|
Posted by Nigel Eaton on April 9, 2008, 7:03 pm
Please log in for more thread options
>
>> Hi all I think that the government will soon be making left hand
>> drills compulsory in order to put a new twist on the hole they have
>> gotten us into
>
>Don't you need a left hand drill if you're gonna tap a reverse thread
>into something?
<sigh>
OK, look, I'm probably going to get in trouble for telling you this...
You know those times when you pick up the wrong drill bit? You go for
the 5/32 and you grab an 11/64 by mistake and your arms aren't long
enough to read the faded markings on the bit?
Yes. Those times.
Well, then you need the LH bits.
Pop an 11.64 *LH* bit in the drill, reverse the motor and have at it.
You may have to make a couple of passes (particularly in harder
materials), but eventually you'll put it all back. If you're careful you
can even get a pretty good finish (although that's hard in some grades
of stainless, be careful that it doesn't unwork-harden. You want to be
laying down at least .002" per pass).
There.
Now the secret's out.
--
Nigel
When the only tools you have are a Bridgeport, a CNC Taig Mill, a Colchester
and assorted other stuff, every problem looks like a steam engine.
|
|
Posted by Tony Jeffree on April 10, 2008, 1:41 am
Please log in for more thread options
On Thu, 10 Apr 2008 00:03:02 +0100, Nigel Eaton
>>
>>> Hi all I think that the government will soon be making left hand
>>> drills compulsory in order to put a new twist on the hole they have
>>> gotten us into
>>
>>Don't you need a left hand drill if you're gonna tap a reverse thread
>>into something?
>
><sigh>
>
>OK, look, I'm probably going to get in trouble for telling you this...
>
>You know those times when you pick up the wrong drill bit? You go for
>the 5/32 and you grab an 11/64 by mistake and your arms aren't long
>enough to read the faded markings on the bit?
>
>Yes. Those times.
>
>Well, then you need the LH bits.
>
>Pop an 11.64 *LH* bit in the drill, reverse the motor and have at it.
>
>You may have to make a couple of passes (particularly in harder
>materials), but eventually you'll put it all back. If you're careful you
>can even get a pretty good finish (although that's hard in some grades
>of stainless, be careful that it doesn't unwork-harden. You want to be
>laying down at least .002" per pass).
>
>There.
>
>Now the secret's out.
Similar principle to the microwave freezer then <G>
Regards,
Tony
|
|
Posted by John on April 12, 2008, 5:22 am
Please log in for more thread options > <sigh>
>
> OK, look, I'm probably going to get in trouble for telling you this...
>
> You know those times when you pick up the wrong drill bit? You go for
> the 5/32 and you grab an 11/64 by mistake and your arms aren't long
> enough to read the faded markings on the bit?
>
> Yes. Those times.
>
> Well, then you need the LH bits.
>
> Pop an 11.64 *LH* bit in the drill, reverse the motor and have at it.
>
> You may have to make a couple of passes (particularly in harder
> materials), but eventually you'll put it all back. If you're careful you
> can even get a pretty good finish (although that's hard in some grades
> of stainless, be careful that it doesn't unwork-harden. You want to be
> laying down at least .002" per pass).
>
> There.
>
> Now the secret's out.
>
> --
> Nigel
So it's a putting on tool then.
John
|
|
Posted by Tony Jeffree on April 12, 2008, 6:09 am
Please log in for more thread options On Sat, 12 Apr 2008 02:22:43 -0700 (PDT), John
>So it's a putting on tool then.
Thats right...it un-drills holes.
Regards,
Tony
|
|
Posted by Trevor Jones on April 9, 2008, 9:08 pm
Please log in for more thread options Richard Edwards wrote:
> Amongst my collection I have a 7/16th Left Hand Twist drill.
> What would this have ever been used for. First that I have ever seen.
>
> --
>
> Richard
>
> Email address is valid but remove burrs before sending!
Used in multi spindle drilling machines, some of which have counter
rotating spindles.
Handy for drilling out broken off bolts or studs, as they sometimes
catch, and wind the stub out of the hole. Not much good in a keyless
chuck, though.
If you should happen across a catalog for a proper tool dealer, like
as not, they will have some.
Cheers
Trevor Jones
|
| Similar Threads | Posted | | Re: Anyone got a 2 BA left hand threaded machine screw? | September 13, 2006, 1:14 pm |
| Where can I buy decent large hand files? | September 22, 2006, 5:34 pm |
| FA: Adept No2 hand operated shaper | May 14, 2008, 5:06 pm |
| Drill press for normal drill | September 28, 2006, 10:46 am |
| Meddings drill repair | January 20, 2008, 10:28 am |
| Meddings Pillar Drill | February 24, 2008, 5:51 am |
| Drill Stands wanted | September 28, 2006, 7:49 pm |
| Sharpening carbide drill bit | May 11, 2008, 7:43 am |
| Goofed, broken drill into workpiece :-(( | March 22, 2008, 2:22 pm |
| Slot drill / End mill with radiused tip | March 31, 2008, 7:58 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap