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I can't see myself accurately boring a 4mm hole 20mm deep in steel with a boring bar - the tool would surely be nowhere near stiff enough? Would a D-bit be more accurate than just using a drill?I'll have a look at chucking reamers - perhaps using the hand reamer first and then the chucking reamer to finish the bottom of the hole. I should have mentioned that the other end of the part is bored and tapped M3 to take a screw that retains the spinner cone, so I'm not that concerned about the weight.Thanks for the advice!AS
A 4mm end mill would be better than a drill.
P.S. How's work, still plenty of time for Netflix
I must have missed the 20mm piece...sorry about that....
Quote from: Jo on January 27, 2019, 12:03:45 PMA 4mm end mill would be better than a drill. I'll have a look and see if I have one in stock - otherwise I suppose a trip to Merrow will be needed...
Quote from: steamer on January 27, 2019, 12:38:32 PMI must have missed the 20mm piece...sorry about that....Probably because I forgot to mention it first time around - I was probably saving the best bit for later... AS
40kN of thrust - should make it into orbit!!!
Sacrifice a reamer and cut the taper part?
Quote from: Noitoen on January 27, 2019, 06:24:17 PMSacrifice a reamer and cut the taper part? I did wonder about that - could I cut it with a carborundum disk in a dremel?AS