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Thread: Weiss WMD30LV conversion project

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    Default Weiss WMD30LV conversion project

    Or at least I think that's what this is. I bought this machine from TMTT on Ebay in the UK. As far as I can tell though, Weiss is the OEM for this mill.
    For more background, we were discussing the variants of this machine in this thread: Weiss Milling Machines.
    It is the larger version with the 840mm table and long X travel.

    I am planning to CNC this machine very soon, I will not be doing any manual work on it at all. I already have my converted X2 to make motor mounts etc, then the X2 will be sold on. The plan is to use 20mm ballscrews on X and Y, and possibly 25mm on the Z if there is space. I will probably add a second, removable lightweight Z axis to the side of the head to do small engraving work, using a high speed spindle.

    Here is a shot of the machine after I ripped 2 sides of the box off to check for damage. It is sitting in my garage.



    And here's one for size comparison with me standing next to it, I am 6'2".



    I was happy with the condition it was delivered in, which was very clean with no apparent surface damage. We'll see what it is like inside later. I can recommend this seller if you are in the UK, good communication even when the first delivery attempt was messed up by the courier. They showed up at my house with the machine on a truck and no way to offload it!
    I'll document the conversion process once I get going. I need to save up a bit more money before I can buy the screws, bearings etc. Also be interested to see any info from anyone else who has converted this machine.

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    Nice
    I have read the other tread and i am looking forward to follow this one.
    Happy conversion!



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    Congratulations LongRat - they look just as nice in Blue as in Warco Green

    I look forward to seeing the pics of the teardown and conversion. Just one question though - what is the advantage of 20/25mm screws over the cheaper 16mm ones? Do you get more mechanical advantage, or are they just stiffer?



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    As long as they are the same 5mm pitch, you don't get any more mechanical advantage, but the stiffness is a big plus. Especially on this machine's X axis, with the table all the way across to one side on the 840mm table length the machining forces in the X direction will be being taken by a long length of ballscrew. Both in compression and tension depending on machining direction of course. Basically I will fit the biggest screws I can fit in there, as long as they aren't out of my price range.



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    Quote Originally Posted by LongRat View Post
    As long as they are the same 5mm pitch, you don't get any more mechanical advantage, but the stiffness is a big plus. Especially on this machine's X axis, with the table all the way across to one side on the 840mm table length the machining forces in the X direction will be being taken by a long length of ballscrew. Both in compression and tension depending on machining direction of course. Basically I will fit the biggest screws I can fit in there, as long as they aren't out of my price range.
    Sounds sensible - though TBH I didn't have any trouble with 800mm long 16mm x 5mm pitch screws and 6000rpm/1.5Nm servos - well, other than trying to accelerate anything heavy is rather scary - does the machine move, or the room it's in?

    IIRC there might be issues with rotational inertia if your ballscrews get too big and heavy - but I can't remember where I read that, sorry.

    IMHO you might want to buy yourself an engine crane if you're going to have that thing in bits to do the conversion - I'd imagine the table and head are both in the order of 40kg each...



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    I'm going to borrow an engine crane tonight.
    This is just to lift the whole machine onto the stand so I can get a decent look at it from all angles. I see what you are saying about the inertia of the bigger screws, I'm not expecting the same dynamic performance I get out of my X2 though. Except in Z, which is why I am thinking about the auxiliary Z axis.



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    Hi,
    I see you "splashed the cash" on a shiny new mill - well done! TMTT were really fast and helpful when I was talking with them. Very interested to hear how you find the machine in use. I went up to Warwick ME show the other weekend to have another look at the Warco version, the SX3 by ARC (and the turnkey CNC version) plus the WABECO LF1210. Unfortunately Pro Machine Tools weren't there so I could compare the WABECO offering. Further inspection of the machine on the Warco stand has convinced me that the Weiss machine is the way to go in terms of size spindle speed cost and easy of CNC conversion, especially as you can get the longer table machine without a price penalty.
    20mm screws on X and Y would appear feasible and a good choice also agree with 25mm on the Z axis. Are you planning to use servos or steppers?



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    I'm planning to use 425oz.in NEMA 34 steppers. The X and Y leadscrews are dia 20mm as stock, so I am sure 20mm ballscrews will fit, and there seems to be plenty of space for nuts. I haven't opened up the Z yet.
    I don't know why but Pro Machine Tools don't seem to be going to many shows any more, possibly because the Wabeco machines are a bit out of most hobbyists' range. There's no doubt in my mind that the 1210 and 1410 are the best of this type of mill, but you just can't argue with £1100 for the TMTT mill - it is a bargain for what you get, and it is BIG.
    The Arc Euro machines are nicely done and reasonably priced as far as the competition goes, but are still much more expensive than a DIY conversion. I have to say I was impressed that they had 2 machines running under CNC control at Warwick. They are doing a good job at pushing the CNC cause, there were a lot of people crowded round.



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    I've got the machine craned onto the stand, and I ran the spindle bearings in a bit. The gearbox is pretty quiet. I tested the travels, X was 597mm and Y 207mm, but if you take the Z axis bellows bracket off you could get up to 238mm in Y! I'm very happy with that. I did a quick test cut in aluminium with a 2 flute 10mm carbide cutter, went through it like butter. From feel, I would say the removal rate is maybe 5 times faster than on the X2, and I expect it could have been pushed harder.



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    Have you had a chance to check how square the machine is? How easy was the lift on to the stand?

    Last edited by abfa9358; 10-22-2009 at 07:21 PM.


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    If by check, you mean read the inspection report - then yes. Otherwise, no. It is claiming to be trammed to 0.040mm in both X and Y. I'm not going to try to change the Y, I don't fancy shimming that out really. Obviously in X its pretty easy with the swivelling head. I can't remember any of the other values, but they did list table flatness, parallelism of T-slots to the X travel direction, and squareness of X to Y axis motion. All of those values were smaller than the 0.040 tram values, I remember that much.
    With a 1 ton capacity engine crane we managed to lift it onto the stand after shortening the hook chain to gain some height. I'm not going to say it was easy, because it wasn't. It wouldn't be too bad with 3 people, we did it with 2 and it would not be possible on your own. I don't have much experience working with very heavy stuff but my friend helping me has, this was a great help. He's always lifting engines out of cars and he didn't find it too bad.



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    I guess you may not have had much time to play with it yet, but how steady was it on the stand with the table or head cranked all the way out? I managed to wobble the whole machine at the Warwick show when cranking the head back down from the top, but I was hoping that was just due to the stand being on a wobbly pallet...



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