Quality that connects industries. For over 45 years, Graf + Klett has been your reliable partner for deep-hole drilling of complex components. Whether (rotationally symmetrical) round parts or massive prismatic geometries such as blocks or plates – we process your workpieces with process reliability to the highest quality standards. With our modern machine park, we achieve drilling that meets the toughest demands for straightness, squareness, dimensional accuracy, and surface finish. If desired, with additional turning and milling operations in a single setup. Reliable and fast. We look forward to your enquiry and will provide you with a non-binding offer at short notice.
| Parameter | Performance data |
|---|---|
| Drill diameter | 1.0 mm to 100 mm |
| Max. drilling depth (both sides) | up to 5,000 mm |
| Materials | Steels, non-ferrous metals, plastics |
| Workpiece weight | up to 5.5 tonnes |
As per your requirements, we can machine almost any material with reliable processes:
Steels High-alloy tool steels and stainless steels (up to 43 HRC).
Non-ferrous metals Titanium, Inconel, Aluminium, Copper and Brass.
Plastics: High-quality technical plastics for special applications.
Depending on the requirements, we will select the optimal procedure.
Single-lip drilling
The highest precision for fine drilling from Ø 1 mm.
BTA process
Powerful machining for large diameters up to Ø 100 mm.
To get your components into production without time loss or transfer errors, we process your 3D models directly in our CAM systems. We support all common formats such as STEP and IGES. This guarantees you process-reliable CNC programming, even with the most complex geometries.
| Parameter | Performance data |
|---|---|
| Drill diameter | 1.0 mm to 100 mm |
| Max. drilling depth (both sides) | up to 5,000 mm |
| Materials | Steels, non-ferrous metals, plastics |
| Workpiece weight | up to 5.5 tonnes |
Even though the world is increasingly becoming three-dimensional, the 2D drawing is often still the legal basis for tolerances and surface specifications.
No waiting times for special tools.
No additional tooling costs for individual diameters.
3. Immediate implementation of your project.
Whether complex cast and welded constructions or mould inserts:
Thanks to the massive construction of our specialised CNC machines, we achieve maximum machine damping, which ensures vibration-free machining even at extreme drilling depths, and thus dimensionally accurate results.
This technical superiority allows us to deliver consistently high quality even for difficult tasks. We process your 3D data directly and reliably achieve even the most demanding drilling patterns in a single clamping operation.
For rotationally symmetrical components, we exploit the crucial advantage of workpiece rotation. By counter-rotating the drilling tool and the workpiece, we significantly minimise drilling run-out.
The result is a minimised deviation that guarantees compliance with your positional tolerances.
Machining prismatic workpieces requires the utmost flexibility in positioning. On our specialised CNC deep drilling and milling centres, we machine everything from small components to large parts:
Plates, blocks and mould inserts, as well as rotationally symmetrical workpieces with eccentric hole arrangement, precisely to your 3D data.
Typical workpieces: Calendar rollers, mould inserts and housings.
Deep hole drilling does not require pre-centring or pilot drilling. Threads should also be introduced after deep hole drilling (to avoid damage by the deep hole drilling tool). Below is a recommendation on how workpieces should be pre-processed for deep hole drilling. Apart from this pre-processing, the parts can Unprocessed to be.
Round material with a central deep hole is clamped in collets (= clamping cones) and therefore should bevelled on both sidesto be. A drill bush (not shown) is placed on the workpiece to guide the drill, therefore the round material should machined flat on both sides become.
The workpieces are clamped in prisms and therefore should have a cylindrically over-machined outer diameter as well as a Flanged tapping surface to provide for the insertion of a drill bush.
For tension in clamping bells (= clamping cones) the workpieces should be bevelled on both sides and Screwed up be. In addition, the Cylindrically bored outer diameter to enable a voltage in prisms.
Workpieces that are cuboid and plate-shaped should be used to attach a drill bushing (illustration) milled on all sides at right angles and otherwise unprocessed to be.
Let's talk about your requirements. Short distances, quick answers, real expertise.
