Development News

Development News

 At DCPL's new maker space, motto is "if you build it, they will build it"

Tools

Actually, stuff all over the new "maker space" in a small room at the Martin Luther King Jr Memorial Library downtown is emblazoned with "We break it better." But the motto really ought to be different.
Not that folks aren't going to be allowed to break things. With a complement of power tools, 3D printers and actually-kinda-dangerous machinery, the "fab lab" is soon to be open to the public so that anyone with a library card--under supervision and with appropriate training--can use DCPL's tools to design prototypes, invent products or just get their hands dirty.

A few hundred people have taken a general safety orientation for the fab lab (sign up here). Unfortunately, the general orientation is just step 1: interested "makers" have to then sign up for an individual orientation for each machine they'd like to use, and those orientations aren't yet being offered. (The library is "on the verge" of being able to offer those classes, says Joseph Koivisto, a library associate within the library's Digital Commons division, so folks should stay tuned.)Still, the investment is not insignificant, and the logistical hurdles are soon to be overcome.Koivisto showed Elevation DC around last week.

                               These dinosaurs were cut out of cardboard with the library's laser cutter.....

Some of the tools you can use include CNC routers - The Handibot and Roland MDX-40 are similar products - both are considered CNC routers, or in other words, machines that take a digital design and cut shapes into wood or plastic. The Roland is a bit more "professional" (and expensive). To get access to a Roland at a normal prototyping shop usually costs a thousand dollars, Koivisto says. "We're letting people use it for free."
What would you make with one of these? Think wooden puzzles, signs, or just designs engraved onto wood.

A laser cutter, with a laser powerful enough to etch glass, stone, wood or metal (or cut all the way through paper or cardboard) is useful for making high-precision designs or just these dinosaurs.
Around the same time DCPL also unveiled its Studio Lab, which contains pro-level audio and video equipment. (And an electronic drum-kit, complete with 3D printed drumsticks.) "You could conduct a full broadcast in here," Koivisto says of the video room equipped with cameras, a green screen, microphones and lighting. The Washington City Paper rightly pointed out that some of this equipment is less useful if you don't have a sound engineer or a helpful cinematographer. But if you're just messing around--or if you're a teenager with limited resources anyway--the lab is a welcome resource.
"People always rise to the occasion," Koivisto says. "I guarantee you every one of these rooms will be booked."
A wire bender could be used for art projects or robot parts.

Multiple 3-D printers - to turn any 3-D design into reality. 

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CNC Router Machine

CNC Machines 

1. What is a Cnc Machine ?

• CNC computer and numeric control

Conventionally, an operator decides and adjusts various machines parameters like feed, depth of cut etc depending  on types of job, and controls the slide movements by hand. In a cnc machine function and slide movements are controlled by motors using computer programs.

For a CNC machine control unit (MCU) decides cutting speed, feed, depth of cut,tool selection, coolant on off and tool paths. The MCU  issues commands in form of numeric data to motor that position slides and tool accordingly.

Basic Model of CNC Router Machine 

CNC Machines Advantages and Disadvantages 

Advantages 

• High Repeatably and Precision eg. Aircraft  Parts.
• Volume of Production is Very High.
• Complex Contours/Surfaces Need To Be Machined. eg Turbines 
• Flexibility In Job Change, Automatic Tool Settings, less Scrap
• More Safe, Higher Productivity, Better Quality
• Less Paper Work, Faster Prototype Production ,Reduction  In Lead Times

Disadvantages 

• Costly Setup, Skilled Operators
• Computers, Programming Knowledge Required
• Maintenance is difficult.

Open loop and Closed loop control

• In open loop system (a) the slide may overshoot or may not reach desired position because of inertia, wear and tear and friction,hence inaccurate machining.
• In closed loop systems (b) the position sensors are used to correct slide movements and achieve  higher accuracy and repeatabillty.

Table of cnc router machine

CNC programming.

• Important thing to know:  Programming consists of a series of instruction in form of letter code
• Coodinate System     
• Units, Incremental or Absolute Positioning.
• Coordinates: X,Y,Z,RX,RY,RZ 
• Feed Rate and Spindle Speed. 
• Coolant control: on/off,flood, mist
• Tool control: tool and tool parameters

Programming consists of a series of a series of instruction in form of letter codes

preparatory codes:

• G codes- Initial machine setup and establishing aperating conditions.
• N codes- specify program line number to executed by the MUC

Axis codes: X,Y,Z.

• used to specify motion of the slide along  X,Y,Z direction

Feed and Speed Codes:  F and C specify feed and spindle speed

Tool Codes: T- specify tool number

Miscellaneous Codes:-M codes For coolant control and other activities.

RULES FOR PROGRAMMING

Block format

N135 G01 X1.0 Y1.0 Z0.125F5

Sample Block..

• Restrictions on CNC blocks
• Each may contain only one tool move
• Each may contain any number of non-tool-move g-codes
• Each may contain only one feed rate
• Each may contain only one specified tool or spindle speed 
• The block number should be sequential
• Both the program start flag and the program number must be 
• Independent of all other commands ( on separate lines )
• The data within  a block should follow the sequence shown in the above sample block

Explanation of commonly used G codes 

• G00-preparatory code to control final position of the tool and not concerned with the path that is followed in arriving at the final destination.

• G01-Tool is required to move in a staight line connecting current position and final position.used for tool movement without any machining point control.(linear interpolation)

• G02-Tool path followed is long an arc specified by I, J and k codes (circular interpolation)

 Table of Important G and M codes

G00 Rapid Transverse                                                

G01 Linear Interpolation
G02 Circular Interpolation, CW
G03 circular Interpolation, CCW
G17 XY plane, G18 XZ plane, G19 Xz plane
G20/G70 inch units
G21/G71 Metric units
G40 cutter compensation cancel
G41 cutter compensation left
G42 cutter compensation right
G43 Total length compensation (plus)
G44 Total length Compensation (plus)
G49 Tool Length compensation (minus)
G80 cancel canned cycle
G81 Drilling cycle
G82 counter boring cycle
G83 Deep hole drilling cycle
G90 Absolute Postioning
G91 Incremental Positioning

M00 Program Stop
M01 Optional Program stop
M02 program end
M03 spindle on clockwise
M08 Coolant on
M09 Coolant off
M04 spindle on conter clockwise
M05 spindle stop
M06 Tool Change
M10 clamps on
M11 clamps off
M30 Program stop, reset to start.

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Suba Tech Trading LLC

CNC Router, Laser and plasma Machine,

website : www.subauae.com
post by : Irfan khan