Page 1 of 2 12 LastLast
Results 1 to 10 of 17

Thread: Servo vs Stepper Motors vs simple hobby motors...

  1. #1
    Low Bitrate
    Join Date
    Jun 2003
    Posts
    70

    Question Servo vs Stepper Motors vs simple hobby motors...

    Hi all,

    Great resource this . I've been running a PC in my car for 3 years now (http://www.chiark.com/scooby/limp.asp) and am updating it all to be a bit nicer

    I've just bought a screen from DSCustoms to go on my Epia board to replace the old thing and give me more functionality... I'm now wanting to motorise the thing in and out of the dash.

    Searching has kept me busy literally for hours, and I think I'm slightly confused.

    I have a cunning hole on the top of my dash which currently has a clock mounted in it. It's big enough for the screen to lie flat (horizonally) in, and it's right in my line of sight, so...

    I want to mount the screen there, but for security reasons mount it UNDER the existing horizontal cover which the clock is mounted in.

    In short, I want to motorise this cover to hinge from the back and flip up. I then want to motorise the screen out from lying flat under the cover to be vertical. Then I want to drop the cover back down.

    What should I be considering for this? Servos seem to be most commonly talked about, but are they the right technology for this?

    I realise this is hard to visualise, so I'll take some pictures of my plan tonight

    Cheers,
    Nick.

  2. #2
    Low Bitrate
    Join Date
    Jun 2003
    Posts
    70
    Here's those pics. Worth a lot more than the words above

    The standard dash:


    With the clock mount "lifted" and the LCD in its hiding place:


    And how it might look...


    Any advice gratefully received

    Cheers,
    Nick.

  3. #3
    FLAC mp3z24's Avatar
    Join Date
    Apr 2001
    Location
    Chicago Suburbs
    Posts
    1,282
    hey... your steering wheel is on the wrong side...

    anyway... what you are saying is definately do-able, but is see some problems with your description already.

    you might consider doing this:

    flip the clock cover plate up with a hinge toward the front of the car.
    then use another motor to rotate the screen up with a hinge located toward the rear of the car.
    then as an added brace you might want to rotate the clock cover down into the back of the screen.

    this design would only use 2 motors. although you would have to provide some sort of motor controller circuit... they are availaable out there.... somewhere.


    if you are trying to get the clock cover to completely close, after the screen is open, that is also do-able, but it would require some intricate linkage design, as well as some cutting of the clock cover.

    just an idea for u to toss around.

    ~mike
    Single Member of the "1000 Post and No MP3 Car" Club
    PROJECT ON INDEFINATE HOLD... BOUGHT A HOUSE
    2000 Cavalier Z24 [###-------] Only 30% Done ... Still

  4. #4
    Maximum Bitrate eCarô's Avatar
    Join Date
    May 2003
    Location
    SE Michigan
    Posts
    810
    Servos are overkill, and require controllers to run them.

    Since you are moving from one stop to another, a regular DC motor would be all you need. If you needed to stop at different positions along the way, use a stepper.

    I might also consider pneumatics, if space is an issue.

  5. #5
    Constant Bitrate henkbliek's Avatar
    Join Date
    Dec 2002
    Location
    Netherlands
    Posts
    172
    @eCar;
    From what they can do, you are right on the servo's. However, a pro for these devices is their availablity and low-cost. I would not be easy to make a low-rpm and high torque dc-motor for less money.
    So a servo motor might be the best choice after all.
    Another nice thing of servo's is that these usually are supplied with hevels. That makes connecting to the tilting display very easy (quite analog to driving a rudder in a boat or a airplane).

    white bream
    working on a trilogy: CARGO - UNIGO - MERGO
    CARGO = the Car Computer
    Intel Celeron M, [P]SDC, uBlox GPS, GPRS, WLAN, Silabs FM, RDS, TMC,
    Dual-audio, Onecable TFT, Microsize: 45 x 108 x 168mm (1.8 x 4.3 x 6.6")

  6. #6
    Maximum Bitrate eCarô's Avatar
    Join Date
    May 2003
    Location
    SE Michigan
    Posts
    810
    Originally posted by henkbliek
    @eCar;
    From what they can do, you are right on the servo's. However, a pro for these devices is their availablity and low-cost. I would not be easy to make a low-rpm and high torque dc-motor for less money.
    So a servo motor might be the best choice after all.
    Another nice thing of servo's is that these usually are supplied with hevels. That makes connecting to the tilting display very easy (quite analog to driving a rudder in a boat or a airplane).
    I don't consider servos to be low cost. Availability should not be an issue with whatever type of motor you choose. And I should have said a DC motor with gear reduction.

  7. #7
    Variable Bitrate
    Join Date
    Sep 2000
    Location
    LA, CA, USA
    Posts
    444
    Doable, but will require some clever hinging to get the cover to close when the lcd is fully "out". 2 servos, clever hinging, and the appropriate gearing and you've got it.

  8. #8
    Low Bitrate
    Join Date
    Jun 2003
    Posts
    70
    Cheers all for your help so far

    The "plan" is to cut a very small D-shape out of the front of the flap, and use a rubber "grommet" flappy bit to allow the flap to still go down behind.

    Otley models, mentioned by sproggy (what's happened to him?) are just up the road from me...

    I think I need to construct this in a non-motorised form then look at automation as and when

    Cheers,
    Nick.

  9. #9
    Low Bitrate Henry Winx's Avatar
    Join Date
    May 2003
    Location
    Derbyshire/Cirencester UK
    Posts
    88
    That will look ace when it is finished Nick!

    I was wanting to do a similar kind of setup but comming out of a single din dash slot, so can't wait till you have yours done so I can get an idea of how it could be done!

    Just waiting for the group buy on scoobynet now, and I can get it all finished

    Henry

    p.s I think DS customs are doing something similar to my idea, but want to do it myself to try and save some dosh!

  10. #10
    I'm sorry, and you are....? frodobaggins's Avatar
    Join Date
    Jan 2003
    Location
    Ruston, LA
    Posts
    8,846
    I don't have any suggestions but I wish you good luck. If you can pull it off I think it will look nice.
    [H]4 Life
    My next generation Front End is right on schedule.
    It will be done sometime in the next generation.
    I'm a lesbian too.
    I am for hire!

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •