Hi out there, hope somebody can give a little advice……
I have a Colchester Student lathe with a square top, can't find the machine no……I guess this vib problem has just crept up on me ……. I've not had it for too long (5-6 years) I know where it came from and it's not a worn out dog……. I think I need to adjust the headstock bearing's…….this is because of a bad vibration / chatter when parting off or taking a medium cut…..anything heavy is out of the question……my work never goes over 2.5 inches in dia….
the chuck has no play in it that I can feel by rocking it and it is very quiet…..if the gearbox selectors are placed between gears ( a false neutral ) the chuck spins quite freely……..the box is also up to the mark with clean oil……
I have even taken to buying new carbide tipped tools (Sandvik) and also after sharpening my normal cutter's I've polished the cutting edge on an oil stone….this has improved the cutting finish but not the vibration…..
when the chuck starts to vibrates I'm sure I can see it wobble…..I'm to scared to take any heavy cut's and am always steady and careful as can be when turning, but it's now getting too bad and I can't say I'm enjoying the experience at all…..I normally machine mild steel and 306 stainless, I 've not tried any ally yet…..as for parting off I obviousley keep the job as near as poss to the chuck….I can help ease the vib's if I use a rotating steady but I can't always use one though……
So my thought's are with the head stock adjustment / preload…….idea's / help, please……
many thanks, Frank Cloggs