Frankor Deep Hole Drilling Machines
Frankor has specialized in manufacturing deep hole drilling machines for 25 years.
Deep hole drilling machines are use in a variety of different industries
Oil and Gas
Drill collars
Down hole tooling
casings
Refinishing spin casts for tubes
Aerospace
landing gear components
engine shafts and turbine parts
Nuclear
reactor components
generator shafts
Turbine rotor shafts
Hydraulics
Hydarulic Cylinders
Accumulators
What are deep hole drilling machines used for?
Deep hole drilling machines are specialized equipment used for very deep, precise and straight holes in large pieces of steel. they work by combining specialized drilling heads, high pressure coolant and precision guidance to to overcome the challenges of depth, chip evacuation and accuracy. They can generally bore larger holes holes at a faster rate than gun drilling.
What are the different functions of drilling machines
Deep Hole Drilling
This operation bores large, deep holes through large pieces of steel by using a hollow drilling tube and a pressure head. Coolant is pumped at high pressure around the outside of the drill tube, lubricating the cutting edges, breaking up the chips and then evacuating both the chips and coolant out through the hollow drill tube. Ideal for
Counter Boring
Counter boring is a secondary operation which can open up an existing hole hole and improve its finish and accuracy. it is also used to create steps within a bore and get rid of any tapers.
Pull Boring
This type of boring requires an existing hole wherein a boring tool is pulled through the piece and coolant flows through the tool and flushes the chips out the rear. This operation is used to improve the concentricity of a hole, make it straighter, improve the surface finish and give tighter tolerances.
Trepanning
Trepanning is preformed by using a hollow tube cutter with cutting inserts around the edge allowing a core to pass through. This type of deep hole drilling extracts a core instead of chipping valuable material and the core extracted may be repurposed. With this operation you get a large diameter hole with less energy, less time and less tool wear when compared to conventional drilling.
Honing
Honing is done with a mandrel fitted with abrasive honing stones which rotate and move in and out of a bore hole. this operation is used to finish the inside surface of a hole, achieving a high accuracy in size, straightness, roundness and creates a smooth cross-hatch pattern which is ideal for holding oil lubrication.