Stock definition and setup in CNC Programming - Step-by-Step Execution

Concept Flow - Stock definition and setup

Start CNC Program

↓

Define Stock Dimensions

↓

Set Stock Origin

↓

Load Stock into Machine

↓

Verify Setup

↓

Begin Machining

This flow shows how CNC programs start by defining the stock size and origin, then load it into the machine before machining.

Execution Sample

CNC Programming

G54
#100=200 (Stock length)
#101=150 (Stock width)
#102=50 (Stock height)
G0 X0 Y0 Z0 (Set origin at stock corner)

This code sets the stock size variables and defines the origin point for machining.

Execution Table

Step	Action	Variable/Command	Value/Result	Notes
1	Define stock length	#100	200	Stock length set to 200 units
2	Define stock width	#101	150	Stock width set to 150 units
3	Define stock height	#102	50	Stock height set to 50 units
4	Set origin	G54	X0 Y0 Z0	Origin set at corner of stock
5	Load stock	Machine	Stock loaded with defined size and origin	Ready for machining
6	Verify setup	Check	Stock dimensions and origin confirmed	Setup complete

💡 All stock dimensions defined and origin set; machine ready to start machining.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
#100 (Length)	undefined	200	200	200	200
#101 (Width)	undefined	undefined	150	150	150
#102 (Height)	undefined	undefined	undefined	50	50
Origin (G54)	undefined	undefined	undefined	undefined	X0 Y0 Z0

Key Moments - 2 Insights

Why do we set variables like #100, #101, #102 before starting machining?

These variables define the stock size so the machine knows the material boundaries, as shown in steps 1-3 of the execution table.

What does setting G54 with X0 Y0 Z0 mean?

It sets the origin point at the corner of the stock, so all machining coordinates are relative to this point, as in step 4.

Visual Quiz - 3 Questions

Look at the execution table, what is the value of #101 after step 2?

A 150

B 200

C 50

D undefined

💡 Hint

Check the 'Variable/Command' and 'Value/Result' columns for step 2 in the execution table.

At which step is the origin set to X0 Y0 Z0?

A Step 2

B Step 4

C Step 5

D Step 3

💡 Hint

Look for the 'Set origin' action in the execution table.

If the stock height (#102) was changed to 60, which step would reflect this?

A Step 1

B Step 5

C Step 3

D Step 4

💡 Hint

Stock height is defined in step 3 according to the execution table.

Concept Snapshot

Stock definition and setup in CNC:
- Define stock size with variables (#100, #101, #102)
- Set origin point with G54 (e.g., X0 Y0 Z0)
- Load stock into machine
- Verify dimensions and origin before machining
- Ensures machining is within material boundaries

Full Transcript

In CNC programming, the first step is to define the stock size by setting variables for length, width, and height. Then, the origin point is set using G54 coordinates, usually at the stock corner. After loading the stock into the machine, the setup is verified to ensure all dimensions and origin are correct. This process ensures the machine knows the material boundaries and where to start machining safely.