Printable Process-Control Resource

Mass Finishing Sample Trial Record for Small Precision Parts

Use this non-promotional worksheet to define the incoming part, record one controlled finishing trial, compare results, and decide whether the process is ready for a repeat run.

How to use this worksheet

Complete the part and acceptance sections before selecting a machine or recipe.
Photograph representative parts under consistent lighting and mark the critical inspection locations.
Run a small representative batch. Change one primary variable at a time.
Inspect at planned intervals instead of extending the cycle by assumption.
Repeat an acceptable trial before releasing a process window for production.

A. Part and acceptance definition

Field	Record
Trial ID / date / owner
Part name / drawing revision
Material / hardness / coating
Part size / weight / batch quantity
Incoming defect and location
Critical features to protect	Threads / holes / slots / sealing face / sharp edge / cosmetic face / other:
Acceptance criteria	Burr limit, edge condition, dimensions, surface appearance, cleanliness and any approved reference sample:
Inspection method	Visual standard / magnification / gauge / surface measurement / functional test:

B. Trial recipe and load

Process field	Setting or measured value	Why selected
Machine / bowl, tub, barrel or magnetic system
Media material / shape / size / condition
Part load / media load / working volume
Compound / water / concentration / flow
Speed / amplitude / direction
Planned inspection times
Separation / rinse / dry method

C. Inspection results by interval

Time	Burr / defect	Critical edges	Dimensions	Surface / cleanliness	Decision
0 / baseline
Interval 1
Interval 2
Final

D. Failure evidence and next change

Do not record only “pass” or “fail.” Describe where the result appeared, how many inspected parts showed it, and which process variable will be changed next.

Observed pattern	Evidence to record	Next controlled question
Burr remains	Location, direction, size range and affected sample count	Is contact missing, media too large, or process energy insufficient?
Edge changes before burr is removed	Critical edge measurement and comparison photo	Can energy, interval, media or upstream burr size be reduced?
Part-on-part marks or tangling	Part orientation, load composition and affected surfaces	Does the load need more separation, lower part quantity or different motion?
Media lodges in a feature	Feature opening, media dimensions, frequency and removal method	Which shape or size avoids the dimensional match?

E. Repeatability and release

Repeat trial ID and number of repeat batches: ____________________
Process window approved, conditional or rejected: ____________________
Variables that must not change without a new trial: ____________________
Inspection frequency for production: ____________________
Approved by / date / drawing or control-plan reference: ____________________

Methodology and related guides

The worksheet fields are derived from a basic controlled-trial principle: define acceptance first, document the starting condition, change limited variables, inspect representative features, and repeat the approved result before scale-up. For geometry-specific examples, see the guides for stamped metal parts and small fasteners. Equipment selection should follow the actual part, batch and acceptance criteria; the bowl, tub and capacity guide provides the broader decision framework.

The record-first principle can also be adapted to nonmetal workpieces, but the acceptance criteria must be rewritten for the material. Our separately operated jingseyewear site provides an example of a product category where surface appearance, edge condition and deformation risk require their own inspection language.

Version: 1.0, 20 July 2026. You may print or link to this worksheet for internal process planning. When sharing a completed record, remove customer-confidential drawings, part numbers, specifications and photographs unless disclosure is authorized.