Richard Parsons | 30/05/2010 10:10:40 |
![]() 645 forum posts 33 photos | Hi Steve You say “A mate suggested that the machine was not running fast enough but it is at the highest rpm that the belt system will allow”. Therein lays the rub. Long ago I learned a sort of rule which allows you to approximate the speed of a lathe/milling machine. For mild steel it is speed = 288/D where D is the diameter in inches (or speed = 7315/D if your in millimetres). If you are machining a bit of 1inch mild steel you should run at about 300 RPM or the nearest and perhaps lower speed your pulleys will give you. For harder metals choose a slower speed. If your tool is ‘singing or chattering’ then slow the spindle down. Choose your tool shape with care. Much has been written about this almost any My Hobby store booklet on lathe work will tell you. Make sure that your tool edge is sharp. I ‘rub mine up on a cheapo diamond or an Hope this helps. If it is any comfort two weeks a co I was machining a chunk of 40mm (probably Bulgarian) steel down to make a 27mm pin for an old Hungarian tractor. I had taken 15mm off and the work piece literally fell in half. Oink! Good luck |
bricky | 06/06/2010 17:17:41 |
627 forum posts 72 photos | Hi Steve.
I Have nothing to add from the previous advice except that if finances permit The Diamond Tool Holder as advertised by Eccentric Engineering is a brilliant tool.This is so easy to sharpen and to set to height and with the sharpening jig supplied to can,t fail to get a sharp tool.My work has improved greatly since i have been using one.Make sure it,s tight if taking interupted cuts.Hope this helps on top of all advice .
Francis |
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