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Aileron bellcrank countersink

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lwinger

Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA

Posted: Sun Jul 08, 2007 6:50 pm Post subject: Aileron bellcrank countersink

This should be a simple question for you scratch builders.  Where did you get the countersink for 6-W-10-2 (bellcrank spacers)?  What model number/part number?  It needs to be able to bevel for an AN426 rivet head in 1/4 aluminum.



I did a test using a countersink I had for woodworking, and at that depth it began to "chatter" and it made an irregular edge.

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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger

planecrazydld(at)yahoo.co
Guest

Posted: Mon Jul 09, 2007 2:40 am Post subject: Aileron bellcrank countersink

any standard aircraft (100°) csk will do. That having been said - I would only consider countersinking using a microstop and the appropriate piloted bits.



lwinger <larrywinger(at)gmail.com> wrote:[quote] --> Zenith-List message posted by: "lwinger" 



This should be a simple question for you scratch builders.  Where did you get the countersink for 6-W-10-2 (bellcrank spacers)?  What model number/part number?  It needs to be able to bevel for an AN426 rivet head in 1/4 aluminum.



I did a test using a countersink I had for woodworking, and at that depth it began to "chatter" and it made an irregular edge.



--------

Larry Winger

Tustin, CA

601XL/Corvair from scratch

Control surfaces and wing spars complete





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planejim(at)bellsouth.net
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Posted: Mon Jul 09, 2007 4:41 am Post subject: Aileron bellcrank countersink

Larry,



Be aware that there are countersinks with different angles. The standard 

aircraft one is 100 degrees. You will find them with different numbers of 

flutes - standard is three. There are 120 degree countersinks although they 

are scarce. In fact the  Avex rivets we use are ( the flush type ) are 120 

degrees. Wood countersinks are 82 degrees ( if my memory serves me 

correctly - might have the wrong number - they are different than aircraft 

types ).Just make sure the one you are using is sharp. If it has been use on 

steel and then use it on aluminum, you won't be happy.



Someone ( I missed the name ) stated that you should use a microstop with 

piloted bits. These are great and allow precise repeatablity once adjusted 

and locked up. The big drawback with these is that they are expensive, 

especially if you only have a few holes to do. Try to borrow one rather than 

buying one. I've used a drill press ( with the stop set ) and a simple 100 

degree countersink to do fairly precise countersinks on parts you can get in 

place and clamped at the drill press. Experiment on scrap metal and you will 

do a good job.



do not archive



Jim Hoak



---

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planecrazydld(at)yahoo.co
Guest

Posted: Mon Jul 09, 2007 8:27 am Post subject: Aileron bellcrank countersink

eBay is great source for Microstops. i have about a half dozen, never paid more than $10 including shipping for any of them. I did get one with bad bearings...



Jim Hoak <planejim(at)bellsouth.net> wrote:  [quote]--> Zenith-List message posted by: "Jim Hoak" 



Larry,



Be aware that there are countersinks with different angles. The standard 

aircraft one is 100 degrees. You will find them with different numbers of 

flutes - standard is three. There are 120 degree countersinks although they 

are scarce. In fact the Avex rivets we use are ( the flush type ) are 120 

degrees. Wood countersinks are 82 degrees ( if my memory serves me 

correctly - might have the wrong number - they are different than aircraft 

types ).Just make sure the one you are using is sharp. If it has been use on 

steel and then use  it on aluminum, you won't be happy.



Someone ( I missed the name ) stated that you should use a microstop with 

piloted bits. These are great and allow precise repeatablity once adjusted 

and locked up. The big drawback with these is that they are expensive, 

especially if you only have a few holes to do. Try to borrow one rather than 

buying one. I've used a drill press ( with the stop set ) and a simple 100 

degree countersink to do fairly precise countersinks on parts you can get in 

place and clamped at the drill press. Experiment on scrap metal and you will 

do a good job.



do not archive



Jim Hoak



---

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lwinger

Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA

Posted: Tue Jul 10, 2007 3:44 am Post subject: Re: Aileron bellcrank countersink

Thanks for all the responses.  Once again, the list comes through!



Do not archive.

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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger

maarten versteeg

Joined: 15 May 2007
Posts: 37
Location: San Antonio

Posted: Tue Jul 10, 2007 5:59 am Post subject: Aileron bellcrank countersink

Hello,



But these countersinks are made in the 1/4 in thick aluminum,

I made them using a sharp woodworking countersunk in the drill

press and they came out fine. I managed to control the "chatter"

by picking a slow speed and controlling the pressure. I don't

think a microstop is needed in this material, the proper depth

can easily be measured and there is no danger of drilling too

deep.



regards,

	Maarten,

         601XL plans building wings



 	  Quote: 	
		   Time: 03:40:30 AM PST US

 From: David Downey <planecrazydld(at)yahoo.com>

 

 any standard aircraft (100) csk will do. That having been said - I would only consider

 countersinking using a microstop and the appropriate piloted bits.

 

 This should be a simple question for you scratch builders.  Where did you get the

 countersink for 6-W-10-2 (bellcrank spacers)?  What model number/part number?

 It needs to be able to bevel for an AN426 rivet head in 1/4 aluminum.

 

 I did a test using a countersink I had for woodworking, and at that depth it began

 to "chatter" and it made an irregular edge.

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_________________
Maarten Versteeg
601XL scratch building wings

planecrazydld(at)yahoo.co
Guest

Posted: Tue Jul 10, 2007 7:52 am Post subject: Aileron bellcrank countersink

there is a MAJOR issue here: the included angle of the "wood working" csk and the AN426/MS20426 are not at all compatible. This is the worst condition in a driven flush head rivet of all the possible error conditions. The rim of the rivet head is seated but the head to shank region is gapped - and awful (and blind to inspect until after failure) condition structurally.



Maarten Versteeg <maarten.versteeg(at)swri.org> wrote:  [quote]--> Zenith-List message posted by: Maarten Versteeg 



Hello,



But these countersinks are made in the 1/4 in thick aluminum,

I made them using a sharp woodworking countersunk in the drill

press and they came out fine. I managed to control the "chatter"

by picking a slow speed and controlling the pressure. I don't

think a microstop is needed in this material, the       Take the Internet to Go: Yahoo!Go puts the [url=http://us.rd.yahoo.com/evt=48253/*http://mobile.yahoo.com/go?refer=1GNXIC]Internet in your pocket:[/url] mail, news, photos & more.  [quote][b]

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lwinger

Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA

Posted: Tue Jul 10, 2007 9:52 am Post subject: Re: Aileron bellcrank countersink

For the record, Brown Tool came to the rescue again.  I just ordered the #21 pilot 100 degree countersink (CC021) for $4.95 and the standard cage microstop (CC01-USA) for $21.95.  John was very helpful, and I expect to be doing more business with them in the future.



Thanks again to the list for solid advice.

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_________________
Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger

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