Drill Units
The concentric construction of GOVRO machining units combines air thrust, hydraulic control and positive stop ALL on the spindle centerline. Concentric design minimizes quill deflection, affords longer life of the unit, tools and bushings and assures uniformly accurate parts. The closed hydraulic system, always under pressure, prevents chips and coolant from entering the system, in addition, it automatically adjusts for oil weepage to lubricate seals for longer life. The hydraulic positive feed control has no axial backlash, minimizing “drill dive” at break-through, which may occur with a mechanical feed system.
Model 300 Series
Govro Model 300 Series machining units are available in six standard types depending opon machining operations required and are made for relatively small operations, up to 5/16th” drill in mild steel. Units come standard with a #2 Jacobs taper spindle (.001” TIR). Spindle adapters are available for most tooling configurations, as well as a slotted spindle adapter and quill flange for use with multiple spindle heads. The spindle has an electric motor drive and aluminum motor mount bracket with versatile motor positioning.
- Concentric Features: thrust, retract, hydraulic feed, deceleration (rapid to feed),
positive depth stop (optional). - Adjustable feed control, stroke control, positive stop and rapid approach.
- No axial backlash.
- Closed circuit hydraulic system
- Always under pressure
- Prevents chips and coolant from entering system
- Lubricates seals for longer life
- Rugged one-piece cast iron housing (for dimensional stability)
- Quill supported front and rear.
- Mounts in any position.
- Electric motor spindle drive.
Models 300, 33 & 46
Shown here with our Model 300 the Models 33 and 46 can drill up to ½” and ¾” in mild steel respectively. Also designed with GOVRO’s unique concentric construction – combining air thrust, hydraulic control and positive stop all on the spindle centerline.
Model 300
The Model 300 Series have GOVRO’s unique concentric design with all forces along the spindle centerline. Capable of drilling up to 5/16″ in mild steel these compact units may be mounted in parallel on 5″ centerlines or radially on 30-degree centerlines.
There are six different models of the 300 to choose from:
- Model 300 automatic drilling units are designed for centering, drilling, reaming, facing, chamfering, counterboring, hollow-milling, spinning and form tool work.
- Model 300-DT automatic drill and/or tap units are similar to the standard drilling unit but with adjustable retract feed control. Retract feed control permits DT units to be used to tap only as well as to drill and tap through holes in one operation by use of combination tools with tension tool holders. Retract feed control can also be used with recessing tools to do I.D. and O.D. grooves, back chamfers, back spot faces, etc.
- Model 300-P automatic peck feed units are for deep hole drilling. An adjustable peck feed removes chips and allows cutting fluid to enter the hole. Each peck stroke is infinitely adjustable by use of a timer in the control circuit and by varying the feed rate. After each peck, the quill quickly retracts to the full back position. Then it rapid approaches to within .020″ of previous stroke depth before going into feed. When final depth is reached, the quill retracts and rapid approach automatically resets for the next part.
- Model 300-T automatic tapping units are designed for tapping, pipe tapping, threading and pipe threading using solid or self-opening tooling. Balanced air or separate pneumatic thrust and retract controls are used. Reversing is by motor reversal for very accurate depth on blind holes or taper pipe threads. Motors with high reversal capacity are available as well as standard motors with A/C variable frequency drives.
- Model 300-SF automatic skip-feed units are similar to the standard drilling unit but with skip feed for rapid travel across an opening in a part.
- Model 300-DF automatic dual-feed units are similar to the standard drilling unit but with dual feed capabilities. Dual feed is typically used on difficult angular holes where a slow feed rate is needed during drill entry before returning to normal feed rate for the rest of the hole.
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MODEL 300 SPECIFICATIONS
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Range. . . Stroke. . . Feed. . . Rapid Advance. . . Rapid Retract. . . Thrust Area. . . Feed Control. . . Motor Capacity. . . |
. . . . .#80 to 5/16″ in Mild Steel . . . . .up to 3″ Maximum . . . . .up to Full Stroke . . . . .0″ or 3/8″ Minimum . . . . .up to Full Stroke . . . . .Advance, 3 square inches . . . . .Retract, 1-1/2 square inches . . . . .Metered Centerline Hydraulic . . . . .Belt Drive . . . . .1/2″ dia. Spline . . . . .Solenoid Air Valve . . . . .Positive Stop Dwell, .0005 . . . . .Without Dwell, .005 . . . . .1 HP . . . . .1″ . . . . .65 lbs |
Model 33 and Model 46 Series
Govro Model 33 Series machining units are made for operations up to ½” drill in mild steel and Model 46 Series for operations up to ¾” in mild steel. Spindles are available for most tooling configurations as well as slotted spindle and quill flange for use with multiple spindle heads. The spindle has an electric motor drive. Units are controlled with commercially available valves and limit switches. Operation is simple and quiet, while unit construction is rugged and durable.
- Concentric Features: thrust, retract, hydraulic feed, deceleration (rapid to feed), positive depth stop.
- Adjustable feed control, stroke control, positive stop and rapid approach.
- No axial backlash.
- Closed circuit hydraulic system
- Always under pressure
- Prevents chips and coolant from entering system
- Lubricates seals for longer life
- Rugged one-piece cast iron housing (for dimensional stability)
- Quill supported front and rear.
- Mount in any position
- Electric motor spindle drive
There are seven different models of the 33 & 46 to choose from:
- Model 33 & 46 automatic drilling units are designed for centering, drilling, reaming, facing, chamfering, counterboring, hollow-milling, spinning and form tool work. They have adjustable rapid approach, feed rate, depth control and rapid retract.
- Model 33-T & 46-T automatic drill and/or tap units are similar to the standard drilling unit but with adjustable retract feed control. Retract feed control permits DT units to be used to tap only as well as to drill and tap through holes in one operation using combination tools with tension tool holders. Retract feed control can also be used with recessing tools to do I.D. and O.D. grooves, hose barbs, back chamfers, back spot faces, etc. One customer used DT units to automatically drive studs.
- Model 33-P & 46-P automatic peck feed units are for deep hole drilling. An adjustable peck feed removes chips and allows cutting fluid to enter the hole. Each peck stroke is infinitely adjustable by use of a timer in the control circuit and by varying the feed rate. After each peck, the quill quickly retracts to the full back position. Then it rapid approaches to within .020″ of previous stroke depth before going into feed. When final depth is reached, the quill retracts and rapid approach automatically resets for the next part.
- Model 33-T & 46-T automatic tapping units are designed for tapping, pipe tapping, threading and pipe threading using solid or self-opening tooling. Balanced air or separate pneumatic thrust and retract controls are used. Reversing is by motor reversal for very accurate depth on blind holes or taper pipe threads. Motors with high reversal capacity are available as well as standard motors with A/C variable frequency drives. A lead screw attachment is available if desired.
- Model 33-SF & 46-SF automatic skip-feed units are similar to the standard drilling unit but with skip feed for rapid travel across an opening in a part.
- Model 33-DF & 46-DF automatic dual-feed units are similar to the standard drilling unit but with dual feed capabilities. Dual feed is typically used on difficult angular holes where a slow feed rate is needed during drill entry before returning to normal feed rate for the rest of the hole.
- Model 33-LS & 46-LS automatic lead screw tapping units. Perform same operations as Models 33-T and 46-T. Designed with rapid approach and retract. Leadscrew assembly is easily accessible to change pitch quickly.
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MODEL 33 SPECIFICATIONS
Range to 1/2″ in Mild Steel |
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| Stroke. . . . . . Feed. . . . . . Rapid Advance. . . . . . Rapid Retract. . . . . . Thrust Area. . . . . . . . . . . . Feed Control. . . . . . Spindle Speed. . . . . . Spindle Drive. . . . . . Cycle Control. . . . . . Depth Control. . . . . . . . . . . . Motor Capacity. . . . . . Unit Drive Shaft Dia.. . . . . . Approx. Wt. with Motor. . . |
up to 3″ Maximum up to Full Stroke 0″ or 3/8″ Minimum up to Full Stroke Advance, 5 square inches Retract, 2.15 square inches Metered Centerline Hydraulic Belt Drive 5/8″ dia. Spline Solenoid Air Valve Positive Stop Dwell, .0005 Without Dwell, .005 1-1/2 HP 3/4″ 175 lbs. |
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MODEL 46 SPECIFICATIONS
Range to 3/4″ in Mild Steel |
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| Stroke. . . . . . Feed. . . . . . Rapid Advance. . . . . . Rapid Retract. . . . . . Thrust Area. . . . . . . . . . . . Feed Control. . . . . . Spindle Speed. . . . . . Spindle Drive. . . . . . Cycle Control. . . . . . Depth Control. . . . . . . . . . . . Motor Capacity. . . . . . Unit Drive Shaft Dia.. . . . . . Approx. Wt. with Motor. . . . |
up to 6″ Maximum up to Full Stroke 0″ or 3/8″ Minimum up to Full Stroke Advance, 10 square inches Retract, 3.62 square inches Metered Centerline Hydraulic Belt Drive 7/8″ dia. Spline Solenoid Air Valve Positive Stop Dwell, .0005 Without Dwell, .005 3 HP 7/8″ 250 lbs. |