2) Skin

Painting pins

Order a tactip skin from us by contacting us via email. We will send you the skin for a small fee.

Spread a layer of white paint on a piece of acrylic. Insert your thumb in the skin and press on the white paint. Make sure all the pin tips are painted white.

Attaching skin

Thoroughly clean the 3d-printed tip and ring, to remove all traces of support material. This improves glue adhesion and ensures all parts fit together.Distribute a layer of Loctite 770 primer on the internal rim of the skin and the 3D printed tip to make the surfaces suitable for bonding with an adhesive.
3D printed tip and ringPutting primer on the tipPriming the skin
Wear gloves. Distribute a fine layer of Loctite 406 glue on the upper rim of the tip. Use a thin strip of a material that will not bond with the glue to do this (e.g.: polypropolene).Press the rim of the skin over the tip. The bond will form very quickly so ensure the  skin is placed in the correct position., flush with the first ledge on the tip. Make sure that no glue is present on the outside of the skin as this would locally reduce the compliance of the sensor.Make a hole in the skin aligned with the hole in the tip. This hole will be used to inject the gel in the tip. Let the glue dry for at least 10 minutes.
Apply Loctite 770 primer on the internal diameter of the 3D printed ring and the bottom part of the skin. Spread a thin layer of Loctite 406 glue on the bottom part of the skin.Slide the 3D printed ring past the rubber dome until it rests on top of the 3D printed tip and apply pressure.Make sure the hole in the ring aligns with the holes in the tip and skin. Leave the glue to dry for half an hour.