Auto Screwing Machines & Screwing Fixtures

An auto screwing machine feeds, presents and drives screws automatically to a set torque, removing the pick-and-place time and the missed-screw defect from manual assembly. VR Automation builds auto screwing machines, screwing fixtures, multi-spindle and PLC-controlled screw driving automation at Bhosari, Pune.

The three parts of a screw driving system

Every automatic screwing machine is built from the same three subsystems, and most integration problems come from one of them being specified in isolation.

  1. The feeder. A vibratory bowl or a rail feeder orients screws and delivers them one at a time. Bowl tooling is screw-specific — head style, length-to-diameter ratio and finish all affect orientation, and a bowl tooled for one screw will not reliably feed another.
  2. The presentation. Either blow feed, where the screw is blown down a tube into a vacuum or jaw holder at the bit, or pick-up, where the driver bit takes the screw from a presenting jaw. Blow feed is faster; pick-up handles short screws and awkward head styles that will not fly down a tube.
  3. The driver. Pneumatic, electric or servo. Pneumatic clutch drivers are cheapest and shut off on torque. Electric and servo drivers measure torque and angle continuously, so they can detect a cross-thread, a missing thread or a screw that bottomed early — and record it.

Choosing the driver

Pneumatic clutch Electric (transducerless) Servo / DC with transducer
Torque control Mechanical clutch shut-off Current-based Measured torque and angle
Fault detection Minimal Basic Cross-thread, float, high/low torque, missing screw
Data recording None Limited Full per-joint traceability
Typical use General assembly Electronics, light assembly Safety-critical and traceable joints

Machine formats we build

  • Screwing fixture — the component is located and clamped, and a hand-held or fixture-mounted driver works to positive stops, so position and depth are controlled even on manual assembly.
  • Desktop / benchtop auto screwing machine — single-spindle machine with integrated feeder, for workstation assembly.
  • Multi-spindle screw driving machine — several screws driven simultaneously, holding the relative position of the fasteners and cutting cycle time to that of one screw.
  • Multi-axis / gantry screwing machine — the driver head travels to each screw position on a programmed path; suits parts with many fasteners in different positions.
  • Auto screwing SPM — screw driving integrated into a rotary indexing or in-line assembly cell alongside riveting, pressing or testing stations.
  • Robotic screw fastening system — a driver and feeder mounted as a robot end effector for complex or varied screw layouts.

Applications

Electronics and electrical assembly, switchgear and control panels, automotive interior and under-bonnet components, appliance assembly, sheet metal enclosures and server chassis, and any line where a missing or under-torqued screw is a field failure rather than a cosmetic defect.

What we need to quote

  • Screw drawing or sample — head style, drive type, diameter, length and finish
  • Number of screws per part and their positions on the component
  • Torque specification and tolerance, and whether the joint requires recorded traceability
  • Required cycle time and annual volume
  • Component drawing, for the fixture design

Related: special purpose machines, assembly fixtures.

Screw driving automation we manufacture

Frequently asked questions

What is the price of an auto screwing machine in India?

VR Automation auto screwing machines are currently listed from about ₹90,000, and screwing fixtures from about ₹18,000. Price depends on spindle count, feeder tooling, driver type and whether torque and angle data must be recorded — a transducer-equipped servo driving system costs materially more than a pneumatic clutch driver.

What is the difference between blow feed and pick-up screw feeding?

In blow feed, compressed air blows the screw down a tube directly to a holder at the driver bit — fast, and suited to screws with a length at least twice the head diameter. In pick-up feeding, the driver bit travels to a presenting jaw and collects the screw magnetically or by vacuum — slower, but it handles short screws, large heads and non-magnetic fasteners that will not fly down a tube.

Can an auto screwing machine detect a cross-threaded or missing screw?

With a transducer-equipped electric or servo driver, yes. The system monitors torque against angle through the whole run-down, so a cross-thread (torque rising too early), a stripped or missing thread (torque never reaching target), and a floating screw are each detectable and can be rejected and logged. A pneumatic clutch driver cannot distinguish these.

Do you supply the vibratory bowl feeder with the machine?

Yes. The bowl and its tooling are designed around your specific screw, so we need a sample or full drawing. A bowl tooled for one screw will not orient a different head style or length-to-diameter ratio reliably, which is why the screw specification is the first thing we ask for.

Can screw driving be integrated into an existing assembly line?

Yes. Screw driving stations are regularly added to existing rotary index or in-line assembly cells, sharing the machine PLC and safety circuit. We also build standalone screwing fixtures that a line can adopt without re-engineering the rest of the process.

Send us your component drawing

VR Automation, Bhosari, Pune — riveting, clinching, press and special purpose machines. We quote against your part, not a catalogue.

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