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  1. #265
    Activation process peteeng's Avatar
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    Smile Re: Designing new Router called Maximus

    Hi All, Ta Eric - I now have a proper GA and a Bolt BOM. First nearly automatic bolt BOM I've ever done. YEH. I did the atomic BOM then hide all the none bolt items. This consolidated the bolts across the sub assemblies, something that has eluded me for a while. The test BOM went well. Now get some dwgs going and work thru the holes and check all the bolt lengths. Then we can get to R4. Round 4 will be final simulation, costing and adjusting the design to a budget (to be established) Plus need to start thinking about wiring, cable chains and terminals etc. Then Round 5 will be polishing. Get out the Silvo...

    I may have to not use configs for bolts into the future as technically every part should have a unique part number. Doing it this way they do not. So this means making a series of bolts of required lengths of different part numbers and using them. I could make it the same PN with a -55 suffix meaning its 55mm long but I try to make PN meaningless to avoid conflicts.

    Having been right thru all of this, my only design concern is the closeness of the Z axis bearing plate bearings. That's where it all started. I could put them to the side of the gantry bearings but then it would make the machine very wide. This maybe a bearing quality issue. Something to think about while the dwgs start to pile up.

    I also have been adding extra "wholes and accommodations" (as Mr Planck asked for ) to parts where I think extra bits or brackets will be needed as they are opened. Peter

    Attached Thumbnails Attached Thumbnails Designing new Router called Maximus-bolts-jpg   Designing new Router called Maximus-maximus-hd-general-arrangment-jpg   Designing new Router called Maximus-bearings-jpg   Designing new Router called Maximus-holes-jpg  

    Last edited by peteeng; 06-17-2019 at 05:01 PM.


  2. #266
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    Default Re: Designing new Router called Maximus

    Hi All- Details and more details. The drawings are starting to stack. Peter

    Attached Thumbnails Attached Thumbnails Designing new Router called Maximus-maximus-jpg  


  3. #267
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    Default Re: Designing new Router called Maximus

    Hi All Lurkers - Been away for a couple of days doing some sailing trials on a flying trimaran. Not enough wind to fly but sorted a lot of the boat. Back at the coal face. Have sorted all the assembly drawings and corrected a few part names that I used from old projects. Corrected some part/assm links and made more part dwgs. Now the assemblies are correct, I can get serious at a part level. The paper stack gets reviewed, marked up then next cycle gets corrected and reprinted. Use a lot of paper in this process. When there's no more mark ups its done. Thinking about the motor mounts on the gantry. Probably need to make these a bracket so it can be customised for different machines, I'm sure some people are going to want to use N34's or a ballscrew. So will come to that when I get to the gantry parts. Peter

    Attached Thumbnails Attached Thumbnails Designing new Router called Maximus-assm-jpg  
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    Last edited by peteeng; 06-23-2019 at 12:40 AM.


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    Default Re: Designing new Router called Maximus

    Looking good.

    I'm frequently surprised to see that people buy a quality ballscrew and then mount the stepper motor on the end using long, spindly stand-offs, seemingly unaware that twist in these will screw up the accuracy when the machine is under load. I look forward to seeing your solutions.



  5. #269
    Activation process peteeng's Avatar
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    Default Re: Designing new Router called Maximus

    Hi Zorbit - Good to know your still out there. Yes some standoffs are very spindly. I have not done any simulation on the motor mounts or returns. So this will be put on the to do list. I've just finished fixing a couple of inconsistent dwgs in the assemblies and I think I'm clear to work on the parts seriously. I organise my axes so they are wisywig to the DRO on UCCNC. The laptop will be to the side of the machine on a small ledge so the Y axis will be the transverse axis (the gantry direction) and the X axis will be the long axis, along the table. So the X axis will have a slave A axis. Just thinking ahead... Peter



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    Default Re: Designing new Router called Maximus

    On the subject of "thinking ahead", have you considered making it easier to retro-fit a toolchanger ?



  7. #271
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    Default Re: Designing new Router called Maximus

    Hi Zorbit -Haven't been involved in a tool changer before so don't know exactly what's required. At the "Maker" level ATC's would be rare I think. But if you have a bullet point list of pointers I'm happy to see where it goes. Still working on drawings....Peter



  8. #272
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    Default Re: Designing new Router called Maximus

    and then mount the stepper motor on the end using long, spindly stand-offs, seemingly unaware that twist in these will screw up the accuracy when the machine is under load
    Before the arrival of cheap chinese steppers, people used high quality components, then came with real spec sheets and technical info. These would tell you that a motor should be mounted to a solid plate, preferably aluminum if it was running hot, which would act as a heatsink.
    A stepper should NEVER be mounted on standoffs.

    Gerry

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    http://www.thecncwoodworker.com/2017.html

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    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  9. #273
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    Default Re: Designing new Router called Maximus

    Hi All - Beavering at the dwgs. Added them up, about 100 to do and I've established 19. So about 20% in. By established I mean the dwg exists and is linked into its parent in the database. Then it's easy to change and update via the part or the assembly itself. If the part changes the drawing changes. For instance just checked and changed the hole sizes on one of the bearing brackets to allow a little more clearance, the dwg updated automatically. As I'm establishing drawings I'm checking PCD's, hole sizes and alignments. I'm also noting on the dwg what's important in that part.Once the full set is established I can run through them at a detail level. Cheers Peter



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    Default Re: Designing new Router called Maximus

    Quote Originally Posted by peteeng View Post
    Hi All - Beavering at the dwgs. Added them up, about 100 to do and I've established 19. So about 20% in. By established I mean the dwg exists and is linked into its parent in the database. Then it's easy to change and update via the part or the assembly itself. If the part changes the drawing changes. For instance just checked and changed the hole sizes on one of the bearing brackets to allow a little more clearance, the dwg updated automatically. As I'm establishing drawings I'm checking PCD's, hole sizes and alignments. I'm also noting on the dwg what's important in that part.Once the full set is established I can run through them at a detail level. Cheers Peter
    Wish i was this well organised!!! Great job



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