Left handed Cobalt drill bits
Discussion
If you're just drilling a hole, I doubt a LH drill bit exists.
What would be the point ?
Or are you referring to an actual combined drill/extraction tool ?
Just drill with a cobalt bit to make a hole, then use the extraction tool.
If you absolutely must use a 2 in 1 tool, the likes of Snap On probably do a set, at a usual Snap On price.
What would be the point ?
Or are you referring to an actual combined drill/extraction tool ?
Just drill with a cobalt bit to make a hole, then use the extraction tool.
If you absolutely must use a 2 in 1 tool, the likes of Snap On probably do a set, at a usual Snap On price.
G600 said:
Why do the need to be left handed?
I'm told that if your using a left handed bit half the time the bolt your trying to drill out will spin out as the bit digs in thus saving you time. (The other half it works like a normal drill bit but you've not lost anything)US Ebay is full of the things, not so much here. I may well just buy some cobalt right handed bits and do it the old fashioned way.
A few for sale on UK Ebay:
http://www.ebay.co.uk/sch/i.html?rt=nc&LH_Pref...
Sorry, not Cobalt though.
Snap-on do a full kit with loads of drills, long and short easy-out thingies, I can get the part number if you want it, but it's probably over £100.
You have my sympathies, I had to do this last week insitu and it's a b
h of a job. If the head is off a lot easier and someone with a spark eroder will do it much better too.
I had LHD(!) bits and all the Snap-on gubbins and it took hours to get two out, the LHD bits do stand a chance of snagging and winding the stud out, but it rarely happens and you need to be applying a heck of a lot of pressure for it to work like that.
A new drill, slow drill speed, plenty of cutting fluid and pressure are key here.
http://www.ebay.co.uk/sch/i.html?rt=nc&LH_Pref...
Sorry, not Cobalt though.
Snap-on do a full kit with loads of drills, long and short easy-out thingies, I can get the part number if you want it, but it's probably over £100.
You have my sympathies, I had to do this last week insitu and it's a b
h of a job. If the head is off a lot easier and someone with a spark eroder will do it much better too.I had LHD(!) bits and all the Snap-on gubbins and it took hours to get two out, the LHD bits do stand a chance of snagging and winding the stud out, but it rarely happens and you need to be applying a heck of a lot of pressure for it to work like that.
A new drill, slow drill speed, plenty of cutting fluid and pressure are key here.
[quote=(steven)]
I'm told that if your using a left handed bit half the time the bolt your trying to drill out will spin out as the bit digs in thus saving you time. (The other half it works like a normal drill bit but you've not lost anything)
US Ebay is full of the things, not so much here. I may well just buy some cobalt right handed bits and do it the old fashioned way.
[/quote]
Ah ok doesn't sound any more effective than an easy out though.
I'm told that if your using a left handed bit half the time the bolt your trying to drill out will spin out as the bit digs in thus saving you time. (The other half it works like a normal drill bit but you've not lost anything)
US Ebay is full of the things, not so much here. I may well just buy some cobalt right handed bits and do it the old fashioned way.
[/quote]
Ah ok doesn't sound any more effective than an easy out though.
[quote=(steven)]
I'm told that if your using a left handed bit half the time the bolt your trying to drill out will spin out as the bit digs in thus saving you time. (The other half it works like a normal drill bit but you've not lost anything)
US Ebay is full of the things, not so much here. I may well just buy some cobalt right handed bits and do it the old fashioned way.
[/quote]
Someone was giving you bad advice, if the studs are tight, a biting drill bit will not spin them out. A screw/stud extractor is the standard way of getting out sheared bolts or studs, good luck and I hope you get them out.
I'm told that if your using a left handed bit half the time the bolt your trying to drill out will spin out as the bit digs in thus saving you time. (The other half it works like a normal drill bit but you've not lost anything)
US Ebay is full of the things, not so much here. I may well just buy some cobalt right handed bits and do it the old fashioned way.
[/quote]
Someone was giving you bad advice, if the studs are tight, a biting drill bit will not spin them out. A screw/stud extractor is the standard way of getting out sheared bolts or studs, good luck and I hope you get them out.
steve j said:
Someone was giving you bad advice, if the studs are tight, a biting drill bit will not spin them out. A screw/stud extractor is the standard way of getting out sheared bolts or studs, good luck and I hope you get them out.
bks I had two studs do exactly that with left handed drillsGassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff