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Wanted: Metal Lathe

Well here it says it only has 15hp spindle - http://www.greasymachines.com/warehouse/Catalog/Listing/1584

26 Kw would suggest 30hp spindle - or am I getting something wrong?

Currently I can start 10hp lathe cold set at top speed of 1600rpm without any issues. For the record the CX089 could not start at half speed (700) when cold - breaker on the motor went - to keep it connected to original thread.

Wouldn't CNC machine with 15hp spindle be similar to 15hp manual lathe except that the CNC uses motor speed to control spindle speed vs. gears?

Also the 15hp is the max rating so its not like its going to take all 15hp on say a light cut. I think the large HP in CNC machines are due to low torque at low speed forcing bigger motors & actually 15hp is small for 8000 lbs machine.

Did I get all of this right?

The CNC also needs some power for auxiliary motors and controller from single phase - but these are marginal loads AFAIK.
 
I was just pointing out that 3 phase converters used to balance out the power legs can get expensive.
 
Tom Kitta said:
Well here it says it only has 15hp spindle - http://www.greasymachines.com/warehouse/Catalog/Listing/1584

26 Kw would suggest 30hp spindle - or am I getting something wrong?

Currently I can start 10hp lathe cold set at top speed of 1600rpm without any issues. For the record the CX089 could not start at half speed (700) when cold - breaker on the motor went - to keep it connected to original thread.

Wouldn't CNC machine with 15hp spindle be similar to 15hp manual lathe except that the CNC uses motor speed to control spindle speed vs. gears?

Also the 15hp is the max rating so its not like its going to take all 15hp on say a light cut. I think the large HP in CNC machines are due to low torque at low speed forcing bigger motors & actually 15hp is small for 8000 lbs machine.

Did I get all of this right?

The CNC also needs some power for auxiliary motors and controller from single phase - but these are marginal loads AFAIK.
Click to expand...


This is what I think I know :)
Hope this help add to the understanding on it

- Amperage is what makes breakers trip.
- An electric motor will fight to stay at speed. Meaning the more you slow the shaft, the more amp it will eat trying to get back up to speed
- An electric motor can draw up to 400% more amps during startup (big heavy ones, or if you have a large mass in the chuck it takes more time to spin it up to speed and will be drawing in more power till it is up to speed. This is called "in-rush")
- HP is a measure of force. More force means harder to slow down (In this case the motor shaft, means less spike in amps)


So 15hp is 15hp, that is the force being applied. What changes is if you take a cut that requires more HP, it will slow the motor down, the motor will then try compensate by consuming more amperage which in turn will let the smoke out or trip breakers.
 
Hey All,
I have a confession to make to you guys.

I told you all that you can share the joy of spending my money on a new lathe..... this is not going to happen anymore......

I selfishly worked through my holidays, worked a second job, sold some of my things and purchased a "new to me" 12x36" lathe. YEEEHAWWW!

Thanks to the people that gave advice and thanks to this website as I purchased JohnW lathe that he had up for sale. (Is there a transaction rating system on this website? also can I edit the title of this thread somehow to say which posts gives the update?)

I just moved the unit yesterday to my office where it will sit until I get a chance to fabricate a stand for it. After that I need to take it apart and move it to my house down into my basement. (Looking forward to that part ;P ) Then I can learn how to break parts :)
 
Pictures or it didn't happen LOL.

Was this machine listed for sale on this forum somewhere?
 
YYCHobbyMachinist said:
Pictures or it didn't happen LOL.

Was this machine listed for sale on this forum somewhere?
Click to expand...

I already started to take it apart. Hope to fabricate a new stand for it soon. So, as soon as I have it done and in my basement I will take some new pictures of it and brag some more :)

It was purchased off this site though.
Here is a picture from the original AD. Like I said though I will post a new picture after the "Drunk touch"
(I know some of you will recognize it)

force-gl-300cx914-jpg.3345
 
If you bought it new most "As shipped" weights are around 1000lbs
But I would guess 800
Im slowly stripping parts off it and moving it home myself but I will still be stuck with the headstock/bed to move which is going to suck :)
 
TheLocalDrunk said:
Thank you, Im giddy
Click to expand...

They are FUN! When I took my machine home I stopped at MSM with the machine in the back of the truck still and picked up some bar stock to try out. I was making chips before dinner was on the table LOL.

The learning is endless with these things. Hours and hours of pure entertainment.
 
Tom O said:
So have you thought about how to get it downstairs?
Click to expand...

Sigh
Weighing my options now. Once I have it stripped down to just the headstock and bed I will gauge how to move it. A few have said to just put plywood on the stairs and belay it down. Once of my machinist friends had the same lathe and he said he removed the headstock from the bed and it made it a two person job instead of 4 to 6.

Im worried that even if I got it down the stairs with the headstock still attached we will still need to pick it up high enough to put it on the new table. (And I have a corner to navigate which could be a PITA with the headstock on also). I think I need to remove the headstock.... or hire movers with stronger backs then my own.
 
Every time I strip some parts off this thing I am thinking "Damn that was heavy" and "That should have lightened it up a bit" only to cry when I check the weight. (Me and a co-worker can pickup the heavy side now, but with a lot of effort)
 
YYCHobbyMachinist said:
They are FUN! When I took my machine home I stopped at MSM with the machine in the back of the truck still and picked up some bar stock to try out. I was making chips before dinner was on the table LOL.

The learning is endless with these things. Hours and hours of pure entertainment.
Click to expand...

I am the same way. When I got my mill I didnt have any stock so I just sat there and stared at it for a while drinking some beer :)
For this one, once it is installed and running, I WILL be making chips :)
Well, chips or broken tools.
Either way
it will be glorious
 
Do you have a basement window that it would pass through thus eliminating the trip down the stairs?
 
You could borrow my shop crane to put it on a table. Recently brought back to top shape, thanks to Janger!
 
Dabbler said:
You could borrow my shop crane to put it on a table. Recently brought back to top shape, thanks to Janger!
Click to expand...

Ohhhh is it like an engine hoist? I was thinking that one of those could be useful if we move it with the headstock attached. Does it fold up for easy transport? (And transport down the stairs?)
 
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