Date:	10-15-2011
Number of Hours:	2.75
Brief Description:	Lower firewall + upper firewall
- I bought 2 brand new cobalt drill bits (3/32"). The first bit did not successfully make even one hole in the stainless steel of the lower firewall. I used cutting fluid, went super slow, and used a lot of pressure. NOTHING. Finally the bit shattered and went flying. - Second drill bit, same basic technique, but no cutting fluid. I actually got 3 holes drilled! But after that I could not get any more holes done! The bit would put a little pin prick in the stainless, but that's it. - So I need to come up with a plan B. I have no idea what that may be, but I've gone through 4 bits and gotten 3 holes. - What's weird is that I drilled about 40 holes in the stainless last week while it was flat on the table! Why won't it work now, with fresh bits? I have to give up for now. =============== So I went on to make two more pieces of the upper firewall assembly (photo #1), and then test fit the rear spar carry through (photos #2 and #3). I'll drill these after I get the fuselage leveled back on the saw horses.