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Help Me Understand Some Geometry....

5 REPLIES 5
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Message 1 of 6
glencandle
141 Views, 5 Replies

Help Me Understand Some Geometry....

Backstory: I'm an artist, not an engineer, and I need some help understanding this:

 

I want to cut a small channel (1/64") into my part, with a 1/32" diameter fillet in the corner.  When I draft this manually all is well except that where the channel 'bends' it gets wider (3/128").  I don't want this.

 

glencandle_0-1706646884395.png

 

I know I can adjust this manually, but as I seem to encounter this kind of thing from time to time I would rather understand the math so I can approach this problem with some precision as my skill evolves.  

 

Cheers.

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5 REPLIES 5
Message 2 of 6
glencandle
in reply to: glencandle

Never mind I figured it out.  And since I can't delete the question (I still can't figure out why Autodesk doesn't allow us to delete our own posts!), here is the answer:

 

The inner radius needs to the diameter of the outer radius, minus the width of the channel.  In this case the inner radius needs to be 1/64" to maintain the same sized channel throughout the bend.

 

Cheers.

Message 3 of 6
davebYYPCU
in reply to: glencandle

Yep, both radii should have the same centre point.

 

Might help...

Message 4 of 6
johnptc314159
in reply to: davebYYPCU

FYI

 

for clarity i like to see circles 🙂

Message 5 of 6
johnptc314159
in reply to: davebYYPCU

oops

Message 6 of 6
glencandle
in reply to: johnptc314159

Ooh I like this. I’ve never sketched this way but it definitely helps. Thanks for the tip!

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