Mix.
www.garagejournal.com
just saw a video where the guy used copper tube to protect the threads, thought it was smart. his application was steel threads so more critical than aluminum heads. worked great
This would be something new for me, I’m only guessing, use a drill press to drill a 13/16” hole and then you just run a 6mm tap through that hole? I would need to watch a few video’s to figure out how to do it I’m sure. Is there a cutting oil with when using the tap?
Nice job, a lot of terms I’m not familiar with here. Definitely a skill I would like to learn. I may browse around some video’s tomorrow night to give me an idea how to go about drilling and tapping new threads. Is it just me, or is the quality of bolts not as good as it once was?
It depends on what the OEMs specify. In many ways, bolts are better now than ever before. But Toyota has no reason to splurge on a premium fastener for a brake line bracket. If I was engineering that, I’d make the same decisions they did. Which means a minimum capability 8.8 class bolt.
-For almost all tapping jobs a cutting fluid should be used. The only common material where drilling/tapping is supposed to be dry is with cast iron. Cast iron can be identified when drilling in that it produces chips that crumble rather than flexible spirals. Not knowing your steering knuckle it could be forged or cast. Regardless of what the material is I would strongly suggest using a sharp tap, likely a new one. If the tap requires more force than it should or it starts "squeaking" while tapping you need to remove it as it's probably on the verge of snapping off on you. When drilling keep the RPM low enough to visually see the drill flutes or you risk work hardening the material which will make tapping much more risky/difficult than it should. If using a drill press for this it's ok to get the tap started 2-3 threads but don't power tap it the entire operation, it will risk breaking/shattering the tap and making a bigger problem. Tap it by hand the remainder of the time and back the tap out now and then to clear any chips off the tap. Good luck.
Usually done with a hand drill part on the car, flatten the top of the broken bolt, center punch and drill. I usually start with a 1/8" bit to get a pilot hole.
-Sure hope that was a typo for 13/16", you don't want to try drilling a 13/16 =.8125 diameter hole, even in an average drill press. Look up the drill size required for whatever tap you intend to use.
I didn't even notice he didn't type 13/64"
Great post. My first use of Tap Magic was an epiphany. Cutting fluid is not oil and oil is not cutting fluid! I couldn’t believe the difference.
