I'm going to move my existing compost
bins due to a planned house extension. They are just a couple of pallet bays which I throw everything in and empty/turn once a year. It suits my lazy style but does have drawbacks - no lid means the heap is always wet and cool and doesn't kill weed seeds, the birds and dogs fish out anything they think
is interesting (our pup has a few upset tummies I think due to eating something she shouldn't, like overripe pears), and I think a rat family lives in one side. So I have an old wheelie bin maybe 18 in section 4 ft tall. It has a lid and wheels, but has a split up one side. I've been using it for garden rubbish - ie plastic /metal bits that I find or generate in the garden, but I'm wondering whether I can make it into a worm bin.
I think if I only use the new bin for kitchen scraps I won't need such a big compost bin. I do compost most garden weeds and such in situ - chop and dropping etc. Actually I chuck the nastier stuff under my willow fedge and let them fight it out, slowly the soil is building there.
So this (attached) is my schematic of how I'm imagining the bin. I'll find or make a suitable tray that fits in the bottom of the wheelie bin, above that is a mesh which holds the worm chamber material above, but lets finished compost fall into the tray. New scraps, cardboard
, charcoal? are loaded at the top. I'll fish some likely looking worms out of the existing heap when I empty it to start my population.
How big should
I make the holes in the mesh?
Are rats likely to get in - how could the risk be reduced?
What have I forgotten, is that how a worm bin should work?
My climate is mild and moist all year (usually between 5 and 15 deg Celcius), so I'm not too worried about the worms getting too hot or cold. I can make sure the bin is out of the sun (should it ever return!)