Returned to the fray after failing to get a replacement part locally – out-of-stock. Instead, I threw FreeCAD, lathe and milling machine at the problem and bumbled an Aluminium insert.
The design is a bayonet fitting designed to engage the broken ends of the plastic original:
Could be 3D printed, but I wanted to cut metal. Main issues lack of space and shameful operator error.
Lathe operations straightforward except as designed the sink insert should have a rounded out radius. My ball-turning tool fouled the chuck, but I was able to curve up and out instead.
Milling proved challenging because the mill's ER32 collet comes extremely close to the rotary table when slotting the three bayonet grooves:
Got away with it, otherwise holding the job in a Stephenson Block might have made more room: not sure. Holding small parts in a big mill can be tricky!
The two D shaped holes for drainage went well until I had one of my right-left confusions and wound the cutter into the metal 90° off course, oh dear. Should have started again, but decided to make the damage less obvious by filing. No prizes for this – because I can't file neatly, but the dishevelled result isn't too obvious!
Most embarrassing blunder should have been obvious during CAD design, but I missed it. The cross-bar is drilled to take the chain's clasp. When I came to make the hole, there is no access at 90° and the result of angling in was a nasty gouge, fortunately out of sight.
I mark myself ⁴⁄₁₀ for this. Disguises an ugly hole in the sink and hasn't fallen out yet, but as they often said when I was at school 'Could do better. '
Dave
Edited By SillyOldDuffer on 19/04/2021 15:28:51