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A ham friend of mine in Atlanta gave me these Altec 802D compression drivers about four years ago. He even paid the shipping but one arrived with a broken stud as you can see and I tried to drill it out and use an easy out but even my SnapOn easy out broke so now I would like to know,can I safely pull off the magnet housing or is it compression fit? They sound very good and the diaphragms are perfect.I just want to get that screw out safely.I have machines at school in our dept but I want to make sure we don't damage the magnet.He got them from a silent key's estate along with other stuff and even tho they were a gift,I still want the screw stud replaced.It was damaged in shipping apparently.
"
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
I have successfully drilled a small hole in a broken stud, then used an easy-out to remove it.
The problem is that the intense magnetic field attracts the drill shavings. No matter how well you tape over the gap, some will surely find their way into the gap where they're hard to remove.
You're around a lot of auto equipment that regularly deals with broken studs.
So if ALL else fails and it's the trash for these then try this.
Dremel out around the stud about 1/4 deep and try to grab the stud and unscrew it. It may work, it may trash the driver. But like I said if all else fails and you're out of options.
Yes...no way this should be trashed. He could even drill & tap oversize,
then use a threaded insert, say 1/4" thread inside and 3/8" out, and
put the 1/4" stud into that. Super easy, especially with a drill press.
Mike does have access to equipment to deal with that kind of problem. All he needs to do is make some sort of jig to safely hold the driver in place while he uses the drill press.
Come on Mikey, just use your teeth and open it like a twist off bear bottle.
with one bolt and it sounds wonderful.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
1. Mill a flat on the broken stud using bottom cutting end mill.
2. Center drill
3. Flood with Kroil. Well, not flood, but enough to get thread good and wet.
4. Appropriate size left-handed drill should do the rest.
I have tap and dye sets but I also do a fair share of helicoil fixes.I had one guy that brought me a Ford C6 automatic and he cross threaded one of the bolts that holds the modulator in place.I had to drill it out and repair the splinter in the case with an aluminum mix paste and let dry.Then I smoothed it with a file and put a helicoil in it.I would have retapped it but this was safer.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Bear in mind, once you open it up, then it's trash. Mostly
improbable that you can re-align the gap. Not to mention
a loss of flux density.
Edits: 09/17/16
There are certainly folks who know how to do it.
I would, personally, be terrified to be working around that kind of magnetic field with any tools made of steel or any other magnetizable metal!
Heck, given a free 802D, I would think the cost of a trip to GPA for a rehab would be easy to justify.
It's not a 288, but the 802D is a pretty nice small-format compression driver (at least, to my ears and taste)
Worth investin' a few shekels in, you know?
:-)
all the best,
mrh
Conor
That's why I wanted to be sure. GPA can fix it but I have so many Altec,JBL,and EV compression drivers that it is no big deal..I will take it to the machine shop which is one building away from the auto tech lab where I teach so it's no big deal.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Yeah, like I said it was an end of life situation. Maybe he can refill the gaps with dense solder??? Not the same but it may help?
Lead solder too soft...silver solder would do it..melting point
lower than brass rod, but about as strong. Might still get too
hot with torch...MAPP gas as a minimum.
JB weld is impressive epoxy....might work.
Hi...no way would I try separating the pole pieces...would it not be
simpler to drill and re-tap the 1/4" threads?. You can make a stud
by cutting the threads of a long bolt if you don't have all-thread rod.
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