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Heidenhain Cycle 10: Pocketing with Adaptive Feed

CNC Heidenhain

Goal -- WPM

Ready
Exercise Algorithm Area
1program AdaptivePocketing
2
3const MAX_FEED_RATE = 1000.0
4const MIN_FEED_RATE = 50.0
5const TARGET_CHIP_LOAD = 0.1
6const TOOL_DIAMETER = 10.0
7const TOOL_RADIUS = TOOL_DIAMETER / 2.0
8
9type Point struct {
10X, Y float64
11}
12
13func MainPocketCycle(pocketPoints []Point, depth float64, spindleSpeed int)
14// Validate inputs
15if len(pocketPoints) < 3 {
16Print("Error: Pocket must have at least 3 points.")
17return
18}
19if depth <= 0.0 {
20Print("Error: Depth must be positive.")
21return
22}
23if spindleSpeed <= 0 {
24Print("Warning: Spindle speed non-positive, defaulting to 1000.")
25spindleSpeed = 1000
26}
27
28Print(fmt.Sprintf("Starting adaptive pocketing cycle for depth %.2f at %d RPM.", depth, spindleSpeed))
29
30// Initialize toolpath generation
31currentPosition := pocketPoints[0]
32Print(fmt.Sprintf("Moving to start point (%.2f, %.2f)", currentPosition.X, currentPosition.Y))
33
34// Main loop for pocketing
35for i := 0; i < len(pocketPoints); i++ {
36nextPoint := pocketPoints[(i+1)%len(pocketPoints)] // Loop back to start
37
38// Calculate distance to next point
39distance := CalculateDistance(currentPosition, nextPoint)
40
41// Calculate required feed rate based on material removal simulation
42// This is a simplified model; real systems use more complex physics
43// For this example, assume feed is proportional to distance and inversely proportional to chip load
44// A more advanced version would consider material properties and tool engagement angle.
45simulatedMaterialRemoval := distance * TOOL_DIAMETER // Rough estimation
46
47// Calculate chip load - simplified: assume constant width of cut for now
48// In reality, this depends on the angle of engagement.
49// For simplicity, we'll assume a constant effective width of cut related to tool radius.
50effectiveWidthOfCut := TOOL_RADIUS * 0.8 // Assume 80% of radius engagement
51
52// Calculate target feed rate based on chip load and spindle speed
53// Feed = Chip Load * Spindle Speed * Tool Diameter (simplified formula)
54targetFeed := CalculateAdaptiveFeed(spindleSpeed, TARGET_CHIP_LOAD, effectiveWidthOfCut)
55
56// Clamp feed rate to defined limits
57actualFeed := ClampFeed(targetFeed, MIN_FEED_RATE, MAX_FEED_RATE)
58
59// Simulate cutting motion
60Print(fmt.Sprintf("Cutting from (%.2f, %.2f) to (%.2f, %.2f) at feed %.2f.",
61currentPosition.X, currentPosition.Y, nextPoint.X, nextPoint.Y, actualFeed))
62
63currentPosition = nextPoint
64}
65
66// Retract tool
67Print("Retracting tool from pocket.")
68Print("Adaptive pocketing cycle completed.")
69end func
70
71func CalculateDistance(p1, p2 Point) float64 {
72dx := p2.X - p1.X
73dy := p2.Y - p1.Y
74return math.Sqrt(dx*dx + dy*dy)
75end func
76
77func CalculateAdaptiveFeed(spindleSpeed int, targetChipLoad float64, effectiveWidth float64) float64 {
78// Simplified feed calculation: Feed = Chip Load * Spindle Speed * Tool Diameter (or effective width)
79// This formula is a common starting point but needs refinement for real-world use.
80// The 'effectiveWidth' is a proxy for material engagement.
81if effectiveWidth <= 0 {
82return MIN_FEED_RATE // Prevent division by zero or invalid calculation
83}
84// A more accurate model would involve material properties and cutter geometry.
85// For this example, we'll use a direct proportionality.
86calculatedFeed := targetChipLoad * float64(spindleSpeed) * effectiveWidth
87return calculatedFeed
88end func
89
90func ClampFeed(feed, minFeed, maxFeed float64) float64 {
91if feed < minFeed {
92return minFeed
93}
94if feed > maxFeed {
95return maxFeed
96}
97return feed
98end func
99
100func Print(message string)
101// Simulate message output
102// fmt.Println(message) // Uncomment for actual console output
103end func
104
105// Helper for math functions, assume imported
106import "math"
107
108end program
Algorithm description viewbox

Heidenhain Cycle 10: Pocketing with Adaptive Feed

Algorithm description:

This program simulates an adaptive pocket machining cycle for CNC. It calculates a dynamic feed rate based on a target chip load and estimated material engagement, ensuring optimal cutting performance and tool life. The cycle iterates through pocket boundary points, adjusting feed for each segment. It also includes basic input validation and clamps the feed rate within defined limits. This approach is crucial for efficient machining of complex shapes and varying material densities.

Algorithm explanation:

The algorithm implements adaptive feed control within a pocket machining context. The `MainPocketCycle` function orchestrates the process, validating input parameters like pocket points, depth, and spindle speed. It then iterates through the pocket's vertices, calculating the distance to the next point. For each segment, it estimates material engagement and uses the `CalculateAdaptiveFeed` helper to determine a feed rate that aims for a `TARGET_CHIP_LOAD`. The `ClampFeed` function ensures the calculated feed stays within safe `MIN_FEED_RATE` and `MAX_FEED_RATE` limits. This adaptive strategy prevents tool breakage from excessive load and maintains efficiency by not undercutting. Time complexity is O(N), where N is the number of pocket points, due to the loop. Space complexity is O(1) as it uses a fixed number of variables.

Pseudocode:

PROGRAM AdaptivePocketing
  CONST MAX_FEED_RATE, MIN_FEED_RATE, TARGET_CHIP_LOAD, TOOL_DIAMETER, TOOL_RADIUS
  TYPE Point { X, Y }

  FUNCTION MainPocketCycle(pocketPoints, depth, spindleSpeed)
    VALIDATE pocketPoints, depth, spindleSpeed
    currentPosition = pocketPoints[0]
    PRINT "Moving to start point"

    FOR i FROM 0 TO len(pocketPoints) - 1
      nextPoint = pocketPoints[(i+1) % len(pocketPoints)]
      distance = CalculateDistance(currentPosition, nextPoint)
      effectiveWidthOfCut = TOOL_RADIUS * 0.8
      targetFeed = CalculateAdaptiveFeed(spindleSpeed, TARGET_CHIP_LOAD, effectiveWidthOfCut)
      actualFeed = ClampFeed(targetFeed, MIN_FEED_RATE, MAX_FEED_RATE)
      PRINT "Cutting from " + currentPosition + " to " + nextPoint + " at feed " + actualFeed
      currentPosition = nextPoint
    END FOR

    PRINT "Retracting tool."
    PRINT "Adaptive pocketing cycle completed."
  END FUNCTION

  FUNCTION CalculateDistance(p1, p2)
    RETURN sqrt((p2.X - p1.X)^2 + (p2.Y - p1.Y)^2)
  END FUNCTION

  FUNCTION CalculateAdaptiveFeed(spindleSpeed, targetChipLoad, effectiveWidth)
    IF effectiveWidth <= 0 THEN RETURN MIN_FEED_RATE
    RETURN targetChipLoad * spindleSpeed * effectiveWidth
  END FUNCTION

  FUNCTION ClampFeed(feed, minFeed, maxFeed)
    IF feed < minFeed THEN RETURN minFeed
    IF feed > maxFeed THEN RETURN maxFeed
    RETURN feed
  END FUNCTION

  FUNCTION Print(message)
    // Simulate message output
  END FUNCTION
END PROGRAM