Electronics Forum | Wed Jul 13 08:46:15 EDT 2005 | james
Does anyone else have problems with the frameless stencils on the MPM UP2500. I noticed after I do a stencil height adjustment it looks like the vacuum actually pulls the stencil to the board.
Electronics Forum | Wed Jul 13 09:01:48 EDT 2005 | dougs
if your vacuum is getting through your board then it sounds like your vacuum tooling is wrong. you shouldn't have vacuum points at areas of the board where there are PTH's or via's.
Electronics Forum | Wed Jul 13 10:43:16 EDT 2005 | james
I dont have much choice because the vaccuum is right underneath the whole board, it sucks the board fairly hard. The only thing holding the board is the vacuum and board supports.
Electronics Forum | Wed Jul 13 13:35:07 EDT 2005 | chunks
Maybe you stencil height measurement is being affected. Check your tactile sensor, it may be sticking due to paste or adhesive getting on it.
Electronics Forum | Wed Jul 13 15:18:50 EDT 2005 | pr
Sounds like your stencil might not be tight enough. Are you having print problems because of this? If not I wouldn't be too worried about it. good luck, pr
Electronics Forum | Thu Jul 14 07:59:33 EDT 2005 | james
The tactile sensor seems to be fine. I think it may have something to do with the stencil being not as tight as to one that is on a stainless steel frame. When we set the height of the stencil we have to do it towards the back of the stencil becaus
Electronics Forum | Thu Jul 14 12:11:58 EDT 2005 | geb
The vacuum will pull the stencil towards it if there isn't a frame because the front and back of the stencil aren't being supported by anything. Can't you use a frame, they're only about �20.
Electronics Forum | Thu Jul 14 14:30:33 EDT 2005 | pr
The big advantage of frameless is storage space. The big disadvantage is getting the stencil tight (and cuts on operators). pr
Electronics Forum | Thu Jul 14 15:31:55 EDT 2005 | jdengler
This is why I disqualified frameless stencils. All that I have seen do not seem to be tight enough. Introducing 1 more variable into screen printing did not seem like a good idea. Jerry
Electronics Forum | Mon Jul 18 01:47:29 EDT 2005 | Cal
I would suggest 1) Use the profile that is suggested with the BGA types you are using or 2) Have you solder paste rep visit for a half day and help profile your machine. Remember if they want to keep you as a paste customer they will help. Enjoy,
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