Drawing & feature
- Component print (PDF/STEP as available)
- Finished hole / face tolerances
- Pre-hole or prior-op notes
FROM PROTOTYPE TO APPROVED TOOL
Sample Validation Process
HENTRY uses sample validation to prove a custom cutting tool against agreed part results—before repeat production. Distributors, OEM/ODM buyers and end users share one acceptance plan so trial feedback can revise the tool without ambiguity.
Start validation → RFQWhen a sample tool fits
A sample (trial) tool is appropriate when the print, material and machine path are stable enough to judge geometry—but not yet locked for volume. Typical triggers:
- New PCD reamer or solid carbide drill design from a drawing
- Material or silicon content change that alters wear mode
- Failure mode (breakage, oversize, burr, packing) that needs a controlled countermeasure
- Distributor quoting an end-user print and needs evidence before stocking
If the requirement is still changing weekly, fix the process notes first—then sample.
What to submit
Material & volume
- Alloy / hardness / Si% if known
- Annual volume and lot size
- Current tool and failure photos
Machine reality
- Machine, holder, assembled runout
- Coolant (flood / through / MQL)
- Gauge method for acceptance
Field lists that speed quotation: PCD reamer RFQ checklist · solid carbide drill RFQ checklist · Engineering RFQ.
Eight controlled stages
1. Application review
Confirm drawing, material, hole geometry, machine, holder, coolant and the problem the sample must address.
2. Design confirm
Agree tool architecture, diameters, coolant outlets, inspection points and revision ID before metal is cut.
3. Make & inspect
Manufacture the sample; inspect dimensions, runout and critical edges. Process evidence: manufacturing & quality evidence.
4. Customer trial
Run under agreed speeds/feeds, coolant and holder. Record chips, sound, wear and part results.
5. Feedback data
Return measured size/finish/position, tool photos, chip photos and any parameter changes made on the floor.
6. Revision
If needed, revise geometry or process notes against the same acceptance table—do not mix uncontrolled changes.
7. Release
Freeze the approved revision for repeat supply. Keep the acceptance table with the PO.
8. Lifecycle
Plan regrind/recondition rules and re-validation triggers for critical bores.
What “pass” means for bore trials
For reamed or drilled precision bores, agree the pass table before the first cut. Typical columns include diameter (and taper if measured), roundness/cylindricity if the print requires it, surface finish location, visual chip/burr condition at exit, and any go/no-go gauge the line already uses. Record machine, holder, coolant, and pre-hole state with each data point. Do not treat a single “good feel” part as release—release follows the agreed sample scope and revision step.
Agree on acceptance before the trial
Tool specification
- Tool dimensions and interface
- Assembled-tool runout
- Cutting-edge inspection points
Part result
- Hole size, position and finish
- Burr, chip and wear condition
- Measurement method
Trial conditions
- Material and machine setup
- Cutting data and coolant
- Defined quality or wear endpoint
Fees vs production (how to think about cost)
Sample tools and production tools are priced from scope—geometry complexity, PCD vs carbide, inspection depth and quantity. HENTRY does not publish fixed catalog sample prices here because prints differ. Ask for a sample proposal in the RFQ; production pricing follows the released revision and volume. No invented percentage discounts or “guaranteed life” multipliers.
IP and confidentiality
Customer drawings and process notes are treated as confidential project inputs. Share only what is required for design and inspection. For private-label or distributor programs, branding and packaging rules are confirmed in writing before release. See distributor cutting tool program and OEM/ODM cutting tools.
Distributor sampling for an end user
Distributors may request samples on behalf of an end user. Provide the end-user print (or sanitized equivalent), the target machine conditions and who will run the trial. Acceptance still belongs to the part result—not to a catalog claim.
Sample Quantity Bands (Heuristic)
Sample quantity is a planning band, not a catalog SKU. Agree the band in writing before metal is cut.
Picture the first-off that “looked fine” on a shop mic, then failed quality on a different fixture. That is why the band and the gauge plan get written down before we cut metal—not after the argument starts.
| Band (heuristic) | Typical purpose | What “enough” usually means |
|---|---|---|
| Functional / concept sample | Prove tool can enter the feature and leave a measurable bore | Few parts under agreed holder/coolant—enough to see size, burr, chip form |
| Process / capability sample | Stabilize parameters, offsets, and scrap mode on the production route | A short run long enough to see drift, interventions, and wear trend—not a life certificate |
| Release / PPAP-style sample | Freeze the tool revision for production supply | Quantity and inspection plan written before trial; results tied to tool revision ID |
Ranges and lot sizes belong in the quotation / validation plan. Do not treat a website number as a promise. If a calendar window or sample fee is needed, mark it agree-in-writing before trial—no invented “fixed 14 days” or “fixed $X” on this page.
Related products when scoping the trial: Custom PCD Reamer · Solid Carbide Drill.
Acceptance Must Be Written Before Trial
Before the first sample cut, freeze in writing:
- Which characteristics are in scope this round (diameter, form, roughness, burr, cycle time, wear observation—each yes/no).
- Gauge method, temperature practice, and sampling plan.
- Pass / fail ownership (buyer vs HENTRY vs joint review).
- What is out of scope this round (e.g., life claims, line takt proof, multi-machine transfer).
Unwritten “we will see” acceptance turns every soft scrap into a commercial dispute. Tool material and drawing revision alone do not define acceptance.
Revision Rounds — Process Language
Validation is revision-controlled:
- Included rounds: the quotation / validation plan states how many drawing or geometry revision loops are included in the sample package.
- Trigger for a new round: measured failure against the pre-agreed acceptance list, or a buyer-requested print change.
- Beyond included rounds: requote or amend the validation plan before the next grind/build—do not assume “keep iterating until it works” is free.
- Freeze: approved results are recorded against a specific tool revision ID before repeat supply.
No universal “two free revisions” claim on this page unless business confirms it in writing for that order.
Fees vs Production Credit
Sample / validation activity may carry engineering, manufacturing, and inspection cost separate from production unit price. Whether any sample fee credits against a later production order is order-specific—state credit rules on the quotation, not as a site-wide guarantee.
Do not invent a fixed dollar sample fee or a fixed credit percentage here. Point buyers to Custom Cutting Tool RFQ with drawing, material, annual volume intent, and scrap-mode evidence; use Contact for commercial clarification.
Release-to-Production Sign-Off
A tool is released for production supply when all of the following are true under the agreed plan:
- Sample results meet the written acceptance list for that revision.
- Critical inspection data and part photos (where required) are archived against the tool revision.
- Buyer (or designated quality owner) signs off release—or the quotation defines an equivalent written acceptance path.
- Open deviations are either closed or explicitly deferred with owner and due condition.
Shipping a “looks good” first-off without sign-off is not release. Changing the print after release starts a new revision path.
Release is not the last email. After sign-off, first production pieces still need a named owner if the scrap mode comes back. HENTRY stays on that thread—drawing alignment, written acceptance, first-piece follow-up—without inventing a fixed calendar or a fixed fee on this page. Tool path when the sample is a reamer: How PCD Reamers Are Made.
The best ending is not a signed PDF sitting in a folder. It is a drawing we both read the same way, a written acceptance list, and someone still answering when the first production pieces tell a different story.
Frequently asked questions
How long does sample validation take?
Lead time depends on geometry, PCD tip work, inspection scope and machine-trial scheduling on the customer side. Confirm the date plan in the RFQ reply—do not assume a universal number.
Do I need a sample for every reorder?
No. After a revision is released, repeat supply follows that drawing. Re-sample when material, machine, holder or tolerance stack changes enough to invalidate prior evidence.
What if the trial fails?
Return measured data and tool/chip photos. HENTRY revises against the same acceptance table or recommends splitting the process (for example drill then ream) when combination duty is unstable.
Can HENTRY witness the trial?
Remote data review is standard. On-site support is discussed case by case when logistics and NDAs allow.
Which products use this process?
Commonly custom PCD reamers, solid carbide drills and combination drill-reamers—plus other drawing-based tools.
How many sample parts does HENTRY need?
It depends on the agreed band—functional, process, or release—and on what characteristics are in scope. Agree quantity and inspection plan in writing before trial; do not treat a website number as a fixed promise.
Can sample fees credit against production?
Only if the quotation says so for that order. Ask for credit rules in writing via RFQ or Contact.
What counts as release to production?
Written acceptance against the frozen tool revision, archived results, and buyer/quality sign-off (or the equivalent path defined on the quotation)—not an informal “looks OK.”
Ready to start validation?
Send the drawing, material and current machining conditions. We will propose the sample scope and acceptance table.
Start validation → RFQAlso: PCD reamer RFQ checklist · Drill RFQ checklist · Manufacturing & quality evidence