Broken Bolt Removal
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- เผยแพร่เมื่อ 19 ต.ค. 2017
- In this one I show you my technique for removing a broken bolt in a CB750 cylinder head.
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Great demonstration, I will get someone else to do it...... I would definitely fuck that up.....
The tapping was pretty scary lol, fair play! As an alternative, you can use the dimple on the end of the tap to help center the tap. Keeping your x/y, raise the chuck and put in a lathe/dead center bit, and then manually tap using that center for downward pressure - if you follow
Oh, and you can use the same method for putting the helicoil in square
Glad it's not just me who looses bolts. Excellent vid!
At 14:14 No, no and NO! Youre not going the wrong way. You're using the wrong drill bit! Try a good quality left hand drill bit. Drill a hole - 50% of the bolt size, and use plenty of penetrating oil. Go to a drill bit size, right below the thread inner diameter and push gently - then firmly, until the bolt comes loose, and starts to walk its way up the threads.
And, if that doesn't work. Since You already have a mill present, why not use a carbide end mill to remove most of the bolt - and pick out the thread spiral with a pair of pliers? A 1000 GBP CB750 head won't be the same thing with the helicoil in it....
The last comment..... I'm restoring Kawasakis from early 70s. There's no way I'm putting a helicoil on my bikes. After all, I'm not silly You know!
I'd rather have the thread hole welded up, and re-threaded.
Man you do love to waffle 😂
I think those hobby milling machines are all originally made by SIEG and modified a little between brands. I have one of their small lathes resold by Axminster and they're pretty competent. I've used it to make lost bushings and even make a steel drill guide for when I snapped an exhaust header bolt!
Nice job there James, I prefer Time-serts over heli's.
What make are them spanky Drills may i ask ?
good Job Mr J :-)
That we satisfying. :) Thanks for providing entertainment for a few visits to the toilet over the last couple of days !
I wouldn't try drilling a 3mm pilot hole into that with my drill bits, 5mm at least. dead impressed with the ones you used though. :)
Nice!
Left hand drill bit all the time.
I usually fire up the Tig welder and build up a stalagmite until it got above the hole. Then weld on a nut. Back her out with a wrench or even an impact gun. If you weld upside down then it's a stalagmite.
Also it $50 if you bring it to me first
If you already buggered it the $100
If a friend of yours buggered it then $150😜
Another AvE fan, I see!!
I don't see the purpose of the ti-al nitride bits. That's a wear coating which is used on cuntsten targlide. It's the carbide that's doing the cutting. Carbide is a bit risky if you don't have a rigid setup cus they shatter. I've had success with cobalt bits, saves me resharpening HSS /chinesium over and over.
When are you going to do an oil video? :P
If they work for you then that's all that matters in the end. I'd like some nice pricey dormer/presto bits but I really can't justify it.
i would have tried a left handed drill bit
Me too - the Head is perfectly set up on the Table,start with a 2-3mm pilot hole (obviously must be dead centre of the Bolt Stub) then use a LH Drill bit in gradual stages if possible to drill out the Bolt material and end up with a maximum diameter just short of the Bolt Shaft minus the thread.The remains of the Bolt shaft should spin out without any damage to the original Thread.