Manual Tapping Machine

[Jonathan]

I Just do them by hand

Same... not difficult to get the tap orthogonal, unless I suppose you're drunk or something.
Lately (past few months) I've taken to using the battery drill (dewalt something) on the low speed range. I now use it just for aluminium and M5 to M8. The chuck doesn't appear to be able to hole the tap tightly enough to break the tap. Not broken a tap, though they do sometimes get warm, with it yet and it's so much quicker!