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Linear measuring system
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Linear measuring system Unveiled recently, Heidenham's Certo comprises a CT60 digital length gauge, granite base stand and VRZ 210 display. An accuracy of -+ 0.1 /~m over the full travel of 60mm (at 19°-21 ° C) ~s claimed for the system. The incremental measuring principle of the length gauge incorporates a quartz scale with a 'Diadur' grating which is scanned photoelectrically. A marker pulse on the scale allows simple re-establishment of datum point after power interruption, switch.ng off or zeroing. Heidenhain (GB) Ltd, 200 London Road, Burgess Hall, West Sussex RH159RD, U K o r Dr Johannes Heldenham GmbH, Postfach 1260, D-8225 Traunreut, FRG
machined surface during the return stroke, where applicable, to prevent scoring. The system is designed to be used in combinatfon with any post process gauging system; the gauging equipment feeds back signals to a m=croprocessor-based control unit which operates a stepping motor attached to the compensator. Th~s, m turn, adjusts the setting of the cutting edge. Metric or imperial operation can be chosen. Radial range of the compensation movement is 0.001 mm to 0 199 mm while the range of retractlon is 0.01 mm to 0.39 ram. Metalworking Products Division, Sandvik Limited, Manor Way, Halesowen, West Midlands B62 8QZ, UK
5-axis milling machine
The Certo display counter has a digital step of O. 1 #rn. The V24 data output permits connection to a printer or input to a computer for data processing of the measuring value.
Tool wear compensation Special-purpose boring machines can be fitted with an automatic tool wear compensation system developed jointly by Sandvik and Marposs. The system allows the cutting edge of a rotating tool to be repos~tioned to compensate for wear in variable steps from 0.001 rnm to 0.099 mm to a presentable maximum deflection up to 0.200 mm. Tool wear compensation may be negative or positive, depending on the d~mensional variation of the previously machined part. Backlash elimination ~s incorporated m the system and, in addition, the Autocomp system allows retraction of the cutting edge from the
60
Designed primarily for the aerospace industry, the BostoMatic 5-Axis profile milling machine uses a programmable 5th-axis tilting spindle, with rotation centred about the cutting tool tip. In the machining of centrifugal impellers and axial flow rotors the tilting spindle technique has resulted in greater accuracy of the blade profile, substantially shorter program tapes, and improved cutting rate control and tool rigidity. Accuracy at the part is stated to be -+ 0.0003 in (7.6 #m) - -+ 1 minute of arc rotational accuracy - because the working distance from the pivot of the B-axis is only the depth of the cut. The tilting head eliminates the problem of maintaining a constant feed rate while one slide is chasing the part; the tool tip tracks the junction of the hub and the blade as though it were a 3-axis die sinking operation. The constant feed rate is completely independent of the B-axis movement and enhances cutter life and finish. A rotary 4th axis and tailstock, bolted solidly to the table, provide rigid support for integral shaft rotary components. A three-point cast iron base and box section castings, used for all structural members, produce rigidity, good damping and lasting alignment accuracy. The 5-ax~s milling machine has a working envelope of 26 in (660 ram) in the X-axis and 14 in (356 mm) in the Y and Z axes. Each axis =s drzven
A Marposs automatic too/wear compensation system to fit to special purpose boring machines is available from Sandvik
by its own closed loop, dc servo system with optical encoder feedback, System resolution =s 0.0001 in (2.54/~m). The A-axis swing is 12 in (305 mm) with 26 in (660 ram) between headstock and tailstock, and the B-axis pivots 100 ° either side of vertical. The fifth ax=s tilt mechanism consists of a pre4oaded gearset for smooth, backlashfree, bi-directional movement, a large diameter bearing for rigidity and a simple spring and cable counterbalance system for stable control of the head through its 200 degrees of motion. Boston Digital Corporation, 86 South Street, Hopkinton, MA 01748, USA
Bostomatic's 5-Axis milling machine features a programmable fifth~xis tilting spindle which results in improved cutting rate control and tool rigidity
A P R 1983 V O L 5 NO 2
Linear measuring system Unveiled recently, Heidenham's Certo comprises a CT60 digital length gauge, granite base stand and VRZ 210 display. An accuracy of -+ 0.1 /~m over the full travel of 60mm (at 19°-21 ° C) ~s claimed for the system. The incremental measuring principle of the length gauge incorporates a quartz scale with a 'Diadur' grating which is scanned photoelectrically. A marker pulse on the scale allows simple re-establishment of datum point after power interruption, switch.ng off or zeroing. Heidenhain (GB) Ltd, 200 London Road, Burgess Hall, West Sussex RH159RD, U K o r Dr Johannes Heldenham GmbH, Postfach 1260, D-8225 Traunreut, FRG
machined surface during the return stroke, where applicable, to prevent scoring. The system is designed to be used in combinatfon with any post process gauging system; the gauging equipment feeds back signals to a m=croprocessor-based control unit which operates a stepping motor attached to the compensator. Th~s, m turn, adjusts the setting of the cutting edge. Metric or imperial operation can be chosen. Radial range of the compensation movement is 0.001 mm to 0 199 mm while the range of retractlon is 0.01 mm to 0.39 ram. Metalworking Products Division, Sandvik Limited, Manor Way, Halesowen, West Midlands B62 8QZ, UK
5-axis milling machine
The Certo display counter has a digital step of O. 1 #rn. The V24 data output permits connection to a printer or input to a computer for data processing of the measuring value.
Tool wear compensation Special-purpose boring machines can be fitted with an automatic tool wear compensation system developed jointly by Sandvik and Marposs. The system allows the cutting edge of a rotating tool to be repos~tioned to compensate for wear in variable steps from 0.001 rnm to 0.099 mm to a presentable maximum deflection up to 0.200 mm. Tool wear compensation may be negative or positive, depending on the d~mensional variation of the previously machined part. Backlash elimination ~s incorporated m the system and, in addition, the Autocomp system allows retraction of the cutting edge from the
60
Designed primarily for the aerospace industry, the BostoMatic 5-Axis profile milling machine uses a programmable 5th-axis tilting spindle, with rotation centred about the cutting tool tip. In the machining of centrifugal impellers and axial flow rotors the tilting spindle technique has resulted in greater accuracy of the blade profile, substantially shorter program tapes, and improved cutting rate control and tool rigidity. Accuracy at the part is stated to be -+ 0.0003 in (7.6 #m) - -+ 1 minute of arc rotational accuracy - because the working distance from the pivot of the B-axis is only the depth of the cut. The tilting head eliminates the problem of maintaining a constant feed rate while one slide is chasing the part; the tool tip tracks the junction of the hub and the blade as though it were a 3-axis die sinking operation. The constant feed rate is completely independent of the B-axis movement and enhances cutter life and finish. A rotary 4th axis and tailstock, bolted solidly to the table, provide rigid support for integral shaft rotary components. A three-point cast iron base and box section castings, used for all structural members, produce rigidity, good damping and lasting alignment accuracy. The 5-ax~s milling machine has a working envelope of 26 in (660 ram) in the X-axis and 14 in (356 mm) in the Y and Z axes. Each axis =s drzven
A Marposs automatic too/wear compensation system to fit to special purpose boring machines is available from Sandvik
by its own closed loop, dc servo system with optical encoder feedback, System resolution =s 0.0001 in (2.54/~m). The A-axis swing is 12 in (305 mm) with 26 in (660 ram) between headstock and tailstock, and the B-axis pivots 100 ° either side of vertical. The fifth ax=s tilt mechanism consists of a pre4oaded gearset for smooth, backlashfree, bi-directional movement, a large diameter bearing for rigidity and a simple spring and cable counterbalance system for stable control of the head through its 200 degrees of motion. Boston Digital Corporation, 86 South Street, Hopkinton, MA 01748, USA
Bostomatic's 5-Axis milling machine features a programmable fifth~xis tilting spindle which results in improved cutting rate control and tool rigidity
A P R 1983 V O L 5 NO 2