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Messages - slavka012

6
Tools of the trade / Re: SMT700 New vision based SMT machine from SMALLSMT
Vision actually works quite well. It locates fiducials and correct components very consistently.

Certain things are implemented stupidly in s/w. For example I was populating 5mm tall switches, and very rarely it would drop it while en route. It has pressure sensor and detects that. But instead of stopping immediately it tries to to go discard location. Now, if the button is dropped onto the feeder, it is now blocking the movement of the head. It is just nasty when it tries to move over the switch.

Pressure sensor lacks adjustment. Certain resistors are not detected by it, even though visually they are picked correctly.
7
Tools of the trade / Re: SMT700 New vision based SMT machine from SMALLSMT
Well ok I now had an opportunity to work with TVM802B for some time. Right now my biggest issue with the machine is the peeling mechanism. It sucks tremendously.

If you are buying this machine, plan on scrapping it and building a new peeling mechanism. The one they have is extremely unreliable. See, it depends on the friction in the roller to be set precisely. Too little, and it is not enough force to peel the cover tape. Too much, and it pulls through the carrier tape. The problem is, even if you adjust it to just perfect tension, it does not stay at that level. So once in a while the same tape might sometimes not peel, or sometimes pull too much.

in my recent run 2 out of 20 feeders could not be adjusted to reliable operation.
8
Tools of the trade / Re: High speed Pick & Place for $3600
You can sort the parts accordingly in order to overcome the low clearance problem.

I'll try to explain: put all tall components to the end of the list. And once it starts to place tall components, make sure it populates locations FARTHEST from the pick up location first. This way, once tall component is placed, the head will never have to go over that location again.

Depending on how close the mounting head is to being at -10mm when it touches the PCB, you might be able to place components up to 9mm high.
9
Tools of the trade / Re: SMT700 New vision based SMT machine from SMALLSMT
I ended up buying TVM802B. Very solid construction, but there are some annoying limitations, mostly imposed by the s/w that runs on the PC. The good thing though is that the machine is almost entirely controlled from the PC over Ethernet. I already looked at the protocol and it seems to be reasonably easy to decipher. I'm going to write a new s/w for the machine to make it really usable.

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