Gents,
I need to bore a taper in an aluminium hub to fit a 6mm diameter crankshaft with a 5 degree taper (see pic). In an ideal world I would have turned both pieces without disturbing the top-slide setting, but that wasn't an option.
I've been told I need to blue the crankshaft to test the fit in the bore when setting up the top-slide angle. I assume that means spotting blue or bearing blue (the stuff that doesn't dry)? If so, I don't have any. However, I do have a 20g packet of ferric ferrocynide, which I think is Prussian Blue. There was a thread a while ago in which some posters were mixing it with either oil or grease to make their own spotting blue.
Can anyone recommend a good mix for this job?
Chris