On Dec 26, 12:04*am, Winston wrote:
Denis G. wrote:
On Dec 25, 10:06 am, *wrote:
Can anyone tell me how I can avoid this?

I want to design a part using the same
kind of metal - to - plastic interface as on
the Krups 203-70 coffee bean grinders but I
want to avoid the cracks in the corners.

If it gets posted it will be:

http://www.metalworking.com/dropbox/KrupsKrack.jpg

http://www.metalworking.com/dropbox/KrupsKrack.txt

(....)

It could be a material problem or maybe the part that broke was
designed to use the minimum amount of plastic necessary in order to
cut manufacturing costs. *You could try your hand at plastic welding,
maybe with a small soldering iron and proper tip.
Another possibility
might be solvent welding if it’s made of PVC.

I'm not going to repair the existing grinder, especially since
I need a different type anyway. (Who knew?)

I’ll bet that the part
wouldn’t have broken if the sections were thick enough.

My application will use softer plastic, so perhaps
cracking won't be an issue.

--Winston

The only issue with a softer plastic might be a greater likihood of
staining, but maybe it won't matter for your application.