Morning Nancy,
Your theory is correct. I don't know whose equipment you have, but they
should be able to provide you with a design guideline which should spell out
the specifications. We made our specifications reflect what the equipment
manufacturer called for.
This gives us the best possible situation. With holes being per the
manufacturers specifications, we can expect to put the lead in the holes,
and have good solder joints that will hold.
Now, having said that, on the radial machine you need to be careful of the
rectangle leads. Our specifications call for the lead to be measured on the
diagonal, and then add the .014". We have had nothing but success following
the mfgrs specs.
Good Monday morning to you, and best of luck. Let me know if I can help any
more.
Richard Hamilton
Clemar Mfg. / Rain Bird
[log in to unmask]
> -----Original Message-----
> From: Nancy Trumbull [SMTP:[log in to unmask]]
> Sent: Monday, December 13, 1999 6:03 AM
> To: [log in to unmask]
> Subject: Re: [TN] PTH Design question
>
> Richard,
>
> Thank you so much for replying back.
> I'm sorry my note was short. I have more work right now than I need.
> RH is short for Radial - lead component insertion machine.
> I want to make sure I understand you so I well give
> you my interpretation on your reply.
>
> Decimals of inch .014 Converts to 0.3556 millimeters
> Decimals of inch .020 Converts to 0.5080 millimeters
>
> So if your lead was 0.020" ( inch ) than your Hole dimension would be
> 0.034"± 0.004 (inch )
>
> Therefore if our lead is 0.5080mm (millimeters) the
> the hole size would be 0.8636mm ± 0.10 (millimeters)
>
> The hole dimension is 1.1 ± 0.1 millimeter
> So I can ask our design department for a design
> change
> From the 1.1mm±.1 to a 0.8636 mm ± 0.1
> A change of 0.2364mm
>
> That is my interpretation of your reply.
> Do I have it right or am I brain dead this morning I have not not not not
> had time to check yet.
> Thanks for your help.
> Merry Christmas
> Nancy
>
>
> equipment
> manufacturer recommended. Specifically, we do .014" over lead diameter for
> the hole as a general format. We generally have 3 different lead diameters
> which relate to 3 hole sizes for automatically inserted components.
>
> It is Friday, so I am bit thick, but I do not understand the RH. So, to
> continue with comments on your information, my belief is that it could be
> a
> situation of oversized hole with a possibility of clinch angle and length
> thrown in for good confusion. Remember the lead will only take up a
> certain
> amount of the hole and the solder needs to fill in the rest. If the hole
> is
> oversized, and the lead is short, or not at a good holding angle, you
> could
> have all sorts of 'wonderful things' happen as a result.
>
> I hope I am not too far off base on your question. If so, feel free to
> slap
> me around and wake me up. If I can lend any more help (or confusion!) just
> holler!
>
> Richard Hamilton
> Clemar Mfg. / Rain Bird
> [log in to unmask]
>
> > -----Original Message-----
> > From: Nancy Trumbull [SMTP:[log in to unmask]]
> > Sent: Friday, December 10, 1999 8:41 AM
> > To: [log in to unmask]
> > Subject: [TN] PTH Design question
> >
> > Hi Netters,
> >
> > First let me wish each and every one of you a Very Merry Christmas and a
> > Happy and Save New Year
> > from us here in Michigan
> >
> > Now my problem: Aluminum Condenser that is being inserted by the RH is
> > leaning out of specification.
> >
> > I have checked
> > clinch = OK
> > clinch direction = OK
> > Hole dimensions= 1.1 ±0.1 OK
> > Lead radius = 0.5 OK
> > All are with-in standard
> > Yes, I know for many of you this may be a very easy question, but I
> still
> > need help.
> > Question that is on my mind is for design.
> > Is the Hole dimension to large for the Lead radius?
> > I do not know PCB design so I would like some information before I ask
> for
> > a design change.
> > Or does any one have any other ideas
> > Hey I might be one of the old ones in QA but I'm up for new ideas every
> > day.
> > I'll keep my thinking cap on until some one gives me a better idea or I
> > figure it out
> > Thank You All in Advance.
> > Nancy
> >
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