Making the flat bottomed holes for the granny ring stubs was a bit tricky. I ended up misusing a couple of router bits as end mills along with a spade bit for some touching up.
No, but there's enough to bear against the chainring bolts, plus I'm thinking of backfilling the holes with Devcon once I make sure chain line and trueness are all OK. One of the holes lined up with a recess on the other side (top left in pic above) so it's thinner than the others. I have another identical plate so if I end up doing MkII I'll change the orientation to suit, 45 degrees will miss it.Not a lot of meat left on the internal after the countersinking but still loving this.
Yeah it went fine in the drill press around 300 rpm. I can't remember where I read you could use router bits on ali but it stuck with me for a long time.Dont stress about using router bits on ali, they work fine just take it easy.
No excuse needed ! but mostly done while she was at work during the day.Looks awesome. Was this an excuse to hang in the shed for 16 hours away from the missus?
Nah it's not heavy at all, and there's still some shaping to be done. I'll post a weight in a day or so when I get back to it.but Looks like it weighs a ton. Couldn't have used thinner material?
Weight is 125g with a little bit to go from final shaping. But I need to take some off the granny ring stubs for better alignment and keep the thickness at the bolt holes. Some McGyvering of a case trimmer length gauge could work for this and keep the faces of the stubs true.A fun back yard Macgyver machining project, but Looks like it weighs a ton. Couldn't have used thinner material?