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Rotary Oil Bearing B-Axis
The Rotary B-axis is a direct drive, oil hydrostatic bearing, with an integral high resolution encoder, brake, optional limit switches and optional hard stops. The Rotary B-axis option allows ultra precision machining in tool normal mode which allows the use of non waviness controlled diamond tools, or higher sweep components. It also allows tool rotation needed in the production of some diffractive lenses. A tee slot plate is available to allow a traditional setup with multiple tools / front surface probe / Ultracomp to be mounted in line on the locked B-axis. Swing capacity over the B-axis tabletop is 381mm diameter for the Freeform 700A.
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Tool Holder /3 Axis Adjustable
This tool holder is provided with three axes of adjustment in the X, Y, and Z directions. These are required to position the tool tip exactly over the center-line of the rotary B-axis. This is required if Virtual Centering software is not provided on the machine, and is optional to be used together with Virtual Centering.
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Virtual Centering Software Upgrade
This software upgrade is used in conjunction with the rotary B-axis. What this provides is the ability to select a position near the B-axis centerline and move the X and Z-axes in coordinated motion with the B-axis rotation so that this selected position rotates as if it is the centerline of the B rotation. This could be the edge or center of the tool radius, or the cutting edge of a grinding wheel. Having this software upgrade simplifies setting up tooling on the B-axis.
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Rotary B-axis Radial Error Compensation
The B-axis radial error specification is 4 microinches (100nm) at one inch (25mm) height over the tabletop. The coning error specification is one micro radian which increases this error motion the cutting height. This procedure measures the radial error motions of the rotary B-axis at the spindle centerline height and implements software corrections to minimize these errors by the use of the X and Z-axes motion during B rotation. Basic error motions plus coning errors are reduced to less than 2 micro inches (50nm) total at the spindle centerline height.
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Optical Tool Setter
Portable video-microscope utilizes a kinematic mount on top of the spindle housing. An electronic crosshair allows precise location of the tool relative to spindle centerline horizontally while vertical location of the tool is set by the focal plane. Tool tip inspection can be easily achieved while viewing the monitor. System includes a 20X long working distance objective lens which provides a field of view of 0.24 x 0.32nm.
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Integrated Gage Head
This electronic indicator and amplifier are for use by the operator in aligning a work piece with the spindle, or measuring small motions of tool height adjustment, etc. The resolution of the indicator is 0.1 micron (5 micro inches) and is shown on the UPX display screen. The full range is +/- 0.25 mm (0.010 inch). The gage head is provided with a magnetic base for flexibility. The probe tip motion can sense in both up and down directions.
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Ultracomp
This system includes an air bearing LVDT electronic displacement gage, mount for the gage, amplifier electronics, and software that runs on the machine controller. The gage is used to scan the work piece by using the machine axes. The measured surface is compared with the programmed motions and an error profile is developed. The error profile is then subtracted from the part program. After compensation all subsequent machine passes will create parts with nearly all of the axis-symmetric repeatable errors removed.
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15,000 RPM Spindle with Horizontal Mount
A high stiffness, DC motor driven, air bearing spindle is mounted vertically to an angle bracket located on the Z-axis. This enables grinding of glass optics, grinding of steel mold inserts, or spiral milling diamond turnable materials. The tool spindle can accommodate wheel sizes up to 100mm diameter and can run with variable, bidirectional speeds up to 15,000 rpm. It can be used together with a fixed diamond tool holder for preparing fixtures or easily converted from grinding to diamond turing.
Not for use with water based coolants.
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LVDT Tool Setter /Horizontal
A horizontal contacting type tool set station can establish tool or grinding wheel radius to an accuracy of 0.4µm (10µ"). The tool setter utilizes a kinematic mount on the top of the spindle with high repeatability. Tools are automatically probed in several positions and the associated data is acquired by the controller, which accurately computes tool radius and X offset position.
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LVDT Front Surface Probe
A horizontal contacting type probe is mounted alongside the tool holders on the Z slide or B tabletop. This is used to determine the face of the work piece position in Z to automate finding the surface and start machining immediately without cutting “air”.
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ACT Software Upgrade
Adaptive Control Technology (ACT) software continuously adjust servo control parameters in real-time for the specific machining task and work piece running on the machine. ACT actively cancels repetitive sources of error. The benefits of ACT are most apparent for machining tasks involving high velocity machine motion (ex. Slow Tool Servo) or when continuously varying processing conditions (ex. ramping spindle RPM across parts during STS processing). This is recommended for use with the C-axis option and is not of assistance if the spindle does not have C-axis.
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Fast Tool Servo FTS 70
Fast Tool Servo FTS 500
Fast Tool Servo FTS 1000
The Fast Tool Servo ( FTS ) is used for rapid manufacture of small departure freeform components. A FTS includes a short stroke actuator which holds a diamond tool and mounts onto the Z-slide of a lathe. The actuator is driven by either a Piezo electric stack or linear motor with closed loop position feedback. With the use of a dedicated controller, the tool position is calculated and commanded in real time based upon the rotational position of the work spindle and position of the slide. While the machine tool is moving X and Z through a part program, the Fast Tool Servo receives input of the slide and spindle positions and calculates (real time, on the fly) the tool position for the tool. This tool position is then commanded to the FTS controller, which closes the servo loop and moves the tool appropriately.
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Chiller for Work Spindle
A closed loop, refrigerated chiller is used to stabilize the temperature of the machine and spindle. This is powered separately from the machine, and operates separately from the machine controller. With a capacity 1400 watts, it is available in multiple voltage and frequency options. One chiller can be used to maintain temperature of up to two diamond turning lathes, or one machine with grinder spindle.
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150mm Swing Flycutter Head
This tool holder mounts to the SP-150 work spindle. By spinning the tool on the work spindle, a flycutter is made that can diamond flycut stationary flat surfaces in one pass. When used with the rotary B axis or an Ultradex indexing unit, polygon surfaces can be flycut. Tools in this head are adjustable in both rake and roll angles.
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Coolant Shroud for SP-150 Spindle
A two piece shroud is supplied to capture diamond turning chips and coolant that is sprayed from the work piece. This is typically used in the diamond turning of crystalline materials but it can help contain other materials as well. The top half of the shroud can be removed for access to the part or for use of the tool setter. The shroud has a large opening to allow multiple tools to access the part for rough and finish operations.
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Part Programming Software
Precitech offers an aftermarket software (DIFFSYS) for the creation of part programs. This software is available in a variety of configurations (aspherics, diffractives, freeform surfaces) and with or without measurement corrective feedback functionality. Cost varies with the functions desired.
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Observation Camera and LCD monitor
A camera with zoom lens is mounted on a magnetic base for flexible setup. The image is displayed on an independent 15 inch LCD color display monitor and does not interfere with machine setup or operation. The field of view size can be varied by the zoom lens from approximately 2 mm up to 8 mm. The working distance is 90 mm.
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LED Task Lamp
The LED task lamp is used to improve illumination of the working zone without the addition of heat. It comes mounted to the machine enclosure with a gooseneck flexible mount. This allows the light to be oriented as desired by the operator. There is a switch on the head for turning the light off when not needed.
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Remote Jog Pendant
This remote jog pendant allows the operator to perform some setup functions while away from or not facing the machine controller. E stop, axis selection and axis jog.
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Tool Holder and Riser for Slide of Rotary B-axis
This tool holder has greater stiffness than our flexing style tool holder, and the tool motion is pure vertical translation. It is provided with two lengths of tool nose for flexibility. A differential screw is used to make fine height adjustments directly to the tool carrier. The tool can be adjusted in height by 0.014 inch / 0.35 mm using the differential screw, and remounted to increase the range of height adjustment to 1.0 inch / 25 mm.
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Field Balancer
Balancing unit for use in balancing the tools on the flycutter head. Portable and battery powered for use in measuring unbalance on any rotating machinery.
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