macro bolt circle

[jdsmith0524]

i have a toyoda fh-100 with fanuc controls and no bolt circle g-code option .i understand some of what macro commands are about but don't know where to start with this one.anybody know where i can find an example(besides the manual) or maybe something else?thanks!

[gar]

070516-0727 EST USA

Can you do this:

G54
G52 (to set x=0 and y=0 at the center of the bolt circle)
Assume first hole is on the X-axis, bolt circle radius is Rad, and angle between holes is Theta

#500 = Rad
#501 = Theta in degrees


First hole is at
#502 = #501 * 0
#100 = #500 cos #502
#101 = #500 sin #502
G0 X #100 Y #101
Do hole

Second hole
#502 = #501 * 1
#100 = #500 cos #502
#101 = #500 sin #502
G0 X #100 Y #101
Do hole

Repeat as many times as needed incrementing the multiplier on #501 each time.
All this can be done in a loop.

,

[jdsmith0524]

thanks! just a little more help, what might the loop look like?

[gar]

070516-1843 EST USA

Here is a possibility:

Assume the bolt circle center is at the coordinate system zero.
You may have to adjust useage of decimal point.
First hole location is defined by the value in #502 for start angle, #500 for the radius, and the above assumption of coordinate system zero.
Following this all holes proceed in a counterclockwise direction.
Note: by using the integer multipler #504 there is no cumulative position error.

#500 = Radius
#501 = Number of holes
#502 = Angle from X-axis to first hole. + is counterclockwise from X-axis.
#503 = Angle between holes
#504 = Hole count. A number incremented to identify the hole being processed.

#503 = 360./#501
#504 = 0 (initialize hole count to 0) (first hole has an index number of 0)


N100
#510 = #502 + [503 * #504]
#100 = #500 cos #510
#101 = #500 sin #510
G0 X #100 Y #101
Do hole
#504 = #504 + 1.
IF [#504 GE #501] GOTO 200
GOTO 100

N200
Done

See if I made any logic mistakes. You may need some minor modifications to run on your machine.

.