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aprazer

Joined: 24 Nov 2006
Posts: 93
Location: Boise, Idaho

Posted: Wed Jun 13, 2007 8:05 am Post subject: Vent cuttingVent cutting

OK, I give up! What is a flycutter tool and how is it used?

Mack

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The poh-oh-unemployed farm boy from Idaho

Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Wed Jun 13, 2007 8:34 am Post subject: Re: Vent cuttingVent cutting

Something like this   http://www.aircraftspruce.com/catalog/topages/holecutter.php



I prefer the type that doesn't use the drill bit - it simply has a center shaft the same size from end to end.  You have to drill the pilot hole first and then use the fly cutter.  With thick stuff and a drill press you can turn it under power otherwise the best approach is to turn it by hand and score the material.  In the attached picture I made a inspection hole by:



1.) Scoring the metal by hand with the fly cutter.  This is in the leading edge skin.

2.) Using an OLFA knife (see www.601.org) to score a line connecting the edges of the two circles.

3.) Used a step drill to enlarge one of the pilot holes large enough to insert a nibbler tool which I used to split one end enough that I could get my pliers on a scored edge and...

4.) Carefully worked my way around the hole, separating the the pieces I wanted to remove.



There.... that's more of an answer than you probably wanted  



Tim

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Hole-cutter.jpg

Description:

Removing metal that was scored with a hole cutter.

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CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
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larry(at)macsmachine.com
Guest

Posted: Wed Jun 13, 2007 10:25 am Post subject: Vent cuttingVent cutting

Hi Mack,

The type we're usually talking about on this forum is a short 3/4-inch 

body with a stem on one end for a drill chuck,

a hole for a 1/4-inch drill at the other with two Allen screws to hold 

the drill and in the middle a square hole that allows

a beam to pass thru, be adjusted and secured with another Allen screw.  

At the end of the beam, a square hole

parallel with the drill is made for an 1/8th inch tool bit that's ground 

from the inside edge to obtain a hole with a

straight edge.  The drill can be used to power it, but for lightening 

holes in the wings or fuselage, I prefer to pre-drill

the center hole and then turn the fly-cutter by hand very slowly with 

light pressure to cut a hole somewhat like a compass.

In a drill press, you can cut really good holes in an instrument panel 

rather quickly. About $12.00 locally.



Larry McFarland  601HDS at www.macsmachine.com

Mack Kreizenbeck wrote:

 	  Quote: 	
		   



 OK, I give up! What is a flycutter tool and how is it used?

 Mack

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aprazer

Joined: 24 Nov 2006
Posts: 93
Location: Boise, Idaho

Posted: Wed Jun 13, 2007 4:36 pm Post subject: Re: Vent cuttingVent cutting

Tim and Larry,

Thank you very much for the picture and description. In reading the thread, it appears that this flycutter can be used on the bubble! Micheal Heintz cut a round hole in bubble of the XL prototype, but I forgot to quiz him about his method. Idaho gets extremely hot during the summers and I need additional air.

Thanks again for your help

Mack

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The poh-oh-unemployed farm boy from Idaho

craig(at)craigandjean.com
Guest

Posted: Wed Jun 13, 2007 7:56 pm Post subject: Vent cuttingVent cutting

 	  Quote: 	
		   In reading the thread, it appears that this flycutter can be used on the

bubble!
	




I think most would agree that it is best to turn a fly cutter by hand if you

can't use it in a drill press. Same goes for cutting holes with it in sheet

aluminum.



-- Craig

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