I'm looking at buying a DMV 3016 or 4020. I was just wondering if anyone has one or even another newer daewoo mill, just want to know what you think of them, and how they compare to other mills you have ran

thanks for your input

We had the 4020's 4 of them and the spindle bearing went on all of them in less than a year.So company got rid of them and got three new mori's.

Wow....
I have heard of some spindle problems on some of the older lathes, but never on a mill. I would have to wonder what warmup routine was used, material cut, way more information. That would be one heck of a coincidence for four spindles to go on four machines in the same shop.

cutting aluminum at spindle max 24/5 and some saturdays spindles really never stop.

Jackson, we have 2 DMV 4020 Daewoo's w/ 10k spindles. We bought both mills new in 2002. We build injection molds. We do everything from roughing to hardmill finishing with both machines. We hav never had any kind of trouble with either spindle. Both machines have ceramic bearings. Often times we run at 10k for 36 to 48 hrs. straight.
About the only issues we have is the machine growth in the y axis. We just have to keep a close eye on our oil cooler settings, in order to minimize this.

Jackson we have a year old 4020 and have had no major problems with it the machine runs every day. our just seems to be air preasure sensitive.

Hope it helps
Dadeslot

hi i'am bertus

i bought a nm510(4020) 8000rpm serial:serialnm5100025 3-21-2006
an 600 ours later the main spindelbearings broke down(13mnd's)(so no more garanty)
we have a warming up prog and never had major collision

greetings bertus .nl

I have Mynx 540 same as the 4020 , have had 2 spindles in this machine with only 850 cut hours on it . It has never been crashed by us , but because of a software problem in the machine when it was beening installed . This caused the facer to go down in Z and wipe out the vise hard jaw and crack the drive dogs on the arbor .
I dont know if this caused the spindle to go out the first time some 450 hrs later . the second spindle had a pitch change with 200 hrs on it along with a oil discharge from the lower seal area

Greg

If I may ask, where are you located?

If I may ask, where are you located?

Yes you may ask...

Nelson, South Island of New Zealand.

I want to know if this is an isolated problem or if other people are experiencing the same or similar thing. :confused:

We purchased a new 4020 Daewoo 10-06 8k spindle
The first spindle came to a screeching halt at 351 hours later
Installed a new spindle chiller
Installed a new spindle
The second spindle started making noise at 950 hours
The third spindle installed at 1025 hours(The guys are still here)
We will see how long the third spindle lasts
I am no Expert only recording History
I would also like to hear from anyone else reguarding their spindle history

Even though I have had a couple of spindles go out, this is not my main gripe.

What I want to know is that those of you who have had the same problems, how have your "dealers" handled it. Has this been a positive experience, or have they given you the shaft? My guy is adament that I caused the problem and is not in the least interested in dealing with the situation.

Daewoo don't want to know about it and keep sending me back to the agent. One big calossal mess.

Have the tec installing your spindle up the time #1 up to 4400 ish(time oiler is on in milli sec.) and set timer #49 to around 25 min.(time between oilings)
Daewoo is now Doosan. Doosan is standing behind there spindles for one year regardless of machine hours.(not 2k hours like most). If you are close to your year ask your dealer to extend one more year.

How do you get Doosan to back their machines when the person at Doosan who is responsible for this part of the world won't step up to the plate and make the agent fix the problems ?
My mill left the factory with a major software problem that caused it to crash yet no one will take care of the damage this caused .The first spindle lasted 450 hours , the second one stopped with 400 on it
If any body out there who has the name of some one at Doosan who can help could you please pass it along

Thanks

Wow!!!
I'm considering either a 400mm Horizontal. I'm REALLY going to be interested in hearing how this plays out.
I have a Daewoo lathe that I am quite pleased with. But I sure have heard some fella's have problems getting things straightened out.

We have a lathe which we got 12 months after the mill, before the problems with the spindle started. It is the PUMA 240M with Live tooling. We told the dealer/agent just after we got it that the turret is out on the Y by 0.3. 15 months later and we are still waiting for it to get fixed. The live tooling motor and gear box is much louder than it should be, and needs to be replaced, and low and behold, we are still waiting for this to be replaced also.

What it looks like to us is that Doosan is selling their machines to the dealers, without warranty, hence the reluctance of our delear/agent to take care of business.

As I said earlier, if anyone can give me a name for someone at Doosan, then I would be very grateful. So far my contact there doesn't want to know me and keeps fobbing me off to the dealer. You'd think they would be concerned about their reputation and their product.

Who is your contact at Doosan that keeps fobbing you off? Where is he located?

Who is your contact at Doosan that keeps fobbing you off? Where is he located?

Christopher Choi at Doosan in Korea. He's our dealers direct point of contact in Korea. yunjoo.choi@doosan.com

Most spindles do not fail without a crash before.
I know most of you never have crashed a spindle....right?
The second problem is dealer installation of spindles.
Most dealers do not have training replacing spindles in the field.
Leaking oil and noises shortly after a replacement is a good indication of a bad replacement job.
Thanks, Good Luck

What was the software problems? A facemill crash hard enough to brake the drive dogs must have been bad. Do you have the 21i or the O control? Are you in the US?

The reason my mill crashed right out of the gate was because the G43 cancellation code G49 had been placed in the wrong line within the software for it's ez guide .This made the spindle rapid down instead of going up at the tool change. The hit it put on the vise was hard enough to crack the drive dogs and to bring the spindle to a complete stop within a 1/4 of a turn ,took out the vice hard jaw and facer .The service tech has told me more than once that he has seen spindles last up 2k hours after a hit before the go out , yet never once did he warn me that we might experience some problems down the road with the spindle . With the second spindle it started to change pitch and had oil coming out around the labyrinth seal after 200 more hours , all the dealer did was to promise to come and fix it but that never happened either
What gets under my skin the most is my problems can be traced back to the factory but they nor the agent will step up and come to the party

I'm in New Zealand and have the 21i

I'd be talking to my lawyer.

We were given a bill for the first spindle ( 5k )to this i added my costs plus the fact it was down for a week sent it back to the dealer and told them to forward it on to doosan . Three months later when we told them that the new spindle was not happy we asked about our claim ,they said that it would not be honored because we were outside the 12 month warranty .they gave me a 15k bill for the next spindle saying that my unit was unable to be rebuilt but they had one sitting on the floor that could be rebuild .When the service guy was putting it back in the machine he let slip that they found that the grease in the bearings had been contaminated ,this was backed up by a report (had told them 5 mths before about noise and oil from spindle ) To date i refuse to pay either bill and yes we are talking to our lawyer .
There is one other company down here who has had 4 or 5 spindles in the last 2yrs in their mill ,the first only lasted some 40 hours .
I only found out a couple of months back that Doosan covered the cost of the bearings used in the first spindle which backs up the view that they are being sold without a factory warranty in place.

We just put a new 4020 Box Way Doosan on the floor about 4 weeks ago. We have 3 Haas VMC's on the floor, some for over 4 years.

We needed a mill immediately for a job. Haas could not deliver one for 4 to 6 weeks. Doosan and Arthur Machinery has asked for an opportunity to get a mill on the floor for about a year. They had a mill in stock, and delivered in 4 days on a 30 day trial.

Mill came with TSC and 12K spindle. Fanuc controller.

Pros: Strong machine, box ways and an extra 4,000 lbs of iron. 30 tool ATC instead of 24 on Haas. Lots of head room under the 20" Z travel, standard 3" face mill at bottom of Z travel still has about 4 to 6 inches away from the table.

Cons: Controller is not as friendly as Haas. We are having trouble posting from MasterCam, lots of Fanuc specific G codes are being left out for can cycles (this is more of a post and MasterCam problem) Doosan has made the doors impossible to open during operations, so during setup it is impossible to get your head in the machine for visual checks (My setup guys hate this, I can understand safety, but i wish we could override the doors for setup, and them change the parameter for operations) We bought the machine to do a job off the table, standard tooling won't go low enough. This machine would be great for tall parts, but as far as near the table operations, you have to buy a sub-plate, or buy extended tool holders. The unit goes through Way Oil like it cost $.50 a gallon, we refill about every 8 to 10 hours of operation (hope the skimmer works)

We are holding off judgment for now, the guys on the floor hate the machine, but this could be a familiarity problem. Although, from my experience with the machine, I wish Fanuc would make a controller as operator friendly as Haas has made their controller.

We have a little over 300 hours on the spindle and have had little problems.

STS,

Have you had a chance to run the same part on the Daewoo that you've ran on the Haas? If so, did you find that one ran the part better than the other?

Not too many apples to apples comparisons yet.

We are taking heavier cuts on the Doosan. Specifically with a 3 inch face mill on 4340 HRA stock. Cut width 2.5 inches X .1 depth of cut. The Haas's will take this, but not very well. The Doosan takes this cut with no problem, and could probably go a little deeper

The standard "look ahead" on the Fanuc controller works well for most of our high speed aluminum solids applications. The standard Haas (not VF SS package) look ahead had to be upgraded to handle our high speed applications.

Time will tell on the Doosan. We have been extremely happy with our Haas mills (and note: you could not pay me to own a Haas turret/slant bed lathe). I think maybe 3 or 4 service calls in 4 years (and half those calls were problems or crashes we caused) We have a VF3 SS with probing, paid under 90K for it. The Doosan without probing was 20K more. The Doosan is arguably a heavier duty mill. But with our particular applications, and our view of the Haas machine operator friendliness, I wish I would have contracted out the work and waited for the delivery of the Haas mill.

Please understand, there is nothing wrong with the Doosan mill (and i admit I have had problems with our Daewoo lathes) and it is one heavy duty machine. But after running it for a month, we are having a little buyers remorse.

Programmed and ran DAewoo lathes and Mills for the past 8 years. Had a DMV 500...had a weak Y axis leading to bad finishes and vibrating that killed a few encoders. There was also a spindle motor mouting plate that contributed to the vibration. After Daewoo (before Doosan bought them out) fixed that, it was a pretty good machine. There's also 2 4020's and 2 3016's. Overall the machines were really dependable. We didn't have any serious crashes and any problems we had were either normal wear or lack of maint. Their lathes are great also. About the only complaint I have about the lathes is the live tooling heads......boy do those suck. (nuts)

Gentlemen,
I am relieved to find that others have experienced similar failures with Doosan spindles in the DMV 4020. My dealer insists that I am the only one. I am currently down, after my 3rd spindle came to the grinding halt this morning. (950 hours total) I run a 1 man operation, R&D and short production, light to moderate feeds and speeds with nothing more harsh than a couple of broken taps. No crashes. My dealer tells me that both spindle #1 and spindle #2 failed due to an "impact", according to Doosan factory. Not true. My tech suggested that my shop was broken into after hours, machine and air powered up, crashed by these mysterious vandals, then returned to its power down condition as I left it. Absurd.

I'm just glad my forklift works.

Craig

Sounds like you have the same dealer. What part of the country are you in.

I believe there is m code for temporary disabling the doors so you can stick your head in for setup purpose, from mdi set your spindle speed and start it than enter at mdi M250 and realese the doors this should allowed you to open door.

I just ordered an HP5100 with a bunch of bells and whistles as well as a Puma 2000Y turning center.
I also have a 220A lynx turning center and am pretty happy with it. I don't take delivery till late June because of moving to a new building, but I'm pretty jazzed.