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Practical references for the trades we build calculator apps for - machining, electrical, welding, construction - plus the operations stuff every shop owner runs into. Written by people who do the work.
Skim, save, send to a teammate. Each post stands alone - no pre-reading required.
Feeds and speeds reference for mill and lathe: surface speed to RPM, chip load to feed rate, MRR, and starting SFM ranges. Same math as the ShopCalc app, free in the browser.
75% and 60% thread engagement charts in inch and metric, the formula behind them, and when to drop to 60% on stainless and titanium.
Pick the right copper or aluminum wire size with NEC 310.16, derate for ambient and conductor count, and check voltage drop on long runs.
Starting points for amperage, voltage, wire feed speed, and gas selection by material thickness - plus how to read the puddle when you're outside the chart.
The three formulas, overage rules of thumb, mix design and rebar references, and how to avoid the most common short-load and over-order mistakes.
AWC DCA 6 + IRC R507 spans for SPF and SYP, when composite forces 12" oc, the modern structural-screw replacement for ledger lags, and the joist-tape that adds a decade of life for $30.
Sheet-count formula, screw spacing, mud-and-tape estimating, and the brand-specific picks (USG green-lid vs blue-lid, Easy Sand 90, FibaFuse) - plus the IRC R302.6 5/8" Type X spec for garage ceilings.
Coverage formula with realistic numbers, the one-coat tier (Aura, Emerald, Marquee), the primer decision tree, and the additive + brush picks (Floetrol, Wooster Shortcut, Purdy XL Glide) that decide whether the wall looks DIY or pro.
How uncoupling membrane and rigid backer solve different problems, the substrate decision tree, ANSI A108.5 95% mortar coverage, the modified-vs-unmodified thinset rule, and where backer board still beats Ditra.
Real-world load ratings for plastic, threaded, molly, and toggle anchors. When to use what, the SnapToggle install step everyone gets wrong, and why a TV mount never goes into drywall alone.
Starting recipe: 280 SFM, 4,280 RPM, ~26 IPM, 0.0015 in/tooth - plus the SFM ranges for annealed/prehard/hardened 4140, the slot/profile/trochoidal adjustments, and what the spindle is telling you when it complains.
Calculated tap drill is 0.4251". Closest commercial drill is 27/64" (~78% engagement). Drop to 7/16" for 60% on stainless and titanium. Full chart, formula, and the cutting-vs-roll-tap drill rule.
Complete paste-able program for facing 0.030" off a 2.5" diameter bar in 4140 prehard, plus the math behind G50/G96, feed/speed, and the safe-retract sequence that keeps the insert away from the chuck.
168 sq ft floor + 10% waste = 185 sq ft to order. In 12×24 tile that's 93 tiles or 12 boxes. Plus the tile-setter waste-factor rules, grout coverage, bullnose math, and why dye-lot mismatch ruins the floor.
100 ft³ / 3.7 cu yd. That's ~225 60-lb bags or ~167 80-lb bags - but at this size you should call a ready-mix truck. Full math, bag-vs-truck threshold, and rebar/mesh recommendations.
600 sq ft net area. 17 sheets of 4×9 (best fit), 19 of 4×8, 13 of 4×12. Why 9 ft ceilings change the math, plus screws, tape, mud, and the hang sequence that kills horizontal seams.
165–185 A at 19–21 V, ~290 IPM wire feed, 14–18 IPM travel, C25 gas at 35–45 CFH. The math behind those numbers, the puddle-reading symptoms, and when to switch from short-circuit to spray.
GTAW root: 10–25 kJ/in. SMAW root: 12–35 kJ/in. The real limit is the qualified WPS - ASME Section IX QW-409.1 makes heat input an essential variable. How HI affects HAZ toughness on notch-critical pressure-vessel steel.
3/32" (2.4 mm) tungsten, 2% lanthanated or ceriated (skip the thoriated). Sharp 30° point with 0.005" flat. Plus the cup size, gas flow, filler rod, and color-check guide for clean stainless TIG.
Ampacity says #8 Cu, voltage drop forces #6 Cu. Aluminum equivalent: #2. Full NEC 310.16 + 210.19 calculation, the EV-charger case (where this comes up most), and the conduit-fill check.
Fill is 0.135 sq in in a conduit with 0.213 sq in (40%) capacity - 25.3% fill, comfortably legal under NEC Chapter 9. Plus the full table, alternative conduit types, and the 360° bend rule.
The 3% / 5% rule is in an Informational Note - recommendation, not enforceable code. Where it stops being optional, the formula, the math at the most-common run lengths, and how loads degrade with VD.
A practical structure plus a copy/paste template you can ship today. Get approvals faster without sounding stiff.
What to include, when to use it, and a clean template for high-ticket items, equipment, and Marketplace deals.
Bill of sale template for Marketplace, how to sell safely in person, safest payment (cash, Zelle, ACH), scam red flags, and a clean handover checklist for tools, vehicles, and higher-ticket items.