Spraymist
The
HA3000
spray mist units can be quickly fitted to most machine tools to give a deep
hole drilling capability; they are portable and require only to be connected
to the factory compressed air supply. The Ventec drilling system works in
the following way. A 3:1 air driven pump situated inside the spraymist unit
pressurises a 10% solution of a special emulsion oil; the oil 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 back along the drill flute and out of the hole.
The incoming air pressure should be 5,5–8,5 Bar (80-125psi). The coolant pressure should be set 3-5 Bar (45-75psi) 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 just 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.
We also offer a range of standard and custom built Coolant Fed Toolholders (click here for more info) and a service to design and retrofit SPRAYMIST transfer systems to most CNC Lathes and Machining Centres.