How to Select a Flexible Feeding System

The right flexible feeding system is selected from the actual part and process—not from feeder size alone.

Before requesting a quotation, define the part geometry, material, surface condition, incoming state, required output orientation, target cycle, accuracy measurement method, variant range, downstream equipment, and acceptance criteria. These factors determine the required supply hopper, flexible feeder, positioning method, camera, handling mechanism, workstation, control system, and tooling.

Use this guide to prepare a technically complete RFQ and reduce avoidable changes during design, testing, and commissioning.

Define the Part Before Selecting Equipment

Record the Basic Part Data

Provide:

• Part name and drawing number;
• Length, width, and height;
• Weight;
• Material;
• Surface finish;
• Center of gravity if relevant;
• Dimensional tolerances;
• Annual or batch production quantity;
• Number of variants.

Identify Handling Risks

Confirm whether the part is:

• Scratch-sensitive;
• Fragile or easily deformed;
• Oily or adhesive;
• Magnetic;
• Static-sensitive;
• Transparent or reflective;
• Dark, glossy, or low-contrast;
• Likely to tangle, nest, overlap, or stick;
• Difficult to distinguish between front, back, left, or right.

These characteristics influence feeder selection, surface treatment, lighting, camera configuration, separation method, tooling, and retry logic.

Provide Representative Samples

If physical sample testing is available, the samples should represent the actual production range—not only ideal parts.

Include:

• Normal parts from multiple production lots;
• Upper and lower dimensional limits;
• Expected surface variation;
• Deformed or contaminated parts that may occur in production;
• All variants intended for the same system;
• Packaging or incoming conditions that reflect real production.

Describe How Parts Enter the System

The same part may require different feeding methods depending on its incoming state.

Document whether parts arrive:

• In bulk;
• In bags;
• In layers;
• Stacked;
• Nested;
• Tangled;
• On trays;
• From a conveyor;
• From an upstream machine;
• By manual loading.

Also define:

• Batch quantity;
• Refill frequency;
• Acceptable contact and drop conditions;
• Whether parts can be mixed;
• Whether empty, damaged, or incorrect parts may enter;
• Whether the process must detect low material level;
• Required buffer time before refill.

A supply hopper should be selected according to part behavior, storage requirement, refill method, surface protection, and stable delivery—not by volume alone.

Define the Required Output Orientation

The feeding system must know what a successful output looks like.

Provide:

• A marked drawing or photograph of the required orientation;
• The pick-up point;
• The placement point;
• Acceptable orientation tolerances;
• Whether mirrored or rotated orientations are acceptable;
• Required spacing between parts;
• Whether the downstream process can correct orientation;
• Reject and retry requirements.

If several orientations are acceptable, state them clearly. Reducing unnecessary orientation constraints can simplify the feeding concept and improve achievable output.

Calculate the Real Cycle Requirement

Do not specify only “high speed.” Define the target as:

• Parts per minute;
• Seconds per part;
• Parts per cycle;
• Required average output;
• Required peak output;
• Maximum acceptable stoppage;
• Buffer requirement.

The complete cycle may include:

1. Hopper delivery;
2. Part separation;
3. Settling or presentation;
4. Image capture;
5. Recognition or position calculation;
6. Retry or reorientation;
7. Pick-up;
8. Transfer;
9. Placement;
10. Inspection or confirmation;
11. Downstream wait time;
12. Refill and recovery time.

Ask the supplier to state which steps are included in the quoted cycle time.

Define Accuracy as a Testable Requirement

An accuracy number is incomplete without a definition.

Specify:

• Positioning, placement, repeatability, recognition, or overall system accuracy;
• X, Y, Z, and rotational requirements where relevant;
• Datum and measurement point;
• Tool-center point;
• Part and fixture condition;
• Operating load and speed;
• Sample quantity;
• Test duration;
• Measurement equipment;
• Pass/fail rule.

Example of an Incomplete Requirement

Required accuracy: ±0.15 mm

Decide Whether Vision Is Required

A camera may support different tasks:

• Part presence detection;
• Position calculation;
• Orientation recognition;
• Correction or alignment;
• Pick-point generation;
• Identification;
• Inspection;
• Placement confirmation.

Do not assume that a camera-equipped feeding system automatically performs defect inspection.

Before requesting vision functions, define:

• The exact decision the camera must make;
• Part features used for recognition;
• Field of view;
• Required resolution;
• Lighting conditions;
• Part color and surface variation;
• Acceptable false-positive and false-negative behavior;
• Calibration method;
• Image-storage and traceability requirements;
• Communication with the controller or host system.

Compare the Main Feeding Approaches

This table is a selection framework, not a universal performance ranking. The correct method depends on the real process and commercial constraints.

Select the Required System Modules

A flexible feeding solution may include:

Supply Hopper

Used for material storage and controlled delivery. Confirm capacity, refill method, part damage risk, bridging, level detection, and control.

Flexible Feeder

Used to present parts for recognition or pick-up. Confirm part range, active area, surface behavior, changeover, presentation logic, and achievable output under test conditions.

Positioning System

Used where additional positioning or controlled presentation is required. Confirm the exact function, supported part range, accuracy definition, and integration method.

Camera or Vision Component

Used for position, orientation, identification, correction, or inspection depending on the project. Confirm the exact task rather than using “vision system” as a general claim.

Handling Mechanism

May include a robot or another actuator. Confirm payload, reach, movement path, tooling, speed, collision clearance, and downstream placement.

Workstation and Controls

Integrates modules, operator controls, safety, I/O, communication, alarms, recipes, and interfaces. Confirm standard and optional functions.

Vibration Isolation

May be required when adjacent vibrating equipment causes interference. Confirm applicable models, mounting structure, spacing, operating conditions, and validation method.

Plan for Product Changeover

If one system must handle multiple products, define:

• Number of part variants;
• Dimensional and material differences;
• Different output orientations;
• Different cycle targets;
• Required tooling changes;
• Recipe changes;
• Camera and lighting adjustments;
• Feeder surface changes;
• Changeover time target;
• Operator skill level;
• Validation after changeover.

Review the Installation and Interfaces

Machine dimensions alone do not define the required installation space.

Include:

• Machine footprint;
• Robot, nozzle, or handling movement;
• Hopper loading space;
• Operator access;
• Maintenance and replacement clearance;
• Camera and lighting clearance;
• Cable and pneumatic routing;
• Upstream and downstream transfer points;
• Safety guarding and emergency access;
• Base and floor conditions;
• Transportation route and door dimensions.

Confirm:

• Voltage and frequency;
• Power consumption;
• Air pressure, quality, and flow;
• PLC and I/O;
• Supported communication protocols;
• Data exchange;
• Alarm and recovery logic;
• Safety circuit;
• Network and cybersecurity requirements where relevant.

All final values and service terms must be confirmed in the technical and commercial agreement.