Existing / Broken Spring Setup
Measure the broken spring specs to calculate replacement wire
Current Configuration
Wire Size (Inches)
Gold
Inside Diameter (ID)
Active Spring Length (Inches)
32.0"
Target Conversion Setup
Spring IPPT
35.8
inch-lbs/turn
Total System IPPT
35.8
Target balance force
Baseline Cycles
~10,000
Standard DASMA
Available Truck Stock Matcher
Live alternatives matching target IPPT across wire on your truck
| Wire Size | ID | Cut Length | IPPT (Each) | Cycle Life | Action |
|---|
💡 Pro-Tip: Tap "Select" on any row to automatically load that replacement into your printable job spec sheet.
Door & Track Specifications
Calculate required counterbalance IPPT from door dimensions
Door Width (ft)
Door Height (ft)
Total Door Dead Weight (lbs)
Don't know? Estimate weight →
Cable Drum Model
Cable Size: 1/8"
Circumference: 12.56"
Cross-Ref: Apco 400-8, Canimex, DNS
Track Configuration & Radius
Turns of Wind
7.6
7 turns + 2 quarter turns
Required Total IPPT
36.5
inch-lbs / turn
Per Spring (Pair)
18.3
target for 2 springs
Engineered Spring Recommendations
Standard, High-Cycle, and Commercial options
Sectional Door Weight Calculator
Select your manufacturer model preset or customize construction specs
📷 AI Photo Door Scanner
Vision AI
Snap a photo of the end stile stamp, factory sticker, or panel joint profile. Gemini Vision AI will identify the model and lock in exact factory weight specs.
Ready for photo
⚡ Select Factory Model Preset (Clopay, Garaga, Steel-Craft, Hörmann, Wayne Dalton, Amarr, C.H.I.)
R-Value: R-16.0
Core: 1-3/4 in Polyurethane
Density: 2.20 lbs/sq ft
Width (ft)
Height (ft)
Sections
Door Construction & Core
Window / Glass Lites
Struts & Reinforcement
Estimated Dead Weight
168 lbs
Ready for counterbalance
Per Section Weight
42 lbs
4 sections total
Dead Weight Breakdown
Component weight distribution
Base Panel Assembly:
124 lbs
Hinges, End Stiles & Rollers:
20 lbs
Window Inserts / Glass:
20 lbs
Reinforcement Struts:
24 lbs
Total Scale Weight:
188 lbs
ℹ️ Field Tip: When replacing springs on an existing door, always weigh the door with an analog scale under the bottom section before ordering to account for water absorption in older wood or uncalibrated replacement hardware.
20-Coil Wire Size Identifier
Measure 20 consecutive coils tightly with a tape measure
Measured 20-Coil Length
5.00" (5 inches)
Identified Wire Gauge
.250
5-0/16"
DASMA Color Code
Gold / Orange
Standard Paint Marker
| Tape Measurement | Wire Size | Color Code |
|---|---|---|
| 4-1/8" (4.125") | .207 | Yellow |
| 4-3/8" (4.375") | .218 | White |
| 4-1/2" (4.500") | .225 | Red |
| 4-11/16" (4.687") | .234 | Brown |
| 4-7/8" (4.875") | .243 | Green |
| 5-0/0" (5.000") | .250 | Gold |
| 5-1/4" (5.250") | .262 | Blue |
| 5-7/16" (5.437") | .273 | Black |
| 5-11/16" (5.687") | .283 | Orange |
| 6-1/4" (6.250") | .312 | Red |
OD to ID Converter & Headroom Clearance
Calculate inside diameter from outside caliper measurement
Outside Diameter (OD)
Wire Gauge
Calculated Inside Diameter (ID)
2.00" (Standard 2" ID)
Formula: ID = OD − (2 × wire diameter)
Minimum Headroom Clearances
| Track Radius / Mount | Headroom (Manual) | With Trolley Opener |
|---|---|---|
| 12" Radius Standard | 10 inches | 12 inches |
| 15" Radius Standard | 12 inches | 14 inches |
| Low Headroom (Front Mount) | 7.5 inches | 9.5 inches |
| Low Headroom (Rear Mount) | 4.5 inches | 6.5 inches |
🥁 Comprehensive Drum Comparison & Cross-Reference Explorer
Reverse-engineered industry database comparing OMI, Apco, Canimex (Torque Force), DNS & SSC
| Drum Model | Lift Type | Max Height | Cable Size | Moment Arm | Cable Travel / Turn | Cross-Reference Part Numbers |
|---|
🎯 Springs by Direct IPPT Lookup (SSC Style)
Input an exact target IPPT to view all engineered wire and length matches
Target IPPT Value
Inside Diameter
| Wire Gauge | Inside Diameter | Cut Length | Exact IPPT | Cycle Rating | Action |
|---|
📚 Manufacturer Model Weight & Density Catalog
Benchmarked factory specs across major Canadian & US overhead door manufacturers
| Manufacturer | Model / Series | R-Value | Construction Type | Weight / Sq.Ft | Typical 8x7 Wt | Typical 16x7 Wt |
|---|
📄 Job Specification Sheet
DOORMATH PRO
Torsion Counterbalance & Spring Engineering Specification
Date: 2026-09-06
Generated by DoorMathPro.com
Job & Door Details
Door Dimensions: 16'0" W x 7'0" H
Scale Dead Weight: 145 lbs
Cable Drum: OMI 400-8 (Standard Lift)
Track Radius: 15" Standard
System Counterbalance Math
Total Required IPPT: 36.5
Turns of Wind: 7.6 turns (30 quarter turns)
Balance Safety Factor: Within +/- 1%
Recommended / Selected Spring Package
(2) Springs: .250 Wire x 2.0 in ID x 32.0" Length
Rated Cycles: ~10,000 cycles | IPPT per spring: 18.3
Field Technician Verification Checklist:
[ ] Cables inspected for fraying & set screw torque checked
[ ] Drums locked securely to torsion shaft keyway
[ ] Left & right winding directions confirmed (red/black cones)
[ ] Door balances neutrally at mid-travel (waist height)
Technician Signature: _______________________
Customer Sign-off: _______________________
⚙️ AI Vision Scanner Setup
To enable photo door identification directly from your phone camera, paste your Google AI Studio API Key below.
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Google AI Studio API Key (Gemini Flash)
Don't have a key? Get one in 30 seconds for free at aistudio.google.com (allows up to 1,500 free door scans per day).
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DoorTech AI
Online Troubleshooting
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