Formula for B axis rotation on machining centre?

[fitzpatrick2362]

Can anyone tell me the formula for X and Z co-ordinates when you rotate the B-Axis around the centre of a horizontal machining centre and the you have a part or fixture which is sitting at z200.

Assume that the part has been loaded at X 0, Y 0 and the hole is on Y0.


eg. Say I want to drill a hole at 45° on a diameter.
My component is Z200.0 from the centre of the table(centre of rotation).
I rotate the B axis 45° around the centre of the table .
What would my x and z figures be.

[Glacern]

I'm guessing you have a cylindrical part clamped to a tombstone, and the cylinder is oriented vertically, parallel to the Y-axis? Also, you want X-zero to be the center of the cylinder?

Z-zero = cos(B) * (200.0 - R) + R
X-zero = sin(B) * (200.0 - R)

B = B-axis rotation in degrees
R = Radius of the workpiece

Different formulas if you're cutting flat workpieces.

-Sol
Glacern Machine Tools

[ZedB]

Hello fitzpatrick,
you can download and use CNCOffsetCalculator for calculation of the offsets on horizontal machining centres - it gives you the X,Y,Z coordinates (if you know exactly the position of the workpiece) or it generates a CNC code (G10 code or system var) and the machine will calculate the offsets when it runs.
You can download the program from cncplusplus.com
Regards,
Zdenek