• 06-13-2017, 07:51 AM
jhg17004
Hi!

I am reading these blueprints of a bread toaster and I just can not figure out how to dimension a fully defined sketch out of this.

My main issue of understanding are these radius annotations. What is the difference between R60 and R40, appart from the obvious radius difference.

May someone shed some light on this matter? I am out of ideas.

[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1926&stc=1[/IMG] [IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1927&stc=1[/IMG]
[I](Bottom view and zoom in)[/I]
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1928&stc=1[/IMG]
• 06-13-2017, 08:13 AM
Kelly Bramble
It's a complex curve composing of several radius... where each radius starts and ends is missing data.
• 06-13-2017, 06:37 PM
jhg17004
I was suspecting this as well but didnt dare to assume it was missing data.

This concerns me. When I attempt to sketch with these dimensions I can not achieve a similar shape.
I will bring this to my teacher and see whats going on.
• 06-14-2017, 07:48 AM
jboggs
You can assume the curves are tangential, else the joint would be a sharp corner. That will help you locate the centers. The center of the larger radius, the center of the smaller radius, and the tangent point will all lie on the same line.
• 06-15-2017, 03:45 AM
jhg17004
Is that why one of the radius arrows extend all the way to the centerline?

Still though, my biggest concern is R20, how does it connect to the others. If its center originates from the centerline, is will look like this. Please im going insane, I feel like im missing out on something fundamental.

Look at this mess!
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1932&stc=1[/IMG]
• 06-15-2017, 04:24 AM
jhg17004
I dont even know whats going on anymore, but this is possibly correct.