Nobur JA Recessing Head
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Nobur ® JA Series AUTOMATIC RECESSING DEEP HOLE Nobur ® JA Recessing Head For deep bore recessing and grooving. A tool for use on: ■ Drill presses ■ Jig boring machines ■ Milling machines ■ CNC machines ■ Tool or turret lathes ■ Horizontal boring machines ■ Special purpose machines Features: ■ In-bore pilot supports cutter along its entire length – eliminates tool deflection; ensures concentricity through rigid cutting action ■ Micrometer-stop adjustment ■ Multiple grooves, chamfers, or metering lands ■ O-ring and retaining ring grooves ■ Relief grooves and tube sheet grooves ■ Back-chamfering and facing of deep bores 27

Nobur ® JA Series AUTOMATIC RECESSING DEEP HOLE Nobur ® JA2000 Recessing Head For deep bore recessing and grooving. Designed for heavier cuts than the regular JA. Innovative internal coolant system directs coolant to cutting edges for improved chip evacuation, longer tool life, better tool function, and improved repeatability. For use on machines with internal coolant capability. * Features: ■ Same in-bore pilot support and micrometer-stop adjustment as the regular JA ■ Capable of wider cuts than the regular JA in some applications ■ Extremely durable high-load precision dual bearings for...

Operating Principle Nobur ® JA Series AUTOMATIC RECESSING DEEP HOLE 1 Approach Stroke 2 Feed Stroke 3 End of Feed Stroke The Nobur® JA tool is rotating in The pilot is located in the bore, Radial depth of cut is obtained a machine spindle. The spindle is stopping against the face of the when the micrometer-stop nut lowered. The tool approaches entry workpiece. Downward travel of the bottoms out. Groove location is into the bore. machine spindle compresses the controlled by the adjusting stop- tool so that the cutter feeds out collar, which moves the nosepiece radially into the surface of...

Specifications Nobur ® JA Series AUTOMATIC RECESSING DEEP HOLE The Feed Ratio is the ratio of spindle to radial cutter movement . HEAD TYPE . . . CAPACITY . 1 in mm (A) . FREE in mm . . . in (B) . . . mm in . (C) . mm (D) . MAXIMUM in mm . . (D) . MINIMUM in mm . . . . (E) SHANKS 2 . JA2000 . in 3 0.25 6.300 3.82 97.00 2.28 57.90 2.06 52.30 2.24 56.90 1.24 31.50 1.85 47.10 3/4” straight 1”–12 acme 1-1/16”–12 acme #2 morse taper #3 morse taper 0.25 6.300 4.43 112.5 3.36 85.40 3.00 76.20 1.53 38.90 1.03 26.20 1.85 47.10 1” straight 4 JA (F) mm 3.25 3.63 3.63 3.19 3.88 82.60 92.20 92.20 81.00...

Recessing Head Body Holder Bearing Assembly Stop Pin Adjustment Nut Collar Hub Mounting Retainer Ring-Insert Spacer/Bushing/ Assembly Spring Snap Ring Leaf Spring (Quantity 3) Lock Screw Compression Spring Return Housing-Bearing Screw Retainer Loop Stop Collar Locking-Housing

Bill of Materials Nobur ® JA Series AUTOMATIC RECESSING DEEP HOLE Nobur ® JA2000 Recessing Head NOTE: Coolant location can be changed in the field; consult Sales Department. 1 Spindle 15 Cone Point Screw 22 Retaining Ring 2 O-Ring 9 Socket Head Cap Screw 16 Leaf Spring Details 23 thru 27 optional 3 Compression Spring 10 Bearing Sleeve 17 Coolant Tube 23 Outer Bearing Spacer 4 Spacer Bushing 11 Ball Bearing 18 Housing 24 Inner Bearing Spacer 5 Pin 12 Outer Bearing Spacer 19 Flat Point Set Screw 25 O-Ring 6 Drive Pin 13 Inner Bearing Spacer 20 Bearing Retainer 26 Coolant Nipple 7 Flat Point...

Set-up Nobur ® JA Series AUTOMATIC RECESSING DEEP HOLE Cogsdill Nobur® JA tools are easily set. Since the precision feed motion is built into the head, only two adjustments are required in order to properly set up a tool for operation. Occasionally, compensating adjustments might be required if there is an error in the initial settings, or to compensate for cutter wear. However, by following the steps prescribed below, it will be easy to attain the initial set-up. 1 Set front stop collar This setting determines the position of the groove(s) A relative to the face of the part, or other...

Set-up and Operation Nobur ® JA Series AUTOMATIC RECESSING DEEP HOLE (continued) Diameter Setting Methods In order to measure for a specific groove cut diameter, the tool must be actuated to the limit setting by compressing the actuating assembly against the diameter stop nut. The nominal clearance between the pilot diameter and the minimum bore diameter is .002” (.05mm). Tool Operation Tool Lubrication Cogsdill Nobur® JA Recessing tools operate automatically as In applications where water soluble or synthetic coolants axial spindle travel is converted into radial cutter travel within are...