Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


MPM Accuflex questions and issues

Views: 5582

#79753

MPM Accuflex questions and issues | 10 February, 2018

We recently acquired used MPM Accuflex. Immediately I noticed the live vision is mirrored. This makes it incredibly difficult to teach fiducials. I noticed some smudges on the lens, which leads me to believe the camera assembly was "worked on" at some point. Is this normal operation, or has this camera been put back together improperly? Also, often times we run into boards without fiducials. On our other printers we are able to teach components pads(such as both pads of an 0402). This does not seem possible with the Accuflex. It seems it will only accept a single pad for alignment fids. Am I correct on this observation? Any tips or tricks for alignment when boards are lacking fids?

reply »

#79757

MPM Accuflex questions and issues | 12 February, 2018

The piece that splits the vision probably has smudges or scratches on it.

You're able to teach a set of pads. Before teaching the fid, hit the "Draw Correlation Box" button (I think that's what it's called, it's been a couple years). Then draw a box around only the pads you want to use as fids. After drawing the box around the pads to use as fids, double click in the box and it will teach only what you have shown in the outlined box.

reply »

#79758

MPM Accuflex questions and issues | 12 February, 2018

Thanks for the reply. I will try that. So is it normal for the live vision to be a mirrored image of the board?

reply »

#79759

MPM Accuflex questions and issues | 12 February, 2018

I believe so, but I never noticed all that much. As long as your initial measurements entered to setup the program are accurate you shouldn't have to do much hunting for the fids.

reply »


dwl

#79760

MPM Accuflex questions and issues | 12 February, 2018

Yes, the vision system in the MPM accuflex, as well as on other MPM printers is reversed.

It's kind of weird but you get used to it.

reply »

#79761

MPM Accuflex questions and issues | 12 February, 2018

I see. As you say, Fid coordinates or good measurements should make it easier. 2d inspection setup at the machine may be a little more difficult. Thank you for the clarification. The Momentum's Vision is not inverted, it displays as if you are looking at the board.

reply »

#79771

MPM Accuflex questions and issues | 14 February, 2018

On AP machines it is possible to mount the camera 180 degrees out. Not sure if this can happen on Accuflex.

reply »

#79801

MPM Accuflex questions and issues | 15 February, 2018

Griinder, Maybe it's me, but I think what you might be saying here is that you see a reflected image of the PCB or Stencil when you and teaching the fiducials and it is interfering with the teaching routine, is that correct? If this is true it is common to see this reflection with the Accuflex. If it is so bad that you can't teach then there could be other things going on with the vision probe optics or the histogram setting of the camera. I will tell you that even if everything is working and calibrated correctly this is common with this platform. Make sure all the covers are in place and that you don't have an overhead light right above or directly in front of the machine.

Some clarity to the other comments made, all info provided is true, but let me add a little more detail. The Accuflex and all other older models of MPM (AP, UP2000, UP3000/Ultraflex, etc.) use an analog camera with a split prism optical array that allows the camera to see either up or down depending on which back light, board/stencil, is turned on. Due to this configuration it is possible to see both the stencil image and PCB image in the same view. This is also the reason why the video image on the monitor is inverted in the "Y" or up and down view, but not inverted in the "X" axis or side to side view. SR. mentioned that on an AP printer it is possible to loosen the camera and rotate it. This could actually be turned to any angle, but at 180 degrees the image on the screen would not be inverted in Y, but I think X would now be; this is not recommend. With the Accuflex you could physically do the same thing, but in this platform the camera is a wafer board camera and you would have to pull the camera out of the housing to rotate it; again this is not something you should do at all. The MPM Momentum series and Accela use a digital camera. The vision probe/optics work the same way as the other older models, but the software flips the image so it is not inverted; picture Vs. Live video. The way the lighting is controlled is also different, so it's apple and oranges!

Phil is correct in his description of teaching fids, but here's a bit more. In auto teach you double click on the fid and the software tries to figure out the best lighting settings, collect the image to store and calculate the edge definition to come up with centroid of the target. If it cannot do this it will say the object is not unique and might give you a list of similar objects found in the field of view. If all the other objects are 30-40% or lower the target will probably work, but it is better to make the target unique. Sometimes the software need help to figure out what you are trying to do. In this case you would select "manual" teach and now you are in control of the lighting and you can also use the "set Correlation box" to draw a box around you objects. So yes you can include other pads to make the object look unique, but what you have to do is then click on the actual pad you want to align to, even if it is not centered in the new correlation box you have drawn. IF you create a new box and click on the field instead of a pad/aperture, then the software tries the center the whole box. This will pass, but may compromise your alignment. So the box you draw is the image that the camera will look for when the PCB loads, once found the software will find the alignment target within the image. PCB and stencil pads/apertures much be the same target!!! The Momentum is the same way, but you size the boxes differently.

I hope find this info helpful!

reply »

#79901

MPM Accuflex questions and issues | 5 March, 2018

Would like to know if you were able to resolve this issue?

reply »

#79904

MPM Accuflex questions and issues | 6 March, 2018

Thank you guys for your help and detailed explanations. I have successfully been able to teach pads as fids. The camera view is very annoying, but manageable. Especially when teaching inspection positions. On the momentum's we can use Gerber EZ Teach to make inspection programs offline and import to machine. Is this possible with accuflex? 100% board inspection would take forever teaching each reference at the machine.

reply »

#79915

MPM Accuflex questions and issues | 7 March, 2018

Gerber EZ is not available on the Accuflex platform. Speedline (now ITW EAE), like most manufactures, do not want to offer new tools on old platforms. There is one feature in the AccuPro software that I don't believe was added in any version of the Benchmark software is the ability to turn off individual pads on an inspected device to reduce inspection cycle time. If you are looking for full PCB inspection this doesn't help, but for most users that want to use inspection, but to a minimum it is nice. For example you could teach a QFP, but you noticed that on this particular array you only have problems with 2 or 3 pads. Rather than deleting the taught QFP and just teaching those pads you can just turn off the rest of the pads you don't need to inspect. Then you can turn the whole thing back on or choose to include more pads or different ones. With a machine that inspects a little slower this can be a good time saver. The major difference in inspection time between the two platforms (Accuflex/Momentum) is the way inspection vision moves. With the Accuflex the camera moves around the taught device until all pads are captured where in the Momentum the motion is raster, jumping between devices and stitching the images back together. Momentum inspection can be even faster if the model of Momentum has servo drives for the vision motion system.

reply »

#79917

MPM Accuflex questions and issues | 7 March, 2018

I have some questions concerning 2d inspection on the momentum. Perhaps I'll start a new thread.

reply »

BGA Rework Services

StikNPeel™ Rework Stencils