I'm in serious need of something that will bite into studs broken in to the head.

 

Solid Carbid Drills will do the job. You could try a normal HSS Drill, with a good web thining. Just be sure to use a center drill. Should work fine. Always watch for good runout, right speed (6000 divided through the bit diameter in millimeter, gives good numbers if the drill is above 1mm) and good cooling. Good Luck.

 

What brand would have solid carbide ?

 

Ummhh.. I'm from Germany, so I don't know where you can get hold of some? Maybe try a machine shop, they could be willing to sell you one? Shouldn't be used in a cord drill though.. preferably in a good drill press. I prefer Sandvik or OSG.

 

oh I under stand now..

 

Try http://www.use-enco.com, they always have the best prices I've found for machine tooling.

 

try and get a reverse flute drill (spins backwards from a normal drill)... it should help in getting out the stud. i have a couple lying around the shop.

 

I used a punch to make a little guide, but as usual I have trouble getting the drill bit to bite into the metal. Can I have some advice on that?

 

Get the stud/bolt as flat as possible, center punch the center of the bolt. Take a center drill to get things started after that use the proper size reverse flute drill bit.

Good Luck!

 

I use cryo-treated bits. You may also want to invest in a broken nipple or stud extractor. My nipple extractor came in a kit with drill bits.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GsrRussell &raquo;</TD></TR><TR><TD CLASS="quote">I use cryo-treated bits. You may also want to invest in a broken nipple or stud extractor. My nipple extractor came in a kit with drill bits.</TD></TR></TABLE>

You have to make a hole before inserting an extractor inside a stud of course, but I can't even get a hole started ....

Tried the exterior extractor it broke the stud now it's within the part.

 

Thats happened to me before. I ended up using an 1/8" carbide bit w/my die grinder to remove as much material as possible. Once I was past the extractor, I used the drill. The success of using the die grinder all depends on how steady your hand is and obviously the bigger the bolt the easier it will be.

 

You are gonna need heat.

 

take it to an engine shop where there is a reputable machinist, or any tool maker can drill that out. At this point, you just need to drill the minor diameter out of that stud. I wouldn't bother with "easy outs" or trying to drill it more, you need a precision solution.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mcmotors &raquo;</TD></TR><TR><TD CLASS="quote">take it to an engine shop where there is a reputable machinist, or any tool maker can drill that out. At this point, you just need to drill the minor diameter out of that stud. I wouldn't bother with "easy outs" or trying to drill it more, you need a precision solution.</TD></TR></TABLE>

No thanks, because thats over the top .

I can handle this.

 

I just got a new drill bit today, its called armor cut, by cryobit. Its a fluted drill bit made for cutting hardened tool steel. It works awsome.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GsrRussell &raquo;</TD></TR><TR><TD CLASS="quote">I just got a new drill bit today, its called armor cut, by cryobit. Its a fluted drill bit made for cutting hardened tool steel. It works awsome.</TD></TR></TABLE>

I can't find anything on it in yahoo search ?

 

I was looking thru this forum and say your posting. I recently came across martintoughtool.com that has a lot of these tools.

 

i know it's an old thread...but here's my $0.02. i use a dremel with a 1/8 in. carbide bit which you can find for less than $10 @ lowes/homedepot/ace and 60% of the time it works, every time.