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Drill bits

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Grotto25/05/2019 10:02:00
122 forum posts
71 photos

I recently bought a bunch of drill bits and when sorting through them found a few are left hand.

I'll be able to use them in my mill, but wondered why they are made. I guess there’s a good reason, just can’t think of it. Anyone know why?

Michael Gilligan25/05/2019 10:05:11
13998 forum posts
608 photos

One good use is for drilling-out broken right hand threaded screws.


Simon Williams 325/05/2019 10:07:42
412 forum posts
67 photos

Hoard them carefully, and wait for the day you need to drill out a broken off bolt in something completely irreplaceable. They are absolutely brilliant at catching the remnant bolt, at which point it unscrews itself out of the blind hole like magic. Better than an easi-out any day.

Don't use them in a keyless chuck - many such won't hold in reverse. A keyed chuck (generally) will.

Rgds Simon

Edit - MichaelG types faster than I.

Edited By Simon Williams 3 on 25/05/2019 10:08:40

Circlip25/05/2019 10:30:38
977 forum posts

They may have come from a flat pack furniture manufacturer. On multi drilling heads, some of the drill "chucks" rotate in reverse due to the centre spacing.

Regards Ian.

Mark P.25/05/2019 10:32:47
603 forum posts
6 photos

Loads on ebay.

Mark P.

Andrew Johnston25/05/2019 11:03:55
4855 forum posts
544 photos

Some production lathes normally run in reverse, like my Britan, so left hand drills are standard.


roy entwistle25/05/2019 11:11:20
1033 forum posts

Drilling left handed holes obviously


JohnF25/05/2019 11:48:26
864 forum posts
102 photos

Boley made a capstan lathe similar I guess to Andrews Britan, also ran in reverse with the toolbox/holder at the rear thus LH drills we needed


larry phelan 125/05/2019 17:36:27
501 forum posts
11 photos

Never thought about drilling left hand holes !!!

True,you learn something new every day.

Keep them coming.

V8Eng25/05/2019 17:44:26
1314 forum posts
28 photos

Don’t forget to use left hand threaded taps with them.wink

duncan webster25/05/2019 23:57:10
2231 forum posts
32 photos

Then you'll need a left handed spanner to wind the bolts in

Jeff Dayman26/05/2019 00:49:12
1621 forum posts
40 photos

As mentioned on an earlier thread, left handed drills are very handy for working on the port engines of twin screw ships, and also LHD cars as used in North America. By the way Duncan, most mechanics' toolboxes in the North America are fully stocked with left handed wrenches of various types, a few of which can be used on right handed fasteners also.....not sure about toolboxes in the UK......

Simon Williams 326/05/2019 07:35:59
412 forum posts
67 photos

If you want to drill two holes which are truly independent of each other, drill one left hand and the other right hand.

Because the left hand never knows what the right hand is doing

roy entwistle26/05/2019 09:24:13
1033 forum posts

Left handed spanners are easy to recognize, left handed screwdrivers are not as easy especially cross point ones


Mike Poole26/05/2019 10:31:34
2108 forum posts
51 photos

Can you fill a hole with left handed drill? Could be useful for a hole drilled in the wrong place.wink


roy entwistle26/05/2019 14:16:32
1033 forum posts

Mike Now you're just being silly

Roy laugh

Jeff Dayman28/05/2019 00:59:43
1621 forum posts
40 photos

Hold on Roy, Mike is on to something. I'm pretty sure if I put a 1/8" dia left hand drill in the electrode holder of my old Lincoln 225 arc welder I can fill a hole ..... as long as the ground lead and clamp are in place on the plate with the hole! smile

roy entwistle28/05/2019 09:22:42
1033 forum posts

Jeff OK I'll hold my hands up


Mike Poole28/05/2019 09:33:10
2108 forum posts
51 photos
Posted by roy entwistle on 26/05/2019 14:16:32:

Mike Now you're just being silly

Roy laugh

Guilty I’m afraid.


Hollowpoint28/05/2019 09:48:59
216 forum posts
28 photos

Maybe they are Australian? To counter that they are upside down and spinning the wrong way? 😄

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