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Drillbit extensions

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poneill(at)irealms.com
Guest

Posted: Mon Oct 08, 2007 12:52 am Post subject: Drillbit extensions

I'm planning to enlarge the wiring run holes in the QB wings in the next

week or two and I am trying to locate a source for a drill bit extension

that will accommodate the unibit's 3/8" shank.  I can find many 1/4" and

7/16" shank extensions, but so far I have found none for a bit with 3/8"

shank.



The ones I have been looking at are the 12" or 18" extensions (planned on

using several as required) with Allen head screws to secure the bit in the

extension.  I don't believe an extension for a 7/16" shank would work

because of the difficulties centering the bit.  The last thing I want is a

crazed unibit wreaking havoc inside the wings.



I know some homegrown solutions were discussed here not long ago, but does

anyone have a good recommendation or online source for such extensions?



Best Regards,

Patrick #40715

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tomhanaway

Joined: 12 Aug 2006
Posts: 111
Location: Murphy, NC

Posted: Mon Oct 08, 2007 1:49 am Post subject: Re: Drillbit extensions

I just went through this on my 10 QB wings.  The other issue is that any head that holds a 3/8 shank is bigger than the max 3/4" recommended hole.



Avery tools makes a 12" extension where the size of the head has been cut down to just fit through the 3/4" hole yet it holds a 3/8" shank.  Works great.  Plus, although not necessary for this portion of the project, you can easily extend the 12" extension with standard 1/4 " extenders since the shank of the Avery tool is 1/4".



Of course, if you live in South Florida, you're welcome to borrow mine :^)



Tom Hanaway

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johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Mon Oct 08, 2007 6:58 am Post subject: Re: Drillbit extensions

Patrick,

I just finished that step. Instead of enlarging, I put in another set of holes. Here's how I did it. First, made a template so they would line up. In the open bays, I used a #30 to start a pilot hole, then followed up with a unibit to 3/8". This size is perfect for a #4 snap bushing. Instead of the unibit I got from Avery, I went to the Home Depot Aviation Supply Store and bought a #1 unibit, which has a 1/4" shank. It was easier to use in my smaller Sioux drill (it fits in a bay).



For the areas that have been skinned, I started a pilot hole in the wing root rib using the same template with a #30. I marked the next rib with the template and then pulled out the 12 inch long #30 I got from Avery. Once the second rib is drilled, the two holes acted as a guide for the rest. You do need to pull the inspection port a little further in, but you get the picture.



Next, I went to the Ace Hardware Aviation Supply Store and bought a metal cutting 12 inch long 3/8" drill bit. After using the unibit on the wing root pilot hole, I switched over to the long 3/8" bit and it went like a dream. Used my hand held cordless set to a high speed because the shank is 3/8".



If you have already skinned everything in, the outer bays could still be done with the shank extensions you talked about. Using the smaller #1 unibit, you could assemble it in place between each rib. Drill the hole, disassemble, and repeat. Hope this helps.



John

 	  poneill(at)irealms.com wrote: 	
		  I'm planning to enlarge the wiring run holes in the QB wings in the next

week or two and I am trying to locate a source for a drill bit extension

that will accommodate the unibit's 3/8" shank.  I can find many 1/4" and

7/16" shank extensions, but so far I have found none for a bit with 3/8"

shank.



The ones I have been looking at are the 12" or 18" extensions (planned on

using several as required) with Allen head screws to secure the bit in the

extension.  I don't believe an extension for a 7/16" shank would work

because of the difficulties centering the bit.  The last thing I want is a

crazed unibit wreaking havoc inside the wings.



I know some homegrown solutions were discussed here not long ago, but does

anyone have a good recommendation or online source for such extensions?



Best Regards,

Patrick #40715

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
#40572 Phase One complete in 2011

Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Mon Oct 08, 2007 7:40 am Post subject: Re: Drillbit extensions

Patrick,



I used an extension I got from Avery tools and but a metric Unibit in. I drilled the holes to the perfect size so that the Vans conduits fitted nicely once you got it in.



http://www.averytools.com/p-533-6-12-step-drill-extensions.aspx



check out my website

www.wellenzohn.net



Michael

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_________________
RV-10 builder (flying)
#511

poneill(at)irealms.com
Guest

Posted: Tue Oct 09, 2007 5:19 am Post subject: Drillbit extensions

So Avery has one eh? How in the heck did I miss that.  I thought I made all

the rounds to check the preferred places.



How many extensions did you end up needing (Avery + how many regular 12") to

get all the ribs under the QB attached bottom skins?



Also where do they caution against using larger than 3/4" hole?  I've seen

others use and was thinking about running the Van's nylon conduit and I

think it requires a bit larger than that.



Unfortunately, I'm in So-Cal otherwise I'd take you up on the offer and put

an end to this item!



Best Regards,

Patrick #40715



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poneill(at)irealms.com
Guest

Posted: Tue Oct 09, 2007 5:25 am Post subject: Drillbit extensions

Hi Michael,



What size hole did you end up drilling for the Van's conduit?



Also what did you do if anything to secure the conduit in place?



Thanks!



Best Regards,

Patrick #40715



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poneill(at)irealms.com
Guest

Posted: Tue Oct 09, 2007 5:37 am Post subject: Drillbit extensions

Hi John,



I didn't consider that a smaller Unibit might have a smaller shank.  Very

helpful!



How did you go about making a template?  I was thinking about making a

second conduit run for most of the wire runs and using the one called for in

the plans for the strobe.  I'm not quite sure how to make the most effective

template for this.  That would certainly simplify things.



But that does help a lot, thank you very much.



Best Regards,

Patrick #40715



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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Tue Oct 09, 2007 10:35 am Post subject: Re: Drillbit extensions

Patrick,



the unibit is I guess 22mm in diameter and I could enlarge the holes slightly so that the conduit fitted just through with some pulling and bending. It is now caught in the holes and doesn't move at all so it is not necessary to secure it.



Michael



(VP-200 arrived   )

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#511

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