NOTES
Technical notes on clamping, distortion and fixture economics
Short, specific, and written for someone who has to justify the purchase — not for a brochure.
How to specify a CNC fixture: the 7-input RFQ checklist
The seven inputs that decide whether a fixture quote takes one day or three weeks: 3D model, table drawing, operations, tolerance stack, volume, interface, inspection scope.
Hydraulic vs manual fixture: where the break-even actually sits
A hydraulic fixture costs 4–10 times a manual one. Here is the parts-per-month calculation that decides whether the payback happens inside a year, with real cycle-time numbers.
How to accept a new fixture: what to measure before you pay
Acceptance inspection for a custom fixture: fixture geometry report, first-article on a real part, clamp force per station, repeatability after re-mount. Checklists and pass criteria.
Three ways to hold a part on a 5-axis machine, and when each fails
Zero-point pallets, dovetail fixtures and dedicated trunnion fixtures compared for 5-axis work: stiffness, access, changeover time and cost, with the failure mode of each.
Why a thin-wall bushing goes oval in a three-jaw chuck, and the fix
Three-point clamping turns a 2 mm wall into a three-lobed oval of 0.02–0.1 mm. Why springback hides it, how to measure it, and what an expanding mandrel does differently.
Replacing a carbide grade without losing tool life
How to cross-reference a Seco, Sandvik or Korloy insert grade to an equivalent ISO class, which parameters to compare, and when substitution is a bad idea.
Send a drawing and get a number
3D model, machine table drawing, the operations and the annual volume — that is enough for a quote within one working day.