How to make a surface rough

richard_blackwell730

Help - what is the best way to make a surface rough? I have two parts which move with little pressure pushing them together. I do not want them to slip hence I need some sort of texture to increase the friction between the surfaces.
Any ideas or guidance would be much appreciated.
(PS: Clearly I am a noob but I am sucking up all the help I can get)
Thanks

jrs_spedley

Unless you want it like a camera mount with a set of 'bevel' gears that lock when you apply pressure.  That is easily possible usjng a bevel gear featurescript.

philip_thomas

Sandpaper?
Please do not model surface perturbations - that is not the way to go

richard_blackwell730

PS: It will be for two circular parts (like washers) 3D printed using PLA plastic. The circles slide against each other but I want them to grip slightly not slip.

daniel_splawski

Generally the surfaces of my 3d prints aren't very smooth to begin with so you might not need to add any roughness.  If you need a solution in onshape, you could extrude whatever shape you want as a new part, then use a linear or radial pattern to duplicate it.  Finally a boolean union to join all the parts together.  Depending on the application, this might result in too much sticktivity, in which case I'm not too sure what you should do.  

jrs_spedley

Don't think there is a rough option on onshape but perhaps there is a gnarling option for sheet metal work.
As for 3d printing, you can't get anywhere near that level of detail on a print but you should be able to buy a filament with the properties your require.  Often they can be bought in smaller spools of 10m or so for testing.  I suspect a wooden one may be the kind of thing you want - PLA with wood fibres in it.

jrs_spedley

Unless you want it like a camera mount with a set of 'bevel' gears that lock when you apply pressure.  That is easily possible usjng a bevel gear featurescript.

philip_thomas

Sandpaper?
Please do not model surface perturbations - that is not the way to go

richard_blackwell730

Thank you to everyone for the comments and ideas. You gave my brain the jump start it needed and I ended up changing my design completely. (https://www.thingiverse.com/thing:2448236)
The advice received is invaluable and will guide further projects. Thanks.