OK , LETS KEEP IT SIMPLE ; TO SAVE JASON FROM VERTIGO READ INSERTS BELOW -----Original Message----- From: Ingemar Hernefjord (EMW) [mailto:[log in to unmask]] Sent: Thursday, 9 September 1999 22:42 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, HHMMM, MUST i INGE ? SUPPOSE ; DID YOU NOTICED BOTH IN AND AE STOPPED THEIR PUBLISHED WORKS ON BEGINNING OF RESEARCH OF MAGNETIC FIELDS ? COULD UNDERSTAND WHY . NOT SO SURE BOUT EMPRESS MAGGIE ---------------------------------------------------------------------------- -- 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. WE ALL AGREE ON THIS ONE (BUT IT'S NOT PLASTIC MOUNTED EFD) ---------------------------------------------------------------------------- -- 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. EFD WILL NOT HELP YOU IN THIS PRECISION END (YOU NEED OUTER CHAMFER = SHARP EXIT EDGE FOR FAST RELEASE) ; NEVER SEEN THIS PRECISE NEEDLES FROM THEM ; AND YOU NEED THE SIDE FOOT STILL ---------------------------------------------------------------------------- --- 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! TOO SOFT , BEEN THERE, SOME 20MM LONG ; NO SIDE FOOT ; THOSE ARE GOOD FOR LETTERING CAKES !!! HONEY OR ELSE ; FORGET IT ---------------------------------------------------------------------------- ------ 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. WELL , INGE , DID YOU NOTICE HOW GOOD WAS THE INTERNAL SURFACE OF THE CLAMPED PAD ITSELF ? SEEN NANOMETERS HOLES PERFECTLY SMOOTH ; CAN'T SEE THE ISSUE ---------------------------------------------------------------------------- - 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. AGREE WITH THIS ONE ; IF YOU WANT IT RIGHT, DO IT YOURSELF (MUST BE THE ENGLISH WAY) ---------------------------------------------------------------------------- - F: waiting for pumkin wine recipe, you just opened a new file, I need something to pour into it...... MIKE ; ME SWEATING HERE HCL JUST TO AMUSE JASON (FRIENDLY IDEAS, STIFF SHIRTS?)AND YOU KEEP PRIVATE PING PONG WITH INGE ? PAUL CU Ingemar Hernefjord ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. 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