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Rotary CNC 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. Provisions are supplied to lock the axis when rotation is not needed. This removes one dithering CNC axis from the machine position loop to slightly improve the surface finish.
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Optical Tool Setter
This video-microscope is mounted on a swing away frame. It can be used to examine tool rotation position and for diamond tool inspection. System includes a 20X, long working distance objective lens which provides a field of view of 0.24mm x 0.32mm.
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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 and the probe tip motion can sense in both up and down directions.
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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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Tool Holder / Flexing Style
This tool holder is a Precitech original, and is preferred by many customers for ease of use and adjustment. A differential screw in the back is rotated to make fine adjustments in tool height through the use of a bending flexure. 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 0.50 inch / 12.5 mm.
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Tool Holder / Sliding Style
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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Vacuum Chip Extractor
This industrial vacuum is used to clean cutting chips from the machine and can be used to collect chips at the source. Continuous duty rated, requires separate electrical power source, 6 gallon capacity.
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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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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 locate of the work piece position without any operator intervention. Machining can start immediately without any "air cutting".
(Photo shown on Nanoform 250 Ultra)
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Virtual Centering Software Upgrade
This software upgrade is used in conjunction with the rotary B-axis. This provides 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.
(Photo shown on Nanoform 250 Ultra)
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Rotary B-axis Radial Error Compensation
The B-axis radial error specification is 4 microinches (100nm) at one inch (25nm) height over the tabletop. The coning error specification is one micro radius 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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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 (up to 1000um) freeform components and micro-structures. 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 digital signal processor, the tool position is calculated and commanded in real time based upon the rotational position of the work spindle and position of the slide. The command is sent to the FTS controller, which closes the servo loop and moves the tool appropriately.
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Machine Enclosure
This option provides an insulated room for the machine including two access doors, one viewing window, and a roof with sliding opening and remote operation. The operator doors are locked when the spindle is running (with excape override from inside). Interior lighting is provided using two florescent lamps.
Temperature Controller
This unit re circulates, filters, and controls the temperature of the air inside the machining zone on Precitech machines. Cold air output from an air conditioning unit is mixed with return air from the machine, then heated to meet strict temperature control requirements. A PID controlled heater maintains the set point with optimum control stability. Water drain from the air conditioner requires collection and disposal by the end user.
Excess air flow pressurizes the machine enclosure keeping out drafts
Temperature is controlled to +/- 0.1C when used in an environment with air temperature same as controller set point within +/- 1.1 C temperature variations.
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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 jog pendant allows the operator to perform some setup functions while away from or not facing the machine controller. For safety purposes, when the remote is active, the main operator controller is not functional. A light is provided on the main controller indicating that the remote pendant is active. Functions provided include E stop, continuous and incremental axis jog, jog increment size, and shift selection.
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15,000 RPM Motorized Tool Spindle
A high stiffness, DC motor driven, air bearing spindle is mounted vertically to an angle bracket located on the B or X-axis. This enables the flycutting of axial grooves. The tool spindle can accommodate wheel sizes up to 100mm diameter and can run with variable, bidirectional speeds up to 15,000 rpm.
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120,000 RPM Turbine Tool Spindle
An air bearing turbine driven spindle is mounted to the B or X-table. This allows marking, grooving, or milling of features into the work piece.
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