Setting up an in-house SMT assembly line in India used to mean spending lakhs on imported industrial equipment or outsourcing everything to a contract manufacturer. That equation has changed. Compact, capable benchtop machines are now available locally — making it viable for hardware startups, electronics engineers, and small EMS operations to bring assembly in-house. Here is how to do it.
What is an SMT Assembly Line?
Surface-mount technology (SMT) assembly is the process of placing and soldering electronic components directly onto a printed circuit board. A basic SMT line has three stages:
- Solder paste printing — applying solder paste through a stencil onto the PCB pads
- Component placement — placing SMT components onto the paste-covered pads using a pick and place machine
- Reflow soldering — passing the board through a reflow oven to melt the paste and create permanent solder joints
Equipment You Need
1. Stencil Printer
A stencil printer holds your PCB and a laser-cut SMT stencil in alignment while you apply solder paste with a squeegee. For benchtop and small-batch use, a manual stencil printer is sufficient and delivers consistent results. The StencilStation is designed exactly for this — quick-lock PCB fixture, adjustable frame, and smooth squeegee mechanism for repeatable paste deposition.
2. Pick and Place Machine
The pick and place machine is the heart of the line. It picks components from tape feeders and places them precisely on the paste-covered pads. For labs and small production, an OpenPnP-compatible benchtop machine like the PlaceStation handles components down to 0402 and works with powered tape feeders for hands-free operation.
3. Reflow Oven
The reflow oven heats the board through a controlled temperature profile, melting the solder paste and forming reliable solder joints. A benchtop reflow oven like the SolderStation is compact, uses a profiled heating curve for lead and lead-free paste, and fits alongside your existing equipment.
4. Feeders
Powered feeders advance component tape automatically, eliminating manual peeling and improving pick consistency. For most setups, 8mm feeders cover passive components (resistors, capacitors) and 12mm feeders handle larger components and small ICs.
The Workflow
- Load your PCB into the stencil printer, align the stencil, apply paste
- Transfer the board to the pick and place machine, run your placement job in OpenPnP
- Place the board in the reflow oven, run your solder profile
- Inspect and test
For prototypes, this entire cycle can take under 30 minutes per board. For small batches, the pick and place step is where most of the time saving happens versus hand placing.
Costs in India
A complete benchtop SMT line from PlaceStation — including pick and place machine, stencil printer, reflow oven, and feeders — is available as the Complete Lab Bundle starting at under ₹2,50,000. Compare this to outsourcing assembly at ₹500–2000 per board for small runs, and the line pays for itself quickly once you are running regular batches.
Importantly, buying locally means full GST invoices for input tax credit, no import duties, and local support and spare parts.
What to Watch Out For
- Stencil quality — always use laser-cut stainless steel stencils. Cheap stencils give inconsistent paste deposits and lead to solder bridges and tombstoning.
- Paste storage — solder paste must be refrigerated and brought to room temperature before use. Do not skip this.
- Component orientation — verify your pick and place job file rotation values carefully before the first run. A small rotation error on a QFP or SOT component will cause failures.
- Reflow profile — use the paste manufacturer's recommended profile. Do not rush the ramp rate.
Getting Started
The fastest way to get started is with a bundle. The PlaceStation Complete Lab Bundle includes everything you need for a full SMT line, made in India, with local support from Tejwani Industries in Pune.