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| Deep hole drilling 101 on lathe? |
| (1/9) > >> |
| PekkaNF:
I got two 10 mm dia 300 mm lenght gun drills. They are well used and sharpened probably to a last useful point. These are for practice. I would like to learn how to drill holes on spindles. Nothing very exotic and demanding - I only have some tempering steel rod tough. I have found bewildering amount of info on web, but I'm having hard time finding a practical starting point. Somehow I find plenty of diagrams and then stuff that is such hardcore that I'm having really hard time assesing relevancy. Wanted: Good practical approach how-to punch deep holes in a domesticated lathe. Tall order? Pekka |
| awemawson:
Start by boring a hole that is accurately concentric, on size, and accommodates a sleeve that is a snug fit on the shaft of your gun drill. Go at it with the gun drill slowly with plenty of lubricant and withdrawals for swarf clearance. ..... or so I am told ....... |
| NeoTech:
I made a gundrill out of a spade bit, then used a short hole drill and made a concentric sleeve that sat on the "outside" of the stock to be bored. So that the inner index wouldnt be messed up or you need to cut the oversized part for the sleeve off. But if i think about it i was prob. cheap and bought just enough barrel material. Errgh.. roundstock... Guns is illegal in sweden. ;D |
| PekkaNF:
Guns are legal here and I have some of them. No interest of making any, because life is short to learn everything and permits and reviews are a hassle. But I have in making some small auxiliary spidles and some grinding spindles... serious case of :proj: Most stuff needs hole for drawbolt, nice concentric hole would be nice on high speed (hobby high speed) spindles. Never thought too much about drilling on the lathe, until broke too many drills in one seating trying to punch holes on tempering steel shaft...that still haunts me. I'm going to drill start hole, ream it and start there. I also can find cutting oil pressure and demand charts, also some feed info. Also pictures of various setups (most professional and outside of my equipment and reach). I can afford breaking two gun drills before learning or giving up. :bang: Pekka |
| chipenter:
I replaced my lathe spindle and made a d bit 16mm dia , the only problem was heat build up as it got hot it would bind in the hole , and it heated up faster than it cooled . Jeff |
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