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Fabrication
Unless your sketches obviously indicate the required
angles, then we require you to specify at least:
Theta, the angle in the horizontal plane from a datum centre line. L, the flange face to focal point distance. Alpha, the angle of a port in the vertical plane. It is advisable to define different levels and focal points with letters as this not only helps us to locate your ports, but also gives you a clearer 3D view of the chamber during design. Naturally we can align your port to the tolerance you require, but not all ports require the same precision. A finely focused electron gun may require a focal spot defined to ± 0.25mm, whereas a viewport for observing sample transfer only needs to be positioned to ± 2mm. There is some confusion as to what port alignment and precision actually mean. Many engineers prefer to define both a flange face to centre distance and an angular tolerance, whereas experimental scientists are often more at home with a deviation from a focal point. Unless otherwise instructed the standards below will be used as a minimum requirement.
Bolt
Hole Orientation
Bolt hole orientation of fixed flanges is in line with the central or major axis of the fabrication, unless otherwise requested. It is particularly important to specify the bolt hole orientation when asymmetric components are to be attached Geometry Standard
Chamber Specifications
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Required
Information 
