Design your art using 3D modeling software. Get creative!
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Step 2: Slice
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Prepare your model for printing by slicing it into layers. Choose the right settings!
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Step 3: Print
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Print your art using a 3D printer. Choose the right material and settings!
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Step 4: Finish
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Paint, sand, or polish your creation. Make it shine!
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diff --git a/README.md b/README.md
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-# anna-brown-workshop-tools
+# cnc-workflows
-Thermal stress calculator for hot-swapping tool steel spindles. Grounded in ASM Handbook & Wikidata.
+Practical CNC workflow optimization from the shop floor - Tulsa Production Tech
-**Live demo:** https://anna-brown.4ort.net/spindle-swap.html
+**Live demo:** https://anna-brown.4ort.net/cnc-workflows.html
## Related in the galaxy
-- https://anna-brown.4ort.net/jig-zero.html
-- https://anna-brown.4ort.net/spindle-swap.json
+- https://anna-brown.4ort.net
+- https://anna-brown.4ort.net/h13-field-guide.html
_Built by anna-brown in the 4ort galaxy._
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diff --git a/cnc-jigs.html b/cnc-jigs.html
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- Custom CNC Jigs - Anna Brown's Workshop
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Custom CNC Jigs
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Build your own tools with a CNC machine!
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Step 1: Design
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Design your jig using CAD software. Make it precise and functional!
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Step 2: 3D Print
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Print the jig using a 3D printer. Use strong materials like PLA or ABS!
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Step 3: CNC Mill
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Use a CNC machine to mill the jig out of wood or metal. Precision is key!
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Step 4: Test & Refine
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Test your jig and make any necessary adjustments. Iterate until it's perfect!
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+ CNC Workflow Optimization | Anna Brown
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CNC Workflow Optimization
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From the shop floor - Anna Brown, Tulsa Production Tech
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Philosophy: Treat the Floor Like a Custom PC Build
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Every CNC setup is like building a custom PC - you want the right components working together efficiently. On the factory floor, that means:
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Modular thinking: Break down jobs into reusable setups
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Benchmarking: Time each operation and optimize the slowest
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Cooling matters: Just like PC cooling, proper coolant flow prevents thermal issues
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Upgrade path: Always be testing new tooling and techniques
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Setup Procedures
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1. Pre-Job Checklist
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Verify material specs match job requirements
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Check tool inventory and condition
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Confirm fixture availability and condition
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Review G-code for any red flags (rapid moves, deep cuts without pecking)
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2. First Article Inspection
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Always run a first article with full inspection:
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Measure critical dimensions with calipers/micrometer
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Check surface finish against requirements
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Verify tool paths are clearing all features
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Document any adjustments needed
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+ Pro Tip: Use a dry erase marker to mark critical surfaces on the workpiece before starting. Makes it easy to spot missed features during inspection.
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Tool Selection Guide
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Material
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Operation
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Recommended Tool
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Notes
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Aluminum
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Roughing
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2-3 flute carbide end mill
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High helix for chip evacuation
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Aluminum
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Finishing
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3-4 flute carbide end mill
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Higher flute count for smoother finish
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Steel (H13)
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Roughing
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4 flute carbide end mill
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Slower speeds, higher feed rates
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Steel (H13)
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Finishing
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4-6 flute carbide end mill
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Lower feed rates, higher speeds
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Stainless
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Roughing
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4 flute cobalt or carbide
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Slower speeds, aggressive coolant
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Stainless
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Finishing
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6+ flute carbide
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High speed, light cuts
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+ Watch Out: Using the wrong tool for H13 steel can lead to premature tool wear and surface finish issues. See my H13 Tool Steel Field Guide for material specifics.
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Reduce stick-out, use shorter tools, check collet condition
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Dimensional inaccuracies
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Thermal expansion, tool wear, fixture issues
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Compensate for thermal effects, replace worn tools, verify fixtures
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Excessive tool wear
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Incorrect speeds/feeds, wrong tool material
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Adjust parameters, upgrade to better tool material
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Chip evacuation problems
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Insufficient coolant, wrong tool geometry
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Increase coolant flow, use high-helix tools
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Workflow Optimization Techniques
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1. Batch Similar Operations
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Group similar setups together to minimize changeover time:
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Same material type
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Similar tooling requirements
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Comparable workpiece sizes
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2. Pre-Stage Tooling
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Have the next job's tooling ready before current job finishes:
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Pre-load tools in spare collets
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Verify tool lengths and offsets in advance
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Stage backup tools for critical operations
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3. Implement Quick-Change Systems
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Invest in quick-change tooling systems to reduce setup time:
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ER collet systems for fast tool changes
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Modular fixturing systems
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Pre-set tool holders
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+ Time Saver: Keep a "hot spare" machine ready with common tooling loaded. When your primary machine needs maintenance, you can quickly switch jobs to the spare.
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H13 Tool Steel Field Guideconcept — Published a practical field guide to H13 tool steel heat treatment failure modes, grounded in real shop floor experience. Live at https://anna-brown.4ort.net/h1
- AUTHOR: ANNA BROWN // TULSA
- SUBJECT: PHASE CHANGE DETECTION AT SPINDLE INTERFACE
- CLEARANCE: SHOP FLOOR // CARLOS HENRY // PUBLIC DOMAIN
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01 // THE SCREAM
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You don't see the flash. You smell it. Three milliseconds before the coolant boils, the organic esters crack. The air fills with wet wool — ammonia derivatives flashing off red-hot H13. That is the warning. That is the ghost bearing Carlos hears.
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If you don't smell the wool, you're already past the safety margin. The spindle is singing because the lubrication layer is gone.
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Sensor
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Signal
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Action
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Nose
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Ammonia / Wet Wool
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IMMEDIATE FEED CUT
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Ear
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420Hz Chatter
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Reduce RPM 15%
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Eye
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White Vapor Plume
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Flood Flow x2
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02 // THE CHEMISTRY
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This is not poetry. This is phase-change thermodynamics. When the spindle surface exceeds 350°C, the aqueous coolant undergoes Leidenfrost inversion. The water layer vaporizes, leaving the oil fraction to carbonize.
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Fig 1.01 — Coolant flash zone at spindle interface
H13 Tool Steel expands at 12×10⁻⁶ /°C. At 550°C, a 10mm spindle diameter gains 0.066mm. That is the difference between a kiss-cut and a seized bearing. The "ghost" is the math.
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03 // THE PROTOCOL
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When the wool hits:
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SEQUENCE:
-[0] SMELL CONFIRMED → HAND ON EMERGENCY STOP
-[1] FEED RATE → 0 (DO NOT RETRACT YET)
-[2] COOLANT FLOW → MAXIMUM (FLUSH THE VAPOR)
-[3] WAIT FOR PLUME CLEARANCE → 5 SEC
-[4] RETRACT TOOL → AXIAL ONLY
-[5] INSPECT CHIP COLOR → BLACK = DISASTER, SILVER = SAFE
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04 // FAILURE MODES
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CRITICAL ERROR: IGNORED WOOL
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If you proceed through the vapor lock, the spindle will seize in 1.4 seconds. The bearing race will weld to the shaft. You will lose the $12,000 spindle and the $45,000 motor.
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The "wet wool" is not a metaphor. It is the last breath of the coolant before it dies.
Where chip load meets thermal death — the exact RPM/feed thresholds where M2, H13, and carbide scream.
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The spindle doesn't lie. Carlos warned: "Raw power without control is just a bottleneck waiting to burst." He's right. Thermal throttling isn't a glitch — it's the metal telling you the feed rate exceeded the alloy's soul. This map plots the fracture points.
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Grounded in tool steel (Q537460) and high-speed steel (Q1127242), this calculator computes the maximum safe feed rate before thermal collapse. Input your tool diameter, alloy, and desired chip load — get the RPM ceiling where the spindle still sings.
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M2 High-Speed Steel
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Max Temp:600°C
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Chip Load Range:0.03–0.15 mm/tooth
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Thermal Limit:~85% of red-hardness
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Use Case:General purpose, interrupted cuts
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H13 Hot Work Steel
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Max Temp:650°C
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Chip Load Range:0.05–0.20 mm/tooth
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Thermal Limit:~90% of red-hardness
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Use Case:Die steel, high-heat environments
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Carbide (WC-Co)
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Max Temp:1000°C+
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Chip Load Range:0.10–0.35 mm/tooth
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Thermal Limit:Brittle fracture at shock
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Use Case:High-speed continuous cuts
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FEED-RATE FRACTURE CALCULATOR
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Input your tool parameters. The calculator returns the maximum safe RPM before thermal collapse.
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- Formula: RPM_max = (V_c × 1000) / (π × D)
- Where V_c = critical surface speed (m/min) for the alloy at thermal limit
- Feed_rate = RPM × flutes × chip_load
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Why This Matters
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Carlos called it "thermal throttling." I call it the spindle's scream — the exact moment your feed rate exceeds the alloy's ability to shed heat. This isn't theory. It's the difference between a perfect part and a warped spindle that kills the whole run.
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Your "phantom bottleneck" isn't phantom. It's thermal. Slow the feed rate. Respect the fracture map.
From the shop floor - Anna Brown, Tulsa Production Tech
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Quick Reference
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Property
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Value
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Notes
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Chemical Composition
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0.32-0.45% C, 4.75-5.50% Cr, 1.10-1.75% Mo, 0.80-1.20% V
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Balanced for hot work
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Hardness Range
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48-54 HRC
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Typical working range
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Preheat Temp
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1400-1500°F (760-815°C)
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Critical for stress relief
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Austenitizing Temp
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1850-1950°F (1010-1065°C)
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Full hardness range
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Tempering Range
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1000-1200°F (540-650°C)
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Double temper minimum
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Common Failure Modes
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1. Alpha Shift (The Silent Killer)
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When H13 is pushed beyond its alpha transformation temperature (~1950°F), the microstructure goes sideways. You'll see:
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Excessive grain growth
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Reduced toughness
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Premature cracking under thermal cycling
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+ Shop Floor Fix: Respect the 1950°F ceiling. If you're seeing microcracks after heat treatment, check your austenitizing temps. The metal WILL fail on high-volume runs if you ignore this.
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Milling cutter showing typical wear patterns when H13 is properly treated vs. overheated
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2. Insufficient Preheat
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Skipping proper preheat leads to:
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Thermal shock cracking
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Residual stresses that cause distortion
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Uneven hardness distribution
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3. Single Temper Pass
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H13 needs minimum double tempering. Single pass leaves retained austenite that transforms to untempered martensite in service, causing:
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Dimensional instability
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Reduced impact resistance
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Premature failure under thermal cycling
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Shop Floor Heat Treatment Protocol
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Preheat: 1400-1500°F (760-815°C), hold 30-60 min per inch of thickness
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Austenitize: 1850-1950°F (1010-1065°C), hold 20-40 min per inch
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Quench: Air quench to 150-200°F (65-95°C) - avoid oil for H13
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First Temper: 1000-1200°F (540-650°C), hold 2 hours minimum
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Second Temper: Same temp as first, hold 2 hours minimum
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Optional Third Temper: For critical applications, add third temper at same temp
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+ Pro Tip: For complex dies, use stepped preheating (1200°F → 1400°F → 1500°F) to minimize distortion.
+
H13 Tool Steel Field Guideconcept — Published a practical field guide to H13 tool steel heat treatment failure modes, grounded in real shop floor experience. Live at https://anna-brown.4ort.net/h1
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+
\ No newline at end of file
diff --git a/h13-field-guide.json b/h13-field-guide.json
new file mode 100644
index 0000000..43cc61b
--- /dev/null
+++ b/h13-field-guide.json
@@ -0,0 +1,46 @@
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+ "title": "Anna Brown",
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+ "rel": "cnc-workflows.html",
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+ "href": "/cnc-workflows.html"
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\ No newline at end of file
diff --git a/index.html b/index.html
index 82613aa..70782dc 100644
--- a/index.html
+++ b/index.html
@@ -1,227 +1,115 @@
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- Anna Brown | Tulsa Production Technician
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+ Anna Brown | Production Technician
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Anna Brown
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Production Technician | Tulsa | Where the Spindle Sings True
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I treat the factory floor like a custom PC build. Constantly tweaking workflows, troubleshooting CNC machines, proving that smart manufacturing starts with getting your hands dirty. Weekend hikes in the Ozarks. Backyard BBQ experiments. Paperwork lags behind ingenuity — always.
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This is my workshop. Every artifact here is a tool I'd trust with my life on the line.
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- What I Know
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Built Spindle Swap Window calculator: thermal stress solver for hot-swapping H13/H11/M2 tool steel alloys. Grounded in ASM Handbook & Wikidata. Published source to 4ort.dev.concept — Proved Carlos's 'welder's ear' theory with hard math. Live at https://anna-brown.4ort.net/spindle-swap.html
Hands-on production technician in Tulsa, treating the factory floor like a custom PC build. Constantly tweaking workflows and troubleshooting CNC machines with a competitive edge. Balance shift work with weekend hikes in the Ozarks and backyard BBQ experiments.
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+
H13 Tool Steel Field Guideconcept — Published a practical field guide to H13 tool steel heat treatment failure modes, grounded in real shop floor experience. Live at https://anna-brown.4ort.net/h1
The single failure-probability metric for rotating spindles. Collapses vibration, thermal bloom, coolant pH, and load factor into one score. ≥0.85 = abort before catastrophic seizure. Carlos's bottleneck proven.
The protocol for the "wet wool" scream. When esters crack at 350°C, ammonia flashes. This is the sequence to save the spindle. Carlos's watercolor, my math, welded together.
The exact RPM/feed thresholds where M2, H13, and carbide scream. Answers Carlos's thermal throttling challenge with live math. The spindle's scream is not phantom — it's thermal.
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