RE asks "who is EFD"?
they are a manufacturer of dispense and solder products
www.efd-inc.com
800/556-3484 US
0800/585-733 UK
John Thorup

> -----Original Message-----
> From: Ingemar Hernefjord (EMW)
> [SMTP:[log in to unmask]]
> Sent: Thursday, September 09, 1999 5:42 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Clogging dispensers soon...
>
> Mike, your help is of same high standard as is Aussilek's (yes,
> Aussilek, you must accept even english are bright, rembember the
> Piltdow man, Nelson, Newton,Thatcher and Kermit),
> now, Mike,
> ----------------------------------------------------------------------
> --------
> A:
> It sounds from this and previous postings "that in view of your
> demanding application
> it might be better to use a higher specification needle than the
> standard type
> normally supplied". Or whatever your present supplier is saying.
>
> Such a higher specification might be one in which the moulding around
> the steel tube
> does not have sudden cross sectional changes and no internal reverse
> re-entrant
> shapings.
> RE: exactly what we will do, we have cross sectioned and seen what you
> mean. We have a reputation for making tough specs, we will use that
> from now on.
> ----------------------------------------------------------------------
> --------
>
> B:
> You can get these OK from people like EFD. So far as tube length is
> concerned these
> suppliers also make a shorter length, but still long to allow manual
> access. No
> reason why you should not cut them down, provided you can get a good
> finish. I
> suggest a length no greater than 5-6mm.
> RE: please explain who EFD is, we will call immmediately.
> ----------------------------------------------------------------------
> ---------
>
> C:
> It just might be worth investigating the type also supplied for solder
> paste
> dispensing. These are made entirely of polysomethingene. And are a
> conical cross
> section from fitting to dispense end. The problem is they can be
> flexible and may not
> give precision placement accuracy.
> RE: good idea! May be a little bit cheaper also, ours cost 200GBP
> each!
> ----------------------------------------------------------------------
> ------------
>
> D:
> Reverting to your question on internal finish of needle:
> From what little I know about laser machining I suspect you would have
> great
> difficulty making a smooth hole of this size and length. Irrespective
> of that,
> whatever method you use to correct the internal finish it would be
> especially
> difficult to build a tool to hold the needle and get the alignment you
> require.
>
> So as an alternative you could make your own theoretically perfect
> ones. These would
> consist of a hemisphere internal shape with a projecting tube just
> long enough to
> clear the external body of the hemisphere from the substrate surface
> to prevent
> smearing.This would be much easier to make.
> RE: Also good idea, like putting a fine needle into a wider, and the
> finer only a millimeter ore two long. THEN you may be able to use
> laser.
> ----------------------------------------------------------------------
> -------
>
> E:
> I now recall visiting a company once that is using these, or at  least
> was about 18
> months ago, in high speed component manufacture, I believe they made
> them themselves
> but if you become convinced this is an answer then I will try to
> remember where and
> who they are and see what I can find out.
> RE: please, look once more in your drawer.
> ----------------------------------------------------------------------
> -------
>
> F:
> waiting for pumkin wine recipe, you just opened a new file, I need
> something to pour into it......
>
> CU
>
> Ingemar Hernefjord
>
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