On the picture:
1. Motor spindle, we are using Alfred Jaeger 33 mm motor spindles, all are 3 phase HF AC induction motors (60K RPM and 100K RPM models)
2. Precise linear gauge (0.5 inch, 12.7 mm range, 0.00004 inch, 0.001 mm accuracy!). It measures the current position of the pressure foot (4).
3. Switch plunger, activates a circuit when its surface is even with surface of the calibration pad (7). Factory calibrated to a partial micron on a laboratory class polished granite surface.
4. The pressure foot is spring loaded, it touches the material first, approximately 0.08 inch, 2mm before the tool tip and applies a down force during the machining process.
5. The spindle holder is a precise machined aluminum block that holds the spindle, and the measuring probe and is the housing of the linear ball bearings that are used for pressure foot suspension.
6. The tools, we are using tools that have plastic rings set at 0.8 inches from the tool tip (a World wide standard for the PCB industry).
7. Calibration pad, this unit provides the necessary conditions for precise tool tip calibration.
8. Infrared sensor, this device is able to sense the existence or nonexistence of a tool, a tool ring if it comes off the tool, in the tool holder. In addition to the software tools logistics, it prevents tool conflicts despite operator’s errors.
Why choose a moving gantry?
Manufacturers of similar machines insist that a split axes design is more accurate than a moving gantry design. This statement is false. A split axes design allows you to achieve a high level of accuracy easier. However, there is a price to pay, since a split axis design also means:
• Twice as big a footprint for the same working area
• A constantly moving work piece, which obscures your view of the process
• An expensive light weight table to get the same dynamics.
The competitors that still offer large table models continue to use moving gantry designs for these models (priced unbelievably high).
We are using very tight production tolerances and have the precision needed without the disadvantages listed above. All our units are optically squared between the X and Y axis to the level of 0.0002 inch, 0.005 mm end to end.
Other Recommended Links:
► Myths and truths in PCB prototyping
► System selector
► Comparison table - machines with automatic tool change
► Comparison table - machines with manual tool change
► Our software versus others