SMT460 PnP Camera Understanding

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IF YOU KNOW OF OR HAVE AN SMT-XXX MODEL PnP maybe you can he... - Jul 04, 2024 by Chuckphd53

I don't know who manufactures the SMT 460 machine or what it... - Jul 04, 2024 by Assured-Tech

Found a Solution: Seems that I was told my Jim Jiang, (mach... - Jul 10, 2024 by Chuckphd53

Chuckphd53

#91123

SMT460 PnP Camera Understanding | 4 July, 2024

IF YOU KNOW OF OR HAVE AN SMT-XXX MODEL PnP maybe you can help!

We have an SMT460, basically a good machine but does have some quirks.

I'd like to get a few answers to help solve an SOT23 part placement issue. With High speed camera selected for these parts (10Each) on the board it will pick the part, camera scan (I assume for true part pick up, not orientation) and move to board and place part. ALWAYS it will skew a few of the SOT23 parts left or right of proper placement with no consistance, while placing the others properly. As an experiment I turned OFF the High speed camera and every time the part would be place exactly proper, no offest at all. I was under the assumption that the HS camera was only for part pick up validity, not orientation!

Also in the camera settings there are a few settings that the documentation has ignored clarity and exhaustive seaching has not proven fruitfull.

here are the items The topics need clarification please: How does changing each value benefit or not each function?

Clr Threshold-127 (Image Limit Value) what is this, how does the setting change operation. (typically this is set to midpoint, I assume 0-255, but there is never any defined understanding of how it is implemented or used)

Pixel Ratio -xxx 0.86 Assuming this is the camera vision but what is it's function...

Camera Delay -xxx 50 What exactly is the delay for ? viewing, etc ??

Wondering why turning OFF the camera places parts correctly? this has validated that the PnP of the part mechanically is good, but the camera is adding a 'rotation' to the placement. So the vision, must be looking at the part, and since it is a 3 leg device and small it is having a hard time with identification?

Lastly, all the 805/1206 etc parts are place correctly with the HS camera, turned on....

This has been an issue for a while, and itching to better understand it and how to experiment with the camera settings to maybe figure this out.

As a last note, the LED lighting is set to nominal and the 0805 parts are placed correctly. so I suspect the three legs of the SOT23 may be the culprit..... thanks in advance guys I know there is alot of talent and experience here that can chime in.

chuck

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Assured-Tech

#91124

SMT460 PnP Camera Understanding | 4 July, 2024

I don't know who manufactures the SMT 460 machine or what it's capabilities and configuration or machine settings are applicable to this topic but some common process of eliminations are: Component packages (doesn't seem to be an issue here), Board support tooling, PAD stack - size of the component leads vs the PAD's on the board, Vacuum, Nozzle size and type (i.e. larger nozzle and maybe with a compliant rubber tip, if a Multiple Spindle Placing Head try different spindles, High speed vision might be using a traverse motion ( an archway / curved motion from the camera to the board) instead of straight up, scan, stays up and places straight down, consistency of the component being supplied from the manufacturer. If on a inline conveyor machine, is it skewed at placement inside of the machine at the X/Y table or after the machine transfers the board, solder paste management / environment. Importing good CAD data or Teaching board / component data, Does the board have good fiducials / design for manufacturability (DFM), Machine leveling, Is it being placed within IPC spec's? Slower placement = no touch up work by the Operator, I'd avoid machine setting changes until all variables are considered. Cheers and good luck.

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Chuckphd53

#91138

SMT460 PnP Camera Understanding | 10 July, 2024

Found a Solution: Seems that I was told my Jim Jiang, (machine Sales) at Wenzhou Yingxing Technology Co.,Ltd

that the High speed camera 'image Threshold' value set to 127 should not be changed.. Turns out that with the smaller parts need this to be 'lowered' so that it will correcty identify and place the identification rectangle around that part for proper placement. I dropped my to 10 and it worked but settled on 25 as the final value...

After changing this and adjusting the LED brightness just a little, I ran 35 board thru the PnP and each was perfect. all parts were placed exact !.

My advice with these SMTxxx type machines is to play with the setting to better understand what is missing from the manuals which tend to be vague at best...

Hope this helps other, let me know if you have any other question I might be able to help...

Chuck

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