Learning Outcome

Explore the CNC-milling machine to build something 'BIG'.

One thing stood out this week - understanding CNC machines along with crafting toolpaths through VCarve. Materials came up next, including MDF, MDO, OSB, hardwood, plus plywood, each bringing its own traits. Cutting tools entered the picture, followed by adjustments in feed rate and spindle speed depending on what was being machined. Fixturing methods showed up during demos, alongside details on kerf cuts and living hinges. Joinery approaches got attention, while safety rules stayed central throughout every session.
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Introduction to Numerical Control on a Computer (CNC Machine)
CNC machines, developed through advanced engineering, are among the most essential industrial tools globally. Manufacturers utilize CNC machines due to their fascination with the way programmed instructions execute on various materials. The system involves an automated process of cutting and shaping, and the precise drilling of components reflects the industry’s idea of the connection between digital logic and physical production. The excellent and efficient CNC technology contains various elements of manufacturing, such as precision and repeatability, as well as the principles, for instance, efficiency and consistency. These systems operate based on a set of coordinates and commands, allowing for intricate designs and consistent results. Engineering experts used numerous elements of technology in CNC machines, for instance, programmed instructions to represent accuracy, stability, and control. CNC technology has revolutionized manufacturing by enabling high precision, repeatability, and efficiency in producing complex parts and products across industries such as aerospace, automotive, and woodworking. The implementation of this technology implies the elements and principles of manufacturing such as precision and efficiency, making it have an essential role in modern production.
Forest CNC Router
The Forest CNC Router, located at Vigyan Ashram, is among the most versatile machines globally. The facility utilizes the Forest CNC Router due to its reputation for stability and its powerful spindle. The device involves a construction made in the USA, and the precise functionality of the router reflects the technical connection between engineering and fabrication. The excellent and robust Forest CNC Router contains various technical features, such as an emergency switch and a dust collector, as well as capabilities for group and individual assignments. Click here to see more details about the machine. Click here for more details.
Features
High Precision Cutting – The machine provides accurate and smooth cutting on different materials.
Strong Build Quality – It has a sturdy frame that makes the machine stable and durable.
Powerful Spindle Motor – The spindle is strong enough to cut materials like wood, acrylic, and aluminum.
Computer-Controlled Operation – The machine works with G-code for accurate and automated cutting.
Easy to Use – The software interface is simple, so beginners can also operate it easily.
Safety Features – The machine includes emergency stop buttons for safety.
Dust Collection System – It helps keep the workspace clean while cutting.
Multiple Tool Support – Different tool bits can be used for cutting and engraving.

Router Specifications

Construction and Frame
Material: Heavy-duty steel or cast iron
Table Size: 2’×3’ to 5’×10’ or larger
Frame Type: Welded and reinforced for vibration resistance
Spindle
Power: 2.2 kW to 12 kW
Speed: 6,000 to 24,000 RPM
Cooling System: Air-cooled or water-cooled
Motion System (Axes)
Number of Axes: 3-axis (X, Y, Z), optional 4th-axis (rotary)
Movement Mechanism: Ball screws or rack & pinion drive
Resolution: 0.01 mm or better
Controller & Software
Controller Type: Dedicated CNC or PC-based
Software Compatibility: AutoCAD, SolidWorks, VCarve, Fusion 360, Aspire
User Interface: Touch screen or handheld pendant
Cutting Area
Standard Dimensions: 4’×8’ or custom sizes available
Z-Axis Travel: Up to 12 inches
Additional Features
Automatic Tool Changer (ATC): Available in higher-end models
Dust Collection System: Built-in for a clean workspace
Material Compatibility: Wood, plastics, composites, aluminum, foam, and more
Safety Features: Emergency stop button, limit switches, and protective enclosures.
source from chat gpt

Machine Safety Requirements

1) allwayas fallow the mechine guidelines and instructions.
2) wear safety glasses and ear protection.
3) without proper training do not operate the machine.
4) always on mechine any supervision is required
5) learn emgency stop button and how to use it.
6) while opering mechien do not put on any thing on working area aslo do not put your hand on working area.
7) make sure the material is properly secured before starting the machine.
8) when your tired do not operate the machine.
9) Allways use proper cutting tools and make sure they are in good condition.
10) Before mechien is start turn on the dust collection system.
11) After using the machine clean the work area and turn off the dust collection system.
12) maintin the distance from the machine while it is operating.
13) do not wear loose clothing while operating the machine.



Tools
We use different tools for cutting and fixturing in the CNC machine. For cutting, we use end mill bits, and for fixing the material we use clamps. In our lab, we use two types of clamps: C-clamps and T-track hold-down clamps to hold the material firmly on the table. For milling operations, we use a 6 mm diameter milling bit. To tighten and securely hold the milling bit in the spindle, we use a spanner.

Diffrence betwwen Milling bit and drilling bit
Milling bits are designed for cutting and shaping materials, while drilling bits are specifically made for creating holes. Milling bits have cutting edges on the sides and can remove material in various directions, whereas drilling bits have a pointed tip and are primarily used for vertical drilling. Milling bits can be used for a wide range of applications, including contouring, slotting, and engraving, while drilling bits are mainly used for creating holes of specific diameters. Additionally, milling bits often have multiple flutes for efficient material removal, while drilling bits typically have two flutes for better chip evacuation during hole creation.

Source Image : End Mill vs Drill Bit

Group Assignment

• do your lab's safety training
• test runout, alignment, fixturing, speeds, feeds, materials,and toolpaths for your machine
In this group assignment, we learned how to use a CNC router step by step and understood the important safety rules while operating the machine. We also performed test cuts using 12 mm and 18 mm plywood to make a press-fit job. During the process, we learned how to secure the workpiece properly using clamps on the CNC bed. We also learned how to install and tighten the end mill bit using a spanner before starting the machining process. setep the toolpath in VCarve and adjusted the feed rate and spindle speed according to the material being cut.
step 1:- We started by securing the plywood on the CNC bed using clamps to ensure it was firmly in place for cutting.

step 2:- Next, we installed the end mill bit into the spindle and tightened it securely using a spanner to ensure it would not come loose during operation.

step 3:- wr are check the all mechine switch and emergency stop button before starting the machine.

step 4 :- For the cutiing process we need a file so we design the teeth-solt file in soldiworks and converted in dxf this file use for cutting the plywood.

Click here to read more about our Group Assignment.