Help need for drawing a BMX sprocket- see picture

[willsy]

Hi

Could some please tell me how to divide a circle into 25 even spaces?? And i am tring to draw this BMX sprocket (see link below) I am just having trouble drawing the teeth around the outside. How can i draw them and get them all the same??

Any help would be very good.

I am using autocad 2002.

Sprocket picture here

[craigp]

Quite easy really. Draw a circle then a line from the centre to the top intersection of the circle.

Now draw just ONE of the teeth and centre this on the top of the circle

Type ARRAY then enter
Select polar array (circular)
Pick the centre point (of circle)
Now select the object to array and right click (in this case the single tooth)
If you now fill in the number of teeth required it will now place then aroung the outside of the circle both the same and equally spaced.

You may have to play around with the amount etc... to get it to work perfect.

Hope this helps

[willsy]

Thank you heaps!

[craigp]

Thank you heaps!

No worries hope you sort it out. This was one of the first things i learnt to do i CAD but mine was for a solid model of a saw blade not the easiest thing to start on

[willsy]

Cool, Yeah i have just been teaching myself how to uses it from reading tuts and just mucking around with it, but couldn't work that out.

Thanks again