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About djm

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  1. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    Here's a first look at my build of a CRS monorail. Like others, I found the original Masao Hidaka design too unstable. I've combined @LegoMonorailFan's motor-between-carriage approach and @FiliusRucilo's bogie and applied it to build a model in the style of Masao Hidaka's livery. The switches are reversed engineered of Masao Hidaka's design. The triggers and NXT program are my own doing. In a couple of weeks our LUG has a LEGO display. That will serve as a good test of whether there are any design issues. I know of one at present with the trigger which (assuming the parts arrive in time) I believe I will have addressed. Subsequent to the dsiplay I will update the trigger design document, make the program available and publish the building instructions for my monorail train. I have building instructions for the switches too but have been unable to contact Masao Hidaka to gain his permission to make those instructions available, so they will remain unavailable until I hear from Masao Hidaka. Regards, David
  2. My suggestion would be to submit details of the issue using That is what I did when I encountered issues and Trevor investigated and resolved the issues. If you supplyenough information (take a look at for an example), it will be very helpful to allow Trevor to diagnose and resolve the issue you are seeing. Regards, David
  3. As an FYI for any users of LPub3D, an update (version 2.2.1) was recently released. This release seems to have addressed issues I had been experiencing with getting LPub3D to successfully render images using "faded" parts in versions 2.1 and 2.2. It appears to have also remedied an issue related to using POV-Ray to render images and POV-Ray is now successfully working for me to render images. My installation is a Windows 7, 32 bit machine, so you may not have been experiencing the same issues. The most recent version of LPub3D is available for download at Regards, David
  4. Assuming you still have the original file, you might be able to use the "File/Export BOM" menu option. Export the BOM for the original file as an Excel spreadsheet. Export the BOM for the modified file as an Excel spreadsheet. Copy the content of one of the exported spreadsheets adjacent to the cells of the other exported spreadsheets. Some very simple comparison formulae on (a) the quantity columns and (b) the part # and colour code columns would quickly show you a summary of which parts were different (albeit without the actual location in the model). David
  5. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    I revised the physical build of the trigger track, to eliminate a bit of a bump. The revised design now looks like: The spring in the NXT touch sensor is weak enough so that the weight of the train can push the axle down but strong enough to push the axle up after the train has run over the track. Building instructions are available for downloading. I've got a preliminary NXT program written (a joint activity with my son, to improve his programming skills) which successfully makes the switch move to the appropriate position for a train inbound to the switch. It requires two trigger track sections, one for the straight through and one for the turnout. Some additions are required to the program e.g. it currently assumes the switch begins in the straight position. Once the changes have been made, I'll make the program available for download. I may scratch an itch to see if I can come up with a mechanism to enable the touch sensor to be mounted horizontally. The premise being that it will reduce the mounting height required for the track. Regards, David [Link to my previous posting containing track building instructions].
  6. Train Projects on Lego Ideas

    Steamtrains, BR01 was created on September 11th and currently is sitting on 1439 supporters. There's Steamtrains, BR93, created on Septmeber 12th currently sitting on 392 supporters. His third engine BR52 was previously identified in this post, and currently has 393 supporters. David
  7. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    @Mark Bellis has graciously given me permission to post building instructions for his design of monorail track curves and straights. There are building instructions available to download for; a curved track section a 16 stud long straight and a 32 stud long straight Regards, David [Link to the next of my posts containing building instructions]
  8. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    Hi Mark, you would be more than welcome to link to (or upload if appropriate) those building instructions should you decide to progress a LEGO Ideas project. I would sound a warning that given the number of supporters Masa Hidaka gained (~1700) when he submitted his project , that the odds of one reaching the necessary level of support appear slight. Some good train projects on LEGO Ideas struggled to get enough votes so a monorail project may face an even tougher challenge. In the meantime, we can of course continue our design postings on EuroBricks - I am currently experimenting with building a "trigger" track section. The purpose of this section (if it works!) is to allow automation of a layout using NXT bricks e.g. changing the position of a switch for an inbound train. David
  9. I think it was pulled because they forgot to include a more up-to-date ldraw.xml file. If only there was one available
  10. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    @Mark Bellis has built a 4 track switch with a single servo motor (refer to pictures within his brickshelf gallery). I don't know whether or not it is able to go from any one setting to any other (e.g. from "A" to "B" directly and from "A" to "C" directly) or whether it has to step through each one (e.g. from "A" to "B" directly and from "A" to "C" but via "B"). David
  11. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    It seems unlikely to me to be able to do this with one motor. I guess that there might be some cunning mechanical configuration where it could cycle between the three different settings using one motor but coming up with that would be way above my pay grade. David
  12. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    Fully built double switch (please pardon the parts' colour selection!). Regards, David
  13. [WIP] Lego monorails. [Custom Rail Systems (CRS)]

    This weekend I've worked on reverse engineering Masao Hidaka's monorail double switch, based on his youtube videos. I've got the substrate and gearing sorted and have created corresponding building instructions. The next step will be to add the track elements. In the meantime, here's a video showing the switch build-to-date in operation. Regards, David
  14. @LEGOFUN, open the file "%ProgramFiles%\LEGO Company\LEGO Digital Designer\ldraw.xml". Check if the first line in the file looks something like: <LDrawMapping versionMajor="1" versionMinor="7" comment="MG beta 4.32 LDD 4.3.6 Brick ver 1033"> or like <LDrawMapping versionMajor="1" versionMinor="7" comment="LDD 4.3.11 Brick ver 2670"> If it looks like the first one, you have not updated your LDraw.xml file. See the post from @SylvainLS above. When I restored the original LDD ldraw.xml file (i.e. the one that came with LDD) I see the behaviour you are experiencing i.e. missing parts. When I use the updated ldraw.xml file, the iissue you are experiencing goes away. Regards, David
  15. Yes, if you switch to LDCAD, you can still use LPub. The tools MLCAD, LPub, LDCAD, LPub3D, etc all operate on LDraw files. If you try switching from one "equivalent" tool to another (e.g. from MLCAD to LDCAD) and decide you prefer your original tool choice, you can switch back and any changes to your model made with the newer tool will be visible in the older tool. As an FYI, within LDD I created a model with just the 15070 part in and saved it as an LDraw file. I then opened the "ldr" file using LDCAD and it successully shows the same part. That would suggest the issue is related to one of configuration on your machine. Regards, David