Machines | Aluminium machining on 1K62 lathe - heavy duty drilling (52mm bore)

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1. what does it matter if it runs 5rpm or 500rpm if theres an adequate hole during the same day. Besides 3,5mm thick chips are cool.
2. I used to work in a production shop, the only thing I did on a lathe less that 400rpm was OD thread cutting with a single point. If it was me, I would used a smaller drill and then the bigger drill to ream the hole basically. Non of that any slower that 750 rpm. Aluminum is a walk in the park compared to a tough alloy
   
3. lol
4. Yes, I know different type carbide drill bits, also drill bits with carbide inserts too, but for them need hi-presure coolant pump - presure over than 25 bar. Sandvik have lot of carbide and drills with inserts... something of that I have => they cut awesome! For aluminium - best coolant is kerosene, turpentine or WD40... can use diesel too... I use diesel, because it is cheaper. P.S. My view is so- too high speed can kill Your tool at any time, for all that to You cool it very good.
5. Oh i am not talking about feedrates here, I'm talking surface speeds. and only on mild steel is the rule of 300rpm per inch in diameter very accurate. You'd be amazed how fast you can drill with carbide, in a shop I used to work in we used a 30mm ksem through coolant drill in 6061 ali at 2000rpm, I can't recall the feedrate but it cleared out 80mm of material in around 7-8 seconds. But yeah with coolant you could easily run that drill at 250rpm, try it, you'll be surprised by the results.
6. Well, I too always use the coolant, maybe in this case the botle with coolant was not on lathe... but it is no important any more. By the way - I too earn by metalworking.... Actually I was to study the "Forest Management", but metalworking I learn up be self-education way since 2009 Ah- 300rev per inch (25,4mm) => 0.085mm/rev... I would to set lower speed and 0.13 to 0.5mm/rev +coolant. How do You think - by 50mm drill bit can to drill the steel CrMnW or steel 18CrNiMoN at 130...150RPM???
7. I use no coolant because it not sense to use for one (1x), 30mm depth bore. 63RPM is so slow to not necessary use coolant... thick aluminium piece can good take away heat, drill bit is in good shape too.
8. Yeah that's a good point, but 63rpm? that is horrendously slow, i mean on mild steel with coolant that's the speed (approximately) a 5" drill should be run at. Fair point about the lack of coolant though, I always use coolant on HSS. i'd still be running that up at 130-150 for such a short depth hole, hey it get's the job done anyhow. Just my 2 cents :) why aren't you using coolant anyhow FactoryDragon? Unless cutting plastic i always use coolant on high speed steel.
9. There seems to be no coolant (I don't know why), so it makes sense to take it slow rather than re-grind that big HSS drill. Hot aluminium eats HSS for breakfast. 
10. You do realise I do this for a living? in stainless id be running that at 110. 63rpm in Aluminium is a joke. the general rule for mild steel is 300rpm per inch, so your hole size of 52mm is near enough to an inch to round it so 150rpm. Seriously man i've run a 3inch drill into 1045 mild steel at 105rpm and it cut beautifully. I am a machinist who does this every day. You might want to do some research before dismissing my advice.
11. That HSS drill bit diameter is 52mm (!!!!), so You want sat that to You will run it by 150RPM into the steel or by 250RPM into the aluminium???? 52mm is great drill bit, so by high speed You can easy burn down Your tool. 63RPM business is that to my tool not heat up and not to burn down. P.S. Your suggested speeds is good for D=30 to 38mm drill bit.
12. Bro, in mild steel i'd be running that at 150rpm so you could easily take that at 250 in Aluminium. What's this 63rpm business?
13. Yeah!
14. "Like a hot knife through butter!" Roy
15. "Fast as I can turn the tailstock handle" - that's hilarious! 
16. Thanks! 
17. nice chip! ;-)