Vibratory Feeder Selection and Feed Rate Calculation

Bowl or linear feeder?

A vibratory bowl feeder moves bulk components along a spiral track. Component-specific tooling separates unsuitable orientations so that correctly positioned parts reach the outlet. Screws, pins, plastic components and fittings require an assessment of their individual geometry rather than a single tooling arrangement for every part.

A vibratory linear feeder usually transfers components that have already been oriented. Its track connects the bowl outlet to the machine, preserves orientation and provides a controlled queue. Bowl and linear feeders serve different functions and may operate together in the same feeding system.

Define how the component will be presented at the final delivery point: as a continuous stream, individually released by an escapement, or at a fixed position for robotic pickup. This decision affects track geometry and sensing requirements. Refill arrangements, coatings and controls need a separate application assessment.

Component and process analysis

Outside dimensions alone are insufficient. Centre of gravity, asymmetry, holes, projections and a tendency to interlock or overlap influence orientation methods. Two similar components may behave differently on a track because of tolerances or surface condition. Identify all revisions and variants expected to run on the system at the beginning.

Material, oil, burrs, coatings and surface sensitivity change contact behaviour. Samples should represent actual production conditions. A test with a clean prototype does not by itself establish how oily production parts will feed. Where surface marking matters, define the acceptance criterion with visual examples and an inspection method.

Mark the required outlet orientation on a drawing or photograph. Specify which face must point upwards, which axis must follow the track and the position at the pickup point. Include the receiving station’s entry geometry and pickup motion; a general instruction such as “deliver flat” is too ambiguous for tooling design.

Provide the available footprint and height, outlet coordinates, maintenance access and surrounding equipment. The total moving mass of track and components affects drive selection. A drive’s published weight is its own mass and should not be interpreted as the load it can carry.

Calculate the required feed rate

Calculate the required feed rate from machine consumption. If a station consumes n components per cycle and its cycle takes t seconds, theoretical continuous consumption is Q = 60 × n / t parts per minute. Where several pickup points share a feeder, consider their combined consumption.

Example: a station using one component every two seconds theoretically consumes 30 parts per minute. This is an illustrative calculation, not a measured or guaranteed output for a TUTUS model. Interruptions, restart behaviour, orientation losses and the pickup method require additional assessment.

State the average target together with any short-term peak demand and cycle variation. Appropriate capacity headroom depends on application testing and line behaviour; one percentage cannot be assumed for every component. Measure correctly oriented parts delivered to the machine interface, rather than movement speed inside the bowl alone.

Size the buffer queue

A buffer queue can accommodate a short-term difference between bowl supply and station consumption. If the bowl stops supplying for Δt seconds while the machine continues consuming Q parts per minute, theoretical buffer demand is N = Q × Δt / 60 components. The same calculation does not directly apply when the consuming machine itself has stopped.

At 30 parts per minute, a 20-second supply interruption requires a theoretical buffer of 10 components. This is before allowances for sensing positions, usable queue space and any agreed margin. If components have a centre-to-centre pitch of p millimetres on the track, approximate queue length is N × p; transfer zones and mechanical clearances require additional space.

Excessive accumulation or insufficient replenishment can disrupt the receiving station. Define queue sensing, feed-stop and restart conditions with the machine interface. The catalogue length of a VL drive is not the usable length of a buffer track.

Select a TBS / VL model

The current standard bowl feeder range comprises TBS 280 S, TBS 400 S, TBS 500 S and TBS 650 S. Bowl diameter and volume provide an initial dimensional comparison. Model selection should also consider working fill level, the orientation path and actual component behaviour rather than volume alone.

The linear range comprises VL 250, VL 470 and VL 800. The lengths below are the drive’s overall L1 dimensions. For example, VL 470 has an overall length of 465 mm; the model code is not a substitute for a dimension. Track shape, mass and mounting need separate assessment.

VA expresses electrical apparent power, whereas litres describe bowl volume. Neither directly determines parts per minute. CS cylindrical bowls and CK stepped bowls also have their own dimensional tables. For example, the CS 150 outside diameter is 155 mm and the CK 650 outside diameter is 860 mm. Treating a series code as its outside diameter can lead to layout errors.

TBS values are based on the supplied technical sheet. VL values are retained from the existing catalogue dataset and should be confirmed against the current engineering drawing and application requirements before ordering.

Prepare a technical enquiry

A clear technical enquiry supports an assessment of the appropriate feeding concept. Collect the following information in one request. Mark unresolved requirements as “not yet defined” rather than presenting estimates as confirmed specifications. Sample quantity and shipment arrangements can be agreed during the project discussion.

For an existing feeder modification, describe both the desired outcome and the observed problem: incorrect orientation, overlapping, surface marking, an empty queue or a jam at the transfer point. Identify the component variant and operating conditions under which the issue occurs.

Acceptance testing and operation

Define test conditions before the technical evaluation: which revisions and samples will be used, the bowl fill-level range, and where and for how long output will be measured. Assess average delivery rate alongside incorrect orientations, surface marking, jams and flow after a stop.

A result obtained with a feeder running independently does not fully describe its behaviour in an integrated machine. Also evaluate queue filling while the machine is not taking parts, flow when demand resumes, and final positioning at pickup. These are suggested evaluation topics; project-specific acceptance conditions are agreed during the quotation and engineering discussion.

During operation, record changes in components and surface condition. Check track contamination, loose connections, outlet accumulation and sensing behaviour in accordance with the manufacturer’s maintenance instructions. Electrical or mechanical adjustments require authorised personnel and the applicable safe working procedure.

Start a discussion with TUTUS by sharing your component drawing, target feed rate and machine layout together. Bowl feeding, linear transfer, bowl selection and accessory requirements can then be assessed against the same application.