Electronics Forum | Thu Mar 15 17:50:18 EDT 2018 | sarason
Possibly a loose grub screw on one of the shafts controlling rotation or the sensor ot gray code wheel on the rotation servo motor. or even a small fault in the program eprom, Good luck sarason
Electronics Forum | Thu Mar 15 18:18:36 EDT 2018 | maustin
Yep, checked the nozzle (that was my first port of call). Had a look at it under our microscope, and also swapped it out for another nozzle to be sure. The problem still exists. You can set the theta speed, but only to Fast, Medium or Slow. I've
Electronics Forum | Thu Mar 15 18:21:26 EDT 2018 | maustin
Cheers. I have a suspicion its an error with whatever part of the machine measures shaft rotation, but the grub screw thing is an easy one to check and eliminate. I'm only guessing from what I can see, but it looks like its setting the component at
Electronics Forum | Thu Mar 15 01:43:52 EDT 2018 | reckless
Unfortunately, I can't give any help but wanted to ask about your experience with the 740 machine? How reliable has it been for you? Would you buy another or upgrade to newer machine? I just bought 2 pm570s arriving tomorrow. If they work out wel
Electronics Forum | Thu Mar 15 12:36:04 EDT 2018 | deanm
Is the nozzle in good condition? If it is not flat because of damage or wear, it might loose vacuum and the part may have a tendency to shift. I don't have experience with these machines but how do you know the spindle is spinning slower when the co
Electronics Forum | Tue Mar 13 19:27:33 EDT 2018 | maustin
I have an old Zevatech 740 machine that, until recently, was running well. In the last few weeks, the RH head has started giving me issues. When it picks up a component (and early on in most of my programs it will be picking up chip resistors or ca
Electronics Forum | Thu Mar 15 18:15:28 EDT 2018 | maustin
The 740 has been a great machine for us. We've been able to reliably load components as small as 0603 (we've not tried 0402, but I believe with a special nozzle adaptor, you can get it to work) and place a 7x7 56 pin QFN with 0.4mm pin pitch with hi
Electronics Forum | Tue Mar 20 22:53:16 EDT 2018 | maustin
OK, with my masterful powers of deduction, I have been able to resolve the problem. Upon further investigation, it became apparent that the issue was restricted to those components that had the laser alignment level in the component data set to -0.2
Electronics Forum | Thu Feb 27 14:02:26 EST 2003 | russ
Genny you are right on with the differences between suppliers/packaging etc... I am a CEM and you are correct that we pay no heed to cad rotations from our customers/designers. A.V.L./manufacturers P/Ns information specifies orientations and such.
Electronics Forum | Thu Feb 27 11:23:18 EST 2003 | russ
Machine rotation is usually based off of component presentation. for example an SO8 can come in either tape and reel and sticks. In tape and reel the component is presented to the machine with pin one at the lower left corner while the stick will hav
