How to create a perforated annular sheet

[adymech1]

I need to calculate an annular sheet (i.e a ring-shaped sheet) that is perforated. The sheet ID is 22" and OD is 35.5". The hole size is 1/8". The horizontal and vertical spacing between any 2 holes is 3/16". The holes are staggered. How can I go about creating this kind of pattern on an annular sheet?

Thanks for reading.

 

[CorBlimeyLimey]

Treat it like a rectangle ... Do 1 or 2 linear patterns & delete (skip) the holes not required.

from (the City of) Barrie, Ontario.

I tried sniffing Coke once, but the ice cubes got stuck in my nose

 

[jbknudsen]

One method that we have used before is to make the pattern on the id by using two or three planes angled in the proper manner and cut-extrude thru to the od. then array the pattern as needed to match your desired geometry. There may be another way that is a bit better.

Good luck, i will do a little testing and see what develops.

Jay

 

[CorBlimeyLimey]

Or ... make a rectangular perforated sheet first, then cut-extrude the ring.

from (the City of) Barrie, Ontario.

I tried sniffing Coke once, but the ice cubes got stuck in my nose

 

[jbknudsen]

I am assuming that the holes need to be radial. I am working on a 3d sketch that should do what you want. I will get back to you with more info shortly.

Jay

 

[jbknudsen]

adymech1,

I have a model that may help you out. if you want, my e-mail is jayk@dicarinc.net. I can send it to you. this may help you understand how I made the features.

Jay

 

[CorBlimeyLimey]

jbknudsen
I'm confused ... angled planes, 3D sketch, radial holes ... are you creating a perforated cylinder?
Unless I am mistaken, I think the original post was asking how to create a perforated flat sheet "donut".

from (the City of) Barrie, Ontario.

I tried sniffing Coke once, but the ice cubes got stuck in my nose