Short answer: a pneumatic rock drill performance report is useful only when every result is tied to a named tool configuration, controlled inlet pressure, defined air-flow reference condition, stated test method, identified instruments and repeatable operating state. A table that lists air consumption, blow frequency or rotation speed without those conditions is not comparable evidence and should not be used alone to approve a supplier or substitute model.
For procurement, require the original test record or a controlled summary—not an undated catalogue value copied into a quotation. ISO 2787:1984, which ISO confirmed as current in 2022, covers performance testing of rotary and percussive pneumatic tools, including measurement of power output and air consumption, adjustment to specified conditions, percussive-tool report formats and a procedure for impact energy. The standard is a framework for obtaining comparable data; it does not make every rock drill suitable for every hole, rock condition or compressor.
First decide what the report must prove
A laboratory performance report answers a narrower question than a field trial. It can show how one identified tool performed under controlled conditions. It cannot, by itself, prove penetration rate in the buyer’s mine because rock strength, abrasivity, jointing, drill-steel length, bit condition, feed, flushing, operator practice and air-line losses all affect the result.
Define the decision before requesting data:
- RFQ comparison: compare candidate models on the same measurement basis and inlet conditions.
- Sample approval: confirm that the delivered sample is consistent with the approved specification.
- Production audit: check whether a production batch remains within agreed limits.
- Failure investigation: determine whether an apparent performance problem comes from the tool, supply system or test setup.
- Compressor planning: obtain traceable air-demand data for a separate system-sizing calculation.
Do not combine these decisions into one vague requirement such as “provide test certificate.” State which characteristics are acceptance items, which are information only and which require a controlled field trial.
The minimum data block every report should contain
| Report section | Minimum information | Why the buyer needs it |
|---|---|---|
| Tool identity | Manufacturer, exact model, serial or sample ID, revision and production lot | Prevents a generic report being reused for a different configuration |
| Configuration | Shank size, drill steel or test fixture, rotation arrangement, muffler, lubricator and flushing state | Attachments and restrictions can change measured behavior |
| Supply conditions | Pressure measurement point, running pressure, temperature, moisture treatment and lubrication | Separates tool performance from air-system losses |
| Air-flow basis | Measured flow, unit, reference pressure and temperature, correction method and instrument | Makes air-consumption figures comparable |
| Performance outputs | Blow frequency, rotation speed and any agreed impact-energy or power result | Shows what was actually measured rather than inferred |
| Test control | Method or standard edition, load state, stabilization time, repeated runs and calculation rules | Allows another competent laboratory to reproduce the test |
| Traceability | Test date, laboratory, operator, instrument IDs, calibration status, raw readings and approvals | Connects the summary to auditable evidence |
Verify pressure at the correct point
Pressure is not a complete test condition unless the report states where and when it was measured. Compressor receiver pressure, manifold pressure and tool-inlet pressure can be different. For performance comparison, the buyer normally needs pressure at the agreed point while the drill is running, not a static gauge reading before the throttle opens.
Record the hose inside diameter, length, couplings, valves, filters and lubricator used between the regulated supply and the tool. Each restriction can contribute to pressure loss. A test made through an unusually short, oversized hose may be valid for the laboratory but still overstate what a site will obtain through its actual distribution network.
ISO 5941:1979 establishes preferred reference pressures for presenting pneumatic-equipment performance data. The buyer should still specify the model’s intended operating condition and the contract’s comparison point; the existence of a standard reference pressure does not authorize operating outside the manufacturer’s limits.
Do not accept an air-consumption number without its reference basis
Compressed-air flow changes with pressure and temperature. A value in m³/min, L/s or cfm is ambiguous if the report does not say whether it represents actual volume at the measurement point or volume corrected to stated reference conditions. Labels such as “free air” are also incomplete unless the reference state and correction method are identified.
For each air-use result, require:
- the flow unit and whether it is actual or referenced volume;
- the reference absolute pressure and temperature;
- the tool-inlet gauge pressure during the reading;
- the flow-meter type, range and valid calibration status;
- the location of pressure and temperature sensors;
- the correction formula or software method;
- whether total flow includes flushing or a separate air circuit;
- the average, variation and number of repeated runs.
Never convert one supplier’s cfm figure to L/s and assume the data are now comparable. Unit conversion does not correct different reference conditions, pressure points or included air circuits.
Separate measured performance from calculated claims
Blow frequency can be reported in blows per minute or hertz; rotation speed is normally reported in revolutions per minute. These values should be measured under a defined operating state. Ask whether the drill was free-running, working against a standardized absorber or drilling a specified material. Results from different states should not be placed in one comparison column.
Impact energy is particularly easy to misinterpret. The report should state whether it was measured by the procedure in the selected method, calculated from piston data or inferred from another value. If a supplier gives percussion power, require the formula and the underlying impact-energy and frequency readings. Calculated results are not invalid, but they must be clearly distinguished from direct measurements and supported by the input data.
Do not rank drills by a single highest number. More blows do not automatically mean more useful work at the bit, and a higher theoretical impact value does not guarantee faster site penetration. Energy transfer through the chuck, shank and drill steel, bit diameter, feed and flushing remain part of the drilling system.
Control the tool configuration before testing
The same model name can cover revisions, suffixes or market-specific configurations. Before testing, photograph the nameplate and record the complete model code. Confirm the installed chuck or bushing, shank family, rotation parts, exhaust arrangement, muffler, throttle components, water tube or flushing fittings and air-leg connection where applicable.
Tool condition must also be controlled. A newly assembled drill packed with preservative, an unlubricated sample and a worn field unit cannot be compared as if they were equivalent. Record pre-test inspection, run-in procedure, lubricant grade and delivery method. If components are replaced or settings changed during the test, start a new run identity rather than averaging before-and-after data.
Use the pneumatic rock drill anatomy guide to align component terminology with suppliers before the test plan is issued.
Require repeatability, not one favorable run
A single reading cannot show stability. The report should define how the system was stabilized, how long each reading covered, how many runs were made and how the reported result was calculated. Ask for individual readings as well as averages. Large variation can indicate an unstable air supply, inconsistent lubrication, instrument placement problems or a tool fault.
Agree acceptance rules before the sample arrives. The purchase specification should state:
- the test method and edition;
- the exact configuration and pressure condition;
- required characteristics and units;
- nominal values, tolerances or approved comparison sample;
- number of samples and repeated runs;
- how outliers and instrument uncertainty are handled;
- the retest rule after a failed run;
- who may witness or approve the test;
- the documents and raw data delivered with the shipment.
Do not create a tolerance after seeing the result. A supplier catalogue range, a purchase acceptance limit and a field performance target are different controls.
Check calibration and traceability without asking for decorative paperwork
A calibration certificate is relevant only when it matches the instrument ID used in the report and was valid on the test date. Check that the instrument range and resolution suit the measured quantity. The report should identify pressure gauges or transducers, flow meters, tachometers, frequency sensors and any impact-measurement equipment.
For critical purchases, request a traceability chain:
- purchase order and controlled specification;
- sample or production-unit identity;
- test plan and standard edition;
- instrument list and calibration status;
- raw readings and corrections;
- signed result summary and disposition;
- link from the approved report to the shipped lot.
A generic ISO 9001 certificate does not replace product-level performance evidence. Likewise, an ISO 2787 reference on a brochure is not proof that the reported unit was tested to that method.
Keep performance testing separate from safety and field validation
Performance testing does not replace machine safety requirements. ISO 11148-5:2011 addresses safety requirements for hand-held rotary percussive drills, including pneumatic rock drills. The test bench and operating procedure must also follow applicable local law, guarding, hose restraint, noise, vibration and authorized-person rules.
Test arrangements can change performance. A U.S. Bureau of Mines/NIOSH test report on a pneumatic rotary drill reported that added exhaust back pressure reduced pneumatic flow, rotation speed and penetration rate. That example does not establish a universal limit, but it shows why the exhaust configuration and any muffler or hose must be recorded rather than treated as invisible accessories.
After laboratory acceptance, use a controlled field trial for the actual application. Keep the same drill steel, bit type, hole diameter, rock zone, supply arrangement and operator procedure as far as practical, and compare more than one hole. Field data should supplement the laboratory report, not rewrite it.
Buyer acceptance gate for a supplier performance report
A report can be technically detailed and still be unusable for an RFQ, sample approval or production-lot decision. Before comparing a supplier’s numbers with another report, review the evidence as one controlled package. A missing condition is not automatically a product failure, but it is a reason to stop the comparison until the gap is closed.
| Review gate | Evidence required | Hold or reject trigger |
|---|---|---|
| Report identity | Supplier, report number, issue date, method and edition, responsible approval | Undated document, uncontrolled revision or no link to the quotation or purchase specification |
| Tested unit | Exact model and suffix, serial or sample ID, lot, shank and installed configuration | Generic family data, another configuration or identity that cannot be tied to the offered unit |
| Controlled inlet condition | Running pressure, measurement point, hose and accessory path, lubrication and load state | Static compressor pressure, unknown measurement point or different operating states between reports |
| Air-flow basis | Measured unit, included circuits, reference pressure and temperature, correction method and instrument | Flow value without a reference state, or unit conversion used to conceal a different measurement basis |
| Performance outputs | Raw and reported blow, rotation, air-use and agreed impact or power results with calculation basis | Catalogue values substituted for readings, or calculated claims without their inputs |
| Repeatability and uncertainty | Individual runs, stabilization rule, variation, uncertainty treatment and any retest reason | Only one favorable run, unstable results or a retest that overwrites the failed record |
| Instrument traceability | Instrument IDs, ranges and calibration status valid on the test date | Certificate IDs do not match the instruments, dates or measured range |
| Contract acceptance link | Agreed limits, approved comparison sample, exceptions and authorized disposition | Limits created after results are known, or no rule connecting data to the buying decision |
Choose one report disposition
- APPROVE AS COMPARABLE: identity, configuration, conditions, method, repeated readings, calibration and contract limits are complete and aligned with the comparison set. The report may support the stated procurement decision; field performance still requires its own validation where specified.
- CONDITIONAL USE: the report is suitable for a limited information purpose, but a named characteristic remains outside the agreed comparison basis. Record the restriction and do not reuse the report for lot acceptance or fleet substitution.
- HOLD FOR CLARIFICATION: required evidence is missing, ambiguous or inconsistent, but the gap may be closed with raw data, a corrected controlled report or a witnessed retest. Do not rank the supplier while the report is on hold.
- REJECT AS NON-COMPARABLE: the tested unit or configuration differs materially, the method cannot be reconstructed, critical results are unsupported, or the supplier will not preserve failed or superseded evidence.
Copy-ready procurement review record
Record the purchase or RFQ reference; supplier and report ID; model, suffix, sample and lot; method and edition; complete setup and operating state; running pressure and measurement point; airflow reference basis; individual readings and calculations; repeatability and uncertainty; instrument and calibration IDs; contractual limits; exceptions; final disposition; reviewer; and date. Attach clarification responses and superseded reports rather than replacing them, so the approval trail remains auditable.
Use the acceptance gate before comparing models in the Rock Drills collection. For a model-specific quotation, review the active YT28 air-leg rock drill and submit the controlled evidence requirement through the request-a-quote form.
Post-overhaul acceptance: release the repaired drill by evidence
A repaired or overhauled pneumatic rock drill should not return to production merely because it starts, sounds normal or passes air on a workshop floor. The release decision belongs in this performance-test report because the buyer or maintenance supervisor must connect the as-left configuration, controlled test conditions, repeated results and unresolved observations to one disposition.
Scope boundary: the exact run-in sequence, permitted pressure, fixture, test duration, torque or impact method, wear limits and fastener requirements must come from the manual or controlled repair specification for the exact model and revision. Do not transfer bench values from another drill family. The checklist below controls evidence and release logic; it does not invent universal acceptance limits.
| Acceptance stage | Evidence to record | Release question |
|---|---|---|
| Unit and work-order identity | Complete model and suffix, serial or shop ID, incoming symptom, work-order number, repair date and technician | Can every result be tied to this repaired unit and this repair event? |
| As-left configuration | Chuck or bushing, retainer, rotation parts, valve and piston configuration, muffler, flushing components and air-leg connection where fitted | Does the tested assembly match the configuration that will return to service? |
| Repair traceability | Parts replaced, approved part or drawing references, measured clearances or condition checks, assembly procedure and required fastener records | Are critical repair decisions supported by the model-specific instruction rather than memory? |
| Pre-pressure inspection | External condition, control movement, steel retention, capped or connected ports, guard and fixture readiness, hose/coupling/restraint condition and isolation controls | Is the unit ready for an authorized guarded test without an obvious assembly or connection defect? |
| Controlled run-in | Manual reference, inlet pressure at the stated point, duration or cycle, lubricant and delivery method, fixture/load state, temperature and unusual sound or leakage observations | Did the unit stabilize without abnormal heating, binding, leakage or irregular operation? |
| Performance test | Running inlet pressure, air-flow basis, impact or blow-rate result, rotation result, air-leg/feed function and flushing function where applicable, with instrument IDs | Were all characteristics required by the repair specification tested under the defined state? |
| Repeatability | Individual runs, stabilization rule, variation, retest reason and result after any correction | Is the result repeatable, or does one favorable run hide intermittent behavior? |
| Final condition | Post-test leaks, fastener or joint condition, temperature observations, steel/chuck/retainer condition, cleanliness, preservation and fitted accessories | Did the test itself reveal movement, heat, damage or another unresolved condition? |
Copy-ready post-repair test record
Attach this minimum record to the work order or supplier repair report:
- Unit: model, suffix/revision, serial or shop ID, owner and work-order reference.
- Incoming condition: reported symptom and confirmed fault, stated separately.
- Work completed: inspection, parts replaced, measurements, adjustments and unresolved observations.
- Controlled documents: exact manual, repair instruction, drawing and acceptance specification revisions used.
- Test setup: fixture or steel, hose and fittings, lubricator, flushing state, air-leg configuration, exhaust/muffler and guarding.
- Measured conditions: running pressure and measurement point, flow reference basis, lubricant, temperature and instrument IDs/calibration status.
- Results: each required run, impact/blow, rotation, air use, leakage, feed and flushing observations as applicable.
- Disposition: release, hold for evidence, or return for corrective work; approver, date and any operating restrictions.
Use a three-way disposition gate
- RELEASE TO CONTROLLED SERVICE: identity and configuration are verified; required repair records are complete; every agreed test passed under documented conditions; repeated runs are stable; and final inspection found no unresolved abnormal condition. Site commissioning and normal pre-use checks still apply.
- HOLD—EVIDENCE INCOMPLETE: the drill may appear to operate, but a required identity, manual reference, measurement, calibration link, repeated run or final inspection record is missing. Preserve the as-tested state and close the evidence gap before release.
- RETURN FOR CORRECTIVE WORK: a required result failed, an abnormal leak/heat/noise/binding condition remains, configuration is wrong, or the unit changes state between runs. Isolate it, document the failed state and create a new test identity after correction; do not overwrite the failed record.
Listening and touch can support a competent technician’s observations, but they are not substitutes for specified measurements or safe test controls. If the repair facility cannot perform a required load or performance test, the report should say so and identify the remaining controlled commissioning step instead of marking the unit fully accepted.
Red flags that should place the report on hold
- No serial number, sample ID or model suffix.
- Pressure stated without measurement location or running condition.
- Air consumption stated without reference pressure and temperature.
- Mixed actual-volume and free-air units in one table.
- Impact energy or power shown without method or calculation basis.
- Blow frequency and rotation speed copied from a catalogue rather than test readings.
- Only one run, with no raw data or variation.
- Instrument certificates that do not match report IDs or dates.
- Test photos showing a different tool or configuration.
- Report date earlier than the identified production sample.
- A standard reference with no edition or applicable clause.
- A field penetration claim with no rock, bit, feed or flushing conditions.
RFQ clause buyers can adapt
Ask the supplier to submit a performance report for the exact offered pneumatic rock drill model and configuration. Require the test method and edition, unit identity, inlet-pressure measurement point, running pressure, air-flow reference conditions, hose and accessory configuration, lubricant, load state, instruments and calibration status, repeated raw readings, calculated values and responsible approval. State that unconditioned catalogue values are for information only and that final acceptance remains subject to the agreed sample and field-validation plan.
Frequently asked questions
Is an ISO 2787 statement enough to accept a rock drill?
No. It should be supported by the exact tool identity, test conditions, measurements, instrument traceability and acceptance criteria. The standard reference explains the method; it does not identify the tested production unit by itself.
Can two air-consumption values be compared after unit conversion?
Only if their reference conditions, included circuits, tool-inlet pressure, operating state and correction method are equivalent. Converting cfm to L/s does not resolve a different pressure or temperature basis.
Should pressure be measured at the compressor or the tool?
For tool performance, require the agreed pressure at the specified measurement point while the drill is operating. Compressor discharge pressure alone cannot show losses through the receiver, pipework, hose, couplings and accessories.
Does higher blow frequency prove faster drilling?
No. It is one performance characteristic. Useful penetration also depends on energy per blow, transfer through the drill string, rotation, feed, bit and rock, plus effective cuttings removal.
When is a field trial still required?
Use a field trial when the purchasing decision depends on penetration, hole quality, consumable life, operator handling or performance in a specific geology. A controlled laboratory report cannot reproduce every site variable.
Make supplier performance data comparable before awarding the order
A credible report lets the buyer trace each number back to a unit, condition, instrument and calculation. Define that evidence in the RFQ, approve the test plan before work begins and keep laboratory results separate from field-productivity claims.
Review the active YT28 air-leg pneumatic rock drill and related PerfoMax rock-drill models, or send the model, target hole range, working pressure, compressor data and required acceptance evidence through the request-a-quote form. PerfoMax can help structure a model-specific data sheet and sample-verification checklist without treating catalogue values as a substitute for site validation.