Mainspring Barrel Envelope Screen
Screen a caller-supplied mainspring radial envelope and height against barrel, arbor, and clearance dimensions without deriving the envelope from spring length, thickness, or strength.
Description
Barrel-fit screening compares a supplied spring envelope with available radial and vertical space.
Barrel-fit screening compares a supplied spring envelope with available radial and vertical space. Envelope demand must already describe the assessed winding state.1
Screen a caller-supplied mainspring radial envelope and height against barrel, arbor, and clearance dimensions without deriving the envelope from spring length, thickness, or strength.
When to use Mainspring Barrel Envelope Screen
Use this tool to screen a caller-supplied mainspring radial envelope and height against barrel, arbor, and clearance dimensions without deriving the envelope from spring length, thickness, or strength.
Choose a supported reference focus or prepare the watch measurements, evidence and explicit limits requested. Confirm units and date conventions before running.
How to use Mainspring Barrel Envelope Screen and understand its results
- Choose a supported reference focus or prepare the watch measurements, evidence and explicit limits requested. Confirm units and date conventions before running.
- Enter availableBarrelHeightMillimeters, barrelArborDiameterMillimeters, barrelInnerDiameterMillimeters, replacementSpringHeightMillimeters, requiredSpringRadialEnvelopeMillimeters, requiredRadialClearanceMillimeters using the field table and calculation rules, then run the tool.
- Read availableRadialEnvelopeMillimeters, fitsCallerDimensions, heightClearanceMillimeters. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| availableBarrelHeightMillimeters | Available barrel height (mm) | number; minimum: 0 | Required |
| barrelArborDiameterMillimeters | Barrel arbor diameter (mm) | number; minimum: 0 | Required |
| barrelInnerDiameterMillimeters | Barrel inner diameter (mm) | number; minimum: 0 | Required |
| replacementSpringHeightMillimeters | Replacement spring height (mm) | number; minimum: 0 | Required |
| requiredSpringRadialEnvelopeMillimeters | Caller-determined radial envelope required by the spring in the assessed winding state. (mm) | number; minimum: 0 | Required |
| requiredRadialClearanceMillimeters | Required radial clearance (mm) | number; minimum: 0 | Required |
Enter positive barrel/envelope/heights, nonnegative arbor/clearance and arbor smaller than barrel. Return available radius, signed height clearance and gate requiring both sufficient radial space and nonnegative height clearance.
radialAvailable=(barrelDiameter−arborDiameter)/2−clearance; heightClearance=availableHeight−springHeight Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| availableRadialEnvelopeMillimeters | Available radial envelope (mm) | number |
| fitsCallerDimensions | Fits caller dimensions | boolean |
| heightClearanceMillimeters | Height clearance (mm) | number |
{
"input": {
"availableBarrelHeightMillimeters": 2,
"barrelArborDiameterMillimeters": 2,
"barrelInnerDiameterMillimeters": 12,
"replacementSpringHeightMillimeters": 1.5,
"requiredSpringRadialEnvelopeMillimeters": 1.2,
"requiredRadialClearanceMillimeters": 0.2
},
"output": {
"availableRadialEnvelopeMillimeters": 4.8,
"fitsCallerDimensions": true,
"heightClearanceMillimeters": 0.5
}
}Limitations and assumptions
No spring length, thickness, strength or operating envelope is inferred.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Crystal Replacement Fit Dimension Calculator: Screen replacement-crystal diameter and thickness against caller-supplied case-opening, seat-depth, and maximum-thickness dimensions. For a complementary task, use Hairspring Concentric Breathing Change Calculator: Calculate the diameter envelope of a modeled concentric breathing hairspring excursion without inferring spring geometry from a terminal-curve name.
References
-
Mainspring Barrel Envelope Screen — tool.io
Similar or alternative tools
- Crystal Replacement Fit Dimension Calculator
Screen replacement-crystal diameter and thickness against caller-supplied case-opening, seat-depth, and maximum-thickness dimensions.
- Hairspring Concentric Breathing Change Calculator
Calculate the diameter envelope of a modeled concentric breathing hairspring excursion without inferring spring geometry from a terminal-curve name.