Engineering Guide
Engineering Changes for Custom Metal Assemblies: Control the Cutover
Link revised drawings, purchased parts, work in progress and inspection so a design change reaches the correct production units.
Read article
AUTHOR PROFILE / 作者档案
Zaid Arshad
Manufacturing Content Author · KEC TourZaid Arshad writes practical manufacturing guides for engineers and sourcing teams evaluating custom fittings, CNC-turned parts, sheet-metal components, stampings and die-cast parts. His articles focus on clearer RFQs, supplier evidence, inspection planning and drawing-to-production decisions.
Zaid Arshad 专注于定制金属零件、CNC 车削、RFQ 准备、供应商采购、加工质量、检测以及按图制造等内容，为全球采购商提供实用制造指南。
AUTHOR ARTICLES
Engineering insights by Zaid Arshad
Engineering Guide
Burr Direction on Stamped Parts: Put the Functional Edge on the Drawing
Specify the acceptable edge condition and orientation where stamped parts contact seals, wires, hands or mating surfaces.
Read article
Engineering Guide
Die Casting Porosity in Leak-Critical Parts: Plan Before Tooling
Connect casting design, machined surfaces, inspection and leak acceptance before committing to a pressure-containing part.
Read article
Engineering Guide
Sheet Metal Springback: Validate the Bend Before Freezing the Blank
Use material, tooling and representative bend results to control final angle and develop a reliable flat pattern.
Read article
Engineering Guide
Self-Clinching Fasteners in Sheet Metal: Design the Installation
Check sheet thickness, hardness, hole preparation, edge distance and installation access before specifying clinch hardware.
Read article
Engineering Guide
Thread Gauges for Custom Fittings: Match the Thread and Acceptance Rule
Choose thread gauges by standard, size, pitch and tolerance, then document correct use and calibration status.
Read article
Engineering Guide
Electropolishing or Passivation for Stainless Parts: Define the Goal
Distinguish chemical passivation from electropolishing and account for appearance, geometry and final verification.
Read article
Engineering Guide
Deburring Small Internal Passages in Custom Manifolds
Plan access, controlled edge removal and cleanliness checks at internal intersections that exterior inspection can miss.
Read article
Engineering Guide
Brass or 316 Stainless Steel for Custom Fittings: Compare the Service
Compare exact alloy, fluid compatibility, strength, machining and joining requirements before selecting a fitting material.
Read article
Engineering Guide
Pressure and Leak Tests for Custom Fittings: Write a Clear Specification
Separate pressure integrity from leakage acceptance, and define the test medium, conditions, method and records.
Read article
Engineering Guide
Aluminum vs Zinc Die Casting for Custom Hardware
Compare aluminum and zinc die casting using the part geometry, weight, finish, tooling, production volume and final functional requirements.
Read article
Engineering Guide
Die Casting Plus CNC Machining: Datum, Allowance and Finish Planning
Coordinate casting datums, machining allowance, critical features and final finish before combining die casting with CNC operations.
Read article
Engineering Guide
Metal Stamping Tooling Cost and Break-Even Volume
Calculate stamping tooling break-even using the complete tool investment, variable cost per accepted part, demand and maintenance assumptions.
Read article
Engineering Guide
Progressive Die vs Single-Stage Stamping: Which Process Fits Your Volume?
Compare progressive and single-stage stamping by volume, tooling cost, design stability, secondary operations and accepted-part economics.
Read article
Engineering Guide
Bend Allowance and K-Factor for Custom Sheet Metal Parts
Use material, bend radius, tooling and validated allowance to connect a sheet metal flat pattern with the required formed dimensions.
Read article
Engineering Guide
Sheet Metal RFQ Checklist: Flat Pattern, Bends, Hardware and Finish
Prepare a sheet metal RFQ with the formed drawing, flat pattern, material, bend details, hardware, finish and assembly requirements.
Read article
Engineering Guide
Thin-Wall Sleeves and Bushings: Distortion, Burrs and Inspection
Control distortion, burrs and measurement when machining thin-wall sleeves and bushings, from workholding through final inspection.
Read article
Engineering Guide
What Drives CNC Turning Cost for Stainless Connectors?
Understand how stainless grade, stock, geometry, threads, tooling, deburring and inspection affect the cost of a custom CNC-turned connector.
Read article
Engineering Guide
CNC Turning Tolerances for Sleeves, Bushings and Threaded Hardware
Plan turning tolerances around functional fits, wall stability, datum relationships and inspection for sleeves, bushings and threaded hardware.
Read article
Engineering Guide
Custom Stainless-Steel Adapters: Material, Threads, Finish and Inspection
Specify stainless adapters with clear requirements for alloy, thread system, sealing interface, finish, cleanliness and verification.
Read article
Engineering Guide
CNC-Machined Pressure Transmitter Housings: Design and RFQ Guide
Plan material, wall thickness, ports, datums, sealing interfaces and final inspection for a custom CNC-machined pressure transmitter housing.
Read article
Engineering Guide
Threaded Fitting Sealing Faces: How to Reduce Leak and Assembly Risk
Define sealing faces, groove geometry, surface condition and final inspection to reduce leaks and assembly problems in threaded fittings.
Read article
Engineering Guide
How to Prepare a Custom Metal Parts RFQ: A Drawing-to-Production Checklist
Prepare a complete metal-parts RFQ with controlled drawings, material, quantities, finish, inspection and the information needed for comparable quotes.
Read article
Engineering Guide
NPT vs BSP vs Metric Threads for Custom Stainless Fittings
Identify NPT, BSP and metric threads by standard, geometry and sealing method before specifying or inspecting a custom stainless fitting.
Read article