Group Buy Interest?

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chance said:
isn't there also a thread called "Witworth"
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IIRC, it is an older style and had 55 degrees thread angle, which result in different thread depth.

I wish all the microphone manufacturers had the same standard (like for example all measurement mics use 60NS2 and spec it in the documentation).
It is no fun to measure the threads and then calculate and change lathe gears, and can be pretty time consuming :mad:.
 
Marik said:
It is 0.45 mm. The closest imperial would be 56TPI.
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The closest I can get in 18mm is 0.5mm, and that's far enough off that would probably bind after one rotation or so. I guess all I can hope to do is build one out of epoxy, coat the inside with copper foil, and lap the foil over the threads on the outside. There's no way I could fit a lathe in my house. :D

I'm really baffled by one thing, though. They can't possibly be turning all of these mics on a lathe, can they? There have to be taps and dies for these threads. The labor for doing it them one at a time on a lathe would be enormous. I'd expect you to shave ten bucks per unit off your production cost just by switching to a standard thread pitch if that were the case....

Chance? Any idea?
 
dgatwood said:
The closest I can get in 18mm is 0.5mm, and that's far enough off that would probably bind after one rotation or so. I guess all I can hope to do is build one out of epoxy, coat the inside with copper foil, and lap the foil over the threads on the outside. There's no way I could fit a lathe in my house. :D

I'm really baffled by one thing, though. They can't possibly be turning all of these mics on a lathe, can they? There have to be taps and dies for these threads. The labor for doing it them one at a time on a lathe would be enormous. I'd expect you to shave ten bucks per unit off your production cost just by switching to a standard thread pitch if that were the case....
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Ahhhh,

I have a CNC controller for the lathe (incidently, it can work with a rotary table, as well, giving whatever index you wish). I have no time to install it, but when I do, with a few bottons I tell it: "Hey you, stupid machine, make me a thread with 0.017 mm pitch (:eek:) and in 20 seconds it will spit me one. Hey you, make me a 123.45TPI--no probs".

Just think of it, if I was not that lazy to instal a step motor (and I already have a driver), I'd safe many many hours of work... huh :o
 
chance said:
isn't there also a thread called "Witworth"
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Yes, but it's not in common use, also it was a fairly coarse thread. Without wanting to take over this thread, considering the nature of the last few posts, I think some people need to understand that threads just ain't threads, there's a damned sight more to them and the following is only scratching the surface............................:

Joseph Whitworth proposed the first standardisation(sp) of screw threads in 1841 but it wasn't until 1860 that his 55 deg pitch and set TPI per diameter was accepted by industry in Britain and known as British Standard Whitworth (BSW). In 1864, in the US, William Sellers proposed a 60 deg thread with various TPI based on diameter, these proposals went on to become American Standard Coarse (NC) and Fine Series (NF), sometimes refered to as National Coarse and National Fine or UNC and UNF, the "U" signifying "United" or "Unified".

At the same time, in Europe there were moves to standardise the different thread series in use there, the 60 deg Metric thread was the eventual result.

Additionally, there was the British Fine (BF) thread and for thread sizes below 1/4", there was the British Association Thread (BA) which was a small fine thread based on a 47.5 deg thread. It was as far back as 1948 that the UK, US and Canada agreed to use the Unified Thread (UNC and UNF) as the standard for countries use inch units of measure,and in 1965, the British Standards Associaction recommended that BSW, BF and BA be made redundant with the ISO Metric thread as 1st choice replacement and the ISO Unified series as 2nd choice.

What is not easily seen, is the fact that there are frequently differences in the profile of threads, some can have flat crowns, the radius of the crown and root (the valley) can be different, etc., etc. Add to all of this the existence of specialised machining threads where even for a relatively large diameter, an extremely fine thread is used............I suspect this may be what you guys are encountering at the moment.

:cool:
 
If we could compress each post in this thread down to 0.5 millimeters, then it would be fairly short. Who's got the lathe again?
 
I'm on a break (26 takes and the guitar player can't nail it)
Just got an E-mail from the manufacturer. I guess it was China's new year and they are all back to work. They are transposing the specs into english from their lab. and I just found out that the specs that my tech gave me to send so long ago, were for the early (original) 1073, 81, and 84. Now things are starting to make sense. My tech never told me until today, and he said "I thought you knew" Fact is I never worked with the 81 or 84, only what I have which is the 73.
 
Hey Chance, if you have any leftover mics to sell you can auction them off for free over at my new gear site. (Here) That way it will be fair to everyone. You know, no favoritism as to who gets them.

I can even give you some extra privileges to feature them on the front page since I own the site. :)
 
crazydoc said:
I couldn't fit this next one on the screen with adequate resolution, so here's a link. Unfortunately, the original file's image resolution of these is terrible, but hopefully adequate.
project1b.jpg
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With regards to my last post, the top jpg is the 84
the middle jpg is the 81
and the bottom jpg is the 73
got another full day of tracking, but my tech is coming over later, and if he has any additional info, I will post it later this afternoon.
 
Back to the subject of mics, the mic division just sent me some info of a new product. It's a very large (35mm) dia. capsule condensor mic that can be powered by USB-2 or phantom, plus it has a built in headphone jack. I don't know if this would be a popular item or not. Still busy, still waiting on specs for the pres.
 
What's the deal on replacement ribbons? I need two please. Thank you. Sorry....
 
About the replacment ribbons. We had talked about them shipping with the next order, then seperately. I will try to call them tonight (their morning) I do know that the small shockmounts, because of the weight/size, would be with the next order, but the ribbons should be cheap to ship.
 
Plenty of mics here Chance, just didn't want it to get lost in the Gear Lust!
 
chance said:
can be powered by USB-2 or phantom
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If it's powered by USB, then it likely is a digital device. After what happened to Behringer, I would advise avoiding that unless you have the mics tested and certified for FCC compliance.
 
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