Short answer: Progressive die pilot and strip feed problems should be reviewed when stamped parts show hole shift, uneven burrs, short feed, misfeeds, station-to-station drift, or inconsistent forming. The RFQ or corrective-action request should define strip layout, pilot hole size, pitch, carrier strength, feed direction, sensors, material coil condition, sample timing, and measured defect pattern.
A progressive die problem is not always a bad punch or wrong tolerance. Feed length, pilot entry, strip lift, carrier stretch, coil camber, slug pull, sensor timing, and tool wear can all move features across stations. Buyers see the result as hole mismatch, burr growth, cracks, or assembly failures.
Use this page with the progressive die design checklist, strip layout and carrier design guide, die maintenance and tool life guide, and tooling tryout and sample approval guide.
Feed troubleshooting evidence to collect
| Evidence | Why it matters | What to share |
|---|---|---|
| Defect pattern | A repeat pattern can point to a station, feed pitch, or sensor timing issue. | Marked samples, station number, coil lot, and run time. |
| Pilot condition | Worn, undersized, or late pilots can allow strip drift. | Pilot hole size, pilot wear, entry timing, and clearance. |
| Carrier strength | Weak carriers can stretch, twist, or lift before critical stations. | Carrier width, bridge areas, strip lift, and progression pitch. |
| Press setup | Feed speed, lubrication, straightener, and coil condition affect stability. | SPM, feed length, feed line setup, lubrication, and coil notes. |
Read the defect pattern before changing the die
If every part is off by the same amount, the issue may be datum or tool setup. If the error grows across the strip, it may be pitch drift or carrier stretch. If the error appears every few hits, the feed, straightener, sensor, or coil condition may be involved. Changing punches without mapping the pattern can hide the real cause.
Ask for samples marked by coil lot, run time, and defect location. Photos should show the part, strip, and carrier where possible. For measurement planning, connect this page to the critical dimensions inspection plan and the SPC process capability guide.
Review pilots, carriers, and sensors together
Pilot holes do not solve every feed problem. The pilot must enter at the right time, the hole must be stable, and the carrier must support the strip until critical features are finished. Thin material, narrow carriers, large cutouts, or heavy forming stations can let the strip move before the pilot can correct it.
Sensor and error-proofing choices also matter. A missed short feed can destroy a die or produce a lot of suspect parts. If the part has critical feed-related risk, use the in-die sensor and error-proofing guide and the press tonnage and capacity guide during the review.
RFQ or corrective-action details to include
- Part drawing, strip layout, progression pitch, feed direction, pilot hole size, carrier width, and critical station sequence.
- Material grade, thickness, temper, coil width, coil camber concern, lubrication, and surface condition.
- Defect samples marked by date, coil lot, press, station if known, run speed, and measurement result.
- Feed setup: feeder type, straightener, SPM, feed length, pilot release timing, sensor locations, and stop condition.
- Tooling history: sharpened punches, replaced pilots, die maintenance, tryout notes, and last accepted sample lot.
- Expected corrective action evidence, containment plan, sample quantity, and production restart timing.
How to compare supplier answers
A useful answer explains how the supplier will separate feed, pilot, tool wear, material, and measurement causes. A weak answer only says the die will be adjusted. For repeat problems, ask for before-and-after data rather than only corrected samples.
If the issue affects shipped parts, define containment separately from root cause. Sorting current inventory does not prove the die is stable. The production restart should include a controlled run, inspection frequency, and what signal will stop the press if the defect returns.
Send strip layout, samples, measurement data, and production history through the contact page. If the problem is still unclear, use the RFQ form to request a troubleshooting review before committing to new tooling.
FAQ
What causes progressive die strip feed problems?
Common causes include pilot wear, short feed, carrier stretch, strip lift, coil camber, slug pull, sensor timing, lubrication, or tool wear.
Are pilot holes enough to control strip position?
Not always. Pilot holes help, but carrier strength, station sequence, feed setup, and material behavior also affect position.
What evidence helps diagnose feed drift?
Marked samples, strip photos, station information, coil lot, run speed, feed setup, pilot condition, and measurement trends are useful.
What should be sent for a strip feed troubleshooting RFQ?
Send part drawings, strip layout, material, feed setup, defect samples, measurement data, tool history, run condition, and target restart timing.