Re: [time-nuts] SOPHOS discussion of GPS jamming and eLoran
> My apologies for the long link. Try this instead: https://nakedsecurity.sophos.com/2017/08/07/cyberattacks-on-gps-leave-ships-sailing-in-dangerous-waters Often when you see a long URL, or one full of strange numbers, it's encoded or encrypted personal tracking information. In this and many cases it's safe to delete everything that's part of the utm_source= keyword [1] and try again before you cut/paste the URL into a posting for time-nuts. Not only does it make the URL short and readable, but it also prevents your personal tracking information from being leaked to the mailing list and permanently to the web. /tvb [1] https://en.wikipedia.org/wiki/UTM_parameters - Original Message - From: "Bill Hawkins" To: "'Discussion of precise time and frequency measurement'" Sent: Monday, August 07, 2017 10:48 PM Subject: [time-nuts] SOPHOS discussion of GPS jamming and eLoran > SOPHOS is a European anti-malware company that publishes a daily > newsletter of oddities in the security world. > This article on jamming of S Korean GPS by N Korea may be of some > interest. > > https://nakedsecurity.sophos.com/2017/08/07/cyberattacks-on-gps-leave-sh > ips-sailing-in-dangerous-waters/?utm_source=Naked+Security+-+Sophos+List > &utm_campaign=f2c7691392-naked%252Bsecurity&utm_medium=email&utm_term=0_ > 31623bb782-f2c7691392-455148921 > > My apologies for the long link. You could try Googling the subject if > the link is broken up by your mailer. > > Bill Hawkins > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] SOPHOS discussion of GPS jamming and eLoran
SOPHOS is a European anti-malware company that publishes a daily newsletter of oddities in the security world. This article on jamming of S Korean GPS by N Korea may be of some interest. https://nakedsecurity.sophos.com/2017/08/07/cyberattacks-on-gps-leave-sh ips-sailing-in-dangerous-waters/?utm_source=Naked+Security+-+Sophos+List &utm_campaign=f2c7691392-naked%252Bsecurity&utm_medium=email&utm_term=0_ 31623bb782-f2c7691392-455148921 My apologies for the long link. You could try Googling the subject if the link is broken up by your mailer. Bill Hawkins ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] time-nuts Digest, Vol 157, Issue 11
On Mon, 07 Aug 2017 12:00:01 -0400, time-nuts-requ...@febo.com wrote: > -- > > Message: 2 > Date: Sun, 6 Aug 2017 15:56:33 -0500 > From: Chris Waldrup > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] Thunderbolt question > Message-ID: > Content-Type: text/plain; charset=utf-8 > > Thanks everyone. This has given me a lot of things to check as I > further investigate over the next few evenings. I'll let you know > what I find. > > Chris > >> On Aug 5, 2017, at 3:07 PM, Charles Steinmetz >> wrote: >> >> Arthur wrote: >> >>> I’d say it would be an MMIC amp similar to this device [Avago MGA-87563] >> >> If a chip similar to the Avago part Arthur referenced is what is >> installed, which seems plausible, the 0.749v on the RF input (Pin 3) >> is a fault and is caused by an external source of voltage (3.417v) >> imposed on the RF output (Pin 6) through the internal feedback >> resistor to Pin 3, attenuated by the gate resistor. >> >> Avago says this particular chip needs to have 0vDC at Pins 3 and 6, >> so if the connected parts would impose any DC voltage on those pins, >> external blocking capacitors must be used on Pins 3 and 6. You >> might check to see if there are blocking caps (at least at Pin 6), >> and if they are good. (Alternatively, the internal output capacitor >> from Pin 6 back to the output FET source may be bad.) >> >> Of course, don't expect a bad external cap to be the only other >> problem -- if it is bad, the 6-pin amp may well be bad, as well as >> whatever is connected to the other side of the cap. >> >> Best regards, >> >> Charles >> >> >> >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > - > > Message: 4 > Date: Mon, 7 Aug 2017 10:57:10 -0400 > From: Scott McGrath > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] Machining some aluminum help! > Message-ID: <22552004-20b8-4c3c-aa2d-4d3c4c57d...@gmail.com> > Content-Type: text/plain; charset=us-ascii > > I don't want to start a flame war here but I tend to take the > recommendations in Machinery's Handbook as the basis for process > decisions. > > for the last 75 years Machinery's Handbook recommend Kerosene as a > tapping fluid for Aluminum even for forming taps I'm not finding this. I'm looking at the 27th edition (2004), and on page 1147 they talk of tapping (by cutting) aluminum with various heavy oils or greases, and not kerosene. On page 1939, on cold-forming of threads, they say that one should use a good lubricating oil, versus a cutting fluid. Is there somewhere else I should look? > Btw if anyone here has a machinists tool box that odd rectangular > drawer is for your copy of Machinery's Handbook > > http://new.industrialpress.com/machinery-s-handbook-30th-edition-toolbox.html > > WD40 should not be used in any machining operation WD-40 is largely kerosene, with a bit of oil. It is widely used for machining aluminum, such a drilling with a hand drill, but not much as a circulating cutting fluid. > it was initially created for the USAF to remove water (WATER > DISPLACER formula 40) from missile parts which had gotten wet and to > leave behind a dry lubricant to prevent corrosion and force out water > via capillary action > > Thats why it works on seized fasteners the capillary action gets the > lube into the corrosion cells allowing fasteners to move All true. WD-40 is also good for softening self-stick labels that have become hard and brittle. Joe Gwinn > > Content by Scott > Typos by Siri >> On Aug 7, 2017, at 10:36 AM, Joseph Gwinn wrote: >> >>> On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-requ...@febo.com wrote: >>> >>> -- >>> >>> Message: 2 >>> Date: Sat, 29 Jul 2017 20:57:56 -0400 >>> From: Scott McGrath >>> To: Discussion of precise time and frequency measurement >>> >>> Subject: Re: [time-nuts] Machining some aluminum help! >>> Message-ID: >>> Content-Type: text/plain;charset=us-ascii >>> >>> Kerosine is a better tap lube for Aluminum as it is more persistent >>> and less flammable >> >> NO. Kerosene is *not* a good lubricant for _forming_ taps. >> >> Kerosene (WD-40) and alcohol are good lubricants for _cutting_. >> >> For _forming_, one needs something very viscous, something that >> lubricates at very high pressures, at the yield strength of the >> material being formed. >> >> Joe Gwinn >> >> >> >>> Content by Scott >>> Typos by Siri >>> > On Jul 29, 2017, at 6:41 PM, Joseph Gwinn wrote: > > On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-requ...@febo.com wrote: > Send time-nuts mailing list submissions to > time-nuts@febo.com >>
Re: [time-nuts] Machining some aluminum help!
Joseph wrote: For _forming_, one needs something very viscous, something that lubricates at very high pressures, at the yield strength of the material being formed. I've had excellent results with STP oil treatment, by itself or with added Tungsten disulfide. I frequently tap under power at 20-150 rpm, using Tapmatic self-reversing tapping heads. Best regards, Charles ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Machining some aluminum help!
On 8/7/17 7:36 AM, Joseph Gwinn wrote: On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-requ...@febo.com wrote: -- Message: 2 Date: Sat, 29 Jul 2017 20:57:56 -0400 From: Scott McGrath To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Machining some aluminum help! Message-ID: Content-Type: text/plain; charset=us-ascii Kerosine is a better tap lube for Aluminum as it is more persistent and less flammable NO. Kerosene is *not* a good lubricant for _forming_ taps. Kerosene (WD-40) and alcohol are good lubricants for _cutting_. For _forming_, one needs something very viscous, something that lubricates at very high pressures, at the yield strength of the material being formed. Like Molybdenum Disulfide or STP? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Machining some aluminum help!
I dont want to start a flame war here but I tend to take the recommendations in Machinery's Handbook as the basis for process decisions. for the last 75 years Machinerys Handbook recommend Kerosene as a tapping fluid for Aluminum even for forming taps Btw if anyone here has a machinists tool box that odd rectangular drawer is for your copy of Machinery's Handbook http://new.industrialpress.com/machinery-s-handbook-30th-edition-toolbox.html WD40 should not be used in any machining operation it was initially created for the USAF to remove water (WATER DISPLACER formula 40) from missile parts which had gotten wet and to leave behind a dry lubricant to prevent corrosion and force out water via capillary action Thats why it works on seized fasteners the capillary action gets the lube into the corrosion cells allowing fasteners to move Content by Scott Typos by Siri > On Aug 7, 2017, at 10:36 AM, Joseph Gwinn wrote: > >> On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-requ...@febo.com wrote: >> >> -- >> >> Message: 2 >> Date: Sat, 29 Jul 2017 20:57:56 -0400 >> From: Scott McGrath >> To: Discussion of precise time and frequency measurement >> >> Subject: Re: [time-nuts] Machining some aluminum help! >> Message-ID: >> Content-Type: text/plain;charset=us-ascii >> >> Kerosine is a better tap lube for Aluminum as it is more persistent >> and less flammable > > NO. Kerosene is *not* a good lubricant for _forming_ taps. > > Kerosene (WD-40) and alcohol are good lubricants for _cutting_. > > For _forming_, one needs something very viscous, something that > lubricates at very high pressures, at the yield strength of the > material being formed. > > Joe Gwinn > > > >> Content by Scott >> Typos by Siri >> On Jul 29, 2017, at 6:41 PM, Joseph Gwinn wrote: On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-requ...@febo.com wrote: Send time-nuts mailing list submissions to time-nuts@febo.com Message: 7 Date: Fri, 28 Jul 2017 14:11:09 -0700 From: "Gary E. Miller" To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Machining some aluminum help! Message-ID: <20170728141109.71aad...@spidey.rellim.com> Content-Type: text/plain; charset="utf-8" Yo cdel...@juno.com! On Fri, 28 Jul 2017 12:46:30 -0700 wrote: > After mounting the tap in the drill > press and putting a dab of Crisco on the tap I was able to tap each > hole to a depth of 7/16" as fast as I could turn the handwheel! Cool! I suggest you get some real cutting fluid. The threads will be smoother. >>> >>> I second that. What I use is a lubricant wax made by Lenox, the saw >>> maker. It's intended for metal-cutting band saws, but works just >>> splendid for form taps. There are many equivalents. >>> >>> By the way, when drilling aluminum, use denatured alcohol as the >>> cutting fluid. This will prevent aluminum gumming up the cutting edge >>> of the drill. >>> >>> And, as others have mentioned, one does not use the same size drill for >>> forming taps as for cutting taps. The diameter accuracy required can >>> only be achieved by using the correct number (versus fractional) drill >>> bit size. Do not use Chinese drill bits - steel not good enough. US, >>> Japan, Germany et al are OK. >>> >>> Joe Gwinn >>> >>> RGDS GARY > --- > >> >> End of time-nuts Digest, Vol 156, Issue 38 >> ** > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Machining some aluminum help!
On Sat, 29 Jul 2017 22:49:10 -0400, time-nuts-requ...@febo.com wrote: > > -- > > Message: 2 > Date: Sat, 29 Jul 2017 20:57:56 -0400 > From: Scott McGrath > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] Machining some aluminum help! > Message-ID: > Content-Type: text/plain; charset=us-ascii > > Kerosine is a better tap lube for Aluminum as it is more persistent > and less flammable NO. Kerosene is *not* a good lubricant for _forming_ taps. Kerosene (WD-40) and alcohol are good lubricants for _cutting_. For _forming_, one needs something very viscous, something that lubricates at very high pressures, at the yield strength of the material being formed. Joe Gwinn > Content by Scott > Typos by Siri > >> On Jul 29, 2017, at 6:41 PM, Joseph Gwinn wrote: >> >>> On Sat, 29 Jul 2017 12:00:02 -0400, time-nuts-requ...@febo.com wrote: >>> Send time-nuts mailing list submissions to >>>time-nuts@febo.com >>> >>> Message: 7 >>> Date: Fri, 28 Jul 2017 14:11:09 -0700 >>> From: "Gary E. Miller" >>> To: Discussion of precise time and frequency measurement >>> >>> Subject: Re: [time-nuts] Machining some aluminum help! >>> Message-ID: <20170728141109.71aad...@spidey.rellim.com> >>> Content-Type: text/plain; charset="utf-8" >>> >>> Yo cdel...@juno.com! >>> >>> On Fri, 28 Jul 2017 12:46:30 -0700 >>> wrote: >>> After mounting the tap in the drill press and putting a dab of Crisco on the tap I was able to tap each hole to a depth of 7/16" as fast as I could turn the handwheel! >>> >>> >>> Cool! >>> >>> I suggest you get some real cutting fluid. The threads will be smoother. >> >> I second that. What I use is a lubricant wax made by Lenox, the saw >> maker. It's intended for metal-cutting band saws, but works just >> splendid for form taps. There are many equivalents. >> >> By the way, when drilling aluminum, use denatured alcohol as the >> cutting fluid. This will prevent aluminum gumming up the cutting edge >> of the drill. >> >> And, as others have mentioned, one does not use the same size drill for >> forming taps as for cutting taps. The diameter accuracy required can >> only be achieved by using the correct number (versus fractional) drill >> bit size. Do not use Chinese drill bits - steel not good enough. US, >> Japan, Germany et al are OK. >> >> Joe Gwinn >> >> >>> RGDS >>> GARY >>> --- > > End of time-nuts Digest, Vol 156, Issue 38 > ** ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
