Rest machining for remaining material in CNC Programming - Step-by-Step Execution

Concept Flow - Rest machining for remaining material

Start rough machining

↓

Remove most material

↓

Check remaining material

↓

If remaining material > threshold?

No→Finish machining

Yes↓

Perform rest machining

↓

Finish machining

The process starts with rough machining to remove most material, then checks for leftover material. If leftover is above a set limit, rest machining removes it before finishing.

Execution Sample

CNC Programming

G90 G54
Milling rough pass
Check leftover material
If leftover > 0.5mm
  Perform rest machining
End

This CNC program rough machines the part, checks leftover material, and performs rest machining if leftover is more than 0.5mm.

Execution Table

Step	Action	Remaining Material (mm)	Condition	Next Action
1	Start rough machining	10.0	N/A	Remove material
2	After rough pass	0.8	0.8 > 0.5	Perform rest machining
3	Rest machining pass	0.3	0.3 > 0.5	No, finish machining
4	Finish machining	0.3	N/A	End program

💡 Remaining material 0.3mm is less than threshold 0.5mm, so machining finishes.

Variable Tracker

Variable	Start	After Rough Pass	After Rest Pass	Final
Remaining Material (mm)	10.0	0.8	0.3	0.3

Key Moments - 2 Insights

Why do we check the remaining material after rough machining?

Because rough machining removes most material but leaves some behind; checking ensures rest machining only runs if leftover is significant, as shown in execution_table step 2.

What happens if the remaining material is less than the threshold?

The program skips rest machining and finishes, as seen in execution_table step 3 where 0.3mm < 0.5mm.

Visual Quiz - 3 Questions

Look at the execution table, what is the remaining material after the rough pass?

A 10.0 mm

B 0.8 mm

C 0.3 mm

D 0.5 mm

💡 Hint

Check the 'Remaining Material' column at step 2 in the execution_table.

At which step does the program decide to perform rest machining?

A Step 2

B Step 1

C Step 3

D Step 4

💡 Hint

Look at the 'Condition' and 'Next Action' columns in execution_table step 2.

If the leftover threshold changed to 0.2 mm, what would happen at step 3?

A Program would restart rough machining

B Machining would finish

C Rest machining would run again

D Program would stop with error

💡 Hint

Compare leftover 0.3 mm with new threshold 0.2 mm in execution_table step 3.

Concept Snapshot

Rest machining removes leftover material after rough machining.
Check leftover material after rough pass.
If leftover > threshold, run rest machining.
Otherwise, finish machining.
This ensures precision and efficiency.

Full Transcript

Rest machining for remaining material starts with rough machining to remove most of the stock. After rough machining, the program checks how much material is left. If the leftover material is more than a set threshold, rest machining is performed to clean up the remaining material. If leftover is less than the threshold, machining finishes. This process ensures the part is machined precisely without unnecessary passes. The execution table shows leftover material starting at 10 mm, reduced to 0.8 mm after rough machining, which triggers rest machining. After rest machining, leftover is 0.3 mm, less than the 0.5 mm threshold, so machining ends.