revisions

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(Created page with "=Key Performance Specifications= *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 Rotat...")
 
 
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=Key Performance Specifications=
=Performance=


*X Axis Travel Range = 20cm
*X Axis Travel = under 225mm


*Y Axis Travel Range = 20cm
*Y Axis Travel = under 225mm


*Z Axis Travel Range = 5cm
*Z Axis Travel = under 120mm


*Step Motor Torque at 12VDC = 3.2kg-cm
*Step Motor Resolution = 1.8 degrees per step


*Spindle Max Rotation Speed = 22600rpm no-load
*Accuracy = +/- 5%


*Spindle Motor Torque at 24VDC = 88.5g-cm at max efficiency
*Step Motor Torque = XXkg-cm at 12VDC


*Workpiece Holding Mechanism = Linear Bolt and Tensioning Nut
*Spindle Speed = 1050Kv


*For Prototype II, define goals based on study of industry standards. Include desired precision + accuracy + speed.
*Repeatability Goal: +/- 0.01mm
**Minimum step size for each axis plus variance
**Repeatability of motion (drift) (determined by going to certain locations a large number of times)
**Minimum spacing between traces (determined by minimum allowable size of bit + precision)
**Minimum trace size possible
**Goal: repeatability is as good as step size - ie, all inaccuracy is negligible compared to step size, and zero backlash at all practical milling speeds.
**Define practical milling speed range based on substrate


=Key Design Specifications=
*Nominal Milling Speed (Copper on FR-4):


*Step Motor Axis Drive
=Design=


*Rotary-to-Linear Motion Converting Stainless Steel Leadscrew and Wear-compensating Leadscrew Nut
*Major Frame Type: Mobile Gantry


*Anti-friction Bronze Sleeve Bearings
*Minor Frame Type: Blocks on Plate, Double Drive X Axis


*Precision Stainless Steel Axis-Supporting Shafts
*Axis Drive: Step Motor


*Versatile Holding Platform with Magnets
*Rotary-to-Linear: Ultra-smooth Threaded Rod and Wear-compensating Nut


*Brushed DC Motor Spindle Drive
*Anti-Friction: Bronze Sleeve Bearings


*Precision Stainless Steel Spindle Shaft
*Axis Supports: Precision Stainless Steel Shafts with Holding Collars


*Computer to Microcontroller to Stepper Driver Electronics Pathway
*Working Platform: Magnets and Reference Holes on Platform


*Gcode Streamer to Gcode Interpreter Software Pathway
*Spindle Drive: Brushless DC Outrunner Motor
 
*Spindle Shaft: Precision Stainless Steel Shaft
 
*Kinetic Transfer: Shaft Couplings
 
*Control Electronics: Computer, Microcontroller, Stepper Driver
 
*Control Software: Gctrl (Gcode Streamer), GRBL (Gcode Interpreter)

Latest revision as of 03:03, 19 May 2012

Performance

  • X Axis Travel = under 225mm
  • Y Axis Travel = under 225mm
  • Z Axis Travel = under 120mm
  • Step Motor Resolution = 1.8 degrees per step
  • Accuracy = +/- 5%
  • Step Motor Torque = XXkg-cm at 12VDC
  • Spindle Speed = 1050Kv
  • Repeatability Goal: +/- 0.01mm
  • Nominal Milling Speed (Copper on FR-4):

Design

  • Major Frame Type: Mobile Gantry
  • Minor Frame Type: Blocks on Plate, Double Drive X Axis
  • Axis Drive: Step Motor
  • Rotary-to-Linear: Ultra-smooth Threaded Rod and Wear-compensating Nut
  • Anti-Friction: Bronze Sleeve Bearings
  • Axis Supports: Precision Stainless Steel Shafts with Holding Collars
  • Working Platform: Magnets and Reference Holes on Platform
  • Spindle Drive: Brushless DC Outrunner Motor
  • Spindle Shaft: Precision Stainless Steel Shaft
  • Kinetic Transfer: Shaft Couplings
  • Control Electronics: Computer, Microcontroller, Stepper Driver
  • Control Software: Gctrl (Gcode Streamer), GRBL (Gcode Interpreter)
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