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| Deep hole drilling 101 on lathe? |
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| shaddr3:
I joined the forums mainly because of this thread, and found quite a few more interesting threads. I apologize for bringing up an old thread, but wanted to know how this project went. I found unc1esteve's email to ask him about his progress. I'm trying to attempt the same with my lathe. I'm looking at a bore diameter of .4375" at 36.5:1 in 6061 aluminum. |
| PekkaNF:
I haven't got much further, BUT this week local machine tool shop is a sale on MT taper trough cooled extra long spiral drills. My holiday just started...I'm planning to go there, buy few drills and give it a try. I'm wondering would side feed (after the MT-taper) or trough MT-taper. Also I have been making half assed effort trying to find better material. Pekka |
| shaddr3:
What is your longitudinal feed on your lathe? |
| PekkaNF:
--- Quote from: shaddr3 on June 27, 2014, 01:20:00 PM ---What is your longitudinal feed on your lathe? --- End quote --- Uuh...Tail is on manual crankking...pretty well when swarf looks right, but that is really not acceptable because tail stock stroke is way too short. On cross slide I have normal lathe feeds. I have got some results with spiral drill when feed is 0,10 - 0.15 mm/r. Tempering steel is very nice for shaft/spindle, but it's pretty hard in tempered state, work hardens and produces very long swarf - hard to drill well. Turns really nice with lot of speed with carbide though. What are you making? Milling, drilling or grinding spindle? Pekka |
| David Jupp:
For really deep hole drilling, the cutting bit is revolved as well as the work, and lots of lubricant fed to the drill tip to flush out the swarf. I'm aware of a shop in Austria that can drill to 17m for hole size around 2", but that does come down a lot as the hole size reduces. |
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