Here is an idea (I think). Rather than have a brush curtain why not have an air curtain. The basic idea is to have a dont shaped mainfold into which a set of nozzles fit, either that or one long nozzle. You pass compressed air through the nozzles (perhaps not at full pressure), the air hits the machining surface and tends to push chips towards the centre. The awaiting vacuum then picks them up. With adjustment it should be possible to get a high velocity air loop going from nozzle to vacuum.
I just thought this might be a nice way to do it for 3D stuff, it is works that is.
Graham |