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I will not use Steel, it is way to heavy.Just if it is still to expensive i will reduce the thickness of the aluminium plates to 5 mm.I have a company nearby that can laser-cut aluminum plates up to a thickness of 10mm with an accuracy of +/- 0.1mm without problems.Since I don't need an exact fit for the parts, that's perfectly adequate for me. I drew the threaded holes all with a 0.5 mm smaller diameter.I then drill this on the column drill to the core diameter and cut the thread into it myself.I can make the four fitting surfaces on the parts with the manual milling without any problems.So now I hope that laser cutting is significantly cheaper than milling.
Hi Christian
> this tank is also controlled by an air pressure sensor, which opens the tank when the pressure exceeds, for example, 200 mbar in order to avoid a loss of performance of the pump
So you run the pumps all the time?
Why not run them on a hysteresis to keep the tank
pressurized to a certain level?
https://makr.zone/vacuum-sensor/192/
_Mark
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> I made some tests with different juki nozzles and I found that for large nozzles, vacuum difference is large and vacuum level with open circuit is quite close to 0, but with small nozzles there is significant vacuum level present even with the part off, that's because of the flow restriction induced by the small channel of the nozzle. Iirc, around 400mbar with a 501 nozzle and no part attached.
Have you found a solution for that problem?
I tried to improve the OpenPnP vacuum system with relative
measurements etc. but while this greatly improved sensing for the
other nozzle tips, even these enhancements did not fix
the problem for the finest nozzle tip (0402). There is no
conclusive threshold that has neither false positives nor false
negatives:
https://makr.zone/openpnp-advanced-vacuum-sensing-part-on-part-off-detect/421/
I guess for that nozzle tip one would have to build a switchable
flow restriction behind the vacuum sensor.
_Mark
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And here is the construction of the placement head:
And here is a photo of the machine showing the current production progress:
I still have to manufacture all machine parts that are still missing, which unfortunately will still take some time. Mainly because my CNC milling machine was unfortunately struck by lightning and I need to repair it first.I am always open to discuss suggestions for improvement.AND YES, if anyone wants them, I can provide the construction files ;)By the way, if someone can produce 8mm aluminum milling parts for little money and get it shipped cheaply to Austria, please contact me :-) (I still need the three aluminum plates from the assembly head ... but - as you already know - my milling machine is dead at the moment)So, hope you like it.Best regards,Christian
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On 16 Jan 2022, at 12.22, Christian...@gmx.at <Christian...@gmx.at> wrote:
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On 16 Jan 2022, at 14.13, Christian...@gmx.at <Christian...@gmx.at> wrote:
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