Hi,
I'm trying to optimize the printing results of the dispenser mode. At this point I'm wondering about the parameters "Dispenser open", "Dispenser close", "After close". Can you please give an explanation about that values, because I cannot find anything in the manual. Thank you!|addpics|pp9-3-1ae7.png|/addpics|

Hi,
still trying to optimize the printing results with solder paste, or clearly, to achieve an acceptable result at all.
When I'm moving the head manually to a pad position in XYZ, and double click the vaccum button somewhat fast, I get a wonderful small dot (see attached iamge).

But when I programm the machine to do this automatically, the dots look very shaken and deformed (see second image). Good results with different dispenser opening times cannot be achieved repeatedly over several runs. It seems like the valve is opened/closed during movement of the head.

I would like something like that:
1. Move head to location XY
2. Move head down
3. Wait (time t1)
4. Open dispenser (time td)
5. Close dispenser
6. Wait time (t2)
7. Move head up

Right know I'm able to adjust the dispenser-open time and another intervall controlling the time of head stays in top position. Can you please explain the sequence of the printing process. What are the delay times before opening and closing the valve, how long stands the head in a motionless down-position?
Thanks.


|addpics|pp9-4-710b.jpg,pp9-5-3070.jpg|/addpics|

Hi,
the instructions you provided helped to improve printing reults. Right now I'm able to print small dots with the 0.3mm needle, but major problem is that is not repeatable over a large number of dots. For example, when printing a dot array of more than 100 dots, at least 1 pad is not covered with solder paste.
Next step will be to test with different solder paste. Have you any suggestions regarding solder paste? Of course it must be Pb free.
By the way, a filled standard 10cc syringe did not fit into the solder paste dispenser. We have to refill the paste into the supplied syringes...

Yes, I would like to try with different pastes. May be that one I use is not the best for 0.3 nozzle. Bigger nozzles will of course reduce problems, but I need very small dots, and I guess it will be possible with the right setup and paste.

The easiest way would be to test standard pastes. But as I said, these do not fit into the holder. The mess with refilling is time consuming for testing different types. Attached is a picture showing the discrepancy between two cartridges. It is not that much, but the holder is definitely too tight.
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Hi,
sorry for late reply (due to holidays)...
The supplied syringe has diameter of about 17.7mm. Prefilled standard syringes we want to use have diameters of up to 19.6mm. I would be very happy about a revision of the holder.