Drilling machine

A drilling machine comprising,

• a base,
• a pair of support ways supported from the base,
• a workpiece holding chuck having an axis positioned in the middle of the support ways,
• a drill tool support slidably supported from the ways for longitudinal movement along the ways, the drill support including a drill spindle positioned in the middle of the support ways for holding a drill tool,
• a hydraulic piston and cylinder assembly connected to the tool support on each side of the drill spindle moving the tool support along the ways,
• said drill spindle and hydraulic piston and cylinder assemblies positioned in the same plane with the ways providing only an axial drilling force on the drill spindle thereby allowing a drill in the spindle to drill a straight hole in a workpiece held in the holding chuck,
• means applying fluid to the piston and cylinder assemblies, said means including,
• a lead screw,
• a motor connected to and driving the lead screw,
• a valve controlling the application of fluid to the piston and cylinder assemblies, said valve connected to and actuated by the lead screw,
• means stopping the application of fluid if the pressure of the fluid reaches a predetermined value, said means including,
• a pressure switch connected to the piston and cylinder assemblies and actuated when the pressure applied to the assemblies reaches a predetermined value and limiting the actuation of the motor.

A drilling machine comprising,

• a base,
• a pair of support ways supported from the base,
• a workpiece holding chuck having an axis positioned in the middle of the support ways,
• a drill tool support slidably supported from the ways for longitudinal movement along the ways, the drill support including a drill spindle positioned in the middle of the support ways for holding a drill tool,
• a hydraulic piston and cylinder assembly connected to the tool support on each side of the drill spindle moving the tool support along the ways, said piston and cylinder assemblies include a double acting piston,
• said drill spindle and hydraulic piston and cylinder assemblies positioned in the same plane with the ways providing only an axial drilling force on the drill spindle thereby allowing a drill in the spindle to drill a straight hole in a workpiece held in the holding chuck,
• means applying fluid to the piston and cylinder assemblies, said means including means applying fluid to either side of the piston and further including,
• a lead screw,
• a reversible motor connected to and driving the lead screw,
• a valve controlling the application of fluid to both sides of said pistons, said valve connected to and actuated by the lead screw.

A drilling machine comprising,

• a base,
• a pair of horizontal support ways supported from the base,
• a workpiece holding chuck having a horizontal axis positioned in the middle of the support ways,
• a drill tool support slidably supported from the ways for horizontal movement along the ways, the drill support including a drill spindle having an axis positioned in the middle of the support ways for holding a drill tool,
• a horizontal double acting hydraulic piston and cylinder assembly connected to the tool support on each side of the drill spindle for moving the tool support along the ways,
• said drill spindle and said assemblies positioned in the same plane with the ways for providing only an axial drilling force on the drill spindle thereby allowing a drill in the spindle to drill a straight hole in a workpiece held in the holding chuck,
• a lead screw,
• a reversible motor connected to and driving the lead screw,
• a valve controlling the application of fluid to both sides of said pistons, said valve connected to and actuated by the lead screw,
• means connected to the piston and cylinder assemblies monitoring the drilling pressure applied to the assemblies.