ballendo wrote:
>>In Homebrew_PCBs, Russell Shaw wrote:
>>
>>Head movement at max servo speed will be "quick" (60V servo drive
>>ability), but i haven't got those numbers with me atm.
>
> Russell, I'm interested in how you plan to feed the parts? And how
> you intend to orient them?
The tape from reels has a row of holes. The reels sits on a shaft
with a simple friction hub. The tape is fed between two rollers for
initial tape positioning. The tape base is pulled by a 3rd tooth
roller against another plain roller. Another pair of rollers does
the peeling of the top tape layer. The pickup is just a sawn-off
syringe needle with a flat end, and is spring-loaded vertically.
The vacuum (from a small diaphram pump) in the tube picks up the
component from the tape. After pickup, the component is held in
a simple device that can accurately orient the component in any
direction. The component is then placed.
> Sounds like it'll be a nice machine. I've excerpted the part above
> because it relates to the machine Mariss Freimanis uses for
> assembling his Geckodrives. That machine is a 14K parts per hour
> PNP...
>
> I've been driving a fair bit lately, and was figuring out how fast it
> had to move to do that as I drove. Scary. Found out later it had
> three heads working simultaneously. STILL scary.<G>
They use mnachine vision for orientation and compressed air to shoot
the components onto the paste.
> Ballendo
>
> P.S. lesseee, how many of my little hobby/small shop machines would
> it take for 14K parts per hour...<G> (Prob'ly still cheaper though!)
They need the high speed to justify the price they charge, and because
buyers are willing to pay for the speed. It's cheaper to design and
build your own machine these days (if you're a small outfit) if you
dedicate the machine to your own products that aren't likely to have a
huge volume. Machines are cheap at auctions, but support and accessories
still cost $$$.