Deep Hole Drilling Machine

CNC Gundrilling

Combining the very best in technology and technical ability, our deep hole drilling department exceeds the needs of customers who have requirements for holes between 3mm diameter and 28mm diameter, to depths of up to 2500mm.

With an impressive selection of deep hole drilling machines at our disposal, we provide a highly cost-effective, rapid response solution to industries requiring the highest quality within the shortest possible time frame.

Minimum Bore Diameter 3mm 0.118″
Maximum Bore Diameter 28mm1.102″
Maximum O.A.L. 2000mm 78.740″
Bore Tolerance ± 0.05mm ± 0.002”
Surface Finish (Drilling Only) 1.6μ 63√
Accuracy (Drill Wander / T.I.R) 0.025mm per 25.4mm 0.001”per 1”drilled

Industries We Serve

CNC gundrilling is suitable for a range of materials, including high grade alloys, stainless steels, aluminium, titanium, and thermoplastics. Industries we work with include:

  • Injection Moulding
  • Aerospace
  • Medical technology
  • Hydraulics
  • Petrochemicals
  • Motorsport

Information/Parameters We Need To Quote For Deep CNC Gundrilling

  • The material specification – this is essential to ensure accurate quoting as material properties differ, as do the speeds and feeds required to machine them efficiently.
  • Outside dimensions – we need this to assess which machine the component can be held on as well as to ensure we have a suitable wall thickness to ensure the drilling process can be completed safely.
  • Inside diameter of the bores required – this is required to ensure we have tooling available, as although we have a vast range in stock, certain materials such as Inconel, may require specialist tooling, as do blind bores with specific forms at the base.
  • Overall length – as with the first two, these are required for tooling and machine capacity decisions and help us calculate the weight of the components.
  • The bore type – i.e., is it a through bore or blind bore? If it is a blind bore, is a specific form required such as a flat bottom or particular radius at the base? Standard deep hole drilling leaves a sharp W shape at the bottom of the bore. Any non-standard form can increase unit cost due to the requirement for specific drill grinding or bespoke tooling requirements.
  • Bore quantities and positional details – CNC gundrilling is most often utilised on parts which are not being drilled on centre, or holes, or multiples of holes, are required in fully machined blocks / milled sections. To quote accurately, we need the number of bores required, the position of them, and the positional tolerances required in relation to each other and the outside diameter.
  • The bore tolerance – bore tolerance is a major factor when quoting the CNC gundrilling process. If the tolerance is below the industry standard of ±0,1mm, a honing process may be required.
  • The depth tolerance – if you require a blind bore, we need to know the tolerance required on the bore depth. As long as there is excess material on the length and it is a round bar, we can “back-face” to achieve tighter tolerances on depths.
  • Any surface finish requirement – in addition to the bore tolerance, this is needed to ascertain whether we have to add a honing operation.
  • T.I.R. or Straightness requirements – we need to know these as even though we may be only carrying out an initial gundrilling or deep hole drilling operation, we need to ensure there is sufficient material to be machined down to correct any drill wander. Industry standard for drill wander is 1mm per 1 metre drilled.

To find out more about our CNC gundrilling services or to request a free, no-obligation quotation, please call us on 01525 370666 or send us a message.


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