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Re: DIY Toaster Reflow oven
I also have a comment about the preheat. It is usually dependent on the type of flux used in the solder paste. But all my experience with it was that the preheat is needed to ACTIVATE the flux, not just drive out the volatile out of the paste. And to do that, preheat was more like 130 degrees C.
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Usually, the part data sheet include a typical solder profile, but the solder paste provider might have a better one. Like you said, peak temperature should be 30 seconds around 215 degrees C. Cool down is always as fast as you can, but you need to stay below the stress limit for the component which is around 2 degrees per second. Just my two cents, Jean-Paul N1JPL On May 27, 2020, at 3:05 PM, Harvey Altstadter <hrconsult@...> wrote: |
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Re: DIY Toaster Reflow oven
After looking at your profile, i cave a comment or two.
Preheat to 100°C is a good idea to drive off the volatiles in the paste. This will lessen the possibility of boiling flux causing the part to move, will also reduce the formation of solder balls. Heating to 450°C is much too high. Tin Lead eutectic solder melts at 183°C, and normal soldering temperature should be around 215° to 220°C. The profiles on the manufacturer datasheet are set up for belt furnace soldering. In that process, the board is on a steel belt that moves at precise speed through several tightly controlled temperature zones. The belt speed and the zone length determine the dwell time at each temperature. That said, I would guess that trying to get that type of profile in a reflow oven would be difficult. I am thinking that the thermal response would be too slow. Preheat and cool down would probably be better served outside the oven on a hotplate. Harvey (the other one) Altstadter |
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Re: DIY Toaster Reflow oven
Using the subject of your message post in Google, I found this DIY project:
It appears to be a pretty complete project, includes all of the necessary design files for having the PCB made, the source and binary code for programming the controller, how to modify the toaster oven, etc. ?Seems to be a pretty complete project. ? The author doesn't specify which oven he used, but did say the oven was a 1300 watt unit. ?I'd suggest that you choose an oven that has a cavity that's appropriately sized for the projects that you intend to use it for. Remember, the larger the oven, the more time it takes to heat the air & objects inside.. ? Shorter time to heat up means better control of your soldering process. HTH, Dave M |
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Re: DIY Toaster Reflow oven
开云体育Hi Jim, ? I recommend you try electronics 101 group. Same server, same moderator, mostly the same guys, but more knowledge there. For your oven, I could recommend any electric oven modified to be controlled with one of these: ?
? Probably more expensive than a full DIY, but a LOT faster to the end result ? Nuno T. ? From:
[email protected] [mailto:[email protected]] On Behalf Of Jim Pruitt ? I looked through the messages for
this group for the last couple years but do not see any discussion about DIY
Toaster reflow ovens.? I know it used to be an easy thing to find on the
web but I have been searching for a few months now and all the ones Mr. Startpage
(pronounced Google) has given me have been 7 to 15 years old and use obsolete
and unobtainium parts.? I would love to buy a T962 or T962A but the price
is too high for me as I am on a fixed income.? Someone on a British forum
said someone was selling T962's on ebay for $129 usd but when I checked the
sale it would not sell to USA.? I know the T962 series would require a lot
of modifications to make it dependable but that would be easier than building
from scratch. |
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Re: DIY Toaster Reflow oven
开云体育A recommended soldering profile can be found in the data sheet
for NXP parts, for example, the NXP PCA9634.? The QFFN64 chip will be the problem (or would be for me), and I
avoid such packages wherever possible.? The FPGA144 (assuming
leads) is not a problem.? I'd tack the opposite sides to keep it
from moving (it will), and then solder each individual pin.? Lots
of flux is needed, and I tend to push a tiny drop of solder onto
the lead having the pad hot first.? I've not had problems.? Solder
wick will clean any inadvertent shorts.? Harvey
On 5/27/2020 3:49 AM, Jim Pruitt wrote:
I looked through the messages for this group for the last couple years but do not see any discussion about DIY Toaster reflow ovens.? I know it used to be an easy thing to find on the web but I have been searching for a few months now and all the ones Mr. Startpage (pronounced Google) has given me have been 7 to 15 years old and use obsolete and unobtainium parts.? I would love to buy a T962 or T962A but the price is too high for me as I am on a fixed income.? Someone on a British forum said someone was selling T962's on ebay for $129 usd but when I checked the sale it would not sell to USA.? I know the T962 series would require a lot of modifications to make it dependable but that would be easier than building from scratch. |
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Re: DIY Toaster Reflow oven
Hello Jim ^^)
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Have a look at the Elektor magazine back issues, they had published plans and all needed to make its own reflow oven for 'cheap'. and a pretty excellent one btw using an off-the-shelf micro oven costing peanuts, with a custom made controller board.^^) it was two years ago if I remember well, the project was a huge success and it was even produced in series by some makers. Amigalement, Jeff Le 27/05/2020 à 09:49, Jim Pruitt a écrit?:
I looked through the messages for this group for the last couple years but do not see any discussion about DIY Toaster reflow ovens.? I know it used to be an easy thing to find on the web but I have been searching for a few months now and all the ones Mr. Startpage (pronounced Google) has given me have been 7 to 15 years old and use obsolete and unobtainium parts.? I would love to buy a T962 or T962A but the price is too high for me as I am on a fixed income.? Someone on a British forum said someone was selling T962's on ebay for $129 usd but when I checked the sale it would not sell to USA.? I know the T962 series would require a lot of modifications to make it dependable but that would be easier than building from scratch. |
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Re: DIY Toaster Reflow oven
开云体育Hi there, Silicon chip Magazine have a electronic project on exactly this,they supply the pcb you fit the parts. from memory the pcb is about $15.00 AU , has a few smd parts as well as the micro which is also smd but every thing else is through hole , you use a toaster oven which plugs, into the controller, controller has buttons for inputting the temp setting etc, which you can read on a 20x4 screen lcd, it PID controlled. check it out, maybe its what you are after www.siliconchip.com.au should be may and april issues eddie On 27 May 2020, at 3:49 pm, Jim Pruitt <jpruitt67@...> wrote:
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DIY Toaster Reflow oven
开云体育I looked through the messages for this group for the last couple years but do not see any discussion about DIY Toaster reflow ovens.? I know it used to be an easy thing to find on the web but I have been searching for a few months now and all the ones Mr. Startpage (pronounced Google) has given me have been 7 to 15 years old and use obsolete and unobtainium parts.? I would love to buy a T962 or T962A but the price is too high for me as I am on a fixed income.? Someone on a British forum said someone was selling T962's on ebay for $129 usd but when I checked the sale it would not sell to USA.? I know the T962 series would require a lot of modifications to make it dependable but that would be easier than building from scratch.Without something like the T962 series I had seen the Controleo3 but not sure what I need (the $109 kit, the $249 kit, or the $299 kit) and which toaster oven (convection or conventional).? Does anyone know of a current DIY toaster reflow oven project on the web that would not cost a fortune to build? I know there was an article in a professional journal about 7 years ago that used a Black and Decker oven from Amazon but I can't find that article and do not remember what journal.? Even if I find it, will it work. A friend suggested that I use an Arduino but I am not sure what the profile is supposed to look like.? My idea was that it would 1.? Come up to a board heat up temp (100 C maybe) 2.? Hold that temp for some length of time 3.? Measure the board temperature to be soldered until it comes up to temp. 4.? One up to temp then raise temp to solder paste temp (450 C?) 5.? Hold for a time (30 seconds?) 6,? Cool down to original warm up temp (100 C) 7.? Cool down to room temp before opening the door. Have I missed anything? Does anyone know of any forums that deal with this type of project?? Does anyone know of a Arduino forum that deals in DIY projects?? I am on a couple facebook groups but see very little in the way of actual projects and it seems that Facebook does not allow sharing files very easily where 开云体育 or Googlegroups do allow easy file sharing. The object of course is to solder smt parts to pc boards.? One project I have uses a FPGA144 and a QFFN64 chip.? It was suggested that I drag solder them but I do not feel comfortable doing that and the parts were rather expensive and I can't afford to use them for practice. Can anyone point me in the right direction? Thank you. Jim Pruitt |
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Re: 3D printer scribe
Wow Matt!
My little experiment pales by comparison!? That is some serious work.? To be honest, I mostly did mine to see if it would work.? No drilling, just a couple of single layer surface mount boards There were really only a couple of things that caused me fits: - I drilled the of-the-shelf brass nozzle just far enough from the back end to keep the scribe from falling through.? Took two tries. - I really wanted a small spring to put behind the engraver tip, but couldn't find one at the time, so I used the RTV in the back of the hole.? Made the flatness more critical.? Some time later I found that the flint spring from a disposable lighter would be much better. - The carbide point on the engraver was too sharp!? I was scribing through the copper at first.? That wouldn't seem like a problem except that the extra drag ruined the line resolution and accuracy.? Dulled it a bit on a diamond lap. Again, my admiration and congratulations on the great work you did! Take care sir, Brent |
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Re: 3D printer scribe
Some elasticity from a drop of RTV silicone behind the scribe in the nozzle, but it _does_ require accurate bed leveling.? I actually dulled the scribe point with a diamond hone down to about 0.003" to avoid cutting the copper, which _did_ cause too much drag.? I'm using a BLTouch sensor and 16 point M29 command with a flat glass plate on the bed.?
The scribe to nozzle bore fit is +0.002", slide fit.? Not sure what you are referring to as "wobbly".? This surface mount board shows pretty fine detail:??(note the scale). Let me know if I be of any further assistance! 73, Brent, AB1LF |
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Re: New to the group and a question
开云体育Next message is "advance payment in full only, contact for account number. For templates, on way might be to look at all the PCB houses and
see what they sell.? I've seen some that offer templates with
their designs for five or 10 USD.? I've also seen templates offered separately.? Prices might have been a bit high, though. I just solder the pins individually, it works if you're patient and use a lot of flux. Harvey
On 5/13/2020 4:39 PM, Tony Smith wrote:
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Re: New to the group and a question
开云体育You’re replying to a spammer. ? First message is to get past moderation. ? Their next message is going to be “I’ve got masks to sell!? 10% for you!” ? Tony ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of chaz via groups.io
Sent: Wednesday, 13 May 2020 7:32 AM To: [email protected] Subject: Re: [homebrewpcbs] New to the group and a question ? I've bought a lot from here . Good quality.? ?
? ?
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Re: New to the group and a question
I've bought a lot from here . Good quality.?
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Re: No attachments
Jim Higgins
You can limit the size of individual attachments as well as have them deleted automatically on a first in first deleted basis to prevent exceeding the storage limit.
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Files and photos count toward the limit so uploading as a file or photo doesn't avoid hitting the limit. Those sig attachments are a royal pain that may require some "tough love." JimH Received from Steven Greenfield AE7HD via Groups.Io at 1/20/2020 03:20 UTC: Because attachments count against our group storage, and as moderator, handling them is either complex or impossible, no attachments will be allowed. I'm also seeing people with attachments that are no more than graphical elements added by their email program, or their signature in some kind of strange format. |
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No attachments
Because attachments count against our group storage, and as moderator, handling them is either complex or impossible, no attachments will be allowed. I'm also seeing people with attachments that are no more than graphical elements added by their email program, or their signature in some kind of strange format.
So please post files as either a link to where you found it (preferred) or upload it to Files or Photos. -- Steven Greenfield AE7HD |
Brent DeWitt
Steven Greenfield AE7HD