A Gun Drilling Machine produces accurate hole patterns and threads, where position accuracy and chip evacuation decide whether the part passes inspection. The Gun Drilling Machine described here is built with a BT30 spindle and 21-tool magazine and specified for tool and die shops. CNC drilling, rigid tapping and boring with peck cycles for chip control sits behind the numbers below, which are stated as delivered rather than as a best case.
The parts that matter most are the interfaces: bores, sealing faces, threads and mounting patterns. Those are held to hole position ±0.05 mm, verified against the drawing, and recorded before anything is packed.
Specification
| Process | Cnc drilling, rigid tapping and boring with peck cycles for chip control |
|---|---|
| Material / configuration | a BT30 spindle and 21-tool magazine |
| Size / capacity | drilling capacity to 40 mm in steel |
| Tolerance | hole position ±0.05 mm |
| Surface finish | drilled or reamed finish, H7 where specified |
| Application | gun drilling machine for tool and die shops |
| Inspection | Dimensional report, material certificate, first article report on request |
| Lead time | 7–15 working days for samples, 3–4 weeks for production |
| Minimum order | 1 piece for prototypes, from 50 pieces for production pricing |
Manufacturing process
The operation sequence is decided before the first chip is cut: roughing to leave even stock, semi-finishing, then CNC drilling, rigid tapping and boring with peck cycles for chip control as the final operation. That order is what keeps hole position ±0.05 mm stable as the batch runs and the machine warms up.
Material is purchased against a certificate and checked on receipt, so the composition is known before any cutting starts. Work in progress is identified by part number and operation, and the finished parts are deburred, cleaned and protected before they leave the machine area.
Typical applications
Most of the work supplied in this category falls into the following examples.
- Flange bolt circles.
- Manifold port drilling.
- Mould cooling channel drilling.
- Structural steel connection plates.
- Heat exchanger tube plates.
Quality control and documentation
Every batch is measured against the drawing with calibrated equipment, and results are recorded against the part number rather than kept on a scrap of paper.
Material certificates to EN 10204 3.1, dimensional reports and first article inspection reports are issued with the shipment where the application requires them. Calibration dates and measurement uncertainty are recorded alongside every result.
Ordering, lead time and packaging
Quotations are returned within one working day of a complete drawing package. Lead time is quoted from drawing approval, not from the date of enquiry.
Frequently asked questions
How accurate are drilled hole positions?
Position is normally held within 0.05 mm, and reaming or boring brings size to H7. Spotting the hole first and using a rigid setup matters more than spindle speed.
Can you drill deep holes without drifting?
Yes, with gun drilling and high pressure coolant. Depth to diameter ratios above 10:1 need guided tooling and controlled pecking rather than a standard twist drill.
Can you supply material and inspection certificates?
Yes. Material certificates to EN 10204 3.1, full dimensional reports, first article inspection reports and, where required, PPAP or AS9102 documentation are issued with the shipment.
To discuss gun drilling machine requirements, send the model and the drawing with the quantities required. Feedback on manufacturability is given free of charge before any order is placed.
