Electronics Forum | Fri Apr 02 22:01:19 EST 1999 | Dean
| Anyone knows what is the optimum squeegee angle for screen printers. | | 45 Degrees. The forward velocity creates a downward pressure equal to the vector pressure (equalibrium). This is commonly known as paste "rolling action". Too obtuse an an
Electronics Forum | Tue Apr 06 10:30:48 EDT 1999 | Scott Davies
Tony Although I agree in principle with Dean that 45 Degrees would be ideal, most of the squeegees I have worked with have been 60 Degrees to the stencil surface. This seems to work best with metal squeegees when printing HASL boards, because the sl
Electronics Forum | Wed Apr 07 11:42:16 EDT 1999 | Tony A
| Tony | | Although I agree in principle with Dean that 45 Degrees would be ideal, most of the squeegees I have worked with have been 60 Degrees to the stencil surface. This seems to work best with metal squeegees when printing HASL boards, because
Electronics Forum | Thu Jun 14 11:43:52 EDT 2001 | gsmguru
Change times for the Rheo pump are probably a little slower than just swapping blades. You have to hook up the sensors & air lines,remove the bottom cover + charge the pump to get it to operating pressure before you can print. I would guess that if y
Electronics Forum | Mon Jun 27 11:24:03 EDT 2005 | russ
What size paste roll do you have on your stencil? It should be about 1/2" in diameter. What type of paste are you using? I have found that certain Mfgrs have this problem with some of their formulations. What typoe of printer and what is your squ
Electronics Forum | Thu Feb 14 13:10:58 EST 2013 | markhoch
I had this problem once a loooooooong time ago with a 248 that was at my previous place of employment. If I remember correctly, my issue was caused by a set screw on the drive gear that had worked itself loose. My issue was stright forward and quickl
Electronics Forum | Wed Jun 13 16:56:19 EDT 2001 | gsmguru
The only ones we've tried so far are Indium SMQ92 & AIM NC251 + one from Sinju (SP ?) that I can't remember the Part # for. They all printed fairly well. The pump seems to be a bit more forgiving than traditonal blades. The Rheo pump may mask some pa
Electronics Forum | Thu Jun 14 10:50:38 EDT 2001 | Dave G
Are you changing heads because of pastes or just changing widths ? Changing the head w/o cleaning is fairly straight forward. (Actually it's Pretty easy.) We have two widths - 8" & 12". We switch twice a day with very few problems but, we don't have
Electronics Forum | Wed Jun 13 21:25:48 EDT 2001 | dougk
We've tried the MPM rheo., with excellent results. We saw a decrease in fine-pitch pad coverage rejects from ~20% to bacicially ~0%. Print speeds went from 1-2 in/sec (metal blade) to 4-5 in/sec (rheo.). Could probably go faster. Great throughput. Li
Electronics Forum | Thu Apr 12 08:14:43 EDT 2018 | cyber_wolf
The way to determine correct pressure (in my experience) is to start out at what you would consider to be a low sq. pressure setting. You are looking for it to leave a slight film of paste on the stencil. Start increasing pressure in small incremen
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