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Air vent mount

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mhubel

Joined: 05 Sep 2009
Posts: 141

Posted: Sun Jul 25, 2010 6:23 am Post subject: Air vent mount

Has anyone made the 3.25 inch hole in the canopy for snap in air vents? 

I would like to know what is the best method to use to do this given 

that one can not do it in a drill press. The plastic is under a slight 

stress so the idea of using a normal hole saw seems a bit risky. I worry 

about a crack forming in the plastic and quickly growing.



-- 

Mark Hubelbank

NorthEast Monitoring

2 Clock Tower Place

Suite 555

Maynard, MA, 01754 - USA

mhubel(at)nemon.com

978-443-3955

_________________
Mark Hubelbank
N708HU
CH601XL
Jabiru 3300
Rotec TBI 40-3 carb
Sensenich ground adj prop.
240 hr TAF
Pictures at photo.hubbles.com

Jon(at)joncroke.com
Guest

Posted: Sun Jul 25, 2010 7:05 am Post subject: Air vent mount

---

jaybannist(at)cs.com
Guest

Posted: Sun Jul 25, 2010 7:11 am Post subject: Air vent mount

Mark,

 

 I used a drill bit made for acrylics and drilled a 1/4" hole in the center.  Then I used a Dremel with a small spiral drum cutter, with the Dremel mounted on their device made to cut circles and cut to the finish line.  I had tried to cut a circle with the Dremel just hand held on a scrap and it didn't go so good.  The Dremel circle cutter device made it a piece of cake.  I went really slow to keep the melting to a minimum, but still had to sandpaper a little bit to get a real smooth hole.

 

 Hope; this helps - Jay Bannister

    

 

  

  --> Zenith601-List message posted by: Mark Hubelbank <mhubel(at)nemon.com (mhubel(at)nemon.com)> 

    

   Has anyone made the 3.25 inch hole in the canopy for snap in air vents?  I would like to know what is the best method to use to do this given  that one can not do it in a drill press. The plastic is under a slight  stress so the idea of using a normal hole saw seems a bit risky. I worry  about a crack forming in the plastic and quickly growing. 

   

   

    

     

    [quote][b]

craig(at)craigandjean.com
Guest

Posted: Sun Jul 25, 2010 8:22 am Post subject: Air vent mount

I watched Doug Dugger at Quality Sport Planes cut the hole in his 601XL

canopy. He did it by manually turning a hand-held fly cutter. As I recall he

used WD-40 as a lubricant. It might help to cut from both sides, I can't

recall.



-- Craig 



--

tigerrick(at)mindspring.c
Guest

Posted: Sun Jul 25, 2010 8:58 am Post subject: Air vent mount

Rich Vetterli did his by using a hole saw, turned by hand from both sides, centered on a .25" hole from a plexi drill. It took awhile, but it did turn out nicely, and there were no cracks.

--

mhubel

Joined: 05 Sep 2009
Posts: 141

Posted: Mon Jul 26, 2010 8:55 am Post subject: Air vent mount

Thanks to all who have replied.



It sounds like a toss up between the hand operated hole saw and a 

dremmel tool with a hole adapter. I assume the trick with a hole saw is 

to cut very slowly using very little pressure. That sounds safe enough.



On 07/25/2010 12:58 PM, Rick Lindstrom wrote:

[quote] 



 Rich Vetterli did his by using a hole saw, turned by hand from both sides, centered on a .25" hole from a plexi drill. It took awhile, but it did turn out nicely, and there were no cracks.

 --

_________________
Mark Hubelbank
N708HU
CH601XL
Jabiru 3300
Rotec TBI 40-3 carb
Sensenich ground adj prop.
240 hr TAF
Pictures at photo.hubbles.com

craig(at)craigandjean.com
Guest

Posted: Mon Jul 26, 2010 9:33 am Post subject: Air vent mount

Remember there are hole saws (cylinder with multiple teeth) and fly cutters

(adjustable arm with a single cutting tooth like a lathe tool):



http://www.osborneatelier.com/images/T004_fly_cutter.JPG



-- Craig



--

mhubel

Joined: 05 Sep 2009
Posts: 141

Posted: Mon Jul 26, 2010 12:32 pm Post subject: Air vent mount

Craig.

     I do have both. My conclusion is that fly cutters are only to be 

used when nothing else will work, and in a drill press and if you can't 

find any way to avoid it.



On 07/26/2010 1:32 PM, Craig Payne wrote:

[quote] 



 Remember there are hole saws (cylinder with multiple teeth) and fly cutters

 (adjustable arm with a single cutting tooth like a lathe tool):



 http://www.osborneatelier.com/images/T004_fly_cutter.JPG



 -- Craig



 --

_________________
Mark Hubelbank
N708HU
CH601XL
Jabiru 3300
Rotec TBI 40-3 carb
Sensenich ground adj prop.
240 hr TAF
Pictures at photo.hubbles.com

jaybannist(at)cs.com
Guest

Posted: Mon Jul 26, 2010 12:48 pm Post subject: Air vent mount

Mark,

 

 The only way to use a fly cutter, either on thin aluminum or acrylic plastic is to hold and turn it by hand.  It takes a LONG time with either material, but it will work.

 

 Jay

  

     

  

    

 

  --

craig(at)craigandjean.com
Guest

Posted: Mon Jul 26, 2010 1:08 pm Post subject: Air vent mount

OK, just remember that I'm talking about turning it in your hand, not

chucked in a hand drill. I agree that a fly cutter in a hand drill is a

recipe for disaster. But when I saw Doug use it as a hand tool for his vent

it did the job with no fuss or cracking.



-- Craig 



--

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