An air-leg rock drill quotation can look complete while still omitting the parts that make the system usable underground. A machine alone is not a drilling package. The buyer must freeze the rock drill model, compatible air leg, delivered air, hose and coupling path, lubrication, water flushing, drill steel, bits, service parts and acceptance evidence as one connected system.
The fastest way to prevent a mismatched order is to build the request from the working interface outward. Start with the hole and rock, select the drill and drill steel system, then size the air, water and support equipment around the controlled model requirement. Do not select a compressor from motor power or a hose from outside diameter alone.
Complete-package map
| Package block | Buyer must define | Common omission | Result if omitted |
|---|---|---|---|
| Application | Rock, hole diameter/depth, angle, shift pattern, site altitude | Only “underground mining” | Wrong machine or unrealistic output expectation |
| Rock drill | Exact model, revision, shank, operating pressure basis | Family name only | Compatibility and air demand remain uncertain |
| Air leg | Model/suffix, mounting interface, extension and thrust range | “One air leg” | Leg may attach but not provide the required geometry |
| Air system | Compressor FAD, simultaneous users, header, hose ID/length, couplings | Compressor kW only | Low tool-inlet pressure and weak drilling |
| Lubrication | Approved oil, line oiler, placement and refill method | Oiler not included | Rapid wear, heat or poor impact |
| Water system | Source, hose, fitting, pressure/flow basis and dust-control method | Water hose treated as generic | Weak flushing, leakage or unsafe dust control |
| Drill string | Shank, steel cross-section/length, taper/thread and bit | Bit diameter only | Parts may not mate or transmit energy correctly |
| Spares and tools | Controlled parts list, quantities, service tools and records | Generic seal kit | Wrong revision or unusable spares |
| Acceptance | Packing list, identity photos, inspection record and field baseline | Visual check only | Disputes start after commissioning |
Step 1: define the drilling duty
Record the rock condition, target hole diameter, normal and maximum hole depth, hole angle, available working space, expected holes per shift and number of drills operating at the same time. State whether the work is development heading, stoping, secondary breaking, quarry work or another defined duty.
This information decides whether an air-leg drill is the correct category. A hand-held drill may be easier to position for lighter work; an air-leg unit provides supported feed for production drilling. Use the hand-held versus air-leg guide and the Air-Leg Rock Drill selection guide before freezing a model family.
Step 2: lock the machine and air-leg identity
The purchase record should contain the exact drill model, nameplate or controlled catalogue reference, shank interface, stated air consumption at its stated pressure, water connection and compatible air-leg model or suffix. A shared mounting style or similar appearance is not proof of compatibility.
For YT-series equipment, do not assume every FT160 suffix fits every drill. Use the FT160 compatibility guide and request the exact combination in writing. When model identity is uncertain, use the YT24/YT27/YT28/YT29A identification guide before ordering spares or attachments.
Step 3: specify delivered air, not a compressor label
List every simultaneous air user. Add each controlled airflow requirement at the required pressure, then account for site conditions and distribution losses using the compressor supplier's delivered-air data. Receiver volume can buffer short changes, but it does not replace sustained FAD.
The package record must show main-line ID, branch ID, hose length, coupling minimum bore, isolation points and tool-inlet pressure verification. Use the YT28 compressor sizing guide, the mixed-fleet sizing guide and the air-hose sizing guide for the calculation inputs. Do not add nominal tool consumptions without checking that they use compatible reference conditions.
Step 4: include lubrication, moisture control and safe connections
Specify the approved rock-drill oil from the model documentation, the line oiler capacity and location, filters or separators required by the site, and the method for checking oil delivery. The oiler must be installed in the correct flow direction and within the manufacturer's permitted arrangement.
Every compressed-air hose and coupling must be pressure-rated and suitable for the service. Include positive locking and hose-restraint requirements based on the site procedure and applicable rules. Use the lubrication guide and hose-restraint checklist as separate acceptance references.
Step 5: freeze the water-flushing path
Record water source, hose ID and length, fitting/interface, expected pressure and flow at the tool, filtration and the site's dust-control requirement. Water must reach the correct inlet through compatible hardware; more pressure is not automatically better.
If the site has variable supply, define how flow will be verified during drilling. For model-specific symptoms, consult the YT28 water-flushing guide. Dry drilling should never be chosen only because a water hose is missing; follow the site's exposure-control plan and applicable requirements.
Step 6: match drill steel and bit as one interface chain
For tapered systems, freeze chuck/shank size, steel cross-section, shank length, steel length, taper angle, bit socket and bit diameter. For threaded systems, freeze the complete thread and rod architecture instead of using a broad name such as “R32 rod.”
The package should state whether the bit is button, cross or chisel, the intended rock condition, flushing-hole arrangement and acceptance dimensions. Use the H22×108 compatibility guide, taper-angle compatibility guide and H22 bit selection guide where relevant.
Step 7: define spares without guessing part numbers
A useful spare package starts from the exact model revision and controlled parts list. Ask for part number, description, quantity per machine, recommended site stock, interchangeability note and drawing or photo where identification is difficult. Do not accept a generic bag labelled “repair kit” as proof that it fits the machine.
If a controlled exploded view or model-level parts list is unavailable, list the missing evidence and keep the item pending. Record service tools, consumables and inspection instruments separately from replacement parts.
Step 8: accept the package in two stages
Factory-stage evidence should confirm identity, quantity, visible condition, interfaces, packing and required documents. Site commissioning should confirm correct assembly, lubrication, air/water connections, dynamic pressure and stable operation under a representative drilling condition.
Keep the first accepted readings as the maintenance baseline: tool-inlet pressure under load, oil delivery, water behavior, impact/rotation behavior, temperature trend and drilling result in a described rock condition. Output alone is not a fair acceptance metric unless the hole, rock and setup are controlled.
RFQ input block
Send the application, hole range, drill model candidates, simultaneous quantity, site altitude, compressor FAD curve, hose layout, air-leg requirement, water arrangement, drill-steel and bit interfaces, spare philosophy, documents, destination and required delivery batch. Review the Pneumatic Rock Drills collection, then request a package quotation.
FAQ
Is a rock drill, air leg and hose enough for a complete package?
Usually not. The working system also needs verified air delivery, lubrication, water flushing, compatible drill steel and bits, safe couplings/restraints, service items and acceptance records.
Can I select the compressor from the rock drill's rated air consumption?
The rating is only a starting input. Use the stated pressure basis, number of simultaneous users, site conditions, distribution losses and the compressor's delivered-air curve.
Should spare parts be ordered before the exact machine revision is confirmed?
No. Similar model names can contain revision or interface differences. Freeze the exact identity and controlled parts reference first.