Brackets and mounts
Modular 3-2-1 Drilling Jig & Milling Fixture Set
- Bounding box
- 1120.5 × 90.0 × 37.0 mm
- Engine
- Precision B-rep
- Parameters
- 44
- Published
- October 6, 2026
Download
Free to download and use. See the terms.
The prompt
Design a **compact, simple, manufacturable modular jig-fixture system** for a 3rd-year Production Engineering project, based on the **3-2-1 principle of location**. Create a small **aluminium mounting bracket/rectangular workpiece (~100 × 70 × 10 mm)** requiring: - 2–4 accurately positioned drilled holes - 1 central/offset milled slot - Basic preparation, milling, drilling, deburring and inspection. Design **two modules using the same workpiece**: ### 1. Plate-Type Drilling Jig Include: - 3-2-1 locating system: 3 primary + 2 secondary + 1 tertiary locator - 1–2 toggle/screw clamps - Replaceable drill bushes - Rigid base and bush plate - Quick loading/unloading - Chip clearance - No interference between drill, bush, clamps and workpiece The drill bushes must guide the drill accurately. ### 2. Milling Fixture Include: - Same 3-2-1 locating principle - Secure clamping - Rigid base/support - Full milling-cutter access to the slot - Quick loading/unloading - No unnecessary over-constraint The milling machine, not the fixture, guides the cutting tool. ### CAD REQUIREMENTS Model in **SolidWorks**: - Workpiece - Base - Primary/secondary/tertiary locators - Clamps - Drill-bush plate - Drill bushes - Fixture components - Fasteners/dowel pins Create: - Complete assembly - Exploded view - Section/cutaway view showing 3-2-1 location - Individual part drawings - Engineering dimensions/tolerances - Bill of Materials (BOM) ### DESIGN REQUIREMENTS Follow: - Degree-of-freedom analysis - 3-2-1 location - Proper locating and clamping principles - Design for Manufacturing (DFM) - Design for Assembly - Tool accessibility - Chip clearance - Easy assembly/disassembly - Standard fasteners - Minimum necessary components - Realistic manufacturing methods Suggested materials: - Industrial version: aluminium/mild steel, hardened steel for locators and drill bushes - Prototype: 3D-printed Polylactic Acid (PLA)/Polyethylene Terephthalate Glycol (PETG) with purchased fasteners, pins and bushes. Validate that: - All six degrees of freedom are constrained - The workpiece is not over-constrained - Drill and milling tools have clearance - Clamps do not obstruct machining - Workpiece can be loaded/unloaded easily - Locators contact correct datum surfaces - Assembly is physically realistic. Prioritize: **FUNCTION > MANUFACTURABILITY > SIMPLICITY > ACCURACY > APPEARANCE** The final model should look like a **small, realistic industrial jig-fixture system**, not an unnecessarily complicated classroom model.
Parameters
| Name | Value | Range |
|---|---|---|
| Exploded Layout Gap | 15 mm | 5 – 60 |
| Workpiece Length | 100 mm | 60 – 140 |
| Workpiece Width | 70 mm | 40 – 100 |
| Workpiece Thickness | 10 mm | 5 – 20 |
| Workpiece Hole Dia | 8 mm | 3 – 14 |
| Hole Edge Inset | 15 mm | 8 – 30 |
| Milled Slot Length | 50 mm | 20 – 80 |
| Milled Slot Width | 12 mm | 6 – 24 |
| Drilling Jig Base Length | 120 mm | 90 – 180 |
| Drilling Jig Base Width | 90 mm | 60 – 140 |
| Drilling Jig Base Thickness | 12 mm | 6 – 25 |
| Chip Clearance Hole Dia | 16 mm | 10 – 26 |
| Mounting Slot Length | 30 mm | 16 – 50 |
| Mounting Slot Width | 10 mm | 6 – 16 |
| Primary Locator Dia | 6 mm | 4 – 12 |
| Primary Locator Height | 8 mm | 4 – 20 |
| Secondary/Tertiary Locator Dia | 6 mm | 4 – 12 |
| Secondary/Tertiary Locator Height | 10 mm | 4 – 25 |
| Toggle Clamp Arm Length | 56 mm | 35 – 100 |
| Toggle Clamp Body Width | 20 mm | 12 – 40 |
| Toggle Clamp Arm Thickness | 6 mm | 4 – 14 |
| Bush Plate Length | 100 mm | 60 – 150 |
| Bush Plate Width | 70 mm | 40 – 110 |
| Bush Plate Thickness | 10 mm | 5 – 20 |
| Drill Bush OD | 12 mm | 8 – 22 |
| Drill Bush Bore (ID) | 8 mm | 3 – 16 |
| Drill Bush Length | 16 mm | 8 – 30 |
| Milling Fixture Base Length | 120 mm | 90 – 180 |
| Milling Fixture Base Width | 90 mm | 60 – 140 |
| Milling Fixture Base Thickness | 15 mm | 8 – 30 |
| Cutter Clearance Slot Length | 60 mm | 30 – 100 |
| Cutter Clearance Slot Width | 16 mm | 8 – 30 |
| Milling Locator Dia | 8 mm | 5 – 14 |
| Milling Locator Height | 12 mm | 5 – 25 |
| Strap Clamp Length | 70 mm | 40 – 120 |
| Strap Clamp Width | 20 mm | 12 – 40 |
| Strap Clamp Thickness | 8 mm | 4 – 18 |
| Strap Support Block Height | 20 mm | 10 – 40 |
| Fastener Nominal Dia (M6) | 6 mm | 4 – 12 |
| Screw Shank Length | 20 mm | 8 – 50 |
| Socket Head Dia | 10 mm | 6 – 20 |
| Socket Head Height | 6 mm | 3 – 14 |
| Dowel Pin Dia | 6 mm | 3 – 12 |
| Dowel Pin Length | 20 mm | 8 – 40 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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