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woofy

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Posts posted by woofy

    HAPPY CHRISTMAS MY ULTIMAKER FRIENDS :)

    in Coffee corner

    Posted

    From Woofy ("the wishor") to everyone ("hereinafter called the wishees"):

    Please accept without obligation, explicit or implicit, my best wishes for an environmentally conscious, socially responsible, politically correct, low stress, non-addictive, gender neutral, celebration of the winter solstice holiday, practiced within the most enjoyable traditions of the religious persuasion or secular practice of your choice, with respect for the religious/secular persuasions and/or traditions of others, or their choice not to practice religious or secular traditions.

    Please also accept, under aforesaid waiver of obligation on your part, our best wishes for a financially successful, personally fulfilling and medically uncomplicated recognition of the onset of this calendar year of the Common Era, but with due respect for the calendars of all cultures or sects, and for the race, creed, colour, age, physical ability, religious faith, choice of computer platform or dietary preference of the wishee.

    By accepting this greeting you acknowledge that:

    This greeting is subject to further clarification or withdrawal at the wishor's discretion.

    This greeting is freely transferable provided that no alteration shall be made to the original greeting and that the proprietary rights of the wishor are acknowledged.

    This greeting implies no warranty on the part of the wishor to fulfill these wishes, nor any ability of the wishor to do so, merely a beneficent hope on the part of the wishor that they in fact occur.

    This greeting may not be enforceable in certain jurisdictions and/or the restrictions herein may not be binding upon certain wishees in certain jurisdictions and is revocable at the sole discretion of the wishors.

    This greeting is warranted to perform as reasonably may be expected within the usual application of good tidings, for a period of one year or until the issuance of a subsequent holiday greeting, whichever comes first.

    The wishor warrants this greeting only for the limited replacement of this wish or issuance of a new wish at the sole discretion of the wishor.

    Any references in this greeting to "the Lord", "Father Christmas", "Our Saviour", or any other festive figures, whether actual or fictitious, dead or alive, shall not imply any endorsement by or from them in respect of this greeting, and all proprietary rights in any referenced third party names and images are hereby acknowledged.

    :p:D

     

    Post your latest print!

    in What have you made

    Posted

    A year on, and the UM2 continues to impress me.

    I started a print today with very little hope that it would succeed. It's a leg for my quadcopter. At 170mm tall and 10mm at the toe, stability was going to be an issue. Near the top is a lip which needs to be well formed so the leg cannot be printed the other way up, which would be more natural, Also at the lip, the leg is sealed and as I wanted this as light a possible I turned all support off which means the UM2 would have to print in free space to cover it.

    So with little hope I came back 3 hrs later and - Whoopie - Impressed.

    leg3a.jpg

    leg3b.jpg

     

    Let’s design a multirotor together.

    in Coffee corner

    Posted

    Wow, lucky you. I don't think there are any multirotor meets near where I live (Norfolk/Suffolk border - uk).

    My 2nd generation quad (posts #164, #173 above) decided to pick a fight with an innocent unarmed tree the other day.

    Tree 1 - Quad 0

    Now retired with a broken arm.

    Design of generation 3 is well under way though, and will also include FPV this time.

     

    Let’s design a multirotor together.

    in Coffee corner

    Posted

    1322g is heavier than I'd expected but I can see it now with the photo. Mine is 1.4kg and I've yet to fit the camera and gimble.

    The apm has a pid autotune feature. If you can get it to hover in Alt. hold mode, maybe you can use that to do the fine tuning.

    If you are using the compass in the GPS module and if it's the same as mine (the hobbyking kit) then you might want to check the direction, it looks to be around 45 degrees CW from where it should be for north to be the forward direction.

    I like where you have the gimble, and that you have made your own. I have this controller winging their way from hongkong at the moment.

    Here's a peek at the inside showing my sprung apm mount and gps orientation.

    quad11.jpg

     

    Let’s design a multirotor together.

    in Coffee corner

    Posted

    @gr5

    What is the take off weight of your quad? From the motors you listed a few posts ago it looks as if you have over 3.5kg of thrust available. From what I've read, a quads thrust should be double its weight so a 1.5kg quad would be about correct. If its much lighter than that it could give stability problems for being over powered.

    Do you have a photo in ready to fly condition?

    My 1st quad had a similar sprung flight controller mount. I've had quite a few iterations of this and I think its firm and stable enough now. I'll try to get a flight video together over the weekend - weather permitting. By the way, there's no PLA in it. It's 100% ABS and mostly weld bonded with acetone. Only the dome and legs are screwed on.

    @drayson

    I've had this too and wrecked a few props on this. Some things I'd check:

    Make sure your flight controller is set to the correct configuration, quads can be + X or H shaped, it matters to the controller. Make sure the motors rotate in the correct direction, Make sure the controller is facing the correct direction and the ESC's are plugged in to the correct position on the controller. You should also ensure your ESC's are calibrated otherwise some will start before others and the quad can flip before the controller PID's can compensate.

    Please show us a photo and maybe a parts list for your quad.

    Who else is working on a multicopter - any hexcopters in the works?

     

    Let’s design a multirotor together.

    in Coffee corner

    Posted

    My 1st quad has now been retired after have one crash too many :sad:

    but the 2nd version is ready to go :)

    I learnt allot from the 1st one, especially not to by cheap rubbish. The flight controller did not have the sophistication I needed so that had to go and I'm now using this one. The body was not large enough to hold a decent sized battery and all the new electronics so that is now much bigger - about as big as I can print on my UM2.

    quad8.jpg

    below is a cut-away showing the battery mount and above that the printed sprung mount for the flight controller. The original flight controller was stuck down with a double sided pad that did not want to come away again - yech! So this one has a proper printed clamp.

    quad9.jpg

    The GPS module (with the compass) is mounted high in the dome away from high current motor wires.

    quad10.jpg

    Here is the printed and assembled quad. I have so far only done a stamina test, by making it hang stationary in the air exactly the way bricks don't. It reached over 18 minutes before going into RTL mode and landing safely :)

    quad7.jpg

    So what's everyone else up to?

     

    • Like 1

    ABS not sticking to build plate

    in UltiMaker 3D printers

    Posted

    I cover the glass plate with Kapton tape.Then dip a rag into acetone and wipe it on an old failed ABS fragment to bring a little ABS onto the rag. The Kapton surface is wiped with that and it puts a fine ABS film onto the Kapton (but make sure you do it cold). It sticks like s**t to a blanket when hot and releases reasonably well when cold. The bed is heated to 110C before printing at 250C.

     

    New Raft design Maybe

    in Coffee corner

    Posted

    For ABS I use 110 bed and 250 nozzle, for PLA I use 70 bed and 220 nozzle. I think 75 is too high for PLA, even my 70 is said to be too high. Readhttp://umforum.ultimaker.com/index.php?/topic/3404-printing-on-glass/ by gr5.

     

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