On 07/18/2020 06:08 PM, Bari wrote:
On 7/18/20 5:56 PM, Jon Elson wrote:
It would be hard to do anything like this with a Delta
scheme, as the errors stack up.
Why I asked.
Well, the Quad IV C has a gantry with 1 um glass scales on
it, apparently. The Quad QSA-30
has shaft encoders with high resolution, I don't know what
the resolution is, but I'm guessing it works out to
better than 25 um, for sure. And, there is no angle to
linear conversion required. These machines have very
limited Z movement, but a LOT of X-Y movement, somewhere
around a meter or more, to reach all the feeders. Also, the
machine moves a head that must weigh 20 kg, at least, at
several m/s, back and forth, from feeders to the board being
stuffed. It has to provide placement accuracy of better
than 0.1mm over this entire range of motion.
I just don't see how a delta machine could do this, without
it being incredibly large. I just can't imagine a delta
machine that can cover a 1 x 1 meter area, and do it rapidly
with a heavy head and great precision.
Jon
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