Introduction: X-Mounts

About: I work at RobotZone ( the folks behind Actobotics and ServoCity.com ) in Winfield, KS. I love working on projects with my kids and seeing what they create.

This instructable is super simple. I just wanted to share a little adaptable method I've been using to mount various robotics components without two-way tape, zip ties etc.

It is quick to adjust the size (within a certain range) and holds surprisingly well when the center screw is nice and tight. It is worth noting that you could also use springs, o-rings, or rubber bands across two of the tips to hold it together instead of relying on a tight center screw (though I have not tried it since this works out pretty well).

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Step 1: Choose Your Grommet and Beam Size.

I used plastic beams but aluminum beams would work just as well and probably look cooler. They range in length from 1.54" up to 12.32" on ServoCity.com. The beam length you need will of course depend on the size of the item you are trying to hold.

There are a variety of grommets available, I experimented with 3 different styles.

For electronics boards I really like the 9600K53. Electronics boards fit very nicely in the slot between the top and the bottom.

The tall and thick 9310K16 has a nice combination of being sturdy and soft... I've used it for batteries and phones.

Step 2: Put It Together

I press fit the grommets onto 1/4" OD 6-32 tapped standoffs. The length of the standoff depends on which grommet you go with. I used a 3/4" long standoff (534-3488) for the tall 9310K16 grommet and I used a 1/2" long standoff (534-3487) for the shorter 9305K32 grommet. Though the 9600K53 (the one with edges that hold electronics boards nicely) has a larger inner diameter so I needed to use some 3/8" long #10 nylon spacers (561-KSP172) instead of threaded standoffs, which meant I also needed some nuts for that one.

Since one beam will be a beam's thickness is higher than the other I spaced up 2 of the 4 grommets with 1/8" long #6 nylon spacers (0.14" ID , 0.25" OD) so that they are all about even.

Join the two beams by simply putting a screw through the middle hole of each... I put another nylon spacer on the bottom to account for the height of the screw heads at the tips.

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    6 Discussions


    4 years ago

    RAM makes these I've been using them for years. DIY & save $‼️ Nice idea??

    Edwin Holman
    Edwin Holman

    4 years ago on Step 2

    Beleza! (nice)

    Simple does it.

    Thanks for the idea.


    4 years ago

    thanks, verry usefull when you can't make hole on a PCB !

    Just4Fun Media
    Just4Fun Media

    4 years ago

    Very neat idea! Have you done any testing with vibration or movement to see how well the x-mounts hold?

    Have a great day! :-)


    Reply 4 years ago on Introduction

    Thanks. Nothing very scientific, mostly just hand-held shake tests. Also I have had them on a small robot for a week or so and now with no issues. In fact I have the taller grommet version holding the battery on the bottom of the bot facing down and it seems to hold just fine - note that I am driving a small bot indoors NOT doing anything like this: https://www.youtube.com/watch?v=TSAqW9H-gZw with it