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IndustryArena Forum > MetalWorking Machines > Daewoo/Doosan > Bought a Lynx, rigidity is a challenge right now.
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  1. #1
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    Bought a Lynx, rigidity is a challenge right now.

    I have a Lynx 220 LSYC bought to replace a Yama Seiki GLS 2000 LYS that I sold for a lot less than the lynx cost. The Lynx has a 3/4" holder package. Parting finishes are really sucking right now, grooving tools are screaming pretty good. It seems like it's not as rigid as the Yama Seiki. The Yama seiki is looking better now.

    I have a Puma 2100 SY II getting delivered tomorrow I think (that's what the sales guy said), and I'm sure it will be more rigid, but that Lynx is really disappointing- 3mm Parting finishes look torn with a Iscar Penta D40 coolant through holder and 1000PSI coolant, I have to use a 3/4" shank tool because Doosan didn't provide any 1" pockets. The most ideal pocket in the package is a 2 set screw pocket- not a wedge type pocket, (left approach) so I'm losing some rigidity to the holder style. The machine doesn't have enough travel to use a right hand approach wedge holder and reach the sub chuck- I hit overtravel soft before that happens (run out of travel), so I have to hang the 3/4" parting holder out to get over the subchuck. I'm hitting 150% spindle load during G96 parting. That seems a little alarming. If I used the wedge type I would have to hang out the tool even more and I think that would really murder the settup condition. I literally have 1" parting tools I could use but I don't have a pocket for them so I'm eating **** here.

    I'm having trouble doing normal work in the Lynx. It seems like this machine is danger close to falling into the category of machines that can't be used to make money. I have a Hurco VM10U in that category, and that's a terrible category for a machine to be in. At that point you bought it to learn the machine sucks and you may have to sell it for a loss.

    I don't know if a toolholder would solve this or if this is just the bastard child of the Doosan lineup or what.

  2. #2
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    Re: Bought a Lynx, rigidity is a challenge right now.

    We worked this out, the solution was to run a profile cut on all the jaws we ever put in the machine. This way we can run the stick parting tool .800" closer to the holder, and get the rigidity we need. It seems the parting holder for the package could be tremendously improved by making it left spindle side, with the 3/4" pocket coincident the right sub side of the tool, making it wedge type for better rigidity, and taking the coolant ball step and cutting that flat to the base of the holder. At that point the Lynx would be like every other CNC turning machine we have in that regard- not requiring a jaw turn for a rigid parting settup and operation to occur.

    We put the 3mm groove tool into a half index holder so we could shorten it up, and that got it cutting ok.

    The Lynx could also drastically benefit from a recessed pocket for long drills, and a 6" sub chuck. Our 2100SYII has such a pocket but it is only 3" deep and should be more like 6" deep for optimal versatility. We outfitted our Lynx with a 6" subchuck- we've found those to close jaws much more perpendicular (not angular like the ****ty hobby 5" B205 chuck which doesn't belong in industry CNC machine). With those 3 changes, and some puma like clearance on the sub side of the turret for a conventional main/sub reversible live tool without 2 different style tools required, the Lynx could really deliver all the value Doosan markets it as having.

    The first settup on this machine was 12 days, probably half of that was employee under-performance and the other half was relocating the part basket and chute, and figuring out how to get parting tools over a BB206 chuck and cut rigid. Figuring out the C axis brake can only be adjusted manually in the low clamp mode, and that it needs to be between 5 and 7.5 bar pressure to work properly was another development. We also had to plumb a braided line between two holes on the half index holder to get upper coolant to work in a half index mode. We're using Y axis turning and some crazier holders and that had a learning curve. The TT has an A axis, and the Lynx and 2100 a B, Also spindle address commands are different- that's confusing unneccessarily- that axis and those spindles have the same function and those values should be the same. Lots of little quirks in the Lynx. I think the Puma will be easy to work with compared.

  3. #3
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    Re: Bought a Lynx, rigidity is a challenge right now.

    We always profiled the chuck jaws on the showroom machines. It gives quite a bit of clearance.

  4. #4
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    Re: Bought a Lynx, rigidity is a challenge right now.

    It's nice not to have to do it. On the 5" chuck I don't think I would have to, but the 5" chuck is not good for a lot of parts so we need a 6" or the machine would just be completely undesirable. The jaw profile is an 8 minute operation, that can't be done with a Y turning tool, so in our case we will have to remove a tool, add a special OD tool in a single tool pocket, teach that tool an offset, run the jaw turn, and then re-mount the pocket and reteach the original offset of that pocket. That's probably 30 minutes on a settup- an hour if the guy isn't motivated.

    If they had a 1" stick tool pocket optimized for parting in the package, or market available, then we could probably get over the chuck without profiling jaws. I guess its part pro, part con, when you profile jaws you increase clearance for the tools, but when you don't need to do it, it's extra time.

    The Lynx is running pretty good on the first job, It was expensive to tool it up, and time consuming to get it settup in a clearance compatible fashion, but it's beginning to be a likeable machine. I wouldn't call it a starter machine, I think the 2100SY II will be a lot more operator friendly for shops that are learning- there aren't special 90 degree tools, or small clearances in the 2100SYII.

    The Puma 2100 SY II is kind of crazy looking on the floor. It's not bigger in floor footprint, but it's almost like they gave it a higher posture to impress people or something, we've got a 5.5foot tall settup guy looking up at the control, and the machine seems to be perched like it's on a lift kit. I'm 6'2" staring eye level with the control but it is noticeably tall. You'd need a step ladder in order to climb into the machine cabinet for maintenance. The machine casting around the main spindle is pretty big. The middle casting in back has tunnels and reminds me of a cave. It's really got some room inside the casting. The turret looks bigger than a TT1800SY turret somehow. I'm a little excited to see how the 2100SY II cuts. It took us 3 years of following the 2100SY II to have a need and a price that made sense to buy it at.

  5. #5
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    Re: Bought a Lynx, rigidity is a challenge right now.

    Yeah. I'm only 5'8" and I was always "looking up" at it too.
    I had an OD tool all by itself and I had a cycle set up to whittle the jaws down.

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