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    Resurrection of a lobotomised Maho 600T

    Yes, for the vertical axis the box ways are bolted on. In the photo linked by DeadMahoDude, the bolts are the ones where the heads are painted green.
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    Resurrection of a lobotomised Maho 600T

    After a long time (mainly due to a lot of travelling), here is the next progress report. I pulled the ram off the machine for inspection and cleaning. This is the most wear I have found so far. It's not great. Towards the front of the machine, the flaking marks are all gone and the surface is...
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    Resurrection of a lobotomised Maho 600T

    That is some interesting information, thank you. But not something I will use. There are software limits in LinuxCNC (and all other CNC controllers I would presume), which will be the first layer of protection against overtravel. Potentially, it takes the acceleration (deceleration) into account...
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    Resurrection of a lobotomised Maho 600T

    I cleaned up the x-axis ballscrew and end cover and installed them on the machine. Just for my own interest, I measured the vertical play in the x-axis slide by in turn lifting each end of the slide by a car jack. This is corresponding to the jib I measured a bit on a few posts back. I pumped...
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    Resurrection of a lobotomised Maho 600T

    A bit more progress. I started with the wiring of the cabinet. The DC power supplies and the emergency stop / reset circuit are wired up, but not much else. Today I also put the cross slide back on the saddle(?). I replaced all the copper washers for the lubrication lines. While doing that...
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    Resurrection of a lobotomised Maho 600T

    Yes, it would make sense to straighten it before evaluation or starting reconditioning. I was just having some thoughts about how to do that. Aboms video shows how to do it very well. Personally, I could use the quill (with DRO) on my toy mill as the press. Now, I have no intention of...
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    Resurrection of a lobotomised Maho 600T

    Time for an update again. I haven't quite made up my mind about the Y-axis ball screw bearings yet, but I think I will leave it as it is. The Maho spare part number is 27.069340 with description "L20 DF 030 T manufacturer-name-which-PM-doesn't-like". In this catalogue: Bearing catalogue I found...
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    Resurrection of a lobotomised Maho 600T

    One reason I opted to reuse the old angular contact bearings was that I was not sure of the exact type of bearing to use. I recall from the past that at least SKF have different variants of the angular contact bearings (I'm most familiar with SKF). It's clear to me that the bearings should be...
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    Resurrection of a lobotomised Maho 600T

    The term interpolation is maybe not all that clear or even correct. But it does hint at the function it performs. I also thought about this before putting that term on the board, but did not come up with anything better. Regarding the bearings, you are probably right ballen that it would have...
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    Resurrection of a lobotomised Maho 600T

    If you want the one sentence explanation, it's in the last paragraph of the post... I start by explaining how the linear scale works as a build up for the explanation of the interpolation. I'll leave out the index/reference mark, because it is not important for this discussion. I will also...
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    Resurrection of a lobotomised Maho 600T

    After some more travelling, I am now back home and on vacation. So hopefully there will be some more progress. I mentioned in passing that I will make my own "EXE" converters or interpolators for the Heidenhain linear scales. Last week I soldered the components to the board and tested it out...
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    Resurrection of a lobotomised Maho 600T

    I have been travelling over two months since the last post, so progress have been slow. In any case, I started cleaning the parts and put the saddle back on the machine. The parts are cleaning up nicely. I used Mirka Mirlon product with (I guess) a grit equivalent of 1000 paper, and only light...
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    Resurrection of a lobotomised Maho 600T

    Delaying powering off the servos can lead to a shorter braking distance. But that requires that the servos support it, handle it fast enough, and handles it safely. It's difficult to be confident about at least the last part with the Leadshine ELP drives I have. So yeah, maybe it's best to just...
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    Resurrection of a lobotomised Maho 600T

    While there is really not much left of the original E-stop chain, I do plan to recreate a similar one. The only thing I'm not sure of at the moment is if I want to remove the power to the servos directly, or with a small delay. With the delay, they might brake for a bit (the documentation is not...
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    Resurrection of a lobotomised Maho 600T

    Yes, I would also be inclined to think it should be assembled dry. What I did not write was that when I disassembled it, there were a significant amount of oil on all the surfaces. I believe this was because of the disintegrated ball screw seals. I fear that if I had assembled it dry, oil might...
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    Resurrection of a lobotomised Maho 600T

    The new servos I got with the machine are: X+Z (Maho): Leadshine ELM1000FM80H-SS, 3.18Nm @ 3000 rpm Y (Maho): Leadshine ELM2000EM130F-H, 7.7Nm @ 2500 rpm I got a (German) manual with the machine. The below pages are from that one. In the first you can see the "nominal" torque of the original...
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    Resurrection of a lobotomised Maho 600T

    Now the vertical axis slip clutch. I cleaned it externally and cobbled together a setup to measure the slipping torque. The manual says it should slip at 24 Nm. I measured up to 100 Nm and did not get it to slip. So I decided to take it apart, clean it internally, and readjust it. While it was...
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    Resurrection of a lobotomised Maho 600T

    It appears documentation about those Siemens servos is not so easy to find online. Based on what little information I can find, I do believe they would be a great fit for the MH600T. And of course the "donor" machine is similar in size. However, like mentioned, I will try with what I have at...
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    Resurrection of a lobotomised Maho 600T

    Thanks for the advice. I certainly have no argument regarding the importance of the oil. New metering valves do not appear to be prohibitively expensive (~500EUR for the machine). But still more than I would prefer to spend on it. I think I will try to test the function of the metering valves I...
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    Resurrection of a lobotomised Maho 600T

    Yes, I was actually checking the central lubrication system some weeks ago. To most places I got oil flow, but there were a handful locations where I didn’t get any. This was also a reason for opening up the ways. I suspect the reason is more with slightly dried up old oil on the ways and not...
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