How to Plan the Layout of Tooling Conveyor Lines
A step-by-step method for process engineers laying out tooling conveyor lines in a machine shop. Walk the flow, measure the parts, size the buffers, then set transfer heights and controls. By the end you can judge whether a conveyor belongs in the cell at all, and what it must handle if it does.
Key takeaways
Start With the Real Flow, Not the Drawing
The layout of tooling conveyor starts on the floor, not in CAD. Before you move anything, walk the route a part actually takes from incoming inspection to the shipping pallet. Write down every touch: machine, deburr bench, wash, gauge station, packaging. Most shops find two or three touches nobody remembered, and they sit exactly where the congestion is.
Count the moves per part and time each one with a stopwatch. A 4 kg aluminum housing moved 6 times a shift is 6 chances to drop it, scratch it, or queue it behind something else. That number, not the machine cycle, is usually what sets your day rate.
Record the direction each operation pushes parts. If one station discharges to the left and the next one accepts from the right, the part has to loop back, and that loop becomes a buffer whether you planned one or not.
At this stage ignore conveyors completely. You are mapping demand and sequence. Anything else is a solution looking for a problem.
Match Conveyor Type to Part Geometry and Volume
Part geometry decides the conveyor family long before price does. Flat plates with a finished face need belt or slat support so the surface never slides on a metal edge. Shafts, bushings and small turned parts roll, so they belong in a cleated belt or a pallet fixture.
Volume sets the drive. Below roughly 200 parts per shift, a gravity roller section with a manual push does the job and costs almost nothing to maintain. Above that, a powered belt with variable frequency control pays back within a few months because it removes a person from the loop.
Weight per meter matters more than weight per part. Twenty 300 g fittings spaced 200 mm apart load a belt differently than one 6 kg casting in the same space. Check the load rating against the worst case spacing, not the average.
If the part is too heavy, too hot, or too sharp-edged for a belt, stop and look at an indexing table or a pallet shuttle instead of forcing a conveyor into the cell.
Size Buffers and Set the Transfer Heights
A buffer exists to absorb the gap between two cycle times. Take the slower of the two stations as your takt, then multiply by the number of parts you need to survive a 5-minute stoppage. A station running a 45-second cycle needs at least 7 parts of accumulation to ride out one tool change.
Transfer height is where most layouts quietly fail. Keep the working surface between 750 mm and 1,100 mm above the floor for a standing operator. Below 750 mm they bend at the waist; above 1,100 mm they lift above the shoulder. Both cost you 1–2 seconds per pick, which compounds across a shift.
Set the conveyor centerline so the part enters the fixture at the same height the fixture presents it. A 50 mm step forces the operator to lift the part off the belt and place it, and that single step is often the whole cycle-time difference.
Leave 150–200 mm of clearance on the far side of the belt. Operators need somewhere to put a rejected part besides the floor.
Integration, Controls and the Mistakes That Cost Weeks
A conveyor is only as good as its handshake with the machine. Confirm the discharge height, the signal type, and the timing before you bolt anything down. A 24 V photo-eye that fires 200 ms after the part clears the guard is fine. One that fires on the leading edge will jam the next part into the fixture.
Decide who owns the stop button. If the machine operator can stop the belt but not restart it, you have created a waiting state at every fault. Wire the conveyor so a single operator can clear a jam and restart from the same panel.
Three mistakes show up again and again. Routing the belt under a coolant line. Running power and signal cable in the same tray. And leaving no access panel for the drive, so a 20-minute belt change becomes a 4-hour job.
If a part needs more than two orientation changes between operations, reconsider the conveyor route. Sometimes the cheaper answer is two short belts feeding one cell instead of one long loop around the shop.
Step by Step: Building the Layout
Work in this order. Skipping step 2 is the most common cause of a rebuild.
- 11. Time the current routeWalk the part path twice, once at shift start and once after lunch. Log each move and its duration. Differences between the two walks show you where the queue actually forms.
- 22. Fix the sequence before the hardwareReorder operations so material moves in one direction. If two stations still face opposite ways, add a return loop only after you have tried swapping their positions.
- 33. Pick the conveyor familyBelt for flat finished parts, roller for rigid boxes, cleated belt for small turned parts, pallet fixtures for heavy or odd shapes. Match stiffness to part weight, not to the catalog photo.
- 44. Set takt and buffer countTakt equals the slowest station cycle. Multiply by the stoppage minutes you want to survive, then round up. A 40-second takt and a 5-minute target gives 8 parts of accumulation.
- 55. Fix transfer heights at 750–1,100 mmMeasure from the floor to the fixture locating face, not to the machine table. Add the fixture height if the operator loads off the belt.
- 66. Wire the handshakeConfirm discharge height, signal voltage and trigger timing with the machine builder. Test with an empty belt first, then with 20 parts, before running production.
- 77. Run a one-shift trial and measureTrack parts per hour, jams per shift, and operator steps. If jams exceed two per shift, the trigger timing or the guide rails need adjusting, not the speed.
Which Conveyor Fits Which Job
Match the part and the volume before you request pricing.
| Situation | Best fit | Why |
|---|---|---|
| Flat plate, finished face, 300 parts/shift | Powered belt, low-friction top | Surface never slides on a metal edge |
| Small turned parts under 150 g | Cleated belt with side guides | Parts stay in pockets, no rolling |
| One 6 kg casting per 4 minutes | Pallet shuttle or indexing table | Belt load rating and tracking suffer |
| Under 200 parts/shift, short distance | Gravity roller, manual push | No drive to maintain or wire |
| Two stations facing opposite ways | Two short belts into one cell | Avoids a long loop around the shop |
| Hot parts above 80 °C | Chain or slat conveyor | Belts deform and lose tracking |
Fix the Flow First, Buy the Belt Second
If your takt is set by one slow station or your route still doubles back, no conveyor will help. Walk the flow, level the cycles, then specify the hardware.
Conveyor Layout Questions Engineers Ask
How wide should the belt be relative to the part?
Add 100–150 mm to the widest part dimension, split evenly on both sides. That gives the operator room to grab the part without pinching fingers against a guide rail.
If parts vary in size across a family, size the belt for the largest part and use adjustable guide rails for the rest.
Can we run a conveyor through a wash station?
Yes, but only if the belt material and the drive are rated for the wash chemistry and temperature. Standard PVC belting degrades fast in alkaline wash at 60 °C.
Better practice is to end the conveyor at the wash and restart it on the other side, so the wash cabinet keeps its own enclosure.
What speed should the belt run at?
Set belt speed so a part takes 1.5 to 2 times the takt to travel between stations. Faster than that and parts arrive before the operator is ready, which builds a queue at the infeed.
Variable frequency control is worth the cost if you run more than one part family on the same line.
How do we handle a rejected part mid-line?
Plan a reject lane at every inspection point. A short gravity section that drops into a red bin at 750 mm height works and needs no power.
Never let a rejected part continue to the next station. It will be loaded into a fixture and the error compounds.
Do we need guarding on a slow belt?
Any nip point between belt and pulley needs a guard regardless of speed. Slow belts still pull gloves and sleeves.
Also guard the drive enclosure and any transfer gap wider than 4 mm where fingers can reach a moving edge.
When is a conveyor the wrong answer?
When the bottleneck is a single long machine cycle, when parts are handled fewer than 30 times a shift, or when the route changes every week.
In those cases a kart, a gravity rack, or simply relocating a bench will cost less and adapt faster.
Send Us Your Part and Route
Upload drawings and we return a quotation with free DFM analysis within 12 hours. Tolerances held to ±0.005 mm, 100% inspection before shipment.
12-hour quote100% inspectionNo minimum order quantity
More process notes from the shop floor
We publish setup notes, tooling trials and inspection data from the factory floor.
