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Guidance on turning in a vertical mill

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david lockwood20/05/2010 20:46:01
41 forum posts

On my mill I can loosen the column that holds the head and it is then easy to set a a piece of stock tuned to a close fitting diameter  in a slot or pre drilled hole as in the second method  for the purpose of setting the spindle accurately in the centre.  

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This all being said I would look for a cheap small lathe. I expect you would use it more then you think

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Here is a link to a youtube video of a mill converted to a lathe but I think you would need a lathe to make it as you could only turn short work in the mill due to not having tail stock support and the spindle would be to long  to  make.  http://www.youtube.com/watch?v=b2-Kdud7eiA

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 Good luck all the same no harm in trying whether it works or not.

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Terryd20/05/2010 21:19:26
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1946 forum posts
179 photos
Dear David,
 
That is a cnc milling machine, not a manual one, fitted with what looks to be a homemade equivalent of a lathe headstock.
 
What is the point?
 
How much cost for the motor, bearings, time for manufacture etc. That doesn't take into account the setting up time etc etc.  Again, what is the point when a lathe is so cheap and versatile?  Just because you can doesn't mean you should as someone said earlier.  I'm just flabbergasted at the wasted effort.
david lockwood21/05/2010 16:33:59
41 forum posts
As I mentioned I would look for a cheap small lathe. I think the reason for making the attachment  was for the pleasure of making it as it  is for everything I make.
 
The fact that it is cnc I think is not important apart from threading you could do every thing manually
 
I would go the lathe root every time and consider turning in the mill as a little eccentric but if that is what someone wants to do as a hobby then its not a wast of time if they enjoy it 
 
Respectfully David  
 
 
Ps sorry for all those face things in my ealier post i don't know why they are there 

Edited By david lockwood on 21/05/2010 16:36:02

RJKflyer30/06/2010 18:45:35
49 forum posts
3 photos
Well, I have now done what i'm afraid many here seem to consider the unachievable, or perhaps plain stupid.
 
I've more than successfully turned material accurately in my mill.
 
I made a toolholder from a piece of (scrap)  3" long 2" dia EN1A bar which i:
1. milled square,
2  milled out a 12mm square slot about one quarter way down and along one side,
3.  fitted 4 M5 socket head cap screws (to hold the tool),
4.  relieved the edge above the tool by 10 thou to allow for the torsion opening the slot slightly when the tool bit is clamped (and thus pushing it out of square), so making sure the tool holder was clamped only by the absolutely parallel material below the tool. 
 
Clamped 8mm carbide tool into the tool holder, obviously on its 'side', and then tool holder in mill vice.
 
Used laser finder to set tool cutting point to the centre. Locked y axis.
 
Held the workpiece in a appropriately-sized collet.  
 
Turned away...  Perfectly satisfactory on both z-axis (along the workpiece) and x-axis (across the dia) cuts.
 
So, am i missing something?  Yes yes i am sure that parting off might be more troublesome, and knurling will be impossible (maybe...), but i have acheived what i set out to do - use a very high quality mill to turn the occasional smallish item.
 
john swift 112/07/2010 18:11:53
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318 forum posts
183 photos
In a funny kind of way are you emulating  vertical lathes ?
 
I am watching this  thread with interest
 
at the moment I am still trying to get my head around how coil feed ESCOMATICS work 
 
Terryd12/07/2010 21:07:06
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1946 forum posts
179 photos
When will we see the YouTube videos we were promised?  As John Says it sounds like a vertical lathe, not quite like what you promised us.  I thought that it would be more like the link you posted here.
Terryd26/12/2010 14:07:33
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1946 forum posts
179 photos
Hi RKFlyer,
 
I was wondering if you had any more results to show of your turning on a milling machine.  It could make an interesting project.  A few photos or a YouTube video would be interesting
 
Seasons greetings
 
Terry
Stub Mandrel26/12/2010 17:32:38
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4318 forum posts
291 photos
1 articles
I have considered the mill as a lathe approch as a way of turning large flywheels - very, slowly of course.
 
Neil
Richard Parsons26/12/2010 21:22:22
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645 forum posts
33 photos
 

The use of a milling machine to turn things is not as daft as it sounds. In one place I worked we had a 12 foot vertical lathe which was left over from the war (Kaiser Bill’s war). For some reason we could not scrap it.

One day a job turned up that needed a set of 10 foot dia things to be machined accurately. They were BIG and the problems of getting them loaded and unloaded were great, but the price was right so that was solved hydraulically. One of the centre lathe turners learned how to use it and away we went for the next 24 months at a rate of 1 off every 2 weeks . It was a transatlantic sub-contract job so eventually the ‘account-ants’ stuffed their oars in and the machine was sold to the prime contractors at scrap prices. They paid to have the building it was in demolished and the device shipped out.

The one difference between it and a mill was that the ‘headstock' was where the milling table is. You could get round these problems but it would be cheaper to buy a nice centre lathe. One which really suits your future needs.

Edited By Richard Parsons on 26/12/2010 21:24:15

JasonB27/12/2010 08:50:07
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25215 forum posts
3105 photos
1 articles
Is this what you had in mind Stub ?
 
J
Ramon Wilson27/12/2010 09:39:59
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1655 forum posts
617 photos
Now that Jason is what you can call a setup. What originality.
 
A Cincinnati - ooh I wish
 
Regards - Ramon
Francois Meunier27/12/2010 12:12:11
30 forum posts
6 photos
Hi,
But I did that, see the pictures in the album
I had no other way to turn a flywheel too large for my lathe. The flywheel casting was first routhened out by plain milling on the RT, and finished by "turning".
I agree that it was for an one off job, but so funny...
Gedeon
 
PS : no way to insert here a direct link to an album?
John Stevenson27/12/2010 12:25:13
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5068 forum posts
3 photos
I can't see a problem with turning on a mill, it's only a metal cutting exercise after all.
 
We milled on lathes before we had funds or space for milling machines, industry has live tooling that can drill, knurl and even rotary engrave on lathes, so what's the problem.
 
Just because it doesn't fit into someone OWN personal agenda doesn't mean to say it won't be idea for another person.
 
The OP said he didn't have room for a lathe and wanted to use his mill.
now if he had said he didn't have room for a mill and wanted to use his lathe I wonder how this thread would have gone.
We are only limited by our imagination, it's just that some don't have any.
 
BTW an Escomatic works by feeding stock, in coiled wire form thru a fixed collet chuck, i.e. non rotating and the work is done by the tools that rotate in tool carriers and the infeed is controlled by cams inside the tool carriers. the carriers can move in the Z axis, longways, but usually they just plunge in with form tools. Very fast once setup.
We bought 5 off Mecanno at Liverpool when they shipped over to France and they were used for long runs of small turned parts.
 
John S.
chris stephens27/12/2010 14:41:11
1049 forum posts
1 photos
Hi Guys,
Some time ago I wanted to make a slitting saw arbour to fit my R8 mill. At the time I was fed up with the saws running out of true, so I thought I would machine the R8 arbour in the mill. My reasoning was that a lathe is something that turns the work , so that you can bring a tool into contact to cut it. So I put that arbour in the mill and a carbide tool in the vice and turned the arbour to size. Now was that milling or turning?
 
For those interested, the saw still appeared to run out of true, it seems you have to be very lucky to get a saw blade to have been sharpened  "properly", even British ones, when they were made. That being said, it works perfectly it just sounds uneven when cutting. 

I don't know for sure but my assumption is that if the saw is sharpened using the teeth as the reference, not its angular position, that one or more teeth could be slightly out. If I were to sharpen a saw I would either use a separate indexer or use the bottom of the gullet, not the tip of the tooth, for indexing. 
chriStephens
Gordon W27/12/2010 15:40:50
2011 forum posts

What's a horizontal borer then ? Mill, lathe or borer.
John Stevenson27/12/2010 15:53:11
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5068 forum posts
3 photos
Chris,
I used to have to sharpen a lot of slitting type saws when I worked in the piano industry. We had ridiculous tolerances to work to, holes to 1/2 a thou in wood and the biggest tolerance we had was on the cut up of parts with these saws which was plus or minus 2 thou, so a max of 4 thou in total.
 
Another problem was marking of the part with a high tooth on some of the painted parts, this would form in the shape of a scroll line on the side of the work as the saw retracted. If this was spotted by an inspector he'd stop the machine and shut it down until he decided the repairs were to standard.
 
Just sharpening a saw using tips or gullets would not cure this as it's all dependant on individual tooth hight. We would mount the blade on an arbor with the blade flat on to the wheel and it would be spun so the OD would be concentric with the arbor and the tips taken off slightly.
Then every alternate tooth would be ground so that the wheel threw the burr off the side. The wheel was reversed and every other tooth was done the same.
This was done on the tops and face of each tooth to the required clearance angle.
 
It's the only way to get a concentric blade.
I have watched blades being sharpened and all too often just the front face is addressed and if the amount removes isn't the same then the OD goes egg shaped.
 
John S.
chris stephens27/12/2010 16:51:45
1049 forum posts
1 photos
John, Thanks for that
That's just as I suspected.
 A case of economy over quality?
chriStephens
RJKflyer27/12/2010 18:58:28
49 forum posts
3 photos
OK folks, I will do my best to turn out my first ever YouTube video of my turning!
Stub Mandrel27/12/2010 19:36:41
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4318 forum posts
291 photos
1 articles
Jason - I was thinking of something a bit bigger than that - not!
 
Neil
RJKflyer28/12/2010 18:56:28
49 forum posts
3 photos
OK, here you go - my first ever attempt at creating and posting a video I know i said YouTube, but ended up on MobileMe...
 
http://gallery.me.com/richardjkelly#100000
 
It's 12 mins - too long i appreciate, but will work on the brevity next time...! 
 
Feedback appreciated! 

Edited By RJKflyer on 28/12/2010 20:49:13

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