[Bill_B]

2 Questions.

We have the Tormach 440 and I have a deep part that is 2.25 tall with a center bore. We have the long-reach arbor TTS tool holders with the 25mm mill head.

The question is can I use this tool for my finishing passes? Surface quality is not a huge factor for this application but we still want a nice-looking part. The cylinder that makes up the bore ID and OD is not a dimensional aspect of the part function.

Deep drilling, same depth I need to make 4 .25 holes in this part all the way through. Holes will be drilled after facing, then will cur the bore.
Should I go with a carbide drill bit for this? or will standard tin coated jobber bit be fine?
Should I do a pilot hole all the way threw