You upload a STEP file, receive a quote in a few hours, approve it, and a package arrives at your door. What actually happens between upload and delivery involves multiple steps and quality checks that determine whether your part succeeds or fails.
Having processed over 10,000 custom part orders, we have refined this workflow to catch problems early. Here is what really happens behind the scenes.
Step 1: File Reception and Initial Check (0-15 minutes)
Automated systems run basic checks
File Integrity: Can standard CAD software open it? Roughly 3-5% of uploaded files have corruption issues from cloud storage sync problems.
Unit Verification: Is the part designed in millimeters or inches? We have seen parts designed at 1 inch mistakenly interpreted as 1mm, resulting in tiny unusable pieces. This costs ₹3,000-8,000 in wasted material and machine time.
Geometry Validation: Are there missing surfaces or invalid solids? These errors crash toolpath generation and must be fixed before quoting.
If any check fails, you receive an immediate email requesting a corrected file. This saves 2-3 days compared to discovering issues during programming.
Step 2: Engineering Review and DFM Analysis (30 minutes to 2 hours)
A manufacturing engineer evaluates manufacturability
Tolerance Feasibility: Can specified tolerances be achieved with available equipment? A ±0.01mm tolerance on a large part may require grinding operations, doubling the cost.
Tooling Access: Can cutting tools reach all features? Internal corners with zero radius are impossible to machine since endmills are round. The engineer adds minimum radius recommendations, typically 1-2mm.
Material Suitability: Does the chosen material work for the design? Thin walls in brittle materials like acrylic crack during machining. For acrylic parts, we recommend 3mm minimum wall thickness.
Setup Requirements: How many operations does the part need? Each setup adds ₹500-1,000 and increases lead time by 1-2 days.
From our experience, 60% of uploaded files have at least one manufacturability issue. Catching these before quoting prevents rework and delays.
Step 3: Quoting and Material Sourcing (2-6 hours)
The system generates a quote using current material rates and estimated machine time. For custom fabrication, our AI matches your requirements to qualified vendors based on capability and current workload. Roughly 30% of customers request modifications after seeing the price.
Step 4: CAM Programming (1-4 hours)
After you approve the quote, a CAM programmer converts your 3D model into machine instructions:
Operation Sequencing: Determining which features get machined first.
Tool Selection: Choosing endmill sizes and cutting speeds based on material hardness.
Simulation: Running virtual machining to detect collisions and verify cycle time. This catches 90% of programming errors before they damage real parts.
Step 5: Manufacturing Execution (2-72 hours)
CNC Machining: The operator loads material, runs the first part as a test piece, measures critical dimensions, and adjusts offsets if needed. A simple bracket takes 30 minutes, while a complex housing can take 3-4 hours per piece.
3D Printing: FDM prints run 4-24 hours depending on part size. SLA prints take 2-8 hours plus 2-4 hours for post-curing.
Sheet Metal: Laser cutting takes 5-20 minutes per sheet. Bending operations follow, with the operator checking bend angles after the first piece.
Step 6: Quality Control and Finishing (1-8 hours)
Critical dimensions get verified using calipers or micrometers. Out-of-tolerance parts get scrapped or reworked, costing 4-6 hours of lost time. Surface treatments like anodizing take 24-48 hours. Parts get deburred and cleaned, taking 10-30 minutes per part.
Step 7: Packaging and Shipment (4-24 hours)
Parts get wrapped in protective materials and handed to logistics partners. You receive tracking information via email and WhatsApp. Standard shipping takes 3-7 days, priority shipping takes 1-3 days.
Where Delays Actually Happen
Based on our order data
Material procurement (40%): Exotic materials require special ordering, adding 5-10 days
Programming complexity (25%): Intricate geometries need careful toolpath planning
Quality issues requiring rework (20%): Dimensional problems mean restarting from raw material
Finishing bottlenecks (15%): Anodizing happens in batches, so parts may wait
Understanding this workflow helps you make better decisions. Specifying readily available materials, designing for manufacturability, and accepting standard lead times keep your parts moving smoothly through production.