Philo Posted November 4, 2013 Posted November 4, 2013 (edited) And as mentionned by DrJB, all movements must be driven by a single motor so that it is able to close loops. Using several motors and relying on relative speed variation (using PF or Mindstorms) would make it sensitive to battery level and friction differences in various sections of assembly. Otherwise... - What kind of pen do you use? felt tip? - Is there a good reason to tilt the pen instead of keeping it perpendicular to the paper? I should have listened to the comments in the video!!! - The turntables in version 5.2 are supposed to minimize shaking? - An idea for future improvement (take it with a grain of salt since I have not yet tried the spirograph!!!): What about a raising bar, fixed to the chassis, that would help raising and lowering the arms? the contact point between bar and arms would be in smooth area, allowing the arms to start their movement sliding on it. Hopefully that sould minimize shake at landing/take off... Edited November 4, 2013 by Philo Quote
pmichiel Posted November 4, 2013 Posted November 4, 2013 (edited) I just wanted to say I've been following this thread and I am finding his awesome. I am definitely going to try to build one of these. Edited November 4, 2013 by pmichiel Quote
freakwave Posted November 4, 2013 Posted November 4, 2013 What I am looking for is a buildable sequence, not the way to display it... Can't figure out how to build this part without bending things! I got over the point where you put the comments with just "holding a gear and pushing axles in" kind of methodology. I am trying to step the rest of the base and uploading it then Gerald Quote
DrJB Posted November 4, 2013 Posted November 4, 2013 (edited) What I am looking for is a buildable sequence, not the way to display it... Can't figure out how to build this part without bending things! The way I did it was as follows ... within LDD 1. Remove the top platter. Build that sub-assembly separately, 2. Flip the base upside down, build the bottom (that are now top) 2 layers 3. flip it back, build the gear-boxes and the whole 'front' of the machine (including gear switching mechanisms) 4. finish off the rear gears and motor area Edited November 4, 2013 by DrJB Quote
DrJB Posted November 4, 2013 Posted November 4, 2013 These are memorizing to watch! Memorizing for sure (you'll remember them for a while) ... though I'd qualify them as 'mezmerizing' .... i.e., magic :) Quote
Blakbird Posted November 4, 2013 Author Posted November 4, 2013 I have sorted through the plotter table,you can find the files below. I did not add any buffer commands to any of the files,but did step the main file. I will not get any more time until the end of next week to look at doing another one,so feel free to carry on with out me. I tried to import your platter back into the model, but you seem to have rotated the whole assembly in space so it doesn't fit any more. Quote
DrJB Posted November 4, 2013 Posted November 4, 2013 Guys ... what is this discussion really about? The model is fully/ready in LDD. I'm curious, this ongoing team activity is for ...? Quote
Philo Posted November 4, 2013 Posted November 4, 2013 I'm curious, this ongoing team activity is for ...? Create true (= more usable than LDD ones!) building instructions! Quote
DrJB Posted November 4, 2013 Posted November 4, 2013 ok, thank you Philo ... seems I went with the 'difficult' way. Quote
Alasdair Ryan Posted November 4, 2013 Posted November 4, 2013 I tried to import your platter back into the model, but you seem to have rotated the whole assembly in space so it doesn't fit any more. Oh bother,I will take a look now.... Quote
PG52 Posted November 4, 2013 Posted November 4, 2013 Thanks to all ! I don't have a lot of time, I'll answer rapidely... -I don't like using two motors when I can use only one, and the "magic" side would be lost -Sorry DrJB, I turned my post bad (well, my English needs some improvements...), I didn't want to say that you thought my design was bad, I was just interested in seing what improvements you added :) Because when we design a MOC, after a lot of hours spent on, it becomes quite difficult to see what is bad, what can be a problem, can be improved. I saw your modifs, that's very good but maybe it can add friction (if you can build it, you will be able to see if, mine is out since i've began the 5th version) -@Philo : I use a classic BIC for the drawings, a felt tip (feutre ?) would be far too large :) Yes exactly, it improves the stability of the arms ompared to the 5th version (see the drawings page 1, the last one is much more fluid) Your idea for raising and lowering the arms is interesting, I thought to something automatic which would transfer the movement of the board to this type of raising bar when the board has made a complete rotation. But the precision would be a disaster ; to make something manual is a good idea ! Considered for the 6th :) It's really nice of you all to work on real instructions, really thanks... :D Quote
freakwave Posted November 4, 2013 Posted November 4, 2013 I uploaded a stepped base that makes assembly possible in the given steps (only around 60 something the 8L axle with stop needs to be added later, after the gears connect the front-gearbox to the base) It is here Feedback welcome! Quote
DrJB Posted November 4, 2013 Posted November 4, 2013 Because when we design a MOC, after a lot of hours spent on, it becomes quite difficult to see what is bad, what can be a problem, can be improved. What is really 'deceptive' in great MOCS (such as your spirographe) is that the final product does not do justice to the countless hours spent builiding/optimizing it. It must have taken tens of hours of trial and error to come up with a functional/clean/compact assembly. The final product rarely gives an appeciation of all the hard work behind it. Great piece again ... can't wait for your next iteration. Quote
Blakbird Posted November 5, 2013 Author Posted November 5, 2013 I uploaded a stepped base that makes assembly possible in the given steps (only around 60 something the 8L axle with stop needs to be added later, after the gears connect the front-gearbox to the base) Thanks Freakwave! I looked through your steps and make a couple of minor changes to gears that were installed in an order that would be difficult to access. I think it is all buildable now. I have updated the master file on Bricksafe with all the latest additions. The only submodel yet to be stepped is "Table". Quote
Blakbird Posted November 5, 2013 Author Posted November 5, 2013 Yes. I'm referring to the turntable assembly which supports the platter. The submodel is named "table". Quote
freakwave Posted November 5, 2013 Posted November 5, 2013 Table base is done! Complete MPD based on Eric's last update from Bricksafe. Changes only in "table.ldr" submodel. The supports for the table should better be in the "base.ldr" as they cannot be mounted when the base is done (especially the two bent liftarms) Gerald Quote
Philo Posted November 5, 2013 Posted November 5, 2013 The supports for the table should better be in the "base.ldr" as they cannot be mounted when the base is done (especially the two bent liftarms)Yes, I noticed that too. Actually I think that motor assembly can be separated from base and attached to it in a final step. Table support could then be merged with this motor assembly. Quote
freakwave Posted November 5, 2013 Posted November 5, 2013 (edited) Yes, I noticed that too. Actually I think that motor assembly can be separated from base and attached to it in a final step. Table support could then be merged with this motor assembly. You are right, separating the motor is even better. This requires a slight redesign in order not to attach the support for the drive that goes nearly straight from the motor to the gearbox to the motor support itself. Edit: Just extracting the motor assemly Edited November 5, 2013 by freakwave Quote
Alasdair Ryan Posted November 6, 2013 Posted November 6, 2013 (edited) I don't have much time until the end of the week to rebuild the top of the table. I did have a few goes at stepping it but every time I imported sub parts into the model it off set that part a couple of degrees which meant it would not fit. Autocad would not have this kind of problem,If any one wants to do this one fire ahead... Edited November 6, 2013 by Alasdair Ryan Quote
freakwave Posted November 6, 2013 Posted November 6, 2013 V3 added Changes: - Moved the base to the main file - extracted the motor base as recommended by Philo - to extract the motor the central drive support needed to move. I have added this in YELLOW. - the old one is still there, however hidden in WHITE - moved the table base to the motor assembly for a better order of building without bending - rearranged the steps in the base to allow a better view for the assembly of the control arms - table support is stepped Open. - Control panel stepping - beautiful LPUB magic :-) feedback welcome! Quote
Alasdair Ryan Posted November 6, 2013 Posted November 6, 2013 (edited) Looks good,there is a rotation step missing on page 162 which i should of done. Did someone get my table fitted? Edited November 6, 2013 by Alasdair Ryan Quote
Philo Posted November 6, 2013 Posted November 6, 2013 Overall it looks good (I'll try to have a closer look later). The thing that bothers me is the axle8 with stop (in the base at step 51 and 57) that need to be pushed through a lot of bushes - imho pretty hard to do and require a lot of force. OK, it's buildable, but I don't like this. PG52, do you have any hint about the building method you used there? Quote
Alasdair Ryan Posted November 6, 2013 Posted November 6, 2013 (edited) Overall it looks good (I'll try to have a closer look later). The thing that bothers me is the axle8 with stop (in the base at step 51 and 57) that need to be pushed through a lot of bushes - imho pretty hard to do and require a lot of force. OK, it's buildable, but I don't like this. PG52, do you have any hint about the building method you used there? I think if you could move the 3 axle with stud to another place you could have the axle 8 and all the connecters as one sub step (right hand side). Edited November 6, 2013 by Alasdair Ryan Quote
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