A Trick to Open the Dividers

Posted on 28 November 2016

Open Your Dividers from Christopher Schwarz on Vimeo.

The Crucible Improved Pattern Dividers are supposed to be set tightly so they will hold their setting in any workshop situation. The only downside to setting them tightly is they can be difficult to open when the dividers are completely closed.

To make it easier to open them, we’ve done two things: First, we made the dividers so the tips don’t completely close. The small gap between the legs makes it easier for you to open the legs. Second, we’ve milled a chamfered slot on the legs that allows you to grip the legs to open them.

If you are still having trouble opening them, watch this video. Raney shows you an easy way to press the milled chamfer on a corner of your workbench to open the legs of the tool.

— Christopher Schwarz

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  • Shane Person: December 13, 2016

    Ok it’s settled then! " Crooove" it shall be!
    (If I may be so presumptive)

  • Eric Brown: December 04, 2016

    Perhaps “Leg Divots” would work?

  • Niels: November 29, 2016

    I wish, no more blowing till next week. Until then, all I’ve got to keep me going are internet videos of dudes fiddling with tight metal crotch-slots. Hahaha.

  • raney: November 29, 2016

    Joe – we tried several prototypes with grooves on both sides, but we (and our beta test gimps) all liked them better with just one side grooved. Having just one side let us run the groove a bit deeper as well, which makes the technique on the video work much, much better.

    As near as I can tell, the grooves show up in nautical dividers the overwhelming majority of the time – and my theory is that they were there mostly for use with gloves or cold hands. For hands, having them on both sides would probably be a plus, but we wanted to be able to crank these down stupidly tight, and at the tightest settings there’s no way to open them by hand even with doubled grooves.

    So we opted for a single deeper groove, and I profiled it specifically to make this work well.


  • Joe: November 29, 2016

    The groove is only on one side? Most of the old dividers I’ve seen have them on both. Other than less machining, is there a particular reason for this?

  • raney: November 29, 2016

    It’s not like it started all that well, Niels… now shouldn’t you be off blowing something?

  • Niels: November 29, 2016

    “We’ve put in this little groove, which we’re going to have a contest to name because we can’t figure out what to call it”
    Oh boy…. (This is going to end badly)

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