Today's Message Index:
----------------------
1. 08:59 AM - Countersink Bit for 4-40 Screw (Garey Wittich)
2. 11:49 AM - Re: Countersink Bit for 4-40 Screw (Jeff Luckey)
3. 12:09 PM - Re: Countersink Bit for 4-40 Screw (vanremog@aol.com)
4. 12:11 PM - Re: Countersink Bit for 4-40 Screw (Larry Bowen)
5. 12:25 PM - Re: Countersink Bit for 4-40 Screw (Jeff Luckey)
6. 04:45 PM - Re: Countersink Bit for 4-40 Screw (Warren Brecheisen)
7. 04:57 PM - Re: Countersink Bit for 4-40 Screw (sheldon barrett)
8. 05:05 PM - Re: Countersink Bit for 4-40 Screw (sheldon barrett)
9. 05:33 PM - Re: Countersink Bit for 4-40 Screw (Robert Savage)
10. 06:33 PM - Matt's RV-8 Rebuild... (Matt Dralle)
11. 06:42 PM - Auto-response (Viorel Nichols)
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Subject: | Countersink Bit for 4-40 Screw |
Happy Holidays:=0A=0ALooking for Countersink Bit for 4-40 Screw that fits i
n a Microstop. -The Pilot Bit (Guide Pin) has to be 0.089" Dia so the fin
ished screw hole after countersinking can be TAPPED for the 4-40 screw thre
ads !!!! -Where can I buy a 4-40 Countersink Bit with a guide pin of 0.08
9" Dia -or any suggestions as how to do this -?=0A=0AI took a normal -3
Rivet Countersink Bit and had a friend turn the Guide Pin down from 0.098"
Dia to 0.089" Dia. -I tried this and it did NOT work as the cutting flut
es of the Countersink Bit did NOT extend all the way to the reduced diamete
r Guide Pin which is now 0.089" Dia. -Also tried a normal Debarring Tool
Bit, but it "chattered" because of no Guide Pin to keep it centered on the
0.089" Dia hole - result very poor.=0A=0AAppreciate any suggestions !!!!
-=0A=0AMANY THANKS,=0A=0AGarey Wittich - -RV-8A Builder
Message 2
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Subject: | Countersink Bit for 4-40 Screw |
Garey,
I'm working from memory here, but I think that the countersink geometry
between a rivet and a standard flat-head screw is different. The
countersinks that I have for my microstop have the rivet geometry, so even
if your mod to the countersink worked, the screw head probably would not
seat properly in that countersink hole. (I think the difference in geometry
is about 15 degrees, so it may not matter in your application.)
You should be able to use a 'standard' non-aviation-geometry countersink. I
regularly use one in a drill press to countersink thick aluminum. Cutter
RPM is important to prevent chatter.
-Jeff
_____
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Garey Wittich
Sent: Saturday, December 29, 2012 08:59
Subject: RV-List: Countersink Bit for 4-40 Screw
Happy Holidays:
Looking for Countersink Bit for 4-40 Screw that fits in a Microstop. The
Pilot Bit (Guide Pin) has to be 0.089" Dia so the finished screw hole after
countersinking can be TAPPED for the 4-40 screw threads !!!! Where can I
buy a 4-40 Countersink Bit with a guide pin of 0.089" Dia or any
suggestions as how to do this ?
I took a normal -3 Rivet Countersink Bit and had a friend turn the Guide Pin
down from 0.098" Dia to 0.089" Dia. I tried this and it did NOT work as the
cutting flutes of the Countersink Bit did NOT extend all the way to the
reduced diameter Guide Pin which is now 0.089" Dia. Also tried a normal
Debarring Tool Bit, but it "chattered" because of no Guide Pin to keep it
centered on the 0.089" Dia hole - result very poor.
Appreciate any suggestions !!!!
MANY THANKS,
Garey Wittich RV-8A Builder
No virus found in this message.
Checked by AVG - www.avg.com
Message 3
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Subject: | Re: Countersink Bit for 4-40 Screw |
Just to confuse things further, countersinks for AN solid rivets are 100deg
, for pop rivets they are 120deg and for screws they can be 82deg, 90deg or
100deg depending on whether they are either of the two types of SAE or met
ric.
-GV
-----Original Message-----
From: Jeff Luckey <JLuckey@pacbell.net>
Sent: Sat, Dec 29, 2012 11:49 am
Subject: RE: RV-List: Countersink Bit for 4-40 Screw
Garey,
I=99m working from memory here, but Ithink that the countersink geome
try between a rivet and a standard flat-headscrew is different. The counte
rsinks that I have for my microstop havethe rivet geometry, so even if your
mod to the countersink worked, the screwhead probably would not seat prope
rly in that countersink hole. (I thinkthe difference in geometry is about
15 degrees, so it may not matter in yourapplication.)
You should be able to use a =98standard=99non-aviation-geometry
countersink. I regularly use one in a drill pressto countersink thick alu
minum. Cutter RPM is important to preventchatter.
-Jeff
From:owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matron
ics.com] On Behalf Of Garey Wittich
Sent: Saturday, December 29, 201208:59
Subject: RV-List: Countersink Bitfor 4-40 Screw
HappyHolidays:
Looking for Countersink Bit for 4-40 Screwthat fits in a Microstop. The Pi
lot Bit(Guide Pin) has to be 0.089" Dia so the finished screw hole aftercou
ntersinking can be TAPPED for the 4-40 screw threads !!!! Wherecan I buy a
4-40 Countersink Bit with a guide pin of 0.089" Dia orany suggestions as
how to do this ?
I took a normal -3 Rivet Countersink Bitand had a friend turn the Guide Pin
down from 0.098" Dia to 0.089"Dia. I tried this and it did NOT work as th
e cutting flutes of theCountersink Bit did NOT extend all the way to the re
duced diameter Guide Pinwhich is now 0.089" Dia. Also tried a normal Debar
ring Tool Bit, butit "chattered" because of no Guide Pin to keep it centere
d on the0.089" Dia hole - result very poor.
Appreciate any suggestions !!!!
MANY THANKS,
Garey Wittich RV-8A Builder
www.aeroelectric.com
www.buildersbooks.com
www.homebuilthelp.com
http://www.matronics.com/contribution
http://www.matronics.com/Navigator?RV-List
http://forums.matronics.com
No virus found in this message.
Checked by AVG - www.avg.com
12/28/12
Message 4
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Subject: | Re: Countersink Bit for 4-40 Screw |
Maybe you can shorten the pilot on the #40 countersink so it's almost not
there -- just enough to do the job. Then after countersinking drill
additional depth at 0.089 and tap for the screw.
Or, use #6 screw instead. 4's aren't very durable.
--
Larry Bowen
Larry@BowenAero.com
http://BowenAero.com
On Sat, Dec 29, 2012 at 11:59 AM, Garey Wittich
<gareywittich2000@yahoo.com>wrote:
> Happy Holidays:
>
> Looking for Countersink Bit for 4-40 Screw that fits in a Microstop. *The
> Pilot Bit (Guide Pin) has to be 0.089" Dia so the finished screw hole after
> countersinking can be TAPPED for the 4-40 screw threads !!!! *Where can
> I buy a 4-40 Countersink Bit with a guide pin of 0.089" Dia or any
> suggestions as how to do this ?
>
> I took a normal -3 Rivet Countersink Bit and had a friend turn the Guide
> Pin down from 0.098" Dia to 0.089" Dia. I tried this and it did NOT work
> as the cutting flutes of the Countersink Bit did NOT extend all the way to
> the reduced diameter Guide Pin which is now 0.089" Dia. Also tried a
> normal Debarring Tool Bit, but it "chattered" because of no Guide Pin to
> keep it centered on the 0.089" Dia hole - result very poor.
>
> Appreciate any suggestions !!!!
>
> MANY THANKS,
>
> Garey Wittich RV-8A Builder
>
> *
>
> *
>
>
Message 5
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Subject: | Countersink Bit for 4-40 Screw |
GV - thanks for filling-in the numbers.
-Jeff
_____
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of vanremog@aol.com
Sent: Saturday, December 29, 2012 12:08
Subject: Re: RV-List: Countersink Bit for 4-40 Screw
Just to confuse things further, countersinks for AN solid rivets are 100deg,
for pop rivets they are 120deg and for screws they can be 82deg, 90deg or
100deg depending on whether they are either of the two types of SAE or
metric.
-GV
-----Original Message-----
From: Jeff Luckey <JLuckey@pacbell.net>
Sent: Sat, Dec 29, 2012 11:49 am
Subject: RE: RV-List: Countersink Bit for 4-40 Screw
Garey,
I'm working from memory here, but I think that the countersink geometry
between a rivet and a standard flat-head screw is different. The
countersinks that I have for my microstop have the rivet geometry, so even
if your mod to the countersink worked, the screw head probably would not
seat properly in that countersink hole. (I think the difference in geometry
is about 15 degrees, so it may not matter in your application.)
You should be able to use a 'standard' non-aviation-geometry countersink. I
regularly use one in a drill press to countersink thick aluminum. Cutter
RPM is important to prevent chatter.
-Jeff
_____
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com
<mailto:owner-rv-list-server@matronics.com?> ] On Behalf Of Garey Wittich
Sent: Saturday, December 29, 2012 08:59
Subject: RV-List: Countersink Bit for 4-40 Screw
Happy Holidays:
Looking for Countersink Bit for 4-40 Screw that fits in a Microstop. The
Pilot Bit (Guide Pin) has to be 0.089" Dia so the finished screw hole after
countersinking can be TAPPED for the 4-40 screw threads !!!! Where can I
buy a 4-40 Countersink Bit with a guide pin of 0.089" Dia or any
suggestions as how to do this ?
I took a normal -3 Rivet Countersink Bit and had a friend turn the Guide Pin
down from 0.098" Dia to 0.089" Dia. I tried this and it did NOT work as the
cutting flutes of the Countersink Bit did NOT extend all the way to the
reduced diameter Guide Pin which is now 0.089" Dia. Also tried a normal
Debarring Tool Bit, but it "chattered" because of no Guide Pin to keep it
centered on the 0.089" Dia hole - result very poor.
Appreciate any suggestions !!!!
MANY THANKS,
Garey Wittich RV-8A Builder
www.aeroelectric.com
www.buildersbooks.com
www.homebuilthelp.com
http://www.matronics.com/contribution
http://www.matronics.com/Navigator?RV-List
http://forums.matronics.com
No virus found in this message.
Checked by AVG - www.avg.com
12/28/12
_blank">www.aeroelectric.com
" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
_blank">http://www.matronics.com/contribution
t="_blank">http://www.matronics.com/Navigator?RV-List
tp://forums.matronics.com
No virus found in this message.
Checked by AVG - www.avg.com
Message 6
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Subject: | Countersink Bit for 4-40 Screw |
I ran into this a couple of times on my -6. I simply used a pilotless
countersink with the correct angle. I used a hand hole deburring tool
that
accepts tools with the =BC-20 thread (same as microstops). I went
slowly and
carefully, checking the result often and making corrections as I went.
I
did not use any 4-40 screws on structural components. If you are using
them
on your wings tips, my method is probably too labor intensive to
complete in
a reasonable amount of time. I used 6-32=92s on the tips.
Warren
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Subject: | Re: Countersink Bit for 4-40 Screw |
I used 4-40s' on the tips (the kit came with the countersink) but I
forgot who supplied the kit... But it was for wingtip install...
However, I agree, use 6-32's instead...
Sheldon
----- Original Message -----
From: Warren Brecheisen
To: rv-list@matronics.com
Sent: Saturday, December 29, 2012 5:44 PM
Subject: RE: RV-List: Countersink Bit for 4-40 Screw
I ran into this a couple of times on my -6. I simply used a pilotless
countersink with the correct angle. I used a hand hole deburring tool
that accepts tools with the =BC-20 thread (same as microstops). I went
slowly and carefully, checking the result often and making corrections
as I went. I did not use any 4-40 screws on structural components. If
you are using them on your wings tips, my method is probably too labor
intensive to complete in a reasonable amount of time. I used 6-32's on
the tips.
Warren
Message 8
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Subject: | Re: Countersink Bit for 4-40 Screw |
I used 4-40s' on the tips (the kit came with the countersink) but I
forgot who supplied the kit... But it was for wingtip install...
However, I agree, use 6-32's instead...
Sheldon
----- Original Message -----
From: Warren Brecheisen
To: rv-list@matronics.com
Sent: Saturday, December 29, 2012 5:44 PM
Subject: RE: RV-List: Countersink Bit for 4-40 Screw
I ran into this a couple of times on my -6. I simply used a pilotless
countersink with the correct angle. I used a hand hole deburring tool
that accepts tools with the =BC-20 thread (same as microstops). I went
slowly and carefully, checking the result often and making corrections
as I went. I did not use any 4-40 screws on structural components. If
you are using them on your wings tips, my method is probably too labor
intensive to complete in a reasonable amount of time. I used 6-32's on
the tips.
Warren
Message 9
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Subject: | Re: Countersink Bit for 4-40 Screw |
Here's a link to Cleveland Tool and their kit for wing tip attachment. I
used this kit and their dimple die for the wing aluminum. I used a hand
tool for countersinking the fiberglass. It is pricey though and time
consuming but the result was very nice. I also used their #4
nutplate jig.
http://www.cleavelandtool.com/prodinfo.asp?number=WHS220#.UN-WVKywXTo
Bob
From: sheldonb@frontiernet.net
Subject: Re: RV-List: Countersink Bit for 4-40 Screw
I used 4-40s' on the tips (the kit came with the
countersink) but I forgot who supplied the kit... But it was for wingtip
install... However=2C I agree=2C use 6-32's instead...
Sheldon
----- Original Message -----
From:
Warren Brecheisen
To: rv-list@matronics.com
Sent: Saturday=2C December 29=2C 2012 5:44
PM
Subject: RE: RV-List: Countersink Bit for
4-40 Screw
I ran into this a couple of times on my
-6. I simply used a pilotless countersink with the correct angle.
I used a hand hole deburring tool that accepts tools with the =BC-20 thre
ad
(same as microstops). I went slowly and carefully=2C checking the result
often and making corrections as I went. I did not use any 4-40 screws on
structural components. If you are using them on your wings tips=2C my
method is probably too labor intensive to complete in a reasonable amount
of
time. I used 6-32=92s on the tips.
Warren
href="http://www.aeroelectric.com">www.aeroelectric.com
href="http://www.buildersbooks.com">www.buildersbooks.com
href="http://www.homebuilthelp.com">www.homebuilthelp.com
href="http://www.matronics.com/contribution">http://www.matronics.com/chr
ef="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/
Navigator?RV-List
href="http://forums.matronics.com">http://forums.matronics.com
Message 10
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Subject: | Matt's RV-8 Rebuild... |
Dear fellow RV Builders and Flyers,
I've been working hard on the RV-8 rebuild over the holidays and thought I'd share.
Here the current status as of December 28 2012 on the new RV-8 2.0. This
quick video highlights the new instrument panel including the recently finished
cockpit audio output for the video camera. Line level output from the airplane's
intercom is routed out through the RCA outputs in the rear of the cabin
through some matching circuitry in the gold RCA connectors up to the camera's
Mic input. The matching seems to be working pretty well. The audio in the video
is coming right from the intercom and includes a mix of the intercom voice,
the music or DVD output from the Kenwood stereo, and the audio output from the
Garmin SL-30 Com unit (aircraft communications radio). Yet to be wired in is
the audio outputs from the EFIS's, the VP-200, and the ADS600B. Note also that
the video output from the camera is also routed in though the new A/V panel and
then out through the headrest LCD display for the passenger. The video is also
available on the pilot's Kenwood display. Everything is working pretty nicely.
I'm particularly pleased with the new A/V panel I/O.
Matt's HD YouTube Video:
http://www.youtube.com/watch?v=6xrTKAuDEyI&feature=share&list=PLB2F39639392A90DE
-
Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 120+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
Message 11
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Away on holiday from the 22 December 2012 till 29 January 2013
Wishing you a happy festive season .
Merry Christmas and a Happy New Year
from
Viorel ...
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