diff --git a/bobassembly/changelog.txt b/bobassembly/changelog.txt
index b5d8e7de9..d6d2294f4 100644
--- a/bobassembly/changelog.txt
+++ b/bobassembly/changelog.txt
@@ -3,6 +3,7 @@ Version: 1.3.0
 Date: ???
   Changes:
     - Code tidy: Remove unnecessary global variables #178
+    - Improved Assembling Machine tier progression #179
 ---------------------------------------------------------------------------------------------------
 Version: 1.2.2
 Date: 21. 02. 2024
diff --git a/bobassembly/prototypes/assembly-electronics-updates.lua b/bobassembly/prototypes/assembly-electronics-updates.lua
index 1f3791ece..1d4503249 100644
--- a/bobassembly/prototypes/assembly-electronics-updates.lua
+++ b/bobassembly/prototypes/assembly-electronics-updates.lua
@@ -16,11 +16,9 @@ if settings.startup["bobmods-assembly-electronicmachines"].value == true then
   if data.raw.item["titanium-plate"] then
     bobmods.lib.recipe.replace_ingredient("electronics-machine-3", "steel-plate", "titanium-plate")
     bobmods.lib.tech.add_prerequisite("electronics-machine-3", "titanium-processing")
-  else
-    if data.raw.item["tungsten-plate"] then
-      bobmods.lib.recipe.replace_ingredient("electronics-machine-3", "steel-plate", "tungsten-plate")
-      bobmods.lib.tech.add_prerequisite("electronics-machine-3", "tungsten-processing")
-    end
+  elseif data.raw.item["tungsten-plate"] then
+    bobmods.lib.recipe.replace_ingredient("electronics-machine-3", "steel-plate", "tungsten-plate")
+    bobmods.lib.tech.add_prerequisite("electronics-machine-3", "tungsten-processing")
   end
 
   if data.raw.item["titanium-bearing"] then
@@ -32,11 +30,9 @@ if settings.startup["bobmods-assembly-electronicmachines"].value == true then
   if data.raw.item["titanium-gear-wheel"] then
     bobmods.lib.recipe.replace_ingredient("electronics-machine-3", "iron-gear-wheel", "titanium-gear-wheel")
     bobmods.lib.tech.add_prerequisite("electronics-machine-3", "titanium-processing")
-  else
-    if data.raw.item["tungsten-gear-wheel"] then
-      bobmods.lib.recipe.replace_ingredient("electronics-machine-3", "iron-gear-wheel", "tungsten-gear-wheel")
-      bobmods.lib.tech.add_prerequisite("electronics-machine-3", "tungsten-processing")
-    end
+  elseif data.raw.item["tungsten-gear-wheel"] then
+    bobmods.lib.recipe.replace_ingredient("electronics-machine-3", "iron-gear-wheel", "tungsten-gear-wheel")
+    bobmods.lib.tech.add_prerequisite("electronics-machine-3", "tungsten-processing")
   end
 
   -- add new electronics crafting categories
@@ -59,9 +55,14 @@ if settings.startup["bobmods-assembly-electronicmachines"].value == true then
   data.raw.recipe["electronic-circuit"].category = "electronics"
   data.raw.recipe["advanced-circuit"].category = "electronics"
   data.raw.recipe["processing-unit"].category = "electronics-machine"
+  
   if data.raw.recipe["advanced-processing-unit"] then
     data.raw.recipe["advanced-processing-unit"].category = "electronics-machine"
   end
+  if data.raw.item["advanced-processing-unit"] then
+    bobmods.lib.recipe.replace_ingredient("electronics-machine-3", "processing-unit", "advanced-processing-unit")
+    bobmods.lib.tech.add_prerequisite("electronics-machine-3", "advanced-electronics-3")
+  end
 
   if settings.startup["bobmods-assembly-limits"].value == true then
     data.raw["assembling-machine"]["electronics-machine-1"].ingredient_count = 3
diff --git a/bobassembly/prototypes/assembly-electronics.lua b/bobassembly/prototypes/assembly-electronics.lua
index dc577ce3c..1e9bc57a9 100644
--- a/bobassembly/prototypes/assembly-electronics.lua
+++ b/bobassembly/prototypes/assembly-electronics.lua
@@ -166,7 +166,7 @@ if settings.startup["bobmods-assembly-electronicmachines"].value == true then
         ingredients = {
           { "automation-science-pack", 1 },
         },
-        time = 15,
+        time = 10,
       },
       order = "a-c-a",
     },
@@ -330,13 +330,15 @@ if settings.startup["bobmods-assembly-electronicmachines"].value == true then
         "electronics-machine-1",
         "steel-processing",
         "advanced-electronics",
+        "chemical-science-pack",
       },
       unit = {
-        count = 50,
+        count = 80,
         time = 30,
         ingredients = {
           { "automation-science-pack", 1 },
           { "logistic-science-pack", 1 },
+          { "chemical-science-pack", 1 },
         },
       },
       order = "a-c-b",
@@ -500,15 +502,17 @@ if settings.startup["bobmods-assembly-electronicmachines"].value == true then
         "electronics-machine-2",
         "advanced-electronics-2",
         "production-science-pack",
+        "utility-science-pack",
       },
       unit = {
-        count = 100,
-        time = 45,
+        count = 140,
+        time = 60,
         ingredients = {
           { "automation-science-pack", 1 },
           { "logistic-science-pack", 1 },
           { "chemical-science-pack", 1 },
           { "production-science-pack", 1 },
+          { "utility-science-pack", 1 },
         },
       },
       order = "a-c-c",
diff --git a/bobassembly/prototypes/assembly-updates.lua b/bobassembly/prototypes/assembly-updates.lua
index 93c8f0c3d..af0fd7102 100644
--- a/bobassembly/prototypes/assembly-updates.lua
+++ b/bobassembly/prototypes/assembly-updates.lua
@@ -2,10 +2,17 @@ data.raw.technology["automation-2"].prerequisites = { "automation", "electronics
 bobmods.lib.tech.add_prerequisite("automation-2", "steel-processing")
 bobmods.lib.tech.add_prerequisite("automation-2", "logistic-science-pack")
 
-data.raw.technology["automation-3"].prerequisites = { "automation-2", "steel-processing", "advanced-electronics" }
+data.raw.technology["automation-3"].prerequisites = {
+  "automation-2",
+  "advanced-electronics",
+  "chemical-science-pack",
+}
 bobmods.lib.tech.set_science_pack_count("automation-3", 60)
-data.raw.technology["automation-3"].unit.ingredients =
-  { { "automation-science-pack", 2 }, { "logistic-science-pack", 1 } }
+data.raw.technology["automation-3"].unit.ingredients = {
+  { "automation-science-pack", 1 },
+  { "logistic-science-pack", 1 },
+  { "chemical-science-pack", 1 },
+}
 data.raw.technology["automation-3"].unit.time = 30
 
 bobmods.lib.item.set_subgroup("assembling-machine-1", "bob-assembly-machine")
@@ -16,8 +23,11 @@ data.raw["assembling-machine"]["assembling-machine-1"].energy_usage = "100kW"
 data.raw["assembling-machine"]["assembling-machine-2"].energy_usage = "135kW"
 data.raw["assembling-machine"]["assembling-machine-3"].energy_usage = "210kW"
 
-data.raw.recipe["assembling-machine-3"].ingredients =
-  { { "assembling-machine-2", 1 }, { "steel-plate", 9 }, { "advanced-circuit", 3 } }
+data.raw.recipe["assembling-machine-3"].ingredients = {
+  { "assembling-machine-2", 1 },
+  { "steel-plate", 9 },
+  { "advanced-circuit", 3 },
+}
 
 if data.raw.item["steel-gear-wheel"] then
   bobmods.lib.recipe.add_ingredient("assembling-machine-3", { "steel-gear-wheel", 5 })
@@ -31,11 +41,9 @@ data.raw["assembling-machine"]["assembling-machine-3"].next_upgrade = "assemblin
 if data.raw.item["aluminium-plate"] then
   bobmods.lib.recipe.replace_ingredient("assembling-machine-4", "steel-plate", "aluminium-plate")
   bobmods.lib.tech.add_prerequisite("automation-4", "aluminium-processing")
-else
-  if data.raw.item["brass-alloy"] then
-    bobmods.lib.recipe.replace_ingredient("assembling-machine-4", "steel-plate", "brass-alloy")
-    bobmods.lib.tech.add_prerequisite("automation-4", "zinc-processing")
-  end
+elseif data.raw.item["brass-alloy"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-4", "steel-plate", "brass-alloy")
+  bobmods.lib.tech.add_prerequisite("automation-4", "zinc-processing")
 end
 
 if data.raw.item["steel-bearing"] then
@@ -47,20 +55,16 @@ end
 if data.raw.item["brass-gear-wheel"] then
   bobmods.lib.recipe.replace_ingredient("assembling-machine-4", "iron-gear-wheel", "brass-gear-wheel")
   bobmods.lib.tech.add_prerequisite("automation-4", "zinc-processing")
-else
-  if data.raw.item["steel-gear-wheel"] then
-    bobmods.lib.recipe.replace_ingredient("assembling-machine-4", "iron-gear-wheel", "steel-gear-wheel")
-  end
+elseif data.raw.item["steel-gear-wheel"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-4", "iron-gear-wheel", "steel-gear-wheel")
 end
 
 if data.raw.item["titanium-plate"] then
   bobmods.lib.recipe.replace_ingredient("assembling-machine-5", "steel-plate", "titanium-plate")
   bobmods.lib.tech.add_prerequisite("automation-5", "titanium-processing")
-else
-  if data.raw.item["tungsten-plate"] then
-    bobmods.lib.recipe.replace_ingredient("assembling-machine-5", "steel-plate", "tungsten-plate")
-    bobmods.lib.tech.add_prerequisite("automation-5", "tungsten-processing")
-  end
+elseif data.raw.item["tungsten-plate"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-5", "steel-plate", "tungsten-plate")
+  bobmods.lib.tech.add_prerequisite("automation-5", "tungsten-processing")
 end
 
 if data.raw.item["titanium-bearing"] then
@@ -72,61 +76,49 @@ end
 if data.raw.item["titanium-gear-wheel"] then
   bobmods.lib.recipe.replace_ingredient("assembling-machine-5", "iron-gear-wheel", "titanium-gear-wheel")
   bobmods.lib.tech.add_prerequisite("automation-5", "titanium-processing")
-else
-  if data.raw.item["tungsten-gear-wheel"] then
-    bobmods.lib.recipe.replace_ingredient("assembling-machine-5", "iron-gear-wheel", "tungsten-gear-wheel")
-    bobmods.lib.tech.add_prerequisite("automation-5", "tungsten-processing")
-  end
+elseif data.raw.item["tungsten-gear-wheel"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-5", "iron-gear-wheel", "tungsten-gear-wheel")
+  bobmods.lib.tech.add_prerequisite("automation-5", "tungsten-processing")
 end
 
 if data.raw.item["nitinol-alloy"] then
   bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "steel-plate", "nitinol-alloy")
   bobmods.lib.tech.add_prerequisite("automation-6", "nitinol-processing")
-else
-  if data.raw.item["titanium-plate"] then
-    bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "steel-plate", "titanium-plate")
-    bobmods.lib.tech.add_prerequisite("automation-6", "titanium-processing")
-  end
+elseif data.raw.item["titanium-plate"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "steel-plate", "titanium-plate")
+  bobmods.lib.tech.add_prerequisite("automation-6", "titanium-processing")
 end
 
 if data.raw.item["tungsten-carbide"] then
   bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-plate", "tungsten-carbide")
   bobmods.lib.tech.add_prerequisite("automation-6", "tungsten-alloy-processing")
-else
-  if data.raw.item["tungsten-plate"] then
-    bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-plate", "tungsten-plate")
-    bobmods.lib.tech.add_prerequisite("automation-6", "tungsten-processing")
-  end
+elseif data.raw.item["tungsten-plate"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-plate", "tungsten-plate")
+  bobmods.lib.tech.add_prerequisite("automation-6", "tungsten-processing")
 end
 
 if data.raw.item["nitinol-bearing"] then
   bobmods.lib.recipe.add_ingredient("assembling-machine-6", { "nitinol-bearing", 5 })
+elseif data.raw.item["titanium-bearing"] then
+  bobmods.lib.recipe.add_ingredient("assembling-machine-6", { "titanium-bearing", 5 })
 else
-  if data.raw.item["titanium-bearing"] then
-    bobmods.lib.recipe.add_ingredient("assembling-machine-6", { "titanium-bearing", 5 })
-  else
-    bobmods.lib.recipe.add_ingredient("assembling-machine-6", { "iron-gear-wheel", 3 })
-  end
+  bobmods.lib.recipe.add_ingredient("assembling-machine-6", { "iron-gear-wheel", 3 })
 end
 
 if data.raw.item["nitinol-gear-wheel"] then
   bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-gear-wheel", "nitinol-gear-wheel")
   bobmods.lib.tech.add_prerequisite("automation-6", "nitinol-processing")
-else
-  if data.raw.item["titanium-gear-wheel"] then
-    bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-gear-wheel", "titanium-gear-wheel")
-    bobmods.lib.tech.add_prerequisite("automation-6", "titanium-processing")
-  else
-    if data.raw.item["tungsten-gear-wheel"] then
-      bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-gear-wheel", "tungsten-gear-wheel")
-      bobmods.lib.tech.add_prerequisite("automation-6", "tungsten-processing")
-    end
-  end
+elseif data.raw.item["titanium-gear-wheel"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-gear-wheel", "titanium-gear-wheel")
+  bobmods.lib.tech.add_prerequisite("automation-6", "titanium-processing")
+elseif data.raw.item["tungsten-gear-wheel"] then
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "iron-gear-wheel", "tungsten-gear-wheel")
+  bobmods.lib.tech.add_prerequisite("automation-6", "tungsten-processing")
 end
 
 if data.raw.item["advanced-processing-unit"] then
-  bobmods.lib.recipe.replace_ingredient("assembling-machine-6", "processing-unit", "advanced-processing-unit")
-  bobmods.lib.tech.add_prerequisite("automation-6", "advanced-electronics-3")
+  bobmods.lib.recipe.replace_ingredient("assembling-machine-5", "processing-unit", "advanced-processing-unit")
+  bobmods.lib.tech.add_prerequisite("automation-5", "advanced-electronics-3")
 end
 
 if settings.startup["bobmods-assembly-limits"].value == true then
diff --git a/bobassembly/prototypes/assembly.lua b/bobassembly/prototypes/assembly.lua
index 0f2691e07..4ff354fa0 100644
--- a/bobassembly/prototypes/assembly.lua
+++ b/bobassembly/prototypes/assembly.lua
@@ -112,7 +112,7 @@ data:extend({
     enabled = false,
     ingredients = {
       { "assembling-machine-3", 1 },
-      { "advanced-circuit", 3 },
+      { "processing-unit", 3 },
       { "steel-plate", 9 },
       { "iron-gear-wheel", 5 },
     },
@@ -133,14 +133,16 @@ data:extend({
     },
     prerequisites = {
       "automation-3",
-      "chemical-science-pack",
+      "advanced-electronics-2",
+      "production-science-pack",
     },
     unit = {
-      count = 80,
+      count = 100,
       ingredients = {
         { "automation-science-pack", 1 },
         { "logistic-science-pack", 1 },
         { "chemical-science-pack", 1 },
+        { "production-science-pack", 1 },
       },
       time = 45,
     },
@@ -311,8 +313,7 @@ data:extend({
     },
     prerequisites = {
       "automation-4",
-      "advanced-electronics-2",
-      "production-science-pack",
+      "utility-science-pack",
     },
     unit = {
       count = 120,
@@ -321,6 +322,7 @@ data:extend({
         { "logistic-science-pack", 1 },
         { "chemical-science-pack", 1 },
         { "production-science-pack", 1 },
+        { "utility-science-pack", 1 },
       },
       time = 60,
     },
@@ -469,7 +471,7 @@ data:extend({
     enabled = false,
     ingredients = {
       { "assembling-machine-5", 1 },
-      { "processing-unit", 3 },
+      { "rocket-control-unit", 3 },
       { "steel-plate", 5 },
       { "iron-plate", 5 },
       { "iron-gear-wheel", 5 },
@@ -491,7 +493,7 @@ data:extend({
     },
     prerequisites = {
       "automation-5",
-      "utility-science-pack",
+      "space-science-pack",
     },
     unit = {
       count = 150,
@@ -501,6 +503,7 @@ data:extend({
         { "chemical-science-pack", 1 },
         { "production-science-pack", 1 },
         { "utility-science-pack", 1 },
+        { "space-science-pack", 1 },
       },
       time = 75,
     },