Thanks for sharing this with us! A lot of the techniques I've learned from you have already come in handy, and the biggest stuff I tend to handle is 40" long but the aspect ratio is similar to that shown here. Your double-tool method for turning 718 Inconel already came in handy, as well.
Please excuse my ignorance here, I have never turned titanium before myself. Why aren't you allowed to use a fixed or travelling steady or cutting oil? Also, holy hell it must have been a pain in the ass clocking that 4 jaw so many times and getting the transitions perfect like that. Pretty certain I wouldn't have done so well, I always struggle getting any better than 0.02 mm so bloody impressive watching you do that.
Shaun Mccaughan cheers Shaun. I get it a lot with titanium. Can't use oil etc. The steady rest compresses the surface. It catches fire on another video I did.
I wonder why they cared about the use of a steady rest? Sure, no marks on the finished surface, but I can't see any issues if you were turning it off. Must be some fear of work hardening due to the pressure or something.
Great video! Just wondering… When finishing, did you take a finish pass of the whole bar or did you go moving the bar as in the roughing? Thanks for sharing
Brilliant job - really good surface finish too! Thanks for sharing. I struggle with a small throat on my lathe so I have to use a fixed steady just to save material. I’ll just have to save my beer money up to buy a Colchester! 😳John 🇬🇧
First of your videos I have found, thanks for sharing them with us!! I have almost no knowledge about turning, so I am wondering why would someone ask you to not using steady rest, cutting oil, and so on? :-)
@@userwl2850 Thank you a lot for replying!! Yes it sounds strange because your chuck is properly compressing way more than a rest would:-) Also, a tolerance for maximum clamping pressure on the rest could maybe sound more logical for a layman. :-)
Doesn't cutting away from the headstock tend to unload the nose-bearing tapers? I'd have thought that would cause more chatter than cutting towards the chuck.
OK, I was just looking at the age of the machine. I was turning some 6" dia loco wheels on a very old 1200 student with a chatter issue. Lifted the lid off the gearbox and reset the taper-backlash on the nose shaft that had a thou or two end-play. All wheels after that were beautifully finished.
hog wash to your processes. thats crazy. ive done 20 ft long 4.5inch Stainless shaft with 1 steady rest and had less trouble than you. better tooling also. that 45 tool sucks.
Great job mate and better still I get to learn something, happy days. Alan.
6 лет назад
The length of the lathe you would have thought your tolerances would move by moving the tail stock forward, however like everything it is the skill of the operator. Nice job.
I used to work at a company called dyson and Nalson, and for approx 5 years that's all I did sometimes had real problems finishing cut, but I used a thread insert to finish it
hi userwl ... have you ever turned a long shaft through the bed of a lathe machine and its diameter is bigger than the hollow spindle of headstock? ... you can share the best solution for they.
Thank you for share.I used this method to process a rod with a diameter of 17 mm and a length of 700 mm, but the effect was not very good. It needed a lot of practice.
I'll exaggerate my question. If I had the same diameter/length in a material like cold rolled steel and you indexed it the same way it would look like the hind leg of a dog when done. So my question is the titanium that you used didn't move at all when breaking all those surfaces in the 3 setups? It must have nil stress. Cheers from Canada.
@@userwl2850 If it was a pc of cold rolled for example yoy'd have the different center lines and the pc would be scrap. Assuming it was indicated within a thou at the chuck was there no distortion in the pc and not require hitting all 3 diameters at the same time. I'm also guessing that any straightness tolerances and not critical. Thanks again cheers.
Mick O Callaghan hi Mick. I'm converting it into a deephole boring machine. I have tons of work to do with it mainly a big oil tank and lots of fabrication parts. I'm limited to 42" long on my turrets .. I will be able to do 150" long jobs on that. I can't wait to get on with it. Cheers. David.
@@userwl2850 box it goes into has to be crafted by Jesus himself, wood from only the garden of eden 🤣🤣 knock it true with ya knob, only thing not on the banned list 🤣
No because any compression of the surface could lead to localised work hardening or surface deformation that isn’t acceptable on this material or application.
