Curiouser and curiouser ? Just a thought , which might help , or not . My old lathe ( Hercus Australian copy of a South Bend lathe ) mounting instructions mention leaving the tailstock end mounting bolts a bit loose . Another thought might be if the sunlight is shining through the window and warming up part of the lathe. Stay tuned for other daft ideas from me .😅 Good luck !
@ginner43
2 ай бұрын
I was almost at the point of changing the lathes orientation, just in case the earths rotation was causing an issue. Keep the suggestions coming.
@dungspreader
2 ай бұрын
@@ginner43 . It's always best to do your machining when the moon is waxing rather than waning .
@theangelshomestead4132
2 ай бұрын
Enjoy your vids. I thought maybe its just because you didnt use tail support? So the end further from the chuck moved alitls bit and "run away" from the cutter?
@ginner43
2 ай бұрын
I tried with tail support, it didn't make it through the edit. The video would have bean hours long if I put in the full process. Thank you for commenting.
@shuntawolf
2 ай бұрын
Look for a South Bend Heavy 10L with a taper (don't kill me, I know you're fed up with tapers at the moment HAHA) attachment. They're about the same foot print as that one, and have a lot more features... Here in the USA they're also called a "gunsmiths lathe"... Love mine, they have a cabinet that is a part of it and they're a great little lathe for small projects... I'd suggest getting some longer stock, and give the many vids on here a view about how to straighten out a lathe, You really want to do it over 12-18" or so, even though you're actually turning on only the beginning and ending few inches. You basically machine out the middle and make a "dog bone" looking piece then take your measurements. With a "normal??" lathe where you have a ladder between ends rather than a pipe, it's easy to twist them (easier anyway). I have to wonder if YOUR'S doesn't have more than those two screws you've shown so that the pipe actually pivots in the hole it goes through on each end???? Think of the gearbox end being the pivot point, having two or more opposing screws to adjust (think like a 4 jaw chuck here), and that you'd loosen the tailstock bolts so it 'swings' front to back as you adjust the screws..... To me that'd be the ONLY way to make it pivot laterally front to back to adjust how the carriage meets the work.... Best of luck mate... and greetings from North Carolina USA
@ginner43
2 ай бұрын
Thank you for commenting. I normally check the alignment with what ever scrap round bar I have kicking about, waste the centre and so on. As regard replacing the lathe will look into your suggestion, but I have my heart set on getting a Colchester student. If I can find a good one that's relatively local.
@wibblywobblyidiotvision
2 ай бұрын
That's a nice lathe, what make / model is it? A short term fix to get your parts out might be to use the compound. Long term, thought, it's a bit of a long process, made longer by what pears to be a cylindrical bed. First step has to be to level the bed. Clean everything meticulously, and with a machinist's level placed on the cross slide you should be able to pack under the feet to dial any wind out of the bed. Don't know how the cross slide stays level, but wear in the bed can possibly be accounted for by rotating the bed a little bit. Next up is headstock alignment, Rollie's Dad's Method will help you with that. Then you can check tailstock alignment, dial indicator on the chuck and dead centre in the tailstock. At that point, with a couple of centres nd a piece of ground bar, you should be able to assess the state of the bed.
@ginner43
2 ай бұрын
That would get me by, good idea. There is a good chance I will get fixated on the problem and nothing else will get done until it is right. Trying very hard to avoid falling down this rabbit hole.
@chrislee7817
2 ай бұрын
My old lathe is a Hardinge 😊 a joy to use.
@ginner43
2 ай бұрын
Is that a US manufacturer?
@chrislee7817
2 ай бұрын
@@ginner43 both USA and UK. A war time thing I think.
@Workshopfriend
2 ай бұрын
I used to have a Drummond round bed (long bed version) like yours. I remember that I also had problems with it not cutting parallel. With mine I figured it was wear of the slot underneath the bed which stops the bed rotating. I seem to remember 1/2 thou of wear of the slot results at least 2 thou of movement at centre height ie 4 thou change on diameter of the work.
@ginner43
2 ай бұрын
That sounds about right.
@dannykimble7671
Ай бұрын
Love your content, keep it simple no bullshit so we can understand, real world stuff.
@ginner43
Ай бұрын
Thank you.
@grahammctygue724
2 ай бұрын
Reminds me of pattern makers horizon tal boring rig thanks for showing us your darling 🎉🎉😊😊
@ginner43
2 ай бұрын
You’re welcome 😊
@frankboff8185
2 ай бұрын
Good video, and fast becoming one of my favourite channels.
@ginner43
2 ай бұрын
Thank you. I'll try and keep it up.
@chrislee7817
2 ай бұрын
Buy a better lathe. ❤
@ginner43
2 ай бұрын
That sounds like a good idea
@ShaneG33
2 ай бұрын
Have you checked for twist in the bed? As in the bed slot has a very slight turn relative to the centre axis. You should have seen it with the shim test but that might be moving your centre if yu follow me? The taper youre creating seems like the carriage is spinning around the bed towards the chuck, not what you expect if cutting force was to push the tool away so very strange. The dial gauge test you did was very telling, seeing as it went down both times I would expect that means the carriage spun ever so slightly; when you setup the dial gauge on centre of the rod, then your travelled a few inches and observed it drop, did you check if it was still on centre after travelling? Basically you might have twisted the bed longitudinally, this twist is causing the cutes to climb into the part and explains why the rod test always fell. If you have any precision ground rod, maybe a long endmill or reamer, then try that test again maybe? Very interesting problem, would love to be there and have a go finding it myself 😅
@ginner43
2 ай бұрын
The time I spent shimming the tail end of the bed was to try and correct any twist. I have wasted all the free time I had over the last week trying to correct the run out. Turns out the lathe is just a little too tired. I can't correct for all the different bits of wear at the same time. Thank you for commenting.
@VinceJones-uj3cm
2 ай бұрын
Mind boggling. My lathe is ancient, so mainly used for spacers and slugs, but I wouldn't want to be without it. Great channel, really enjoy it. Thanks.
Пікірлер: 27