CATIA Part Design – Pad, Pocket & Shell Features Explained – Episode 5 (Updated June 2026) (Updated June 2026)
What most people don't realise about CATIA is that the Part Design workbench is where your 2D sketch becomes a real 3D component — and Episode 5 is entirely dedicated to the core features that make this happen: Pad, Pocket, Shell, Fillet, and Chamfer. These five operations cover 80% of what you'll use daily as a Design Engineer at Bajaj Auto, Mahindra, or Tata Technologies. The AURIC corridor near Sambhajinagar has brought ₹71,343 crore in manufacturing investment and 62,405 jobs to the region — and every single mechanical design seat at Skoda VW (Plot A-1/1), Endurance Technologies (Plot E-92), and Toyota Kirloskar AURIC requires exactly this skill set. Let's break it down.
- CATIA Part Design Episode 5 covers Pad (extrude), Pocket (cut), Shell (hollow), Fillet, and Chamfer
- Pad creates solid 3D bodies from closed Sketcher profiles; Pocket removes material using the same approach
- Shell hollows a solid body to a uniform wall thickness — critical for enclosures, brackets, and plastic components
- Fillet and Chamfer add rounded or angled edge breaks required for casting, machining, and strength specifications
CATIA Part Design Workbench Overview
The Part Design workbench in CATIA V5 is where 2D sketches become 3D solid models. You access it from Start → Mechanical Design → Part Design. The feature tree on the left — called the Specification Tree — records every operation you apply. One of the great strengths of CATIA's parametric approach is that you can go back and edit any feature at any point in the tree: change a Pad depth, adjust a Fillet radius, or modify the underlying sketch, and the entire part updates automatically. This is what sets CATIA apart from simple 3D modellers and why aerospace companies like Dassault and Airbus standardised on it. For mechanical engineering students in Pune or Sambhajinagar looking at a career in automotive or manufacturing, Part Design is the non-negotiable foundation.
Pad and Pocket — The Two Foundational Features
The Pad feature extrudes a closed 2D profile from the Sketcher into a 3D solid body. You choose a sketch, click Pad (or Insert → Sketch-Based Features → Pad), enter a depth value, and hit OK. Options include symmetric extrusion (extends equally both ways), mirrored extent, and draft angle for moulds and castings. The Pocket feature works identically but removes material — cutting holes, slots, and recesses into an existing solid. The good news is both features accept the same fully constrained Sketcher profiles you learned in earlier episodes. At Bajaj Auto Waluj (Plot G-137) and Endurance Technologies (Plot E-92), Design Engineers spend the majority of their time on Pad and Pocket operations to model brackets, covers, and housings for two-wheeler components.
| Feature | Operation | When to Use |
|---|---|---|
| Pad | Extrude profile into solid | Base body, flanges, bosses |
| Remove material from solid | Holes, slots, recesses | |
| Shell | Hollow to wall thickness | Enclosures, plastic parts |
| Fillet | Round an edge | Stress relief, casting specs |
| Chamfer | Angled edge break | Assembly clearance, deburring |
Shell, Fillet, and Chamfer — Finishing Your 3D Model
The Shell feature hollows a solid body, removing selected faces and leaving a uniform wall thickness behind. It's essential for any plastic or cast enclosure — set the thickness to 2 mm for a consumer product housing, or 5 mm for a structural bracket. Fillet adds a smooth rounded edge between two faces: critical for reducing stress concentration in load-bearing parts and meeting casting radius specifications. Chamfer creates a flat angled break at an edge — used for assembly clearance, deburring requirements, and mating surfaces. Trust me — if you skip fillets on a part that goes into a casting drawing, the pattern shop will send it right back. These three features separate a student model from a production-ready CAD file that Toyota Kirloskar AURIC or Hyosung Bidkin can hand to their tooling team.
Why These Skills Land You a Job at Bajaj, Mahindra, or Tata Tech
Here's a concrete picture of where this skill takes you: Tata Technologies Pune pays ₹3.8–5.0 LPA for freshers with CATIA Part Design certification. Mahindra Engineering Services starts at ₹4.0–6.0 LPA. Skoda VW Shendra (Plot A-1/1, AURIC) hires CATIA Modellers at ₹3.5–5.5 LPA. Force Motors Pune and Bajaj Auto (164+ open CAD roles) typically offer ₹3.5–5.0 LPA to freshers — all sourced from AmbitionBox and Glassdoor 2025 data. ABC Trainings' CATIA batch covers Part Design Pad/Pocket/Shell/Fillet/Chamfer in the first module, with hands-on projects modelling real automotive components. Students complete a project portfolio they carry to interviews.
| Role | Company | Salary (LPA) |
|---|---|---|
| CATIA Design Engineer | Tata Technologies, Pune | ₹3.8 – 5.0 |
| Product Design Engineer | Mahindra Engineering Services | ₹4.0 – 6.0 |
| CATIA Modeller | Skoda VW, Shendra AURIC | ₹3.5 – 5.5 |
| Design Engineer (Automotive) | Bajaj Auto, Waluj (G-137) | ₹3.5 – 5.0 |
| Sr. CAD Engineer | KPIT Technologies, Pune | ₹8.0 – 12.0 |
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FAQs
What is the difference between Pad and Extrude in CATIA?
In CATIA V5, Pad is the standard term for what other CAD tools call Extrude. The Pad feature extrudes a closed 2D Sketcher profile into a 3D solid body by a specified depth. It supports symmetric extrusion, draft angles, and multiple limits — making it more versatile than a basic linear extrude in tools like SolidWorks or AutoCAD.
How does the Shell feature work in CATIA Part Design?
The Shell feature in CATIA Part Design removes the material from inside a solid, leaving walls of a uniform specified thickness. You select one or more faces to open (remove entirely) and set the inner wall thickness. It is ideal for plastic enclosures, covers, and sheet-metal-like structures where you need consistent material thickness throughout.
Can I edit a Pad depth after I have already created it in CATIA?
Yes — CATIA's parametric approach lets you double-click any feature in the Specification Tree and edit its parameters. Double-click the Pad feature, change the depth value, and the model updates instantly. The same applies to Pocket depth, Fillet radius, and the underlying Sketch dimensions — all are live and editable at any point.
Which CATIA Part Design features do automotive companies test in interviews?
Most automotive companies (Tata Tech, Mahindra Engineering Services, KPIT, Bajaj) ask candidates to model a given component live: typically a bracket or housing that requires Pad, Pocket, Fillet, and Chamfer. Shell is tested for plastic component roles. Having a project portfolio with real component models significantly improves your interview performance at any mechanical design employer.
