Changeover downtime is the gap between finishing one specification and producing good mesh on the next. On a multi-spec gabion line this gap repeats many times, so shortening it pays back quickly. Most of the time is lost not to the mechanical change itself but to trial-and-error: adjusting by feel, running a batch, finding a fault and starting again. A fixed sequence removes that guessing.
Changing mesh size means the twist geometry and opening must reset. Do not simply adjust one setting; work through the twisting setup, the mesh opening and the wire feeding so the new size is produced correctly from the first metre.
A new wire diameter changes guide clearances, tension and speed limits. Confirm the actual diameter, and adjust guides and feeding to match before touching speed. Running a new diameter through old settings is a common cause of a wasted first batch.
Tension must be re-set for each wire diameter and mesh size. This is not optional and should not be estimated. Set it to the new specification, then verify it holds during the trial run rather than assuming the old value still applies.
If the machine is servo or PLC controlled, recall or enter the parameters for the new specification. Stored parameters make changeover repeatable and remove the small variations that creep in when settings are dialled in by memory.
Always run a short trial before committing to full output. The trial proves the new settings work together and exposes faults when only a small amount of material is at risk.
Verify the trial mesh before starting the batch: measure opening size at several points, check the wire is held correctly and confirm the panel matches the specification. Only then begin full production.
Use this sequence every time, and changeover becomes predictable:
Turn the checklist into a written standard operating procedure and keep it at the machine. The procedure should list the correct sequence, the parameter values for each specification, and the measurements that must be taken before full production starts. When every operator follows the same procedure, changeover time becomes predictable and does not depend on who is on shift. Record the start and finish time of each changeover so you can see whether improvements are working. A written procedure also makes training faster, because new operators have a reference rather than relying on memory.
Most lost changeover time comes from a few repeated mistakes. Adjusting tension by feel instead of setting it to the specification causes the first batch to fail and be re-run. Changing speed before checking guides and feeding pushes the new wire outside its comfortable range. Skipping the trial run and going straight to full production puts a whole batch at risk. Mixing wire batches without re-checking diameter introduces variation that looks like a machine fault. Not recording settings means the next changeover starts from scratch. Avoid these and changeover time drops without any new equipment.
Some downtime is built into the machine, not the operator. Stored parameters, quick-release guides and clear scaling reduce the work needed at each change. If you change specifications often, choose a configuration that supports fast, repeatable changeover, and organise your production so similar specifications run together. Grouping batches by mesh size and wire diameter means fewer changeovers in total, which raises available production time without running the machine any faster.
Why does changeover take longer than expected?
Most of the time is trial-and-error. A fixed sequence with a trial run removes most of it.
Do I need a trial run if I have stored parameters?
Yes. Stored parameters are a good start, but wire batches vary, so verify the trial mesh before the batch.
What should I check first after changing wire diameter?
Guide clearance and tension, before speed — a new diameter rarely runs correctly on old settings.
How can I make changeover repeatable?
Follow the same checklist every time and record settings per specification.
Changeover downtime is the gap between finishing one specification and producing good mesh on the next. On a multi-spec gabion line this gap repeats many times, so shortening it pays back quickly. Most of the time is lost not to the mechanical change itself but to trial-and-error: adjusting by feel, running a batch, finding a fault and starting again. A fixed sequence removes that guessing.
Changing mesh size means the twist geometry and opening must reset. Do not simply adjust one setting; work through the twisting setup, the mesh opening and the wire feeding so the new size is produced correctly from the first metre.
A new wire diameter changes guide clearances, tension and speed limits. Confirm the actual diameter, and adjust guides and feeding to match before touching speed. Running a new diameter through old settings is a common cause of a wasted first batch.
Tension must be re-set for each wire diameter and mesh size. This is not optional and should not be estimated. Set it to the new specification, then verify it holds during the trial run rather than assuming the old value still applies.
If the machine is servo or PLC controlled, recall or enter the parameters for the new specification. Stored parameters make changeover repeatable and remove the small variations that creep in when settings are dialled in by memory.
Always run a short trial before committing to full output. The trial proves the new settings work together and exposes faults when only a small amount of material is at risk.
Verify the trial mesh before starting the batch: measure opening size at several points, check the wire is held correctly and confirm the panel matches the specification. Only then begin full production.
Use this sequence every time, and changeover becomes predictable:
Turn the checklist into a written standard operating procedure and keep it at the machine. The procedure should list the correct sequence, the parameter values for each specification, and the measurements that must be taken before full production starts. When every operator follows the same procedure, changeover time becomes predictable and does not depend on who is on shift. Record the start and finish time of each changeover so you can see whether improvements are working. A written procedure also makes training faster, because new operators have a reference rather than relying on memory.
Most lost changeover time comes from a few repeated mistakes. Adjusting tension by feel instead of setting it to the specification causes the first batch to fail and be re-run. Changing speed before checking guides and feeding pushes the new wire outside its comfortable range. Skipping the trial run and going straight to full production puts a whole batch at risk. Mixing wire batches without re-checking diameter introduces variation that looks like a machine fault. Not recording settings means the next changeover starts from scratch. Avoid these and changeover time drops without any new equipment.
Some downtime is built into the machine, not the operator. Stored parameters, quick-release guides and clear scaling reduce the work needed at each change. If you change specifications often, choose a configuration that supports fast, repeatable changeover, and organise your production so similar specifications run together. Grouping batches by mesh size and wire diameter means fewer changeovers in total, which raises available production time without running the machine any faster.
Why does changeover take longer than expected?
Most of the time is trial-and-error. A fixed sequence with a trial run removes most of it.
Do I need a trial run if I have stored parameters?
Yes. Stored parameters are a good start, but wire batches vary, so verify the trial mesh before the batch.
What should I check first after changing wire diameter?
Guide clearance and tension, before speed — a new diameter rarely runs correctly on old settings.
How can I make changeover repeatable?
Follow the same checklist every time and record settings per specification.
