Engineering Support

Frequently Asked Questions

What is Design for Manufacturability (DFM)?

Design for Manufacturability (DFM) is an engineering practice that evaluates a part's design against the planned production process. As it applies to injection molding, parameters would include assessing wall thickness uniformity, draft angles, gate location, parting line placement, and material behavior under processing conditions, all before tooling is cut.

Catching a design problem in review costs nothing. Catching it after tooling is built can cost tens of thousands of dollars and weeks of schedule. AIM engineers conduct DFM reviews as a standard part of new part development, running mold-flow analysis and flagging issues early, so designs are production-ready before the first tool is made.

How does engineering support reduce injection molding costs?

Thorough and involved engineering support can help reduce injection molding costs. The majority of injection molding cost is locked in at the design stage. Wall thickness that's too uniform traps heat and extends cycle times. Gate locations that were not thought through creating cosmetic defects that require secondary operations. Material choices made without processing knowledge that leads to excessive scrap or rework.

Engineering involvement early in the process catches these decisions before they become expensive problems. AIM engineers have resolved issues that previous molders could not diagnose, including identifying a foam additive that eliminated a persistent sink mark problem for a medical device customer, a fix that costs far less than retooling.

When should an injection molding engineer be involved in product development?

An injection molding engineer should be involved in product development prior to committing to tooling. Once a mold is cut, any change to address a design or material issue carries significant cost and schedule impact. The earlier an injection molding engineer reviews the design, the more options are available and the lower the cost of any changes.

For complex or tight-tolerance parts, AIM recommends engineering involvement at the concept stage, when material selection, part geometry, and assembly interfaces are still fluid. This is how AIM operates: as an engineering partner upstream in development, not a manufacturer brought in at the end.

How do engineers choose the right plastic material for a part?

Material selection is driven by the functional requirements of the part and the conditions it will encounter. Engineers evaluate mechanical properties (strength, stiffness, impact resistance), thermal performance, chemical and moisture resistance, dimensional stability, biocompatibility where required, and ESD characteristics for electronic applications.

Cost and processability matter too. Some materials with excellent properties are difficult to mold consistently. AIM engineers work across more than 700 active materials and understand the processing tradeoffs that a materials datasheet alone will not tell you.

How does Design for Manufacturability improve product quality?

Design for Manufacturability (DFM) improves quality by resolving the root causes of defects before production begins rather than detecting and reacting to defects after parts are made.

Common quality issues in injection molding, like sink marks, warpage, short shots, weld lines, and dimensional variation, trace back to design decisions. Wall thickness can cause differential shrinkage. Gate placement can create a weld line in a structurally critical area, or draft angles might be insufficient for clean ejection. When these issues are addressed in the design phase, the process runs more consistently, scrap rates drop, and parts meet specifications every time. AIM Processing experiences less than 0.001% return rate, to reflect the result of a manufacturing process built on sound design and scientific molding methodology.