The Talking Machine Forum — For All Antique Phonographs & Recordings

The recent post on broken screws has emboldened me to make this query:

A few months ago, I was about to tinker with the horn height on my BC-34. Unfortunately, I was a little over-enthusiastic with the wrench, and broke off the bolt pretty much flush with the casting. I tried a broken bolt extractor; but, to my great chagrin, that broke off as well, and is now embedded in the broken bolt.

I have tried some of the hardest bits i could find, to see if I could drill into that, but to no effect. I did purchase a diamond masonry bit, but have not as yet dared to use it.

Is this a hopeless case?

Bill

Google is a wonderful thing! "Removing broken screw extractor" yielded this among others:

http://cr4.globalspec.com/thread/65854

JohnM wrote:Google is a wonderful thing! "Removing broken screw extractor" yielded this among others:

http://cr4.globalspec.com/thread/65854

Thanks!

I have absolutely no experience in welding; and the torch method sounds dangerous to do in situ; so I'll probably have to try a diamond point...

Bill

Sounds like EPDM is the surest route.

I talked with my brother and his friend he was a the head Machinic for 35 years at olds dealer. ans a stock car builer, He advises The best thing to use is a left hand drill bit that way when you drill down then when u undrill it may just extract the bolt
hope this helps
Here is a link that will help you


http://www.youtube.com/watch?v=Qk2vFHu4jeo

edisonrestorer64 wrote:I talked with my brother and his friend he was a the head Machinic for 35 years at olds dealer. ans a stock car builer, He advises The best thing to use is a left hand drill bit that way when you drill down then when u undrill it may just extract the bolt
hope this helps
Here is a link that will help you


http://www.youtube.com/watch?v=Qk2vFHu4jeo

Thanks! Do they make them hard enough to drill into the hardened steel of the broken extractor? Most drills won't even make a dent in it....

Bill

About the only way I could remove a broken easyout was to sharpen a very small metal chisel very sharp and tap it to break off parts of the easyout. It is slow and laborious and the chisel gets broken a lot but eventually you will get it. the key is that hardened items like this are also somewhat brittle and working from this idea will help. A drill is hardly ever hard enough to drill these things out with the exception that if you can get a small drill coated with diamond dust; these can sometimes be purchased surprisingly cheaply.

My favorite here is to use a Dremel type tool.
There are many very cheap new ones less than $30.
Then buy a pointed cone diamond tip and carefully grind away the screw extractor.
It may seem like it will take a hundred years but it won't.Less than one year
for sure.Once you get a hole down into the extractor you can easily grind side ways.
The diamond tips can be only $5 for a pack of 20 all shapes.
I used just one tip and rounded 2000 holes in 1/16 steel strip.
I could not believe the life I got from that tip.
The set cost me $3 for set of 20 tips.Wow oh wow.
Dip the tip in a pot of water from time to time to prevent over heating.