In message <004378A54014D2118BFB00805FBE345102F70B6E@HOUEXC3> [log in to unmask] writes:
> Pratap,
> Thanks for the suggestion, but there is very little
> clearance on each side of the hole to the SMT locations. Even 1/8" tape
> (which would be extremely difficult to handle in a water soluble format) is
> too wide. That's why we're having issues with manual dispense of aqueous
> mask. Steve's idea of rigging together paint masking plugs is also
> impractical due to the small size of the holes (.035) and the hole pitch
> (.100). Also these types of plugs are made of silicone or neoprene, which is
> too 'mooshy' to stay in the holes. I know these DIP/SIP masking forms exist
> (or at least they used to). Joe McKenzie, the founder of Flextronics,
> developed what may have been the first mass-marketed ones when I worked for
> him in the mid-70s. They were molded out of a high-temp nylon and could go
> through hundreds of wave excursions without breaking down. However, Joe
> departed this earth a few years back and I don't know if anyone carried
> these products on or brought them out under a different company.
>
> Mike McMonagle
> PCA Process Engineering Supervisor
> K*Tec Electronics
> 1111 Gillingham Lane
> Sugar Land, TX 77478
> (281) 243-5639 Phone
> (281) 243-5539 Fax
> [log in to unmask]
>
> > "McMonagle, Michael R." wrote:
> >
> > > I have an application where I need to mask off a through-hole
> > SIP
> > > through wave solder. Washable liquid mask is getting on closely adjacent
> > > bottom-side SMT components, and I can't justify an automated dispenser
> > with
> > > current volumes. I remember a company back in the days of when
> > through-hole
> > > was king (waaaay back there) that made high-temp filled plastic masking
> > > thingamajigs that fit standard DIP/SIP patterns. You just dropped them
> > in
> > > the hole pattern before wave, then removed and reused them after wave.
> > > Anybody out there know what I'm talking about, and who makes them?
Hi Mike,
I used to sell these products from Joe McKEnzie many years ago. As McKenzie
grew bigger, they became less interesting for what was really an
interconnect company. When the company was eventually sold to a bigger concern,
the product was dropped.
I have seen similar things since, though I haven't taken as much interest since
there isn't as much call for them these days. Two ideas:
1) Bivar, maybe?
2) I think I saw something from one of the Japanese solder suppliers at Nepcon
West, this year or the previous. Koki? (They'll be lead-free! <g>)
Sorry I'm not more positive. If you find success, please let me know.
Regards,
Peter
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Peter Swanson Oxfordshire, England
INTERTRONICS
[log in to unmask] http://www.intertronics.co.uk
Suppliers of materials and consumables to the electronics & related industries
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