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….....g ------ 3D Printed Servo Bracket for Turnout Control ---

.....g.... --- Print files for this Bracket ( HERE ).

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WARNING: One person bought Miuzei SG90 servos on Amazon and they didn't work.

Went 90 degrees each time they were powered on. I would stay away from them.

If you find servos that don't work let me know.

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You can find all the files to 3D print this object and others on my thingiverse.com account ( HERE ).

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 to print the bracket ( HERE ).

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

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

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I'd like to hear for anyone who decides to try the bracket (contact20 (at) 1fatgmc (dot) com). Let me know if the bracket worked for you and/or if you can see the need for any changes.

I'll pretty much let the following pictures tell more about the bracket.

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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')

A couple links to possible sources for the limit switch:

https://www.ebay.com/itm/10PCS-Limit-Switch-3-Pin-N-O-N-C-5A-250V-AC-11-3Z-Micro-Switch-US-STOCK-/132982902026?nma=true&si=U5DuZnreedOiPhMbVBbDzUGmDnc%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557 ( my source )

https://www.amazon.com/MXRS-Hinge-Momentary-Button-Switch/dp/B07MW2RPJY/ref=pd_sbs_328_1/136-5383031-0422533?_encoding=UTF8&pd_rd_i=B07MW2RPJY&pd_rd_r=96806b4c-8dab-478d-8df5-32a7d03864b9&pd_rd_w=d0xpS&pd_rd_wg=zJdoM&pf_rd_p=d28ef93e-22cf-4527-b60a-90c984b5663d&pf_rd_r=7YD0P10EK834N6QAHG3W&psc=1&refRID=7YD0P10EK834N6QAHG3W

https://www.amazon.com/10PCS-Switch-KW11-3Z-Microswitch-Buckle/dp/B01HA88S58

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.

(NOTE: In the pictures you will see different screws being used on the test rig. I ordered the Phillips pan head since Phillips are so much easier to screw in vs. the straight slot screws you see in some of the pictures. I had those so used them for the test.)

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..............................--- Update: 11-11-2020 ---

I had a friend that had to locate two electrical switches on the post on the servo bracket and the post started to separate from the rest of the bracket. In the following pictures you can see the updated servo mount with a reinforced post.

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The files on thingiverse.com for the servo bracket have been updated to using the new bracket and you can find them ( HERE ).

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Again, I'd like to hear for anyone who decides to try the bracket (contact20 (at) 1fatgmc (dot) com). Let me know if the bracket worked for you and/or if you can see the need for any changes.

You can find all the files to 3D print this object and others on my thingiverse.com account ( HERE ).

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