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Thread: Proper size hole in PVC for RGB dome pixel (bullet)

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    New Member HuskerBob's Avatar
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    Default Proper size hole in PVC for RGB dome pixel (bullet)

    My project consists of using some 10' lengths of 1" PVC cut in half lengthwise. I am then going to drill holes 3" apart and insert a dome RGB pixel through each hole (standard dome/bullet pixel string from Ray Wu). I have played around with various size holes, and 13mm seems to work the best (33/64" was just a little too snug). This is assuming my thought of how much of the actual pixel should stick through the hole is correct.

    Also, should I put any type of silicone sealant around the pixel?

    I have attached an example of what a 13mm hole. Any lessons learned or advice/recommendation/opinion would be greatly appreciated.

    Thanks in advance,
    Bob

    -dome-pixel-13mm-hole.jpg

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    Senior Member mpurser's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    i put mine in 13 mm holes with no sil or glue thay will be tight but im told a snug fit is best a little tuff to push in but everyone i know uses a 13 mm hole for a 13mm bullet node and what i see in your photo looks about right for height.
    .
    are you sure we checked every bulb?why is that one pixel staying on
    ]www.thelightsonpurserroad.com20200 rgb channels for2018

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    xLights or BUST in 2018 kidcole's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    The drill bit I bought from Holiday Coro for putting pixels in Coroplast was 12mm. That's the size they recommend for their pixels. They fit great. And also work for Ray's. I have not tried PVC with this bit. Since PVC does not "give" as much as Coro, the larger 13mm might be an OK recommendation.
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    I Went Static in 2017. FINALLY Moving to Xlights for 2018 !

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    New Member Charlie's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    @HuskerBob, how did you secure the pixel to the back of the pvc? I'm prototyping a pixel-in-pvc project and keeping the pixel, snug in place is a concern.

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    New Member HuskerBob's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    Quote Originally Posted by Charlie View Post
    @HuskerBob, how did you secure the pixel to the back of the pvc? I'm prototyping a pixel-in-pvc project and keeping the pixel, snug in place is a concern.
    Actually, using a step-down bit, I made my holes 1/2" (as suggested by someone on this site) and the bullets fit in snugly enough to stay put. I did not add any extra steps to secure. It worked well enough for my needs. They were underneath my eaves, and went the season without popping out. If I mishandled the PVC when putting things away, a light or two would pop out, but once I had the PVC installed there was no concern.

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    New Member Charlie's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    Interesting. My approach is with square pixels. I'm prototyping them in either a 3" or 4" non-pressure grade pvc pipe. My WOW lights, both bullet and square did not sit well standalone in a 1/2" hole. I took my 1/2" hole and filed it out to about 9/16" and fit a 7/16" ID rubber grommet. 1 square fit snug with a grommet sourced from Lowes and looked real nice, but that does not economically scale. A package of 100 are on order now for much less per piece as well as a 9/16" spade bit. Hoping to progress this in about 2 weeks once the grommets arrive.

    Curiosity - Is your pipe schedule40 or non-pressure?

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    Registered User EricR's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    Charlie did you try a 12mm hole? The bullets are made for them. There's a big difference from 12mm and 1/2" for this application, 0.7mm too big could be the issue.


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    New Member Charlie's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    Just tried the 12mm hole and still not a great fit. It may be the make of pixel too. For the pvc project I'll be using square pixels vs bullets since they will be placed in a tube. A 12mm hole for square is a little too large for the LOR pixels. A caliper measure shows 11.7mm for the bulb width. The WOW Lights bullet pixels fit into the hole and don't fall out, but they don't stay snug either. Kind of wobbly.

    The grommets arrived today too. They need a 5/8" hole to add the grommet, but once in place, the pixel sat snug enough in the tube. I'm probably going to go with this combination.

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    xLights or BUST in 2018 kidcole's Avatar
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    Default Re: Proper size hole in PVC for RGB dome pixel (bullet)

    Quote Originally Posted by Charlie View Post
    Just tried the 12mm hole and still not a great fit. It may be the make of pixel too. For the pvc project I'll be using square pixels vs bullets since they will be placed in a tube. A 12mm hole for square is a little too large for the LOR pixels. A caliper measure shows 11.7mm for the bulb width. The WOW Lights bullet pixels fit into the hole and don't fall out, but they don't stay snug either. Kind of wobbly.

    The grommets arrived today too. They need a 5/8" hole to add the grommet, but once in place, the pixel sat snug enough in the tube. I'm probably going to go with this combination.
    This is great info. And it helps to keep everyone up on these kinds of differences. My 12mm always seemed to work snugly in Coroplast. But you hit on a good point with the brands issue. In the early days I bet there was only factory making all pixels .. maybe 2. Now there are very likely many. And China is famous for not meeting standards from one factory to the next.
    Thanks,

    Denny Cole
    https://www.facebook.com/groups/Cole...ristmasLights/

    I Went Static in 2017. FINALLY Moving to Xlights for 2018 !

    Falcon - 3 F16V3 & 1 PiCap, Sandevices - 2 E681 & 4 E6804, 288 Channels Lynx Express, 108 Channels DC DMX,
    10' Pixel MegaTree, CoroFlakes w/Pixel Modules, Pixel RBLs, 2 Pixel Matrix 16x25, 10" RGB Ornaments, 7x230 Pixel Icicle Matrix,
    Classic 20' AC Megatree, TIR Destiny RGB Spots, RGB Blowmolds, Wireframes, and Inflatables with External Light Control

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