On Thu, 04 Feb 2016 07:16:02 -0600, Ignoramus11775
wrote:

We are making a computer programmed robot that works according to a
program, that picks up various objects with a claw and places them
into certain spots according to the program.

The problem is that I have some slippery objects (pencils with
newfangled paint that is very slippery) and they slip out of the
claw.

It is not easy to increase the strength of the claw, so, I was looking
for some soft material that has an adhesive side and provides a lot of
friction on the other side, but NO sticking (not like glue).

Anyone knows what I can buy that would work?

An example of a high friction material are those car cell phone mats
that keep the phone in one place on the car dash.

Two things come to mind.

1) Friction tape is a low-adhesive doublesided black cloth tape which
has a coating that resists slippage. It would be quickly replaceable
at a competition, as well. I haven't bought any in 30+ years, but I
figure it's still available. Ayup, http://tinyurl.com/jmdr7vu .

2) Dip-it liquid plastic coating for tool handles might work for you,
but I doubt it would be as stick as friction tape.

--
I would be the most content if my children grew up to be the kind of people
who think decorating consists mostly of building enough bookshelves.
-- Anna Quindlen