Test Point Design Guidelines for Bed of Nails Fixtures
Test point designs require 0.80 mm targets on 1.27 mm pitch with bottom-side placement to maximize fixture alignment and maintain strain under 500 microstrain.
Fixture NRE Cost
Tooling Investment
Initial financial outlay covers the custom mechanical hardware required to hold and align printed circuit boards during automated assembly. Fixture nre cost represents the non-recurring engineering expenditure for designing and machining dedicated solder pallet supports, test jigs, and stencil tensioners before volume production begins. Tooling shops calculate these lump charges by multiplying total design hours and machine run time by an agreed engineering rate.
Suppliers amortize this capital sum across initial purchase orders or bill it as a distinct upfront line item on commercial quotations.
Charge Amortization
Contract manufacturers separate non-recurring charges from piece part prices to protect profit margins against volume fluctuations. Buyers negotiate payment milestones tied to design sign-off and physical sample approval before tool fabrication starts. This accounting method ensures that ownership of the physical aluminum frames and custom plastic nests transfers to the purchaser upon final payment.
Fabrication Verification
Quality engineers inspect completed mechanical fixtures using coordinate measuring machines to verify hole locations and support pin heights against computer aided design files. Dimensional deviations exceeding tight assembly tolerances cause immediate tool rework at the vendor expense. Post-inspection acceptance triggers the release of the tooling for surface mount placement and wave soldering operations.