Thread View: sci.electronics.design
14 messages
14 total messages
Started by David L. Jones
Fri, 17 Apr 2009 13:21
Melted Connector
Author: David L. Jones
Date: Fri, 17 Apr 2009 13:21
Date: Fri, 17 Apr 2009 13:21
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Here is what happens when you try and reflow cheap OneHungLow brand header connectors: http://www.alternatezone.com/images/MeltedConnector.JPG Temperature profile peak was only 265 degC. Dave.
Re: Melted Connector
Author: TTman
Date: Fri, 17 Apr 2009 13:34
Date: Fri, 17 Apr 2009 13:34
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"David L. Jones" <altzone@gmail.com> wrote in message news:Bn%Fl.17639$g%5.15000@newsfe23.iad... > Here is what happens when you try and reflow cheap OneHungLow brand header > connectors: > http://www.alternatezone.com/images/MeltedConnector.JPG > Temperature profile peak was only 265 degC. > > Dave. > > That must have been really ,really cheap...... You sure it's 265 ?? what about the pre-heat?
Re: Melted Connector
Author: Mark Kelepouris
Date: Fri, 17 Apr 2009 14:59
Date: Fri, 17 Apr 2009 14:59
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"TTman" <someone.pc@ntlworld.com> wrote in message news:1A%Fl.43133$cX1.13834@newsfe28.ams2... > > "David L. Jones" <altzone@gmail.com> wrote in message > news:Bn%Fl.17639$g%5.15000@newsfe23.iad... >> Here is what happens when you try and reflow cheap OneHungLow brand >> header connectors: >> http://www.alternatezone.com/images/MeltedConnector.JPG >> Temperature profile peak was only 265 degC. >> >> Dave. >> >> > That must have been really ,really cheap...... You sure it's 265 ?? what > about the pre-heat? > My only explanation for this kind of thing happening, would be that (it's possible!) a pack of Crayons fell into the plastic mixture at the Chinese manufacturing plant. ;) Mark Kelepouris
Re: Melted Connector
Author: linnix
Date: Fri, 17 Apr 2009 15:37
Date: Fri, 17 Apr 2009 15:37
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On Apr 17, 6:21 am, "David L. Jones" <altz...@gmail.com> wrote: > Here is what happens when you try and reflow cheap OneHungLow brand header > connectors:http://www.alternatezone.com/images/MeltedConnector.JPG > Temperature profile peak was only 265 degC. > > Dave. Regardless of the temperature, I would put jumper blocks on them first and discard them later. The jumper blocks should hold it in place and shield the metal, which draw heat faster than plastic.
Re: Melted Connector
Author: TTman
Date: Fri, 17 Apr 2009 16:26
Date: Fri, 17 Apr 2009 16:26
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"linnix" <me@linnix.info-for.us> wrote in message news:93f44a0f-b169-49ac-b11f-65b2c621325c@d19g2000prh.googlegroups.com... On Apr 17, 6:21 am, "David L. Jones" <altz...@gmail.com> wrote: > Here is what happens when you try and reflow cheap OneHungLow brand header > connectors:http://www.alternatezone.com/images/MeltedConnector.JPG > Temperature profile peak was only 265 degC. > > Dave. Regardless of the temperature, I would put jumper blocks on them first and discard them later. The jumper blocks should hold it in place and shield the metal, which draw heat faster than plastic. I never have to do that,and I use both single and dual pin strip headers..... Lead free, flow soldered, 267 C , preheat 45 seconds @ 330C over hotplate, 1.2 M/sec
Re: Melted Connector
Author: Eeyore
Date: Fri, 17 Apr 2009 17:28
Date: Fri, 17 Apr 2009 17:28
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"David L. Jones" wrote: > Here is what happens when you try and reflow cheap OneHungLow brand header > connectors: Who does your purchasing or sub-contracting ? OneHungLow indeed ! Graham
Re: Melted Connector
Author: L.A.T.
Date: Fri, 17 Apr 2009 19:16
Date: Fri, 17 Apr 2009 19:16
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"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message news:49E8BC34.937FB158@hotmail.com... > > > "David L. Jones" wrote: > >> Here is what happens when you try and reflow cheap OneHungLow brand >> header >> connectors: > > Who does your purchasing or sub-contracting ? OneHungLow indeed ! > > Graham Most of these components come from The Bung Thing Manufacturing Company.
Re: Melted Connector
Author: langwadt
Date: Fri, 17 Apr 2009 23:56
Date: Fri, 17 Apr 2009 23:56
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On 17 Apr., 18:26, "TTman" <someone...@ntlworld.com> wrote: > "linnix" <m...@linnix.info-for.us> wrote in message > > news:93f44a0f-b169-49ac-b11f-65b2c621325c@d19g2000prh.googlegroups.com... > On Apr 17, 6:21 am, "David L. Jones" <altz...@gmail.com> wrote: > > > Here is what happens when you try and reflow cheap OneHungLow brand header > > connectors:http://www.alternatezone.com/images/MeltedConnector.JPG > > Temperature profile peak was only 265 degC. > > > Dave. > > Regardless of the temperature, I would put jumper blocks on them first > and discard them later. The jumper blocks should hold it in place and > shield the metal, which draw heat faster than plastic. not much point in machine assembly if you have to manually put on jumper blocks and such .... > > I never have to do that,and I use both single and dual pin strip > headers..... Lead free, flow soldered, 267 C , preheat 45 seconds @ 330C > over > hotplate, 1.2 M/sec -Lasse
Re: Melted Connector
Author: David L. Jones
Date: Sat, 18 Apr 2009 00:49
Date: Sat, 18 Apr 2009 00:49
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"linnix" <me@linnix.info-for.us> wrote in message news:93f44a0f-b169-49ac-b11f- >Regardless of the temperature, I would put jumper blocks on them first >and discard them later. The jumper blocks should hold it in place and >shield the metal, which draw heat faster than plastic. No need to do that for every other brand on the market, they survive quite nicely just like they are designed to do. Dave.
Re: Melted Connector
Author: David L. Jones
Date: Sat, 18 Apr 2009 00:52
Date: Sat, 18 Apr 2009 00:52
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"TTman" <someone.pc@ntlworld.com> wrote in message news:1A%Fl.43133$cX1.13834@newsfe28.ams2... > > "David L. Jones" <altzone@gmail.com> wrote in message > news:Bn%Fl.17639$g%5.15000@newsfe23.iad... >> Here is what happens when you try and reflow cheap OneHungLow brand >> header connectors: >> http://www.alternatezone.com/images/MeltedConnector.JPG >> Temperature profile peak was only 265 degC. >> >> Dave. >> >> > That must have been really ,really cheap...... You sure it's 265 ?? what > about the pre-heat? Yep, that figure comes direct form the board loader who were monitoring the temp as part of an initial pre-production run, it includes pre-heat. Dave.
Re: Melted Connector
Author: David L. Jones
Date: Sat, 18 Apr 2009 00:52
Date: Sat, 18 Apr 2009 00:52
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"Mark Kelepouris" <markkelly2@bigpond.com> wrote in message news:HP0Gl.4220$y61.3703@news-server.bigpond.net.au... > > "TTman" <someone.pc@ntlworld.com> wrote in message > news:1A%Fl.43133$cX1.13834@newsfe28.ams2... >> >> "David L. Jones" <altzone@gmail.com> wrote in message >> news:Bn%Fl.17639$g%5.15000@newsfe23.iad... >>> Here is what happens when you try and reflow cheap OneHungLow brand >>> header connectors: >>> http://www.alternatezone.com/images/MeltedConnector.JPG >>> Temperature profile peak was only 265 degC. >>> >>> Dave. >>> >>> >> That must have been really ,really cheap...... You sure it's 265 ?? what >> about the pre-heat? >> > > My only explanation for this kind of thing happening, would be that (it's > possible!) a pack of Crayons fell into the plastic mixture at the Chinese > manufacturing plant. ;) I think you are right on the money! Dave.
Re: Melted Connector
Author: David L. Jones
Date: Sat, 18 Apr 2009 00:55
Date: Sat, 18 Apr 2009 00:55
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"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message news:49E8BC34.937FB158@hotmail.com... > > > "David L. Jones" wrote: > >> Here is what happens when you try and reflow cheap OneHungLow brand >> header >> connectors: > > Who does your purchasing or sub-contracting ? OneHungLow indeed ! Mostly in-house purchasing, but I don't know who's responsible for this one. We usually use Samtec headers. Dave.
Re: Melted Connector
Author: Eeyore
Date: Sat, 18 Apr 2009 15:33
Date: Sat, 18 Apr 2009 15:33
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"David L. Jones" wrote: > "Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote > > "David L. Jones" wrote: > > > >> Here is what happens when you try and reflow cheap OneHungLow brand > >> header > >> connectors: > > > > Who does your purchasing or sub-contracting ? OneHungLow indeed ! > > Mostly in-house purchasing, but I don't know who's responsible for this one. > We usually use Samtec headers. Never had a problem with Samtec for sure. Sometimes engineers have to fight a battle with purchasing. I foresaw a problem with a particular component on a �750,000 contract some 20 years ago and pressurised purchasing in the presence of board members to give extra lead time for these, since we hadn't ordered that specific model in ages. Did they ? Hell no ! It resulted in the ONE problem with project completion, dealines and in-field reliability. Graham
Re: Melted Connector
Author: Rich Grise
Date: Mon, 20 Apr 2009 19:01
Date: Mon, 20 Apr 2009 19:01
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On Sat, 18 Apr 2009 16:33:43 +0100, Eeyore wrote: > "David L. Jones" wrote: >> "Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote >> > "David L. Jones" wrote: >> > >> >> Here is what happens when you try and reflow cheap OneHungLow brand >> >> header >> >> connectors: >> > >> > Who does your purchasing or sub-contracting ? OneHungLow indeed ! >> >> Mostly in-house purchasing, but I don't know who's responsible for this >> one. We usually use Samtec headers. > > Never had a problem with Samtec for sure. Sometimes engineers have to > fight a battle with purchasing. I foresaw a problem with a particular > component on a �750,000 contract some 20 years ago and pressurised > purchasing in the presence of board members to give extra lead time for > these, since we hadn't ordered that specific model in ages. > > Did they ? Hell no ! It resulted in the ONE problem with project > completion, dealines and in-field reliability. Many years ago, I worked for a plastics extruder, who got a contract to make the plastic things that the customer then stuffed with pins. They searched for WEEKS to find a plastic that could be extruded for less than a king's ransom, yet still meet fire specs. The term 94V0 springs to mind, but I couldn't swear to it. The plastic wasn't glass-filled - it was some variety of vinyl, IIRC, but nothing was ever said about melting in service; it was extruded at about 450 F, at which temp. it was still quite stiff. The customer was happy with the result, but these were through-hole headers, if that has anything to do with it. Cheers! Rich
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