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Thread: Asi

  1. #1
    150+ Forum Groupie Kerbo's Avatar
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    Asi

    This thread will show my construction of an airspeed indicator using the techniques in Mike Powell's book.
    So far I have the faceplate and motor deck constructed from 0.064" aluminum.
    The motor was salvaged from an old HP Scanjet flatbed scanner, it is a nice little 1.8° stepper.

    I hope the pictures work, I am using Facebook to save my poor home DSL connection.


    Laying out the holes for the motor deck


    Faceplate and motor deck


    Motor deck from rear

    My wife was totally unimpressed, but maybe somebody here will appreciate what I am trying to do.
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  2. Thanks Geremy Britton, Trevor Hale thanked for this post
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    Quote Originally Posted by wriley View Post
    My wife was totally unimpressed,
    Yup! Been there.

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    300+ Forum Addict ak49er's Avatar
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    Looking good...

    Wow, looks great Wriley, tell us a bit about the servo motor and how you plan on interfacing it.

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    150+ Forum Groupie Kerbo's Avatar
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    Quote Originally Posted by ak49er View Post
    Wow, looks great Wriley, tell us a bit about the servo motor and how you plan on interfacing it.
    Thanks for the kind words.

    I haven't decided yet on how I am going to interface my instruments. The OpenCockpits stuff looks great but I may roll my own since I am familiar with Atmel AVR microcontrollers and enjoy that hobby as well. The downside would be having to write my own software. SIOC looks very nice and all the hard work is already done. For now I am enjoying dusting off my fabrication skills.

    I have started prototyping a USB-interfaced GA nav/com unit so have a head start on rolling my own, but that is for another thread someday.
    Kerbo on YouTube or Twitch
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    150+ Forum Groupie Kerbo's Avatar
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    More progress

    Final test assembly before painting. The only mechanical piece left is the connector that joins the stepper motor shaft to the pointer shaft.

    A big thank you to Jackpilot for sending me the faceplate graphic.









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  8. #6
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    That is a graet looking ASI, can i just ask if the acrylic as used in the cutout is for back lighting, is there a reason you have acrylic (clear plastic)?

    Alex


    Ps.How the heck do you make gauges that requires 2 pointers? does that completely change the design of the DIY gauge?

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    Quote Originally Posted by alexpilot2008 View Post


    Ps.How the heck do you make gauges that requires 2 pointers? does that completely change the design of the DIY gauge?
    You can use brass hobby tubing to make concentric shafts. Jan Verley has posted pictures of his DC-3 gauges here: http://home.versateladsl.be/verlejan/instr1E.html

    Also, take an extended look at Scott Hendry's superlative gauges: http://home.exetel.com.au/flightsim/Engine_Gauges.htm
    Last edited by Mike.Powell; 01-31-2009 at 10:42 PM. Reason: added new content

  10. #8
    150+ Forum Groupie Kerbo's Avatar
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    Quote Originally Posted by alexpilot2008 View Post
    That is a graet looking ASI, can i just ask if the acrylic as used in the cutout is for back lighting, is there a reason you have acrylic (clear plastic)?
    Thanks! Right now all I can see is the crooked faceplate deck and the misaligned holes in the light diffuser deck and the... but I'll get over it and do better on the next instrument.

    And yes, the thick acrylic is there for back lighting. You can't see it in these photos but there are four holes drilled into the back of it for LEDs.

    Quote Originally Posted by alexpilot2008 View Post
    Ps.How the heck do you make gauges that requires 2 pointers? does that completely change the design of the DIY gauge?
    The basic construction is the same but you add a concentric shaft and gearing. It's all documented in Mike Powell's excellent book.
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  11. #9
    150+ Forum Groupie Kerbo's Avatar
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    More progress



    Kerbo on YouTube or Twitch
    github.com/wriley

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    150+ Forum Groupie Tony Hill's Avatar
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    Nice work. I love to see people who can build their own stuff.


    .
    "Tony"

    In memory of Flt Lt Tony Hill who, on 5 December 1941, at the request of Doctor R V Jones, successfully photographed a small "Würzburg radar" at Bruneval on the French coast. This from a height of only 200 ft, at high speed, under fire and from a camera mounted obliquely behind the cockpit.

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