diff --git a/README.md b/README.md
index c21b9ab..6e534ad 100644
--- a/README.md
+++ b/README.md
@@ -38,8 +38,8 @@ fn main() -> Result<()> {
         20.0, // Cutter length
         10.0, // Cutter diameter
         Direction::Clockwise, // Spindle rotation direction
-        20000.0, // Spindle speed (rpm)
-        5000.0, // Max feed rate/speed that the cutter will travel with (mm/min)
+        10000.0, // Spindle speed (rpm)
+        3000.0, // Max feed rate/speed that the cutter will travel with (mm/min)
     );
 
     // Get the tool context to extend the program
diff --git a/examples/planing.rs b/examples/planing.rs
index e432fe7..b6756d3 100644
--- a/examples/planing.rs
+++ b/examples/planing.rs
@@ -14,7 +14,7 @@ fn main() -> Result<()> {
         20.0,                 // Cutter length
         10.0,                 // Cutter diameter
         Direction::Clockwise, // Spindle rotation direction
-        20000.0,              // Spindle speed (rpm)
+        5000.0,               // Spindle speed (rpm)
         500.0,                // Max feed rate/speed that the cutter will travel with (mm/min)
     );
 
diff --git a/src/program.rs b/src/program.rs
index 1739425..fa5232f 100644
--- a/src/program.rs
+++ b/src/program.rs
@@ -49,6 +49,7 @@ use std::cell::RefCell;
 use std::collections::hash_map::Entry::Vacant;
 use std::collections::HashMap;
 use std::rc::Rc;
+use std::time::Duration;
 
 use anyhow::{anyhow, Result};
 use time::OffsetDateTime;
@@ -57,6 +58,7 @@ use crate::cuts::*;
 use crate::instructions::*;
 use crate::tools::*;
 use crate::types::*;
+use crate::utils::scale;
 
 /// A high level respresentation of a CNC program operation, Cut, Comment, Message, or Empty.
 #[derive(Debug, Clone)]
@@ -726,6 +728,11 @@ impl Program {
                     } else {
                         Instruction::M4(M4 {})
                     },
+                    Instruction::G4(G4 {
+                        p: Duration::from_secs(
+                            scale(tool.spindle_speed(), 0.0, 50_000.0, 3.0, 20.0) as u64,
+                        ),
+                    }),
                 ]);
 
                 // Add tool instructions