Difference between revisions of "CNC - Root2CNC"

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(=Plastic)
 
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|model=Root2 v1
 
|model=Root2 v1
 
|arrived=November 2016
 
|arrived=November 2016
|doesitwork=Yes , still undergoing commissioning activities
+
|doesitwork=Yes
|contact=Bret Lanius
+
|contact = Bret
 
|where=Classroom area
 
|where=Classroom area
 
}}
 
}}
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== Info ==
 
== Info ==
We have a Root2CNC desktop CNC mill courtesy of work and contributions from Bret Lanius, Dan Odom, Tanju Bayramoglu, and others.  The project is being led by Bret.   
+
We have a Root2CNC desktop CNC mill courtesy of work and contributions from [[User:Bret |Bret Lanius]], Dan Odom, [[User:Tanju |Tanju Bayramoglu]], and others.  The project is being led by Bret.   
  
  
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'''General Specs'''
 
'''General Specs'''
* Single print nozzle/Single color
+
* 1/8" Spindle max rpm of 12000
 
* Material: Wood types, Plastic types
 
* Material: Wood types, Plastic types
* Build Dimensions:  152mm x 152mm x 158mm (6in x 6in x 6.2in)
+
* Build Dimensions:  approximately 10x11 inches
 
* Spindle z-axis range:  
 
* Spindle z-axis range:  
* Multi-Software Compatible: Freedom to use any number of CAD/CAM software programs
+
* Control software is [http://www.estlcam.com/estlcam.php Estlcam]
* Operating Ranges
 
  
 +
Uses Grbl Shield with the following Pinout
 +
[[File:Grbl_Pin_Diagram_v0.9+.png]]
  
 
== Permissions ==  
 
== Permissions ==  
* RESTRICTED - must consult with Bret Lanius prior to operation until the Root2 is fully commissioned
+
* '''RESTRICTED''' - must consult with Bret Lanius prior to operation
 +
 
 +
* Longer term, the Root2CNC will be access control limited to people that have completed basic training
  
 
== Restrictions ==
 
== Restrictions ==
  
* Discouraged Materials: plastics of unknown composition
+
'''Discouraged Materials:'''
 +
* Plastics of unknown composition
 +
* Aluminum - requires advanced operational knowledge
 +
* Steel - not allowed
 +
* Titanium - not allowed
 +
* Brass
 +
* Bronze
 +
* Copper - limited to PCB etching, requires advanced operational knowledge
  
  
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[[File:.JPG|400px|right]]
 
[[File:.JPG|400px|right]]
 +
 
== Basic Instructions ==
 
== Basic Instructions ==
...
+
Successful Milling is all about '''''Speeds'' and ''Feeds'''''
 +
 
 +
'''''Speeds''''' refers to your spindle speed in rpm. <br>
 +
In a series of experiments performed early on in machining, it was determined that spindle speed is the biggest determiner of tool's life.<br>
 +
Running too fast generates excess heat (there are others ways to generate heat too), which softens the tool and ultimately allows the edge to dull.
 +
 
 +
'''''Feeds''''' refers to the feedrate, in linear mm per minute.<br>
 +
Feedrate is all about the tradeoff between maximizing the material removal rate. Material removal rate is how fast in cubic units the mill is making chips--the faster the better for most machinists, right up until it creates problems.<br>
 +
The most common problem is tool breakage or chipping when you feed too quickly.
 +
 
 +
Simply being a noob and playing it safe by "''running the machine super slow''" is not acceptable.  Must take the time to learn about feeds and speeds.<br>
 +
examples of what can happen if machine is run too slowly:
 +
* If you reduce your spindle speed too much relative to the feedrate, you're forcing the flutes of your cutter to take of too much material. The endmill is being pushed too fast into the cut and the chips get too big. You can easily break a cutter this way.
 +
 
 +
* If you reduce your feedrate too much relative to spindle speed, you will soon cause your cutter flutes to start "rubbing" or "burnishing" the workpiece instead of shearing or cutting chips. Many machinists will tell you the fastest way to dull a cutter is just to run it with the spindle reversed and make a pass, but having too slow a feedrate creates a similar effect. Running too slow is just as hard on spindle cutters as running too fast, if not harder.
  
 
===Wood===
 
===Wood===
Line 53: Line 78:
  
 
===Plastic===
 
===Plastic===
''' Plexiglass Acrylic:'''  Plexiglass is xxxx, readily available and can be found at local hardware stores and online
+
''' Plexiglass Acrylic:'''  Plexiglass is xxxx, readily available and can be found at local hardware stores and online.
 +
 
 
* Brittle
 
* Brittle
*
+
* Cast Acrylic is best for routing and has paper covering
 +
* Extruded Acrylic has plastic covering
  
 
'''Lexan Polycarbonate''' Lexan is xxx, it can sometimes be found at local hardware stores
 
'''Lexan Polycarbonate''' Lexan is xxx, it can sometimes be found at local hardware stores
Line 95: Line 122:
  
 
== References ==
 
== References ==
 +
* [http://www.shapeoko.com/wiki/index.php/Materials Shapeoko Materials Speeds & Feeds Guide]
 +
* [http://www.cnccookbook.com/CCCNCMillFeedsSpeedsBasics.htm CNC Cookbook: Speeds and Feeds]
 
* [http://www.datron.com/blog/acrylic-cutting-tools-milling-acrylic/ Acrylic/Plexiglass Machining]
 
* [http://www.datron.com/blog/acrylic-cutting-tools-milling-acrylic/ Acrylic/Plexiglass Machining]
 
* [http://www.boedeker.com/fabtip.htm Guide to Plastics Machining]
 
* [http://www.boedeker.com/fabtip.htm Guide to Plastics Machining]
 
* [http://www.practicalmachinist.com/vb/cnc-machining/references-milling-cutting-speeds-plastics-285808/?s=e21ff74d44b962bdccada07608b0af4f#post2304231 Practical Machinist Form Post]
 
* [http://www.practicalmachinist.com/vb/cnc-machining/references-milling-cutting-speeds-plastics-285808/?s=e21ff74d44b962bdccada07608b0af4f#post2304231 Practical Machinist Form Post]

Latest revision as of 09:29, 1 November 2017

Back to list of Equipment


  • Owner/Loaner: MakerStation
  • Serial Number: N/A
  • Make/Model: Root2 v1
  • Arrival Date: November 2016
  • Usability: {{{usagerestrictions}}}
  • Contact: Bret
  • Where: Classroom area



Info

We have a Root2CNC desktop CNC mill courtesy of work and contributions from Bret Lanius, Dan Odom, Tanju Bayramoglu, and others. The project is being led by Bret.


File:.jpg
500px


General Specs

  • 1/8" Spindle max rpm of 12000
  • Material: Wood types, Plastic types
  • Build Dimensions: approximately 10x11 inches
  • Spindle z-axis range:
  • Control software is Estlcam

Uses Grbl Shield with the following Pinout Grbl Pin Diagram v0.9+.png

Permissions

  • RESTRICTED - must consult with Bret Lanius prior to operation
  • Longer term, the Root2CNC will be access control limited to people that have completed basic training

Restrictions

Discouraged Materials:

  • Plastics of unknown composition
  • Aluminum - requires advanced operational knowledge
  • Steel - not allowed
  • Titanium - not allowed
  • Brass
  • Bronze
  • Copper - limited to PCB etching, requires advanced operational knowledge



Basic Instructions

Successful Milling is all about Speeds and Feeds

Speeds refers to your spindle speed in rpm.
In a series of experiments performed early on in machining, it was determined that spindle speed is the biggest determiner of tool's life.
Running too fast generates excess heat (there are others ways to generate heat too), which softens the tool and ultimately allows the edge to dull.

Feeds refers to the feedrate, in linear mm per minute.
Feedrate is all about the tradeoff between maximizing the material removal rate. Material removal rate is how fast in cubic units the mill is making chips--the faster the better for most machinists, right up until it creates problems.
The most common problem is tool breakage or chipping when you feed too quickly.

Simply being a noob and playing it safe by "running the machine super slow" is not acceptable. Must take the time to learn about feeds and speeds.
examples of what can happen if machine is run too slowly:

  • If you reduce your spindle speed too much relative to the feedrate, you're forcing the flutes of your cutter to take of too much material. The endmill is being pushed too fast into the cut and the chips get too big. You can easily break a cutter this way.
  • If you reduce your feedrate too much relative to spindle speed, you will soon cause your cutter flutes to start "rubbing" or "burnishing" the workpiece instead of shearing or cutting chips. Many machinists will tell you the fastest way to dull a cutter is just to run it with the spindle reversed and make a pass, but having too slow a feedrate creates a similar effect. Running too slow is just as hard on spindle cutters as running too fast, if not harder.

Wood

Milling Soft Woods: Popular softwoods include pine, ...

Milling Hard Woods: Oak, ...

Plastic

Plexiglass Acrylic: Plexiglass is xxxx, readily available and can be found at local hardware stores and online.

  • Brittle
  • Cast Acrylic is best for routing and has paper covering
  • Extruded Acrylic has plastic covering

Lexan Polycarbonate Lexan is xxx, it can sometimes be found at local hardware stores

Foam

Circuit Boards

Circuit Board Milling

Advanced Operational Knowledge

There are some more advanced tasks that not everyone needs to know to print, but needs to know to troubleshoot:

Warnings

  • Keep loose hair and sleeves away from all moving parts.
  • Dust control
  • Avoid inhaling dusts generated from milling operations


Safety

  • Keep loose hair and sleeves away from all moving parts.
  • Do not touch
  • Dust
  • Material Safety Data Sheets
  • Root2CNC is not intended for:
    • (A) Beginners
    • (B) Cutting, milling, engraving metals
    • (C)

References