X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.25.9.102] verified) by logan.com (CommuniGate Pro SMTP 5.1.6) with ESMTP id 1842714 for flyrotary@lancaironline.net; Fri, 16 Feb 2007 18:26:26 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-03.southeast.rr.com (8.13.6/8.13.6) with SMTP id l1GNPEUh001346 for ; Fri, 16 Feb 2007 18:25:14 -0500 (EST) Message-ID: <002501c75221$b9286860$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: SMD Printer Photo 2 Date: Fri, 16 Feb 2007 18:25:18 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0022_01C751F7.CFDFEF80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C751F7.CFDFEF80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Bill, there are a number of places that will make stencils - but = cheaper plastic ones a bit harder to find. You take a CAD drawing for your circuit board - most use DXF format but = they can be make from Gerber files (my Circuit Board drawing software = does not produce gerber files, but will export a DXF file). =20 I then eliminate anything in the DXF file that is not a pad or pin that = I want solder on. Then e mail the file to this company/guy. = http://www.pololu.com/ attn : Jan Malasek They use a laser to cut the = stencil based on your DXF file and ship it to you. Oh, they first send = you a PDF of the proposed stencil for one last check by you before = cutting the stencil. Here is the webpage that explains their process. = http://www.smtstencil.com/ The one I got matches even the 30 pins of a fine pitch socket with pins = only 0.25mm apart, so I was pleased. You can see some result of the = laser heat on the plastic so its not quite as clean as with a metal = stencil - but quite good for the price. =20 Ed ----- Original Message -----=20 From: Bill Schertz=20 To: Rotary motors in aircraft=20 Sent: Friday, February 16, 2007 4:52 PM Subject: [FlyRotary] Re: SMD Printer Photo 2 Ed, Very nice printer you made -- how do you get your stencils? Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Friday, February 16, 2007 2:55 PM Subject: [FlyRotary] Re: SMD Printer Photo 2 Hi Bill, To answer your question, Yes. And I am certain they can be made to = do the job. In fact, before the stencils arrived on the SMD scene, it = appears they used a "Mesh screen" which I understand is very close to = what the silkscreen printers do.=20 But, the "mesh screen" approach was limited by the smallest pitch of = pins they could resolve to, so they went to the stencil approach. With the solder paste method (from what I think I understand) = appears to require some consistency of pressure for best results. That = lead to my adjustable springs to put the squeegee under consistent = pressure - supposedly once I find that magic pressure setting then = consist good result will follow. Lots of ways to skin this cat. Ed ----- Original Message -----=20 From: wrjjrs@aol.com=20 To: Rotary motors in aircraft=20 Sent: Friday, February 16, 2007 3:41 PM Subject: [FlyRotary] Re: SMD Printer Photo 2 Ed, That looks like innovative and neat work. Now the apparatus = begs the question, have you ever looked at a standard silkscreen jig = from the art store to do the same job? The design you made is = considerably tougher, but some of the silkscreen machines are pretty = well framed using hardwood. FWIW (which probably aint much) Bill Jepson =20 -----Original Message----- From: eanderson@carolina.rr.com To: flyrotary@lancaironline.net Sent: Fri, 16 Feb 2007 11:19 AM Subject: [FlyRotary] SMD Printer Photo 2 This shows one of the two side mounts of my SMD solder paste = printer which is attached to the MSD nylon strip which rides in a groove = inside the cheap T track. The T track is simply screwed to the 1/2" = slab of aluminum. The acorn nut provides tension through a 1/4" threaded = rod and keeps the pull-handle gripped between the two sides and provides = tension on the side plate which puts side pressure on the MSD strip in = the T rail. More pressure makes the device slide slower and less makes = it faster. =20 The squeegee holder can pivot to either put the squeegee down on = the bed or to hold it up off of it after a solder run and you want to = move the squeegee holder back to the other original end of the board = without smearing your deposited paste. The second photo shows where the squeegee holder would be = positioned after a "solder-run" was made. I would then rotate the = squeegee up 1/8" inch out of contact with the bed and move it back to = the other (starting) end of the bed. Ed The message is ready to be sent with the following file or link = attachments: MVC-007F.JPG Note: To protect against computer viruses, e-mail programs may = prevent sending or receiving certain types of file attachments. Check = your e-mail security settings to determine how attachments are handled.=20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ [Image Removed]=20 [Image Removed]=20 -------------------------------------------------------------------------= - Check out the new AOL. Most comprehensive set of free safety and = security tools, free access to millions of high-quality videos from = across the web, free AOL Mail and more. ------=_NextPart_000_0022_01C751F7.CFDFEF80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Bill, there are a number of places = that will=20 make stencils - but cheaper plastic ones a bit harder to = find.
 
You take a CAD drawing for your circuit = board -=20 most use DXF format but they can be make from Gerber files (my Circuit = Board=20 drawing software does not produce gerber files, but will export a DXF=20 file). 
I then eliminate anything in the DXF = file that is=20 not a pad or pin that I want solder on.  Then  e mail = the  file=20 to this company/guy.  http://www.pololu.com/  &nb= sp;attn :=20 Jan Malasek  They use a laser to cut the stencil based on your DXF = file and=20 ship it to you.  Oh, they first send you a PDF of the proposed = stencil for=20 one last check by you before cutting the stencil.
 
Here is the webpage that explains their = process.   http://www.smtstencil.com/=
 
The one I got matches even the 30 pins = of a fine=20 pitch socket with pins only 0.25mm apart, so I was pleased.  You = can see=20 some result of the laser heat on the plastic so its not quite as clean = as with a=20 metal stencil - but quite good for the price. 
 
 
Ed
----- Original Message -----
From:=20 Bill=20 Schertz
Sent: Friday, February 16, 2007 = 4:52=20 PM
Subject: [FlyRotary] Re: SMD = Printer=20 Photo 2

Ed,
Very nice printer you made -- how do you get = your=20 stencils?
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
Sent: Friday, February 16, = 2007 2:55=20 PM
Subject: [FlyRotary] Re: SMD = Printer=20 Photo 2

Hi Bill,
 
To answer your question, Yes.  = And I am=20 certain they can be made to do the job.  In fact, before the = stencils=20 arrived on the SMD scene, it appears they used a "Mesh screen" which = I=20 understand is very close to what the silkscreen printers do. =
 
But, the "mesh screen" approach was = limited by=20 the smallest pitch of pins they could resolve to, so they went to = the=20 stencil approach.
 
With the solder paste method (from = what I think=20 I understand) appears to require some consistency of pressure for = best=20 results.  That lead to my adjustable springs to put the = squeegee under=20 consistent pressure - supposedly once I find that magic pressure = setting=20 then consist good result will follow.
 
Lots of ways to skin this = cat.
 
Ed
----- Original Message ----- =
From:=20 wrjjrs@aol.com=20
To: Rotary motors in = aircraft=20
Sent: Friday, February 16, = 2007 3:41=20 PM
Subject: [FlyRotary] Re: = SMD Printer=20 Photo 2

Ed, That looks like innovative and neat work. Now the = apparatus begs=20 the question, have you ever looked at a standard silkscreen jig = from the=20 art store to do the same job? The design you made is considerably = tougher,=20 but some of the silkscreen machines are pretty well framed using=20 hardwood.=20 FWIW (which probably aint much)
Bill Jepson
 
 
-----Original Message-----
From:=20 eanderson@carolina.rr.com
To: = flyrotary@lancaironline.net
Sent: Fri,=20 16 Feb 2007 11:19 AM
Subject: [FlyRotary] SMD Printer Photo = 2

This shows one of the two side mounts of = my SMD=20 solder paste printer which is attached to the MSD nylon strip = which rides=20 in a groove inside the cheap T track.  The T track is simply = screwed=20 to the 1/2" slab of aluminum. The acorn nut provides tension = through a=20 1/4" threaded rod and keeps the pull-handle gripped between the = two sides=20 and provides tension on the side plate which puts side pressure on = the MSD=20 strip in the T rail.  More pressure makes the device slide = slower and=20 less makes it faster. 
 
The squeegee holder can pivot to either = put the=20 squeegee down on the bed or to hold it up off of it after a solder = run and=20 you want to move the squeegee holder back to the other original = end of the=20 board without smearing your deposited paste.
 
The second photo = shows where=20 the squeegee holder would be positioned after a "solder-run" was=20 made.  I would then rotate the squeegee up 1/8" inch out of = contact=20 with the bed and move it back to the other (starting) end of the=20 bed.
 
Ed
 
 
The message is ready to be sent with the = following file=20 or link attachments:
MVC-007F.JPG

Note: To protect = against=20 computer viruses, e-mail programs may prevent sending or receiving = certain=20 types of file attachments.  Check your e-mail security = settings to=20 determine how attachments are handled.

[Image = Removed]=20
[Image = Removed]=20
Check out the new AOL. Most = comprehensive set of=20 free safety and security tools, free access to millions of = high-quality=20 videos from across the web, free AOL Mail and=20 more.
------=_NextPart_000_0022_01C751F7.CFDFEF80--