Battery tray lightening holes TIP!

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cjensen
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Battery tray lightening holes TIP!

Post by cjensen »

I am posting this in the screw up chronicals because after the tool I found today, I feel like I screwed up last night! :wink:

I read a lot of websites to find the best way to cut the lightening holes in the battery box. Most people have used fly cutters or hole saws. Well, following what worked for others, I started out by using a metal cutting hole saw. I thought it was going to work fine when it began cutting thru the powdercoating. That ended quickly when the teeth hit the stainless steel. After an hour went by, I had two holes VERY roughly cut, and a ruined hole saw. I began the third hole with that hole saw, and then switched to my fly cutter. I must have a cheap fly cutter or something, because that only lasted about 20 minutes before it was junk. I ended up sawing thru that third hole with a box cutter (the SS was pretty thin). At that point, I became rather frustrated with the whole thing, and quit.

This is the crappy result-
Image

Today, I found the solution...and the TIP to pass along! Greenlee punches (if you have them, or access to them...they are expensive!) I also highly recommend a hydraulically actuated punch piston, but that's a bit over the top for a home tool. Our avionics shop has a whole set of Greenlee punches, AND the hydraulic actuator! This was SO FREAKIN' EASY that I could kick myself for not thinking of this last night!

Here's the setup...

Image

The punch sliced thru the SS like a hot knife on a stick of butter...the hole on the left was just done-

Image

At the end of the day, I had ALL the holes done, and the other NINE holes took a total of 20 minutes!! Now, it would take a bit longer without the hydraulic actuator, but using a socket or wrench with the punch would be dramatically faster.

I did put lightening holes in the sides of the box, which is not in the plans, but I saw the sides of the box as being HEAVY, so I put cut 'em out!

Image

8)
Chad Jensen
Missing my RV-7...
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Mike Balzer
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Battery Tray Lightening Holes

Post by Mike Balzer »

Looks like you did a good job. I used a similar method for lightening up my tail kit by using dies that make a hole and flare it at the same time by squeezing the dies in a vice.

Nice Work,

Mike Balzer
It is better to be on the ground wishing you were in the air, then being in the air and wishing you were on the ground. N78MB

Spike
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Post by Spike »

Ill remember that when I get there. Ill just run down to my employer's shop and use theirs ..... uh ...... err ..... maybe not!

Must be nice Chad !!
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Brantel
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Post by Brantel »

Did the same but I was not lucky enough to have a hydraulic puller. Mine use a wrench to turn!
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cjensen
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Post by cjensen »

Spike wrote:Ill remember that when I get there. Ill just run down to my employer's shop and use theirs ..... uh ...... err ..... maybe not!

Must be nice Chad !!
It is. And I realize that that particular tool won't be available to many, but the tip was the Greenlee punch...not the actuator... :wink: :) I just found this tool SO COOL, that I had to share it! 8)
Chad Jensen
Missing my RV-7...
Vertical Power support
920.216.3699
http://verticalpower.com

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RV7Factory
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Post by RV7Factory »

Note to self... send battery box and a 6-pack of fruity beer to Chad. :P
Brad Oliver
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cjensen
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Post by cjensen »

RV7Factory wrote:Note to self... send battery box and a 6-pack of fruity beer to Chad. :P
Works for me! I had fun using that tool! 8)
Chad Jensen
Missing my RV-7...
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http://verticalpower.com

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rv8or
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Post by rv8or »

RV7Factory wrote:Note to self... send battery box and a 6-pack of fruity beer to Chad. :P


HA!

:rofl:


J
Joe Ferraro
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weezbad
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Post by weezbad »

thats what i used and it was effortless.
william....don't let it beat you down, you are stronger than you think.

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