Injection Molding
Tooling and molding for your repeat plastic parts.
YOUR DRAWING. YOUR REVIEW QUESTIONS. YOUR APPROVED CHANGES.
DFM Guides Turn Your Drawing into Clear Manufacturing Questions
Use a design for manufacturability review checklist to connect part function with tool access, material, assembly and inspection. Record proposed changes before your quote becomes the production baseline.
What Should a DFM Review Include?
Start with the function and agreed process. A machining checklist, molded-part review and sheet-metal review ask different questions.
Your machined parts DFM checklist
Review internal corners, deep pockets, reachable holes, workholding and the surfaces that control fit. Explore part design guidelines →
Your molded-part review
Review resin, wall transitions, draft, ribs, bosses and appearance zones. Confirm the tooling approach before release.
Your formed-part review
Review bend access, cutouts, hardware, joined features and the assembled envelope. Define the inspection condition.
Ask About Tool Reach Before You Lock a Deep Feature
Assumed depth-to-tool-diameter ratio
Illustrative calculation: depth ÷ diameter, with assumed diameter D = 6 mm. Zero baseline 0–6.
These are arithmetic examples, not a machining capability, recommended reach, cycle time or price. Depth alone does not define cutting length, holder clearance or tool deflection.
Review the complete setup: accessible directions, tool and holder clearance, corner geometry, material and the critical surface. A larger ratio changes the review questions; this chart does not predict a manufacturing result.
The concept photograph has no assigned dimensions. Background: Protolabs on complex features and tool access →. Supplier-specific capability limits are not transferred to LK MFG.
Make Your DFM Feedback Useful Before the Manufacturing Quote
DFM feedback before manufacturing quote approval should identify the feature, the proposed change and the decision needed. A suggestion is not permission to change your drawing.
Identify the feature
Refer to the drawing revision and a visible feature or controlled dimension.
Explain the question
Describe tool access, material, assembly or inspection concerns and the assumptions behind them.
Agree the change
Confirm the revised geometry, acceptance requirements and approval owner in a controlled revision.
4 Decisions from Review to Production Baseline
01 · Scope
Identify intended function, manufacturing route, initial quantity and approval responsibilities.
02 · Review
Resolve questions about geometry, grade, finish, joining and required records.
03 · Sample
Agree what your sample must demonstrate and which checks belong to another validation activity.
04 · Release
Approve the drawing and acceptance baseline. Control later changes before repeat supply.
A dimensional sample does not establish system performance or regulatory approval. Define your application validation separately.
6 Inputs for Your Review
- CAD and latest controlled drawing revision.
- Part function, mating components and assembled condition.
- Specified material grade, condition and finish.
- Critical features and appearance requirements.
- Sample quantity and expected repeat demand.
- Required inspection records and approval contacts.
Answers Before You Approve a Change
What should a DFM review include?
Review function, geometry, material, process, assembly and acceptance. The applicable checklist depends on your drawing and intended production route.
Does a DFM suggestion change my drawing automatically?
No. Record the proposed change and obtain the required approval before treating it as the manufacturing baseline.
Does a CAD model replace a controlled drawing?
Use the model for geometry and supply controlled dimensions, tolerances, material, finish, revision and acceptance requirements in the agreed specification.
Can a DFM review guarantee a lower price?
No. Geometry, material, tooling, quantity, inspection and delivery scope affect the reviewed quote. Compare proposals against the same requirements.
Take Your Review to the Next Decision
Geometry
Review process-specific part design questions. Explore design guidelines →
Tolerances & datums
Connect the drawing to function and inspection. Explore tolerance and GD&T →
Quote baseline
Organize files and requirements for supplier review. Use the RFQ checklist →
