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Thread: 3D Printed Bracket to Mount SG90 Servo Under a Turnout...

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    Default 3D Printed Bracket to Mount SG90 Servo Under a Turnout...

    I plan on throwing all the turnouts on the layout that are within easy reach with my 'Hidden Switcher' ( HERE ). For the others I'll use servos and control them inexpensively with the controller ( HERE ). I wanted a bracket to mount the servos that I could 3D print with my Ender 3 Pro so designed the bracket on this page with Fusion 360. It was a pretty simple design and at this point using it on a test rig I'm really happy with it. You can find the files on my thingiverse account at the link at the bottom of this post under my name.

    Pros:
    No assembly.
    Small Footprint.
    Cheap.
    Place to mount limit switch that changes the polarity of the frog when thrown.

    Cons:
    Need a 3D printer or access to one.


    I'll let the pictures do the talking and you can find a lot more along with a parts list on my site ( http://1fatgmc.com/RailRoad/3D-Printer-2/page-24.html )





















    Parts for the Servo Bracket:

    1--Servo Bracket – My thingiverse account ( HERE )

    1-- SG90 Servo – Ebay or other sources

    1-- Micro Limit Switch – See picture for dimensions. (Google 'micro switch kw11-3z' or 'MXRS SPDT 1NO 1NC Hinge Lever Momentary') You can find a couple links to possible sources for the limit switch on my site.

    2-- #4 X 3/8” Pan Head Phillips screws (to mount servo to the bracket)

    1-- #4 X 1/2” Pan Head Phillips screw (to mount limit switch to pad under it)

    1-- #4 X 5/8” Pan Head Phillips screw (to secure the limit switch from turning – you might try without this if you can tighten the other one enough.

    I also made a couple tools that help to quickly locate and mount the bracket on the underside of the layout and will put them in the next post,

    Sumner
    Last edited by Sumner; 4th Jul 2020 at 10:53 AM.
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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  3. #2
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    Here are the tools I designed that make installing the bracket simple, fast and accurate the first time.


























    Next I'll add the steps using these two tools.


    Sumner
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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    To be continued.....
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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    Install continued....















    For a very inexpensive controller for the servo click ( HERE ).

    More pictures and info on my site here....

    http://1fatgmc.com/RailRoad/3D-Printer-2/page-24.html


    Sumner
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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    Thanks for this @Sumner! I recently bought some of those little servos, now I know how to control them without expensive electronics. I like your printed mounting bracket but, not having a 3D printer, the aluminium bracket looks good too. I've also seen aluminium U channel used as well...
    Cheers,
    Russ

    CEO Moss Lake Lumber Co.

    Pennsylvania logging circa 1890s

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    Quote Originally Posted by mosslake View Post
    the aluminium bracket looks good too. I've also seen aluminium U channel used as well...


    Not sure if you found them but there are more pictures of the aluminum one here ....

    http://1fatgmc.com/RailRoad/Trackwork/page-7.html

    I went with that instead of the U channel as it was easier to also incorporate the limit switch to change the polarity of the frog.

    Sumner
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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    Yep, looked at that. I'm undecided what to use just yet. Using hollowcore doors topped with extruded foam for the layout means space is limited to mount the servos. The photo in the link you had with a servo encased in foam is probably what I'll have to do.
    I like the looks of the Berrett Hill controls so may yet go with that.
    Cheers,
    Russ

    CEO Moss Lake Lumber Co.

    Pennsylvania logging circa 1890s

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    Quote Originally Posted by mosslake View Post
    The photo in the link you had with a servo encased in foam is probably what I'll have to do.
    Not sure which photo that is? I've seen pictures of the servo under the turnout embedded in the foam though. I'm not sure having the servo where you cant easily change it out is something I'd want to do, but they are probably pretty darn reliable. With the thickness you are going to have with the HCD and foam it might be your only option. I have a 1 1/2" total thickness and it works fine. With more thickness the servo will actually throw the wire further so throw distance isn't an issue. What might be is does the servo still have the power to hold the points firmly closed at say thicknesses over 2 1/2 inches or whatever you are going to end up with. As the length of the wire gets longer so does the lever arm and the servo has to work harder to hold something. Moving the wire inward on the servo arm is going to help that as the servo will have to turn the arm further to get the same throw distance which will work in the servos favor. Best to try it and maybe those on here that have thicknesses over 2 1/2 inches can jump in here.

    I started with wanting to have all my turnouts operated by servos but since have now thought I want as many as possible manually operated. I guess I won't know which I prefer until I get them in. If manual interests you you might check out what I'm calling the Hidden Switcher ...

    http://1fatgmc.com/RailRoad/3D-Printer/page-1.html

    I've tried it on my test track and so far like it there. Not as hidden as a servo operated one but still pretty 'hidden'.

    Sumner
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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    If it's got to go under the foam it'd be under buildings so it can be accessable (I hope).
    Your link to the David Bodner page, he has a U-tube clip with a servo in the foam-
    http://www.trainelectronics.com/Serv...le-controller/
    If there's ony 1" or 2" foam, it'd probably have to go on it's side and a wire-in-tube setup to the switch. That way the servo can be remote from the actual switch.
    Cheers,
    Russ

    CEO Moss Lake Lumber Co.

    Pennsylvania logging circa 1890s

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    Comfortably numb was using one of the servo brackets in his 'Star' build ( https://www.nscale.net/forums/showth...Hand-Laid-Star ) and had to mount two electrical switches on it to change frog polarity. With the servo pressing against both it started to separate the mounting post from the rest of the bracket. I ....



    .... redesigned the mount and ....





    ... think it is now quite a bit stronger in the post area.





    The new files are up on my thingiverse.com account ....

    https://www.thingiverse.com/thing:4515776

    ... more about it here .....

    http://1fatgmc.com/RailRoad/Servo%20...l/page-12.html

    Sumner
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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    Nice! I'll need some of these when I get back to my layout build. You have the 3D files on your website in the first post, right?

    Well done!
    Never mistake a guy who talks a lot for a guy who has something to say...

    CH&FR Site and Blog: http://www.chfrrailroad.net and http://blog.chfrrailroad.net
    Appalachian Railroad Technology: http://www.apprailtech.com


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    Quote Originally Posted by TwinDad View Post
    You have the 3D files on your website in the first post
    Yes and they are in the post right above yours. More about the servo bracket on my web site but the files are on thingiverse.com,

    Sumner
    Last edited by Sumner; 12th Nov 2020 at 04:05 PM.
    Modeling UP from late 40's to early 70's very loosely......

    Under$8.00 Servo turnout Control --- 3D Printed Model RR Objects -- MyHome Page
    http://1fatgmc.com/RailRoad/RR%20Mai...ge%20Menu.html

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    Quote Originally Posted by Sumner View Post
    Yes and they are in the post right above yours. More about the servo bracket on my web site but the files are on thingiverse.com,

    Sumner
    Thanks! I really like the alignment tool. Great idea!
    Never mistake a guy who talks a lot for a guy who has something to say...

    CH&FR Site and Blog: http://www.chfrrailroad.net and http://blog.chfrrailroad.net
    Appalachian Railroad Technology: http://www.apprailtech.com


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