Hi Olly. Very interesting to see how you overcame the thread cutting problem. Well done getting this far. A little more future fettling and it will be perfect. 👏👏👍😀
Great job thread milling! People kept telling me that wouldn’t work, I’m glad you proved it! I picked up a Sherline, was planning to use that as my driver, similar to your setup.
Thanks Dan. I saw Stefan Gotteswinter do the same thing several years ago, and the idea has been in my mind since. I may yet add some kind of reduction drive to the lathe, as I reckon, going slowly enough, using the tool post spindle, it should be possible to cut a sensible size thread in a single pass.
Good to see you back in the workshop Olly! Given your face plate won’t fit anything this side of the Science Museum, I think I’d have just bored it out and press fitted a suitable pin / arbor / Morse something. But that wouldn’t have yielded a novel thread cutting technique. Which is excellent! I reckon single pointing would have taken quite a few passes at that scale in EN8, and there would have been much greater chance of crash damage. Though I’d wager fewer splinters in your fingers! Looking forward to the next one. Matt
I definitely considered not going down the threading route, but I really don't like modifying things in a non-reversible way. My thinking was by making a threaded arbour I can mount it on my current machine, but it doesn't close the door on other mounting situations. Unfortunately each of those alternative situations that I've thought of all require their own threaded arbour!😫
Where there is a will, there is a way. I have noticed that the factory machined products are no longer machined to the high standards of yesteryear. Your problem-solving skills are inspiring!
I think the out of roundness on this one is due to stresses in the cast iron. I'll measure it again when I come back to it, as it may well need another very light skim when it's had a chance to rest.
Interesting approach Olly, I know the buzz is finding ways to overcome problems (which you have already done and proven with your thread now). Offer still stands mate, if you want me to knock you a threaded spindle out to your newly bored diameter, you know where I am😊. Cheers, Jon
If it's only a few threads on the end of a bar, I don't bother power feeding anymore. I find it quicker and waaay less stressful to just stick a cranking handle in the other end of the spindle.
Nice work Olly! By the way, if you're mounting it on an MT4 arbour, wouldn't you be wanting one with a drawbar? Think there might be a chance of it coming loose without one, i.e. from the side loads?
That's a good point. I found that MT4 to MT2 extension arbour on eBay for a good price, it was new old stock, so no choice of tang or drawbar unfortunately. Hopefully it's not too hard to drill out. I've had several end mills that were MT2 with a tang, some have been possible to drill out, others I've had to cut off a section and weld on a threaded sleeve. All that aside, I did wonder at one point why I didn't just adapt it to fit the flange on my lathe, but I suppose there wouldn't have been a thread to cut if I had done that....
Hi Olly, That first cut must have frightened the life out of you!! Good to see your auxiliary spindle in action, what was the finish like on the thread before chasing it? On a different subject, what is the state of play on the jet engine ignitor? All the best!!
Hi David. The spindle works well, but it's a lot slower than I hoped. That said it was an enormous thread, and pretty hard material. It would have been a breeze in aluminium. The finish of the thread was as you would expect from a hand turned, milled part: lots of slight dents at the points where I stopped to reposition hands, and also a general pattern, probably to do with the cutter and speed of the spindle. The HSS thread tool cleaned up all the threads with a handful of passes. The jet thing has stalled a bit due to complications with the testing facility, but it's looking like it may start moving again soon. If anything interesting happens, I'll let you know.
Was there a reason why you didn't use the back tool post and cut the thread away from the chuck in reverse, i believe you'll still end up with the normal thread. Good video though
Hi, The rear toolpost was made for the parting tool, and isn't adjustable, and I'm too lazy to shim a threading tool when I've got one ready to go in a QCTP holder! That said, it's not a bad idea to have a threading tool on the rear toolpost, although to cut away from the chuck on the rear, it would need to be the right way up, another job for the list 👍
Unfortunately not. It's definitely about 46mm major diameter, and the thread is a very good fit for 5.5tpi, I tried 4.5mm pitch, but that got bound up. There's no manufacturer markings at all on it, I think this is probably a DIY job, so who knows what it was supposed to fit.
after using centre drill we make a cut on the face around the centre drilled shaft so that the drilled face is free from any detent or damage due to handling@@ollysworkshop
Hi Olly. Very interesting to see how you overcame the thread cutting problem. Well done getting this far. A little more future fettling and it will be perfect. 👏👏👍😀
Thanks Andrew. It's definitely another tool in the armoury, but I don't fancy doing another one of those threads in a hurry!
nice one Olly
sometimes the tedious jobs are very satisfying, well done so far😉😉👍👍👍👍
atb
Kev
Thanks Kev
You will make it work. I'm sure.
Thanks Michel, I will certainly try. Just not today.
Great job thread milling! People kept telling me that wouldn’t work, I’m glad you proved it! I picked up a Sherline, was planning to use that as my driver, similar to your setup.
Thanks Dan. I saw Stefan Gotteswinter do the same thing several years ago, and the idea has been in my mind since. I may yet add some kind of reduction drive to the lathe, as I reckon, going slowly enough, using the tool post spindle, it should be possible to cut a sensible size thread in a single pass.
@@ollysworkshop same same!
Good to see you back in the workshop Olly!
Given your face plate won’t fit anything this side of the Science Museum, I think I’d have just bored it out and press fitted a suitable pin / arbor / Morse something.
But that wouldn’t have yielded a novel thread cutting technique.
Which is excellent!
I reckon single pointing would have taken quite a few passes at that scale in EN8, and there would have been much greater chance of crash damage. Though I’d wager fewer splinters in your fingers!
Looking forward to the next one. Matt
I definitely considered not going down the threading route, but I really don't like modifying things in a non-reversible way. My thinking was by making a threaded arbour I can mount it on my current machine, but it doesn't close the door on other mounting situations. Unfortunately each of those alternative situations that I've thought of all require their own threaded arbour!😫
Hi Olly. I am sure you will get it bang on in the end. Good luck.
Steve.
I will try, when a project comes along that needs it, that'll be the push to finish it off.
Interesting Olly. Necessity is the mother of invention. Cheers
Thanks Paul.👍
Where there is a will, there is a way. I have noticed that the factory machined products are no longer machined to the high standards of yesteryear. Your problem-solving skills are inspiring!
I think the out of roundness on this one is due to stresses in the cast iron. I'll measure it again when I come back to it, as it may well need another very light skim when it's had a chance to rest.
Nice face Plate-Chuck find Oly. Great video adapting it to your lathe✔👍
Thanks Al, glad you enjoyed it.
Very nice face plate.
Thanks, although the four jaws are pretty sloppy. I think I'll just remove them and use it as a plain faceplate.
Interesting approach Olly, I know the buzz is finding ways to overcome problems (which you have already done and proven with your thread now). Offer still stands mate, if you want me to knock you a threaded spindle out to your newly bored diameter, you know where I am😊. Cheers, Jon
Thanks Jon. I'll keep you in mind. That EN8 is so much harder to work with than I had imagined!
Hello Olly,
A good project, and now you have started and have a plan how to complete it I feel sure it won't be as bad as you think.
Take care.
Paul,,
Thanks Paul, your encouragement means a lot 👍
This is an interesting project
Thanks, I just need to build the motivation to finish it!
If it's only a few threads on the end of a bar, I don't bother power feeding anymore. I find it quicker and waaay less stressful to just stick a cranking handle in the other end of the spindle.
That's a great idea, would certainly be kinder on the hands than turning the chuck was!
I like it !!
Thanks!
Nice work Olly! By the way, if you're mounting it on an MT4 arbour, wouldn't you be wanting one with a drawbar? Think there might be a chance of it coming loose without one, i.e. from the side loads?
That's a good point. I found that MT4 to MT2 extension arbour on eBay for a good price, it was new old stock, so no choice of tang or drawbar unfortunately. Hopefully it's not too hard to drill out. I've had several end mills that were MT2 with a tang, some have been possible to drill out, others I've had to cut off a section and weld on a threaded sleeve. All that aside, I did wonder at one point why I didn't just adapt it to fit the flange on my lathe, but I suppose there wouldn't have been a thread to cut if I had done that....
@@ollysworkshopLooking forward to seeing how you get on Olly, it's turned in to quite the project!
Hi Olly, That first cut must have frightened the life out of you!!
Good to see your auxiliary spindle in action, what was the finish like on the thread before chasing it?
On a different subject, what is the state of play on the jet engine ignitor?
All the best!!
Hi David. The spindle works well, but it's a lot slower than I hoped. That said it was an enormous thread, and pretty hard material. It would have been a breeze in aluminium. The finish of the thread was as you would expect from a hand turned, milled part: lots of slight dents at the points where I stopped to reposition hands, and also a general pattern, probably to do with the cutter and speed of the spindle. The HSS thread tool cleaned up all the threads with a handful of passes.
The jet thing has stalled a bit due to complications with the testing facility, but it's looking like it may start moving again soon. If anything interesting happens, I'll let you know.
Was there a reason why you didn't use the back tool post and cut the thread away from the chuck in reverse, i believe you'll still end up with the normal thread. Good video though
Hi, The rear toolpost was made for the parting tool, and isn't adjustable, and I'm too lazy to shim a threading tool when I've got one ready to go in a QCTP holder! That said, it's not a bad idea to have a threading tool on the rear toolpost, although to cut away from the chuck on the rear, it would need to be the right way up, another job for the list 👍
could that be a 39x4mm thread?
Unfortunately not. It's definitely about 46mm major diameter, and the thread is a very good fit for 5.5tpi, I tried 4.5mm pitch, but that got bound up. There's no manufacturer markings at all on it, I think this is probably a DIY job, so who knows what it was supposed to fit.
You don't undercut on the face after using centre drill????
Sorry, I don't understand your question.
after using centre drill we make a cut on the face around the centre drilled shaft so that the drilled face is free from any detent or damage due to handling@@ollysworkshop
I will be boring the centre out when I finish this, it's just not finished yet.