Where did you source these? Amazon has some but .......
A2 stainless bolt sheared
- Thread starter ShakeyGS
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Deleted account 191119001
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See now there’s something else I’ve learned today
Yep but finding a left hand drill in the UK will not be easy, most people are right handed.............
Deleted account 181015001
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Be careful you don't go too deep with the drill the alloy at the bottom of the hole may be very thin and the drill might grab
I’ll take the bar off the other side and measure the blind hole depth
Deleted account 191119001
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I’ll take the bar off the other side and measure the blind hole depth
Maybe try these bolts next time 18-8 Stainless
Steel alloy with 17-19% Chromium and 8-13% Nickel
+ 1 for above advice Cobalt drill bits and use the slowest speed on your drill don't put lots of pressure on it the drill bit will cut without force and regularly cool with water.
Drill first with a small bit then go next size up. If you have a variable speed drill you will gauge when you have the optimal speed by the amount of material coming off.
You can be tempted to go fast with the drill but that will just blunt the bit with excessive heat.
As said gauge the depth of the hole by the other side and make sure you don't go deeper using electric tape stuck on the bit if possible.
I take it you were able to remove the wrecked ez-outs?
Yes. They had very flattened splines so I’ve obviously work hardened the stainless.
Most in my box are 18-8. I’m not sure if the A2 is BMW spec or a bolt fitted as a replacement by the previous owner of the bars......
Yes. Just offer the bike up to an EDM machine, lay it in a BIG bath of oil on its side and off you go ;-)
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Karlos
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Plus one for that one , works every time .
So that's a no then....
Deleted account 191119001
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but all A2 are not the same hardness
Unfortunately yes, it's a no. But i liked the idea
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Here we went again.
Expecting a set of Cobalt drills to turn up from RS today (they didn't) I went into my local tool store to see if they had any left handed drills. They didn't but I did pick up a 5.5mm cobalt drill bit just to be going on with. I'm kicking myself for not buying a 6mm as well but there we go. I also got a decent set of easy-out bits to replace the ones made from cheese I already had.
Here's where I got to yesterday;
Theres still a fair bit of stainless material left in the top of the blind hole due to the wonkiness of my drilling and you can see where I was getting to trying to centrepunch my way into the hole.
Following advice given here I slowly drilled in with the 5.5mm bit and removed quite a bit of stainless material. I didn't want to go too big with my drills as I was afraid of removing engine casing material too so I went very gently until I thought I might just be able to cut an M8 thread into the "hole" I had arrived at; to the required depth for a replacement bolt (about 5mm shorter than the original).
I tried to use the normal 3 stage approach but just couldn't get the tapered taps to take in the hole. I was getting a bit grumpy by this time so tried just the bottoming tap. This seemed to bite but because I hadn't removed the exhaust again, I decidided to put the tap into my cordless drill and try to start it on a very low speed for about two or three turns. IT WORKED!
A true bit of horrible bodgineering but with a good dollop of coppaslip we're back in business.
Ta Daaaaaa!
Expecting a set of Cobalt drills to turn up from RS today (they didn't) I went into my local tool store to see if they had any left handed drills. They didn't but I did pick up a 5.5mm cobalt drill bit just to be going on with. I'm kicking myself for not buying a 6mm as well but there we go. I also got a decent set of easy-out bits to replace the ones made from cheese I already had.
Here's where I got to yesterday;
Theres still a fair bit of stainless material left in the top of the blind hole due to the wonkiness of my drilling and you can see where I was getting to trying to centrepunch my way into the hole.
Following advice given here I slowly drilled in with the 5.5mm bit and removed quite a bit of stainless material. I didn't want to go too big with my drills as I was afraid of removing engine casing material too so I went very gently until I thought I might just be able to cut an M8 thread into the "hole" I had arrived at; to the required depth for a replacement bolt (about 5mm shorter than the original).
I tried to use the normal 3 stage approach but just couldn't get the tapered taps to take in the hole. I was getting a bit grumpy by this time so tried just the bottoming tap. This seemed to bite but because I hadn't removed the exhaust again, I decidided to put the tap into my cordless drill and try to start it on a very low speed for about two or three turns. IT WORKED!
A true bit of horrible bodgineering but with a good dollop of coppaslip we're back in business.
Ta Daaaaaa!
Karlos
Registered user
Here we went again.
Expecting a set of Cobalt drills to turn up from RS today (they didn't) I went into my local tool store to see if they had any left handed drills. They didn't but I did pick up a 5.5mm cobalt drill bit just to be going on with. I'm kicking myself for not buying a 6mm as well but there we go. I also got a decent set of easy-out bits to replace the ones made from cheese I already had.
Here's where I got to yesterday;
Theres still a fair bit of stainless material left in the top of the blind hole due to the wonkiness of my drilling and you can see where I was getting to trying to centrepunch my way into the hole.
Following advice given here I slowly drilled in with the 5.5mm bit and removed quite a bit of stainless material. I didn't want to go too big with my drills as I was afraid of removing engine casing material too so I went very gently until I thought I might just be able to cut an M8 thread into the "hole" I had arrived at; to the required depth for a replacement bolt (about 5mm shorter than the original).
I tried to use the normal 3 stage approach but just couldn't get the tapered taps to take in the hole. I was getting a bit grumpy by this time so tried just the bottoming tap. This seemed to bite but because I hadn't removed the exhaust again, I decidided to put the tap into my cordless drill and try to start it on a very low speed for about two or three turns. IT WORKED!
A true bit of horrible bodgineering but with a good dollop of coppaslip we're back in business.
Ta Daaaaaa!
Result!
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Deleted account 191119001
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Cobalt and patience is your friend, copaslip also, except on caliper bolts...................
Phew!
I was hoping you sort it Martin
I was hoping you sort it Martin
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