Drill bits

[teddy037.2]

cobalt tools have cobalt added into the alloy... and are better than high speed steel.  the split point and 135* tip is nice, too, when it comes to drilling harder stuff. I don't think I've ever come across HSS with a split point... new, anyway...

and this may be a silly question, but do you have a drill press? way easier than pistol drilling anything metal.

for sizes, i'd look into getting a selection of drills that will be smaller than all the thread tap sizes you're likely to come across.


oh! coolant! some sort of lubricant for the point of cut makes for happy drilling, as well

[DW]

There is just no good way to get out a bolt one the head is gone.  Best bet is too soak it forever in a high quality penetrating oil (Aero Kroil is my favorite, jeep guys seem to think PB blaster is awesome) before breaking it off and then just really take your time with a high quality 6 point socket.   Once it is broken off, I use a left handed cobalt bit taking it nice and slow.  Sometimes the left handed bit will break it loose.  Once drilled, I've got a Snap-on extractor kit that I use.  If the extractor doesn't work, you get the joy of drilling the bolt out and picking the pieces from the threads.  Usually have to run a tap through it after that. 

[He Man]

I dont have a drill press, but its not like it matters, its not like i can put the part (usually still on the bike)  onto the drill press anyway so i have to free hand it.

The most common bolts would be M5-M10. buydrillbits.com doesnt have metric sizes for left handed bits.

In all the bits ive broken, ive only just recently develop the muscle memory to just let the bit do its job.  cause i watch my frined break 4 of my bits on his bike causd he pressed to hard. You sometiems just want to stab it go fast and press as hard as u can, but it never works out well.

as fars penetrating oil goes. Ive seen people heat up the bolt and then throw wax on it, as it cools the wax seeps into the threads and acts a dry lube. Has anyone ever tried this or is penetrating oil the best way to go.

[DW]

buydrillbits.com doesnt have metric sizes for left handed bits.

You don't need to worry about fractional/metric.  They have more than enough spread to cover drilling out a broken bolt.  As far as the wax goes, I doubt it would work as well as something that stays liquid at room temp.  Just spray it and leave it overnight.  Much easier than fixing a broken bolt.

My extractor set is the Snap On EXDL10.  Works well for most bolt sizes on a motorcycle.  Whatever you buy, just realize that you will break bits.  Make sure you can get replacements.  When extracting a bolt, drill bits are expendable.  Expensive, but expendable.

http://buy1.snapon.com/catalog/item.asp?search=true&item_ID=10418&PartNo=EXDL10&group_id=1254&supersede=&store=snapon-store&tool=all

[He Man]

Awesome, thanks for the help. I have another question.

What about drill for a clean hole for new threads? Will a 6mm bit work for a 6mm tap? or do i need to make the hole bigger/smaller?

[ducpainter]

Awesome, thanks for the help. I have another question.

What about drill for a clean hole for new threads? Will a 6mm bit work for a 6mm tap? or do i need to make the hole bigger/smaller?

That's where there are optimum sizes.

You'd need a smaller bit.

Doesn't Google go to your computer?

http://www.newmantools.com/tapdrill.htm

[He Man]

doh. Thanks ducpainter. i didnt even look at google.

[ducpainter]

doh. Thanks ducpainter. i didnt even look at google.

Keep in mind all the tables are for a 75% thread.

If you can't get a metric drill do the conversion and use the closest drill you can. If the bit is smaller you'll have deeper thread or maybe 80%.

If you have a slightly larger bit you'll have a shallower weaker thread.

Always use a good quality cutting oil on taps. They'll cut better more accurate threads and the taps will last longer.

[Popeye the Sailor]

Also if you don't know how to tap holes, do some research. Do not just crank the tap down in your newly drilled hole. You'll find you won't like the answer for how to drill out a broken tap 

[ducpainter]

Also if you don't know how to tap holes, do some research. Do not just crank the tap down in your newly drilled hole. You'll find you won't like the answer for how to drill out a broken tap 

We were gonna cover that next week.

[hadesducati848]

i use carbide bits to drill hardened steel in safes when some one has a LOCK out. i suggest covering the broken  tip with JB weld to give a soft surface to start the hole on and it will keep it bit from sliding off and going off center.

[ducpainter]

Also if you don't know how to tap holes, do some research. Do not just crank the tap down in your newly drilled hole. You'll find you won't like the answer for how to drill out a broken tap 

These are fun...

[He Man]

We were gonna cover that next week.

1 guy's garage live feed!

[cyrus buelton]

Meh.  Use more penetrating oil and less force.

+1

That Breakfree shit or whatever the product in the yellow bottle is good shit.

I always spray it on a bolt I know will be hard to get off, let it sit for 10-20mins, spray again, let stand again, then it comes right off.

From my experience, Ducati must have some ownership in Loctite or a cement company because some of their bolts are so glued in, it isn't even funny.

I was never able to get off my left side foot peg assembly. I had a 4ft breaker bar and still couldn't extract one of those huge hex heads. I got it loose enough to spin the assembly to get the side cover off (was changing the starter on my 99 750).

I guess if I had air tools, this probably wouldn't have been a problem.........

[Popeye the Sailor]

Almost everything I work on is some ancient rusty car.


I've never had an issue loosening a bolt on anything built after He Man was.