# Machining & Fasteners Calc

Spindle speeds, feeds, metal removal, tap drills, thread geometry, bolt torque and sheet-metal bends.

## How to pay

Machine-payable over x402. USDC on: Base (eip155:8453), Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp), Polygon (eip155:137), Arbitrum One (eip155:42161).
No accounts. No API keys. No signup. The paying wallet is the account.

## Machine-readable

- OpenAPI: https://machining-calc.x402tookit.com/openapi.json
- x402 manifest: https://machining-calc.x402tookit.com/.well-known/x402
- Catalog (free): https://machining-calc.x402tookit.com/catalog
- Health (free): https://machining-calc.x402tookit.com/health
- Uptime (free): https://machining-calc.x402tookit.com/uptime

## Endpoints (8)

### GET /bend-allowance — $0.02
Sheet-metal bend allowance, outside setback, bend deduction and flat length from angle, radius, thickness and K-factor.
Params: angle: number, insideRadius: number, thickness: number, kFactor?: number
Example: https://machining-calc.x402tookit.com/bend-allowance?angle=90&insideRadius=2&thickness=1

### GET /bolt-torque — $0.02
Bolt preload (75 percent of proof) and tightening torque estimate T = K F d for ISO property classes 8.8, 10.9, 12.9.
Params: diameter: number, pitch?: number, propertyClass: string, nutFactor?: number, preloadFraction?: number
Example: https://machining-calc.x402tookit.com/bolt-torque?diameter=10&propertyClass=8.8

### GET /cut-time — $0.02
Machining time for a cut length from a table feed, or from rpm and feed per revolution, with passes.
Params: length: number, feed?: number, rpm?: number, feedPerRev?: number, passes?: integer, units?: string
Example: https://machining-calc.x402tookit.com/cut-time?length=12&rpm=800&feedPerRev=0.01&passes=3

### GET /feed-rate — $0.02
Milling table feed from rpm, flutes and chip load, or the chip load a given feed produces.
Params: rpm: number, flutes: integer, chipLoad?: number, feed?: number, units?: string
Example: https://machining-calc.x402tookit.com/feed-rate?rpm=3000&flutes=4&chipLoad=0.002

### GET /mrr — $0.02
Metal removal rate for milling (width x depth x feed) or turning (surface speed x feed x depth of cut).
Params: mode: string, depth: number, width?: number, feed?: number, surfaceSpeed?: number, feedPerRev?: number, units?: string
Example: https://machining-calc.x402tookit.com/mrr?mode=milling&width=0.5&depth=0.25&feed=24

### GET /speed-rpm — $0.02
Spindle rpm for a diameter at a surface speed (SFM or m/min), or the surface speed an rpm gives.
Params: diameter: number, surfaceSpeed?: number, rpm?: number, units?: string
Example: https://machining-calc.x402tookit.com/speed-rpm?diameter=0.5&surfaceSpeed=100

### GET /tap-drill — $0.02
Tap drill size for metric coarse (M3 to M24) and common inch threads (#4-40 to 1/2-20), with the formula check.
Params: thread: string
Example: https://machining-calc.x402tookit.com/tap-drill?thread=M8

### GET /thread-geometry — $0.02
ISO metric thread dimensions: pitch diameter, minor diameters, thread height and tensile stress area.
Params: diameter: number, pitch: number
Example: https://machining-calc.x402tookit.com/thread-geometry?diameter=10&pitch=1.5

## Terms

Computed locally from standard machining formulas and published thread tables, provided as is, with no warranty. Cutting data and torque are starting estimates; follow the tool maker's data, the fastener specification and shop safety practice. Not engineering advice.