Oh yeah thats how to lift it

[Keith 66]

I had a Bantam 2000, that one had been lifted by the chuck. I owned it for two years & it was noisy & not accurate, I got shot of it to a dealer (Nobila) lost a fair bit but was glad to see the back of it. A week later it was up for sale with POA after the photo.
New headstock bearings were over 400 quid a pop with vat, How much are Triumph bearings????

 

[Screwdriver]

Here's an article on cutting force: https://upcommons.upc.edu/bitstream/handle/2117/120507/Cutting forces in turning operations_MartinSergi.pdf?sequence=1&isAllowed=y

If you skip right to the last page, the biggest number is ~1500N tangential force one assumes being resisted by the headstock bearing.

That's equivalent to a mere 150kg of dead weight.

My seat of the pants guesstimate is that lifting a large lathe by its headstock is the equivalent of ten times the maximum cutting force you could apply.

Another way to look at the situation is to consider whether or not you'd be happy to hang half the weight of a lathe off the tip of it's cutting tool. Probably not...

 

[pressbrake1]

Here's an article on cutting force: https://upcommons.upc.edu/bitstream/handle/2117/120507/Cutting forces in turning operations_MartinSergi.pdf?sequence=1&isAllowed=y

If you skip right to the last page, the biggest number is ~1500N tangential force one assumes being resisted by the headstock bearing.

That's equivalent to a mere 150kg of dead weight.

My seat of the pants guesstimate is that lifting a large lathe by its headstock is the equivalent of ten times the maximum cutting force you could apply.

Another way to look at the situation is to consider whether or not you'd be happy to hang half the weight of a lathe off the tip of it's cutting tool. Probably not...

The haven’t taken in account leverage, material hp etc to come up with the figures.
Easily get enough force to get bend on the top slide strain and move a tool post with only one bolt
If you can get some bend going in 3” en19 theres some force
They have given traverse force and not taken in account the force applied by torque.
Think about threading 3” pipe with a hand stock , hard work with a big bar whilst on the same job the lathe doesn’t even come under load
Even a tiny lathe like a triumph can have a 500kg workpiece

 

[Screwdriver]

The haven’t taken in account leverage, material hp etc to come up with the figures.
Easily get enough force to get bend on the top slide strain and move a tool post with only one bolt
If you can get some bend going in 3” en19 theres some force
They have given traverse force and not taken in account the force applied by torque.
Think about threading 3” pipe with a hand stock , hard work with a big bar whilst on the same job the lathe doesn’t even come under load
Even a tiny lathe like a triumph can have a 500kg workpiece

500kg (5000N) does sound a lot more sensible and tbh, I can't quite get my head around exactly how those figures in the article relate to tool pressure. Whether or not the article "takes into account" leverage, material, hp etc. I am less sure about. Seems like this chap does know what he's talking about so it's just a question of figuring out exactly what he is saying. I am assuming peak pressure at the tool tip is resisted by the headstock bearing and I'm not entirely sure if that is strictly true either. Seems reasonable tho.

 

[pressbrake1]

I think he’s calculated tool entry pressure exerted by the rack not tool point cut pressure
Force has to go somewhere and if ive got a 20hp straining the circuit breaker theres some force involved.
If it was just 1500n of force a 500w motor would be enough

 

[fizzy]

The haven’t taken in account leverage, material hp etc to come up with the figures.
Easily get enough force to get bend on the top slide strain and move a tool post with only one bolt
If you can get some bend going in 3” en19 theres some force
They have given traverse force and not taken in account the force applied by torque.
Think about threading 3” pipe with a hand stock , hard work with a big bar whilst on the same job the lathe doesn’t even come under load
Even a tiny lathe like a triumph can have a 500kg workpiece

A 500kg job rotating a bit off centre can easily cause the lathe to jump around.
Just compare the size of lathe spindle bearings to those of a car.
The car carries a lot of weight and hitting a pothole at 70mph must be a massive force.
So lifting a lathe gently by the chuck probably isn't the end of the World.

 

[WorkshopChris]

I am pretty sure this is not how to do it ..

That's fine it won't do it any permanent damage, the slings are very skillfully placed so any possible misalignment in the headstock is also replicated in the tailstock. The problems come when you just lift by one, not both.

 

[Screwdriver]

Wait what! I assumed the 500Kg "workpiece" was a reference to tool pressure, not the actual weight of the part!

People are turning half ton workpieces? On a "tiny" lathe?? That's the equivalent of half a dozen full size anvils!

I don't believe it...

<damn> A quick Google suggests a 500Kg part is actually a fair bit smaller than I had expected. Goodness knows how you get it up there tho. A solid chunk of metal 15" swing and 50" long would be 4.5 tons. Not that you'd ever do it but that's an eye opener for me.

 

[fizzy]

Wait what! I assumed the 500Kg "workpiece" was a reference to tool pressure, not the actual weight of the part!

People are turning half ton workpieces? On a "tiny" lathe?? That's the equivalent of half a dozen full size anvils!

I don't believe it...

<damn> A quick Google suggests a 500Kg part is actually a fair bit smaller than I had expected. Goodness knows how you get it up there tho. A solid chunk of metal 15" swing and 50" long would be 4.5 tons. Not that you'd ever do it but that's an eye opener for me.

The Triumph is quite a big lathe really. Will turn 24" diameter in the gap!
Even the 4 jaw chuck on it's own weighs about 60kg!

 

[Maker]

Goodness knows how you get it up there tho.

With a crane. In some of Abom79's (older ) videos he turns shafts far bigger than half a tonne, moving it between lathe/mill/borer with an overhead gantry.

 

[fizzy]

 

[Screwdriver]

With a crane. In some of Abom79's (older ) videos he turns shafts far bigger than half a tonne, moving it between lathe/mill/borer with an overhead gantry.

Yes I have watched all his videos. Those were the days, he does a lot less interesting stuff now.

It amazes me that his former company didn’t capitalise on Adams fame. Rather than concentrate on machining, they could have been a company that machines parts with free worldwide advertising. Pretty sure a global audience would have brought work in “just because”. Or they could have offered him a “deal” where he carries on working there on some sort of profit sharing basis.

seems they both threw the baby out with the bath water.

 

[Screwdriver]

17" x 9" 4" bore = 858 cubic inches or 111 kg.

Meh.

 

[pressbrake1]

Ive done many jobs that require two forklifts to load the job

 

[500e]

Don't know which one you would regret first @ronan

Yes, i got it free out of my old job. I wuz robbed . Seriously though they are the Austin Allegro of lathes, one of the first things i would do if i came into money is buy a new lathe, then a Rolls Royce cullinan and a 20 year old lingerie model with a pneumatic chest.

 

[pressbrake1]

Yes I have watched all his videos. Those were the days, he does a lot less interesting stuff now.

It amazes me that his former company didn’t capitalise on Adams fame. Rather than concentrate on machining, they could have been a company that machines parts with free worldwide advertising. Pretty sure a global audience would have brought work in “just because”. Or they could have offered him a “deal” where he carries on working there on some sort of profit sharing basis.

seems they both threw the baby out with the bath water.

I reckon he left because he’s making enough patron and advertising money to give up work and eat and holiday
I think he thinks hes become a personality .
His videos become popular because of real world medium sized machining and machines but now he does average home tinkering videos and workshop visits to make up footage
Silly boy

 

[pressbrake1]

I quite like Colchester lathes.
Very useful machines.
Ive got two Holbrook lathes, beautiful but not particularly useful compared to my mastiff with decent speed range big spindle bore full met imp screw cutting.
Ok undersized clutch’s

 

[knighty]

I reckon he left because he’s making enough patron and advertising money to give up work and eat and holiday
I think he thinks hes become a personality .
His videos become popular because of real world medium sized machining and machines but now he does average home tinkering videos and workshop visits to make up footage
Silly boy

this x 100

if I'm watching youtube videos I want to see skills/techniques that teach me something, or that I admire... even if they're skills I'll never use it's good to see someone who really knows their stuff, who can explain how and why they do things they way they do, especially when it's the kind of thing you're not really taught or won;t read about, the kind of detail you only really get from someone who knows their stuff and has been doing it a long time

a lot of youtube channels seam to go to pot after a while, not sure if the popularity goes to their heads or if they're trying to appeal to a larger audience

 

[Screwdriver]

Yeah, Adam had a good thing going and did become YouTube gold. But when he turned his back on the interesting machine work that made his videos compelling; that's what I mean by throwing out the baby with the bathwater.

Some company or other gave him a massive drill-on-a-swing-arm sort of thing. Looks more like a massive waste of space.

 

[ronan]

Yeah, Adam had a good thing going and did become YouTube gold. But when he turned his back on the interesting machine work that made his videos compelling; that's what I mean by throwing out the baby with the bathwater.

Some company or other gave him a massive drill-on-a-swing-arm sort of thing. Looks more like a massive waste of space.

Radial arm drill ?

I used to follow his channel when he was at work, but gave up when he stopped doing that and worked from home.