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Using a depth gauge for cube tensioning

Discussion in 'Hardware Area' started by chron0s, May 16, 2018 at 9:53 PM.

  1. chron0s

    chron0s Member

    63
    14
    Feb 20, 2017
    I picked up a depth gauge (iGaging 0-4" Electronic Digital Depth Gauge SnapDepth 0.0005" Inch/Metric/Fractions Tire Tread Gage) on Amazon and just used it to adjust tensions on my Huanglong 3x3 - has anyone tried this? It worked well!

    Usage was simple - I had already assembled, lubed, and tensioned the cube manually - I had all my screws aligned and (I thought) at the same tension.

    I went around the cube measuring the distance between the screw head and the outer surface of the puzzle. As it turned out, a few of the screws were a little tighter than the rest. I adjusted all screws to be essentially the same distance using quarter turns, and now the cube feels exactly tensioned on all sides.

    You just zero it, then push it down to get a reading - simple. Cost about $15 but you can probably find them cheaper.

    61Z5GmUJE8L._SL1000_.jpg

    Here's how I used it.

    First, I zero the gauge on the top of the cube. This pushes the probe all the way up into the device, and sets it to zero. The gauge will now measure depth, proportional to how much the spring loaded probe is sticking out from the bottom:

    IMG_3551.jpg

    After that, I remove the center cap and align the probe onto the top of the screw:

    IMG_3552.jpg

    Push the gauge down so its flush with the top of the cube, and take a reading:

    IMG_3553.jpg

    It's hard to see the reading but this is showing me that the screw is tightened down so its 5.31mm LOWER than the top of the cube.

    If I go around the rest of the cube now they're all tightened to essentially the same depth - 5.30, 5.32, 5.31... much closer to equal than I could get the tensions just by using my eye.

    Hopefully this makes sense!

    Unfortunately the probe itself is a little too wide to fit comfortably between the center tiles of my Wuque 4x4. the tip unscrews (so you can make the gauge longer) so its possible to make a thinner attachment that threads on. I'm going to see about finding or making something that will allow me to take measurements in more confined situations like on a 4x4.

    I also adjusted tensions on my cyclone boys skewb. Here I'm measuring how far the screw is tightened with the lip of the surrounding piece internal as the reference point. This measurement was a little harder because the diameter of the piece internal is so small and the tool isn't totally flat there - you can kind of see this in the picture. I need to get a straightedge I can use in a situation like this to get a level surface that is wide enough to seat the tool on if that makes sense. Nonetheless with a little care I was able to get all the screws adjusted - some were off by up to 1.5 turns:

    IMG_3554.jpg

    Update: did my chuwen as well - the 2x2s with the rounded edges are easy to tension using the gauge. Once again, one of my screws was off even though it looked fine to my eye.

    I realized that for doing 4x4s etc, I can probably just tape a paperclip or something similar to the probe to 'extend it'. It just needs to stay put during measurement. I'll try it later and report in the thread if it works - a permanent attachment would be nicer of course but that will take some time to develop.
     
    Last edited: May 17, 2018 at 1:11 AM
  2. joshsailscga

    joshsailscga Member

    859
    128
    Dec 18, 2014
    Maryland, USA
    WCA:
    2014MORR01
    That's good stuff, man. Thanks for sharing.
     
  3. Draranor

    Draranor Member

    203
    62
    Jan 8, 2016
    Arkansas
    WCA:
    2016REIC01
    Awesome, I’ll have to try this out for myself
     
  4. chron0s

    chron0s Member

    63
    14
    Feb 20, 2017
    Was just chatting with DMCubing, he shows this technique in one of his videos (need to track it down) and I think you can use a regular digital caliper for this! I think this is the right tool for the job, plus you can use it for measuring plastic thickness.

    Just ordered this one:

    61FUoTB00AL._SL1100_.jpg

    The little part sticking out from the bottom can be used to measure depth - simple as that! And easier to use with 4x4 cubes for example.

    UPDATE:

    Man DMCubing is an awesome resource for cube setup and refinement - his videos got me into magnetization of cubes and really just into cubing in general. He's been using this technique for a few years, here's a good pic of his using a regular digital caliper with a depth gauge to check tensions on a 5x5. This is better than the tool I posted I think- you get a solid reference line on the bottom of the caliper and the probe is a lot thinner. For the most consistent measurements you'll want to make sure that the bottom of the tool is squarely against the surface of the cube:

    IMG_4833.JPG
     
    Last edited: May 17, 2018 at 4:38 AM
    DMCubing and joshsailscga like this.
  5. DMCubing

    DMCubing Member

    137
    75
    Feb 19, 2017
    Shreveport, LA
    You're too kind. You certainly don't have to credit me though. It's cool you came up with a similar system. And you're so right about using the tool flat and squarely against the cube. That's important.
    I've done it this way for a couple of years. But on some cubes, like the GTS2M, I eyeball the threaded portion of the axial screw and adjust each to where it is in just at the end of the angled portion (before the threads start) and back up just a hair. It's backed out ever so slightly more than where the factory sets them.
     

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