Hi Joyce,
Well I took my Dremel and diamond wheel and dove in. I guess you could say
it was like taking a ax into brain surgery 😀. This was the first time I've
ever done this so I didn't know where I should be cutting. But I guess I
got lucky and didn't destroy too much, you can see pretty much everything
afterwards. Here's a photo:
http://stevezeva.homestead.com/Opened_Relay.jpg
All I could see was the coil, the contacts, and the welded wires. I didn't
see a diode. You are right, it is pretty robust looking and looks like you
would have to really mangle the leads during prepping to hurt this. I'm
going to try open another one up tomorrow now that I know where I should
cut and get some better photos.
Steve
On Thu, Jul 28, 2016 at 5:32 PM, Yuan-chia Joyce Koo <[log in to unmask]>
wrote:
> well, just treat it with kid glove... or cross section, open it all
> up...and see what is going on inside.... assessing yourself... (possibly
> the result is still needto be treat it with kid glove ;-).
> On Jul 28, 2016, at 6:33 PM, Steve Gregory wrote:
>
> Hi again Joyce,
>>
>> Just tried to x-ray it with our Glenbrook x-ray, we just don't have the
>> juice to see through it...
>>
>> Steve Gregory
>>
>> On Jul 28, 2016 4:09 PM, "Yuan-chia Joyce Koo" <[log in to unmask]> wrote:
>>
>> opps, too quick... if you get a diode...wb could be a problem...
>>> On Jul 28, 2016, at 5:03 PM, Steve Gregory wrote:
>>>
>>> Hi Joyce!
>>>
>>>>
>>>> Yep, as far as I can tell. There isn't much of a datasheet for the
>>>> relays
>>>> that we are using, but it shares the same vibration and shock specs as
>>>> the
>>>> Teledyne relays, so that tells me that they are very similar:
>>>>
>>>>
>>>>
>>>> http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=PRMAC-26X&DocType=DS&DocLang=English
>>>>
>>>> Steve
>>>>
>>>>
>>>>
>>>> On Thu, Jul 28, 2016 at 2:18 PM, Joyce Koo <[log in to unmask]> wrote:
>>>>
>>>> something similar to this internally? if there are wire bonds connect
>>>> to
>>>>
>>>>> the transient suppression diode, or some other tricky interconnect, it
>>>>> might be...'
>>>>> http://www.teledynerelays.com/pdf/electromechanical/432.pdf
>>>>> steve, do you have internal construction x-ray image? TO-5 is very
>>>>> strong
>>>>> seal using glass, interconnect using spot weld to the leads may not be
>>>>> easy to damaged, depend upon how it constructed. my 1.4 cents.
>>>>> http://www.teledynerelays.com/pdf/electromechanical/432.pdf
>>>>>
>>>>> jk
>>>>> http://www.teledynerelays.com/pdf/electromechanical/432.pdf
>>>>>
>>>>> Steve,
>>>>>> Do they have PROOF that bending the leads cause damage?
>>>>>> Bev
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
>>>>>> Sent: Thursday, July 28, 2016 11:12 AM
>>>>>> To: [log in to unmask]
>>>>>> Subject: [TN] Prepping TO-5 can style Relay...
>>>>>>
>>>>>> Hi All,
>>>>>>
>>>>>> We're building a board for a customer that uses a 8-lead TO-5 style
>>>>>>
>>>>>> relay.
>>>>>
>>>>> The footprint on the board requires that the leads are spread out to a
>>>>>> larger diameter circle than what diameter is when they come out of the
>>>>>> body
>>>>>> at the bottom of the relay. Here's the information for one of the
>>>>>> relays,
>>>>>> there are three others that are the same style:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>> http://www.digikey.com/product-search/en?lang=en&site=us&WT.z_cid=ref_findch
>>>>>
>>>>> ips_standard&mpart=PRMAC-26X
>>>>>>
>>>>>> So we have a Simonds CLP274 lead processor with a die that matches the
>>>>>> footprint on the PCB:
>>>>>>
>>>>>> http://stevezeva.homestead.com/Simonds_CLP274.jpg
>>>>>>
>>>>>> We insert the part which spreads the leads out, then step on the pedal
>>>>>>
>>>>>> and
>>>>>
>>>>> a guillotine style blade shears the leads off. I've used the prep unit
>>>>>> many, many time before at previous employers without issues. The
>>>>>> customer
>>>>>> is saying that prepping the leads in this unit is damaging the relay.
>>>>>> So
>>>>>> now we are to pot the leads before prepping them with a 2-part epoxy
>>>>>>
>>>>>> using
>>>>>
>>>>> a tooling fixture as a mold for the epoxy, and the potted relay looks
>>>>>>
>>>>>> like
>>>>>
>>>>> this:
>>>>>>
>>>>>> http://stevezeva.homestead.com/Potted_Relay.jpg
>>>>>>
>>>>>> Has anybody ever heard of this Simonds unit damaging relays like this?
>>>>>>
>>>>>> Has
>>>>>
>>>>> anybody had to add potting to a relay like this? I can understand
>>>>>> wanting
>>>>>> to keep the leads coming straight out of the bottom of the body before
>>>>>> making the bend to match the footprint on the board, but I think I can
>>>>>>
>>>>>> use
>>>>>
>>>>> a Bivar permanent spacer and slip it over the lead and accomplish the
>>>>>>
>>>>>> same
>>>>>
>>>>> thing. Something like this:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>> https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwi
>>>>>
>>>>> qk8zCt5bOAhWJ1IMKHebaCR8QFggxMAE&url=http%3A%2F%2Fwww.bivar.com
>>>>>>
>>>>>> %2Fportals%2F
>>>>>
>>>>>
>>>>>>
>>>>>> 0%2Fproducts%2F616-070.pdf&usg=AFQjCNESVvvX6qOo_-0T94sAYNLP8AJ21Q&cad=rja
>>>>>>
>>>>>> Or even a nylon washer that matches the diameter of the lead pattern
>>>>>> (.200") coming out of the bottom of the relay. Potting this relay is
>>>>>>
>>>>>> going
>>>>>
>>>>> to be very time consuming and there's going to be a risk of getting the
>>>>>> epoxy on the leads that will ruin the solderability of the part. I'm
>>>>>> just
>>>>>> trying to understand if it is truly the Simonds prep unit causing the
>>>>>> damage, and if this really is, and easier way other than potting them
>>>>>> to
>>>>>> accomplish the same thing.
>>>>>>
>>>>>> Thanks all!
>>>>>>
>>>>>> Steve Gregory
>>>>>>
>>>>>> --
>>>>>>
>>>>>>
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>>>>>>
>>>>> --
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>>>
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