How to do this

"Harry H. Arends" <info@time-tech.eu> wrote in message

news:gped9j$21i$1@cheetah.cadsoft.de...

I know how to make a round board but our enginering departement asked me to

produce a disk like the one in this drawing:

http://www.time-tech.eu/Detector_Wheel.pdf

 

Could someone tell me how to do this?

 

Thanks

 

Harry

You only need to calculate ONE hole for this. Work at 3, 6, 9, or 12

o'clock. Lets say you're at 6:00... .

Draw the circular board outline with the origin as center. Draw your first

hole at 6:00.

Copy the hole and place the copy outside the circle, (use a coarse grid if

you can).

Group the board, rotate it by 7.5 degrees, then copy the hole copy back to

the 6:00 position.

Group the board, rotate...

(To rotate the PCB: group the entire PCB, click the move icon, RIGHT click

the group AT THE ORIGIN, type 7.5 in the angle box, ENTER, LEFT click the

ORIGIN. The board should have rotated 7.5 degrees. You might want to make an

index mark at some point on the board before you start, that's up to you.

It would get more complicated if you had to do oddball angles, (maybe,

360/7?) but you could work with some multiple of the base angle - depending

on your allowable error.

Since the total number of holes is divisible by four, you can probably do a

group copy once you're 1/4 the way done, then once again for the second

half. Simply eyeball the placement. You will have extra board outlines on

top of the original that should be removed.

oww, dizzy -gottaa go

"Harry H. Arends" <info@time-tech.eu> wrote in message

news:gped9j$21i$1@cheetah.cadsoft.de...

I know how to make a round board but our enginering departement asked me to

produce a disk like the one in this drawing:

http://www.time-tech.eu/Detector_Wheel.pdf

 

Could someone tell me how to do this?

 

Thanks

 

Harry

You only need to calculate ONE hole for this. Work at 3, 6, 9, or 12

o'clock. Lets say you're at 6:00... .

Draw the circular board outline with the origin as center. Draw your first

hole at 6:00.

Copy the hole and place the copy outside the circle, (use a coarse grid if

you can).

Group the board, rotate it by 7.5 degrees, then copy the hole copy back to

the 6:00 position.

Group the board, rotate...

(To rotate the PCB: group the entire PCB, click the move icon, RIGHT click

the group AT THE ORIGIN, type 7.5 in the angle box, ENTER, LEFT click the

ORIGIN. The board should have rotated 7.5 degrees. You might want to make an

index mark at some point on the board before you start, that's up to you.

It would get more complicated if you had to do oddball angles, (maybe,

360/7?) but you could work with some multiple of the base angle - depending

on your allowable error.

Since the total number of holes is divisible by four, you can probably do a

group copy once you're 1/4 the way done, then once again for the second

half. Simply eyeball the placement. You will have extra board outlines on

top of the original that should be removed.

oww, dizzy -gottaa go