Camera position

[Oleg Mazurov]

Gentlemen,

I have a Neoden TM240A machine (the larger variant of TM220A) which I'm planning to convert to Openpnp control. I'm currently fitting a camera and have a question - where to put it for the best results? For example, the attached picture has been taken with the camera placed at the shortest possible distance showing TQFP32-0.5 package plus one pad of 0603 in the lower right corner. Is this a good distance for the camera or shall I place it farther away?

Thank you,

Oleg.

[Jason von Nieda]

Hi Oleg,

First, I am glad to hear you are interested in running the TM machine with OpenPnP. I think it's a solid machine that could really shine with better software. So, if you have any troubles along the way, please get in touch. I'd be happy to help.

For the camera: OpenPnP's vision support is fairly rudimentary at this point. After Maker Faire is over, improving vision support is going to be one of my primary focuses in the software.

I tell you this because I don't really have a great set of suggestions for camera placement just yet - that is something that will come with more experience for me.

What I can tell you is that the camera setup I have done all the development with is set up for 0.031mm per pixel in X and Y. On a 640x480 images this gives about a 19.8x14.8mm visible viewport. This size has worked very well for me, so you could consider that a recommendation for a focal distance.

Jason

--
You received this message because you are subscribed to the Google Groups "OpenPnP" group.
To unsubscribe from this group and stop receiving emails from it, send an email to openpnp+u...@googlegroups.com.
To post to this group, send email to ope...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/3c9f04c9-9bae-4fa4-8f5e-a05b7bd12923%40googlegroups.com?hl=en-US.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

[Oleg Mazurov]

Hi Jason,

The pictured package dimension between edges of opposite pads is ~7.5mm so I can raise the camera quite a bit. This is a good news since the camera will be able to see the laser pointer crosshairs which would be helpful even under default control. My guess is camera position against he head is not too critical as long as it's close, is this the correct assumption?

To the group - if anyone wants closeup pictures of the machine, just ask. At some point, I'm going to disassemble and reverse engineer the cover tape pickup mechanism - the plan is to build a second row of feeders on the right side of the machine.

Oleg.

[Jason von Nieda]

Oleg,

Camera position is independent of head/nozzle position. In the OpenPnP configuration you just specify the distance from the head to the camera and OpenPnP applies that as an offset when working with the camera. As far as OpenPnP is concerned, nozzles, cameras and actuators are just things attached to the head and each has an offset from the head. This allows OpenPnP to move any of those things to a specific position without having to know the details about how it's attached.

Also, if you are looking at the OpenPnP software currently, please look at the develop branch and not master. master is out of date and will be merged soon.

Jason

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/3b3c4bfe-a186-45bd-a0dd-1e8d4ae26317%40googlegroups.com?hl=en-US.

[Michael LaFleur]

What's the status of your project? I also have a TM-220A and think it could do much better.

Mike