From 2df8b914d25d22fe927d500219292a5d33a654a7 Mon Sep 17 00:00:00 2001
From: Rahix <rahix@rahix.de>
Date: Sat, 31 May 2025 21:17:27 +0200
Subject: [PATCH] Fix spring dimensioning calc error

We have 4 springs, so the effective spring constant is 4 times higher.
Reflect this in the calculations and adjust the CAD model for the
updated spring length.
---
 FootBracket.FCStd         |  4 ++--
 MiscParts.FCStd           |  4 ++--
 Profiles.FCStd            |  4 ++--
 STM-Cage.FCStd            |  4 ++--
 STM-Frame.FCStd           |  4 ++--
 STM.FCStd                 |  4 ++--
 Spring-Dimensioning.ipynb | 16 +++++++++++-----
 7 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/FootBracket.FCStd b/FootBracket.FCStd
index df92892..8c989e7 100644
--- a/FootBracket.FCStd
+++ b/FootBracket.FCStd
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:419a7f9d1609126ba83677047168d9d12095f87d7a9aa4857486e1d8660c9d2f
-size 810379
+oid sha256:8beaa499e84d1df72b27edc59d55c35ef5ae3d4fb872a1807c46ca4348156abe
+size 805743
diff --git a/MiscParts.FCStd b/MiscParts.FCStd
index c6d87ee..467034c 100644
--- a/MiscParts.FCStd
+++ b/MiscParts.FCStd
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:2e55773359ace46370f9dd794b408f73a1ea1cede2141e687ca299e1ec2f87b5
-size 246385
+oid sha256:593d49b1eda0b1ed7c285e48bbabd48f0ba9edd402539374c44e63f11b6b94b0
+size 246982
diff --git a/Profiles.FCStd b/Profiles.FCStd
index a3f88a3..7d60262 100644
--- a/Profiles.FCStd
+++ b/Profiles.FCStd
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:d8ed7527f7a7d33051fbc867196fd9624c5dd4bc2fcb3c0d7caf6f21a8037e53
-size 989972
+oid sha256:6d5483458e7b2af03d98394694a9707e1e9dd7abedcd66e1dac358be605f20de
+size 988522
diff --git a/STM-Cage.FCStd b/STM-Cage.FCStd
index 11073cd..c67c3e7 100644
--- a/STM-Cage.FCStd
+++ b/STM-Cage.FCStd
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c5f4fa18f0927805fd459e59cd1667f2482e46f14e270c64675f48e549513140
-size 101735
+oid sha256:fd5fad41c6526ae8906f4bc6d18e1dd630e5c027b819668162d5d639b2f70137
+size 91608
diff --git a/STM-Frame.FCStd b/STM-Frame.FCStd
index 5ef4239..ce083be 100644
--- a/STM-Frame.FCStd
+++ b/STM-Frame.FCStd
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e0f59094da70d2c345f1553c198cf7a1bee965c7cf2a2f783a1c326b01f2bbae
-size 157931
+oid sha256:323b9464fdf6d2e929e772fc6ab9a9885343352f82a026d029752db45b167e0e
+size 163279
diff --git a/STM.FCStd b/STM.FCStd
index 49bc1d4..eae1607 100644
--- a/STM.FCStd
+++ b/STM.FCStd
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7bcd65c0d56bc50dd3369d5b6b39950f905b92aa323b92db80ebdc1ea5792c92
-size 87244
+oid sha256:a1754ac24038bb9722db6b8c2e160dd936f6ad3ca7a90744663bfe5f009d5603
+size 81952
diff --git a/Spring-Dimensioning.ipynb b/Spring-Dimensioning.ipynb
index 0793aa7..7bd44e8 100644
--- a/Spring-Dimensioning.ipynb
+++ b/Spring-Dimensioning.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 1,
    "id": "5bef2913-4855-471d-9594-5ec45c029048",
    "metadata": {},
    "outputs": [
@@ -10,8 +10,8 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Length: 236.9 mm\n",
-      "Freq:   1.411 Hz\n"
+      "Length: 143.2 mm\n",
+      "Freq:   2.822 Hz\n"
      ]
     }
    ],
@@ -19,7 +19,7 @@
     "import math\n",
     "\n",
     "# Parameters\n",
-    "spring_constant_n_mm = 1.1\n",
+    "spring_constant_n_mm = 1.1 * 4\n",
     "spring_length_resting_mm = 112\n",
     "\n",
     "def spring_length_at(weight):\n",
@@ -39,7 +39,13 @@
    "cell_type": "code",
    "execution_count": null,
    "id": "f21d84d9-c7a1-4fd2-aa32-136f04db32e5",
-   "metadata": {},
+   "metadata": {
+    "editable": true,
+    "slideshow": {
+     "slide_type": ""
+    },
+    "tags": []
+   },
    "outputs": [],
    "source": []
   }