ACS Type
You can choose from these ACS types: Rectangular, Cylindrical, and Spherical.
Rectangular
Points are specified like the design cube coordinate system, with coordinates expressed in the form (X,Y,Z). You can use AccuDraw to define, save, and retrieve rectangular ACSs.
Cylindrical
Points are specified as two magnitudes (R and Z) and an angle (q), with coordinates expressed in the form (R, q, Z).
The process of locating a point in a cylindrical ACS can be thought of as follows:
 Moving from the origin along the xaxis a distance of R.
 Rotating about the zaxis at an angle of q.
 Finally, moving parallel to the zaxis a distance of Z.
These are used to position a data point with a Cylindrical ACS:

AX=R,q,Z for an exact location,
where:
R is the distance from the origin, along the xaxis.
q is the angle counterclockwise from the xaxis about the zaxis.
Z is the distance in the zdirection.

AD=ΔR,Δq,ΔZ for locations relative to
a tentative point, where:
ΔR is the difference in distance from the origin, along the xaxis.
Δq is the difference in the angle counterclockwise from the xaxis.
ΔZ is the difference in the distance in the zdirection.
Spherical
Points are specified by a magnitude (R) and two angles (q and f), with coordinates expressed in the form (R, q, f).
The process of locating a point in a spherical ACS can be thought of as follows:
 Move from the origin along the xaxis a distance of R to establish a radius vector.
 Rotate this vector about the zaxis at an angle of q.
 The angle f is the angle between the radius vector and the positive zaxis.
These keyins are used to position a data point with a Spherical ACS:

AX=R,q,f for an exact location,
where:
R is the radius vector distance from the origin.
q is the angle counterclockwise from the xaxis about the zaxis.
f is the angle between the radius vector and the zaxis.

AD=ΔR,Δq,Δf for locations relative to
a tentative point, where:
ΔR is the difference in the radius vector distance from the origin.
Δq is the difference in the angle, counterclockwise, from the xaxis.
Δf is the difference in the angle between the radius vector and the zaxis.