A line where every machine runs at a different speed can look busy and efficient from the walkway. Each operator has tuned their own machine to feel comfortable, and nobody has asked what the line as a whole can deliver. The mismatch shows up as accumulators swinging between empty and full, short bursts of starvation and blocking, and output that never reaches rated capacity. An uneven line speed diagnostic compares machine speeds, finds the gaps and shows where capacity is leaking. Teams can compare every machine speed on their own line against its target and spot the mismatch.
When Every Machine Runs Its Own Speed, the Line Loses Capacity
iFactory line diagnostics compare machine speeds, buffer behavior and microstops to show where uneven speed hides real capacity losses.
Speed by Machine Against the Line Target
The dashed line is the speed the line should run. Machines above and below it create the swings in between.
Illustrative speeds. A real audit uses measured rates per machine.
Why Uneven Speed Hides the Loss
The mismatch is rarely visible in a single number. These effects cover it up.
Conservative speed settings
Operators run slower than needed to avoid trouble, and nobody questions it
Buffers mask the gap
Accumulators absorb mismatch until they run empty or full
Microstops look normal
Short stops are accepted as part of running
Averages blur peaks
Hourly output hides the swings within the hour
Questions the Diagnostic Answers
Each question points to a measurement and a likely action.
| Question | What to Measure | Typical Finding |
|---|---|---|
| Which machine sets the real pace? | Speed and queue per machine | Slowest sustained step |
| Where do buffers swing? | Accumulator level over a shift | Mismatch between neighbors |
| Is speed set by habit or by need? | Set speed against rated speed | Unused headroom |
| How often do short stops occur? | Stop count and duration | Minor stops that add up |
Speed Gap by Machine
Compare each machine with the speed the line needs. The widest gaps deserve attention first.
Illustrative gaps. Your own line gives the real picture.
See Where Uneven Speeds Are Costing You Output
Share machine speeds and accumulator data from one shift. We will show the gaps and the first settings to align.
A Five-Step Line Speed Diagnostic
Work from measurement to a speed plan the whole line can hold.
How Serious Is the Mismatch
A simple three-level grade helps decide what to fix first.
From Diagnostic to Steady Speed
Fix the largest gap first, then repeat.
Common Root Causes of Uneven Line Speed
Speed differences have causes, and the causes suggest the fix.
Local tuning
Each operator sets speed to what feels comfortable on their machine
Old settings
Speeds set years ago for a different product or format
Hidden limits
A guide, sensor or transfer that cannot take higher speed
The Role of Speed by Machine Type
Not every machine should run at the same rate. Each has a job in the line.
| Machine | Speed Role | Common Issue |
|---|---|---|
| Filler | Often sets the pace of the line | Set above what downstream can take |
| Capper or sealer | Must keep up with the filler | Slows after minor stops |
| Labeler | Slightly faster than the filler for margin | Set too close to the filler speed |
| Case packer | Needs headroom to clear the buffer | Pace limited by case supply |
Individually Tuned vs Line-Tuned Speeds
The best setting for one machine can be the worst for the line.
Setting a Line Pace Step by Step
Move from the constraint outward so each setting has a reason.
What Mismatch Does to the Line
The cost shows up in several places at once.
Illustrative relative effects. Your own line data shows the real mix.
What Experienced Line Engineers Look For in a Speed Audit
Frequently Asked Questions
Is faster always better for each machine?
No. Matching neighbors matters more than raw speed. A machine running faster than the one after it only fills a buffer. A machine slowed slightly to match its neighbor often stops less, and the steadier flow can raise line output even though that one machine runs below its rated speed. Share the reasoning with operators when speeds change, because settings tend to drift back unless people understand why the line was matched. Compare your machine speeds in a line-level view with our team.
How do we measure true machine speed?
Use counts and run time from controllers, not nameplate or set speed. Compare against rated speed and the line target to see where there is headroom or a limit. Count good units over a measured run time and exclude planned stops, so the figure reflects what the machine truly delivers while it is running. Use the same method on every machine so results are comparable, and note the product and format running, since speed targets differ between them.
Can buffers hide a speed problem permanently?
Only until they fill or empty. Then the mismatch shows up as blocking or starvation. A buffer is a shock absorber, not a cure, and once it reaches empty or full the mismatch passes straight through to the machines on either side. Watching how long a buffer stays near empty or full is a useful warning sign, since long stretches there mean the mismatch is costing output. See how buffer swings reveal the mismatch on a short walkthrough.
Will matching speeds reduce output at some machines?
Sometimes, and that is acceptable. A machine slowed to match its neighbor often runs steadier, with fewer stops. The goal is line output, not machine output. Record both machine output and line output before and after the change, so the team can see that the line gained even where one machine gave up speed. Where a machine sits well below its rated speed after matching, check whether a guide, sensor or transfer is limiting it and could be improved.
How often should speeds be reviewed?
After any product, format or equipment change, and regularly otherwise. A quick monthly check of speeds against targets catches drift early, while a full audit is worth repeating after any significant equipment or product change. Keep a short log of speed changes with dates and reasons, so later reviews can tell a planned change from an unexplained drift. Plan a review rhythm that fits your line on a call.
Give Your Line One Speed It Can Actually Hold
Bring a shift of speed and buffer data. We will show the mismatch, the cost and the first settings to change.
