Ventec Drills

The problems of twist drilling deep holes are well known to the engineering industry. Drill wander, poor size control and surface finish, flank wear, binding and breakage are occupational hazards. The operation can be slow and inaccurate in the extreme.

An alternative is the use of Ventec drills which are designed to bring the benefits of gun drilling technology into a toolroom environment. Now, for a relatively small outlay, it is possible to equip your machine shop with a system that provides a deep hole drilling capability, which in terms of speed and accuracy, equates favourably with gun drilling.

In operation the tool must be supported in a short pilot hole before drilling commences. Thereafter, penetration is continuous, and depth to diameter ratios exceeding 60:1 with a  single tool are achievable. The cutting forces created by the offset tip geometry act upon the carbide bearing pads,  achieving fine surface finish and size control. It is this accuracy of dimensional control which is responsible for the excellent concentricity achieved by Ventec drills. It has literally nowhere to go but forward.

Deep Hole Drilling Accessories

​The HA3000 Spraymist units can be quickly fitted to toolroom machine tools to give a deep hole drilling capability; they are portable and require only to be connected to a compressed air supply. The Ventec drilling system using a Spraymist unit works in the following way. A 3:1 air driven pump situated inside the Spraymist unit pressurises a 10% solution of Ventec cutting oil and water. This fluid is atomised by the compressed air at an adjustable sprayjet head and delivers the resulting mist mixture into the toolholder and through the Ventec drill. At the cutting face the mist mixture expands as it exits the hole in the carbide tip producing a refrigerating effect. The heat from the cutting process evaporates the water content of the mist, leaving high lubricity oil to lubricate the burnishing pads of the cutting tip. The compressed air ejects the chips via the Ventec drill flute. The incoming air pressure should be from 5 to 9 bar (75-130 psi). The coolant pressure should be set 3-5 Bar (45-75 psi) above this pressure. The mist flow should be adjusted until a light mist is visible at the commencement of drilling. During the drilling cycle a trickle of fluid should be noticeable returning along the drill shank and slightly wetting the face of the workpiece. To achieve optimum results the Ventec cutting oil mixing instructions must be followed exactly.

Rotating tool holders, with straight or morse taper shanks, are available for use with milling and boring machine tools. Stationary tool holders are available for use with machines that rotate the work piece. ​

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Gun drill and Ventec accessories are all available directly from stock and can usually be despatched within 48 hours.

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