[Published 19th Aug, 15:43 ]
Reason for starting research PnP
Watches that PnP dial video embedded in a previous log
Me: Hmm that seems kind of long... I wonder if I could at least automate the rotations of the disk.
Somewhat related hackaday article:
Me: I don't have that kind of time!
Looks at the link in the hackaday article
The person who made the pump:
It seems that this was written in 2015, so there's a good 7 years in which innovation could've taken place.
Anyway, I've realised that I don't need to limit the Z height of the paste/fibre head to the same height as the roller, since as long as it's under around 65mm in Y, it can be fully moved out of the way. Thus, I'm researching PnP grabbers to see if I can fit it in the head and eliminate the arm entirely. I was worried about having to have multiple nozzle for different sized components, but as you can see from that hackaday commentor's experiment above, it's likely a non issue.
Researching silver paste
I also need to decide how heat would be applied to the components and silver paste. I might have to find a room/low temperature silver paste. Doing some light research suggests that the question of solder paste vs silver paste adhesive has been asked before.
This gives the impression that it's possible to not need the former and that the components would stay on the substrate well enough to be moved into a curing oven (in my case, probably a food dryer or a heated 3D printer bed with a bowl on it).
Back to the research paper, they used a 250um nozzle and I didn't see the "and height" part of the below sentence:
https://unimtech.com/pastes-for-printed-circuit-boards/ has pastes that can go as low as 50um line width and >150mm/s print speeds with a viscosities of <350 cP and particle sizes of <8um. The issue is the high cure temperatures and no indication of price, so it's probably £££.
It seems that implementation complexity is something that I'd have to visit at a later date, since I'd need equipment to conduct my own tests. For now, I've got a general idea of the system, so I can make a concept placeholder for the design. Due to favouring probability-of-success and wire management over saving a £ here or there, I'm going back to the M8P + Monster8V2.
Due to the fact that this printer is targetting the consumer and light prosumer, I'm expecting that most components won't be bought in enough quantities to come on a reel. The PnP would pick the components from trays similar in size to the PnP wheel.