What the Measurements Mean
Gear accuracy is checked on several characteristics. Profile error shows how far the tooth form departs from a true involute. Lead error shows deviation along the face width, important for load distribution.
Pitch error covers adjacent and cumulative tooth spacing. Runout shows eccentricity of the pitch circle to the bore. Tooth thickness is verified by span, over-pins or over-balls, or by a checking gage.
The drawing specifies a grade, and the report compares each measured value to the tolerance for that grade, module and size. Older prints use AGMA 2000 quality numbers (Q-numbers), newer ones use AGMA 2015-1 A-grades, and some use ISO 1328-1 grades, so know which standard the customer means.
What a Good Report Contains
Customers and auditors look for traceability as much as numbers. A complete report ties the measurements to a specific part, lot and drawing revision, and states the instrument and its calibration status.
- Part number, drawing revision, lot or serial number, operator and date
- Gear data table values and the grade standard used
- Measured lead, profile, pitch, runout and tooth thickness with charts
- Which teeth were measured, and the sampling plan
- Instrument ID, software version and calibration due date
- Pass or fail summary and any nonconformance reference
Gear Checkers, CMMs and Software
Dedicated gear measuring centers (Klingelnberg, Gleason, Zeiss and similar) and CMMs with gear software produce the charts and a PDF or data file. The weak point is usually the file handling: reports saved on a local PC, named inconsistently, then retyped into a customer's format or an AS9102 form. Standardize file naming by part, revision and lot, and store reports in a place the ERP can link.
If inspectors export results as CSV or QIF data, you can load them into the quality system instead of retyping.
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Gear RFQ and Manufacturing Inquiry Template
A complete request-for-quote sheet for custom gears, pinions and splined shafts, so the supplier can price without back-and-forth emails.
Audit and Customer Requirements
Aerospace and defense customers may require a first article report in AS9102 form, wind and mining customers may ask for full reports on every unit, and automotive work can require PPAP elements. Shops certified to ISO 9001 or AS9100 need controlled records and gage calibration traceability. When a customer asks for the report for a gear shipped three years ago, the time spent finding it is a cost.
Keep reports retrievable by part number, lot, serial and customer PO, with the retention period your contracts require.
Where AI Can Help With the Paperwork
A private AI assistant can read gear checker PDFs, extract the measured values and tolerances, compare them to the drawing's grade, draft the customer's report format and flag missing items such as an expired calibration or an unmeasured characteristic. It can also answer questions like which lots of a part ran near the lead tolerance limit last year. It does not decide conformance: the quality manager does, and any write-back to the ERP or quality system needs human approval.
If you ship small volumes with a simple report format, manual handling may be enough.
Frequently asked questions
What is the difference between AGMA 2000 and AGMA 2015-1?
AGMA 2000 used quality numbers where a higher number meant tighter tolerance. AGMA 2015-1 uses A-grades with a different tolerance system aligned with ISO practice, where a lower number is tighter. Check the print and the customer's specification to know which applies, and do not convert grades without confirming with the customer.
What does a gear inspection report need to show?
Part, revision and lot identity, the standard and grade, measured lead, profile, pitch, runout and tooth thickness against tolerance, which teeth were measured, the instrument and calibration status, and a conformance statement. Customer or industry forms such as AS9102 add more fields.
Do we have to inspect every gear?
Not necessarily. It depends on the drawing, customer quality clauses and risk. Many shops use a sampling plan with full checks on the first piece and at set intervals, while critical applications require every part. Follow the purchase order and quality requirements.
Share a sample gear checker report with Netray and see extracted values and a draft customer report generated privately, for your quality manager to approve.