ours travells across the worksurface! Has never fallen off but the kneeding process certainly clunks and vibrates the unit a lot. So, normal. Make sure it is positioned as far from edge of worksurface as possible.
Thank you for the info. yes a definite cluck but not a scrapping metallic sound so I am sure it is normal - I noticed it a 4am as I had the machine on a timer so it probably sounded louder than it was.
Lovely to wake up to fresh bread (diet goes out of window)