I am trying to build the Lady Stephanie beam engine, Vol 3 page 211 in Engineering in miniature.
I have started work 2.3mm Drill spotface for 8BA on top, 3/16" under.
I have checked the dimension of the drill for 8BA and it is 1.8. I am assuming spotcase is to put like a lead in (probably flat, though I don't have a flat drill).
Should I be drilling right through and with what? an 8BA tapping drill, do I need to tap the hole?
Something else that is confusing me on this drawing... it may be too much information here for what is needed...4 holes tap 8BA 5/32" deep, stud 1 3/16" long. Do I need to know what the stud is? If so, what does that mean for the hole?
Thanks for your help. I have a little more work to do on this, so will check back shortly for any responses.
Best regards, Dave Colliver.Customise your internet experience