I have had a several instances in Corbin sandstone where tapping the bolt disengages the cone from the sleeve, but the cone does not regain enough purchase in the back of the hole to unscrew the bolt again. (Probably due to a heavily corroded cone or a wider hole in the back where the rock has disintegrated.) In soft rock or with extremely corroded bolts I would recommend removing the bolt entirely, taking off the hanger and then rethreading the bolt prior to hammering, so as to not create a dangerous situation where you can't remove the bolt but the hanger is still on so people could clip the compromised bolt. Sometimes funking the bolt and cone back towards the surface of the hole will help set the cone enough to unscrew as well, otherwise better have your grinder handy! I've had very little success with the hook tool on rusted bolts, method 2 looks very promising. Great video Greg!
Great video. This is what I've always done, though recently I hit a challenge. The bolt was so rusted that the bolt would not spin independently of the cone, so I'm stuck just infinitely spinning the bolt. Do you have any suggestions for this situation?
I've run into this several times and it's pretty frustrating. I finally found a tactic today that worked though. I got an SDS to 1/4" hex adapter and plugged a little 1/2" nut driver head into that. Then I could use my drill to spin the bolt for several minutes, similar to how you would spin a wedge anchor. I spun both directions, bounce loaded the spinning bolt, etc, until it finally slid out. In my case I think all the spinning and heat eventually broke the thread lock at the cone -- I still had to get the sleeve and cone out. FYI I used the same adapter to help me get the cone out of another bolt hole today. I did this by removing the sleeve and then reinserting the bolt, then pulling while spinning with the drill. Nicer than what I usually end up doing, which is to just put in earplugs and drill out the entire mess with an old 3/8" SDS bit.
I have had a several instances in Corbin sandstone where tapping the bolt disengages the cone from the sleeve, but the cone does not regain enough purchase in the back of the hole to unscrew the bolt again. (Probably due to a heavily corroded cone or a wider hole in the back where the rock has disintegrated.) In soft rock or with extremely corroded bolts I would recommend removing the bolt entirely, taking off the hanger and then rethreading the bolt prior to hammering, so as to not create a dangerous situation where you can't remove the bolt but the hanger is still on so people could clip the compromised bolt. Sometimes funking the bolt and cone back towards the surface of the hole will help set the cone enough to unscrew as well, otherwise better have your grinder handy! I've had very little success with the hook tool on rusted bolts, method 2 looks very promising. Great video Greg!
Thanks for the beta Greg!
That was awesome, thanks for sharing this!
Great video. This is what I've always done, though recently I hit a challenge. The bolt was so rusted that the bolt would not spin independently of the cone, so I'm stuck just infinitely spinning the bolt. Do you have any suggestions for this situation?
I've run into this several times and it's pretty frustrating. I finally found a tactic today that worked though. I got an SDS to 1/4" hex adapter and plugged a little 1/2" nut driver head into that. Then I could use my drill to spin the bolt for several minutes, similar to how you would spin a wedge anchor. I spun both directions, bounce loaded the spinning bolt, etc, until it finally slid out.
In my case I think all the spinning and heat eventually broke the thread lock at the cone -- I still had to get the sleeve and cone out.
FYI I used the same adapter to help me get the cone out of another bolt hole today. I did this by removing the sleeve and then reinserting the bolt, then pulling while spinning with the drill. Nicer than what I usually end up doing, which is to just put in earplugs and drill out the entire mess with an old 3/8" SDS bit.
@@erichirst4976 thank you for the reply! I’ll try that.
Where do one get that tap?