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Flexy-Hand Hinge Mould

by Gyrobot, published

Flexy-Hand Hinge Mould by Gyrobot May 6, 2014

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Summary

A mould that you can print out and inject silicon sealant, latex, polyurethane, etc to make your own flexible hinges for the Flexy-Hand, Flexy-Hand 2, or other applications.
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Due to the new additional hinges for the Flexy-Hand 2 gauntlet attachment, I have modified this mould from the original 2 half design.

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Instructions

Print as many moulds off as you wish.
For each Flexy-Hand you will need 4 of the tallest hinges and 11 of the middle height. And for the Flexy-Hand 2, you will need 2 of the lowest hinges for the gauntlet attachment.
Place tape over the lower surface to stop sealant leaking.
Tip : To help reduce adhesion of the sealant to the mould, a few techniques could be used : Dust lightly with talc/chalk or lightly coat with oil, butter etc.

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Hi. Working in LVDC Musoma, Tanzania. Took a 4 hour bus journey to Mwanza to buy silcone sealant. Had already printed the hinge mold. Have now tried the silicone but they have come out far too flexible. Had tried fila-flex first but they are too stiff. Would appreciate any advice or ideas.

With Filaflex, you can print soft hinges by printing with no infill inside and just a couple of perimeters, and hard hinges when the print is fully solid. There are also all the combinations in between.

I don't know the specs of you printer so parameters such as nozzle size and extruder flow rates will change the properties of the part too.

You will need to experiment with different infill and perimeter values to get the right hinge, but as a guide, my hinges are printed with 2 perimeters and 10% infill with two layers top and bottom.

That's great advice thanks. Will try.

Thanks so much. So kind of you.

would you be able to use sugru for these hinges?

Yes or even Oogoo :
http://www.instructables.com/id/How-To-Make-Your-Own-Sugru-Substitute/

But to help prevent the hinge from tearing, I recommend small piece of cotton to be cut and placed in the mould, to help arrest any cracks.

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