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bit sizes

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JHearnsberger

Joined: 22 Dec 2009
Posts: 31
Location: Springhill, LA

Posted: Sun Jan 17, 2010 7:51 am Post subject: bit sizes

I am getting ready to drill on the rear spar. I am confused about the bit sizes. I see that #30 is not the same as 1/8". But, they look fairly close.



Can you use #30 for 1/8", #40 for 3/32", and #10 for 3/16"? 



Or when the say use 1/8" drill, use 1/8"?



Thanks,



Jake

john(at)trollingers.com
Guest

Posted: Sun Jan 17, 2010 8:43 am Post subject: bit sizes

they are not the same.  



1/8th = .125

#30 = .1285



use what the plans call for, it does make a difference



On Sun, Jan 17, 2010 at 10:51 AM, JHearnsberger <jakehearnsberger(at)gmail.com (jakehearnsberger(at)gmail.com)> wrote:

 [quote]--> RV10-List message posted by: "JHearnsberger" <jakehearnsberger(at)gmail.com (jakehearnsberger(at)gmail.com)>

  

 I am getting ready to drill on the rear spar. I am confused about the bit sizes. I see that #30 is not the same as 1/8". But, they look fairly close.

 

 Can you use #30 for 1/8", #40 for 3/32", and #10 for 3/16"?

 

 Or when the say use 1/8" drill, use 1/8"?

 

 Thanks,

 

 Jake

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=281903#281903

 

 

 

 

 

 

 

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 http://forums.matronics.com

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 le, List Admin.

 ="_blank">http://www.matronics.com/contribution

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 [b]

JHearnsberger

Joined: 22 Dec 2009
Posts: 31
Location: Springhill, LA

Posted: Sun Jan 17, 2010 8:48 am Post subject: Re: bit sizes

I'm learning. Thank you.

Phil.Perry(at)netapp.com
Guest

Posted: Sun Jan 17, 2010 8:52 am Post subject: bit sizes

Jake,



The numbered bits are slightly larger than the fractional.



You'll initially drill all of your holes with a fractional bit.  3/32,

1/8, etc....  That process is referred to as "Match Drilling" in Van's

plans.  This means you're getting all the parts in the proper position

and drilling an undersized pilot hole to get the parts to align and

"Match".



After you've accomplished "Match Drilling", then you "Final Drill".



This is the process where you use the numbered drill sizes to slightly

enlarge the hole to the proper size.



You'll want to pay close attention to the terms "match" vs "final" when

you're reading the plans.



I believe there's a little more detail in Section 5 on this topic.  It's

not bundled inside your larger plans book, but is a smaller book that

came in its own folder with the kit.  Mine came with a red cover....



Phil



--

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Sun Jan 17, 2010 9:06 am Post subject: bit sizes

Get a drill size chart so you can see the decimal size.  This way you know 

what is smaller.  A lot of times you need to first drill the hole undersize 

with the 3/32 or 1/8 then move to the number drills.  Usually the number 

drills are the last drill size you will use for rivets, bolts etc.

---

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Sun Jan 17, 2010 9:11 am Post subject: Re: bit sizes

Jake,

Take a look at any books that might have been included with the tool kit you might have purchased. They should have a good description of drills, as well as some kind of table for reference.

I would suggest you look into a box set of #1 thru #60. Here are two sites to start:

http://www.panamericantool.com/products.cfm    look for part 16-401



http://www.aircraftspruce.com/catalog/topages/drillbitset.php



With shipping, you'll spend between $75-$80 for 60 bits in a stylish box; a good deal by any standard for drill bits.



John

_________________
#40572 Phase One complete in 2011

dlm46007(at)cox.net
Guest

Posted: Sun Jan 17, 2010 10:32 am Post subject: bit sizes

Should use the bit called; also buy the 6" bits so that the drill angle will

be more apparent. IIRC 30 slightly larger than 1/8". Size 4 rivet will be

tight.  



--

partner14

Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas

Posted: Sun Jan 17, 2010 11:24 am Post subject: bit sizes

Jake, as usual, you've been given some great information.... but, as a once upon a time machinist, one of the the first things I would recommend for all builders, is the purchase of a pair of digital or dial calipers.  They will not only save you tons of time during the build, you should/could ck each drill for it's size prior to each use.  You will never use the wrong drill if you ck it with the calipers first.  Most of us old guys can't read the damn number/fractions on the drills anyway.  The whole match drill final drill process is to first insure alignment, and then if not final drilled, a 3/32 rivet will not go into a 3/32 hole... ok, if it does, it won't go willingly.... and if we're going to set 10,000 plus of the dang things, then we want them to go willingly.

 Jake, where are you located?  If close enough, I'd fly over and give you a quick lesson and the many uses of the calipers.  (Pascal, does this ring any bells)  A good example is making bushings/spacers, most people would lay a scale/tape measure of sorts onto the tubing and scribe a line.... with the calipers you just set the desired dimension, lock the caliper, and use the calipers as your scribe.  Same measurement, every time.

 Don McDonald 



--- On Sun, 1/17/10, Perry, Phil <Phil.Perry(at)netapp.com> wrote:



 [quote]

From: Perry, Phil <Phil.Perry(at)netapp.com>

Subject: RE: bit sizes

To: rv10-list(at)matronics.com

Date: Sunday, January 17, 2010, 8:50 AM



 --> RV10-List message posted by: "Perry, Phil" <Phil.Perry(at)netapp.com (Phil.Perry(at)netapp.com)>



Jake,



The numbered bits are slightly larger than the fractional.



You'll initially drill all of your holes with a fractional bit.  3/32,

1/8, etc....  That process is referred to as "Match Drilling" in Van's

plans.  This means you're getting all the parts in the proper position

and drilling an undersized pilot hole to get the parts to align and

"Match".



After you've accomplished "Match Drilling", then you "Final Drill".



This is the process where you use the numbered drill sizes to slightly

enlarge the hole to the proper size.



You'll want to pay close attention to the terms "match" vs "final" when

you're reading the plans.



I believe there's a little more  detail in Section 5 on this topic.  It's

not bundled inside your larger plans book, but is a smaller book that

came in its own folder with the kit.  Mine came with a red cover....



Phil



--

_________________
Don A. McDonald
40636

pitts_pilot(at)bellsouth.
Guest

Posted: Sun Jan 17, 2010 2:58 pm Post subject: bit sizes

Harbor freight had digital calipers for $16 but they go on sale 

regularly.  Buy a couple.

Linn



Don McDonald wrote:

[quote] Jake, as usual, you've been given some great information.... but, as a 

 once upon a time machinist, one of the the first things I would 

 recommend for all builders, is the purchase of a pair of digital or dial 

 calipers.  They will not only save you tons of time during the build, 

 you should/could ck each drill for it's size prior to each use.  You 

 will never use the wrong drill if you ck it with the calipers first.  

 Most of us old guys can't read the damn number/fractions on the drills 

 anyway.  The whole match drill final drill process is to first insure 

 alignment, and then if not final drilled, a 3/32 rivet will not go into 

 a 3/32 hole... ok, if it does, it won't go willingly.... and if we're 

 going to set 10,000 plus of the dang things, then we want them to go 

 willingly.

 Jake, where are you located?  If close enough, I'd fly over and give you 

 a quick lesson and the many uses of the calipers.  (Pascal, does this 

 ring any bells)  A good example is making bushings/spacers, most people 

 would lay a scale/tape measure of sorts onto the tubing and scribe a 

 line.... with the calipers you just set the desired dimension, lock the 

 caliper, and use the calipers as your scribe.  Same measurement, every time.

 Don McDonald 

 

 --- On *Sun, 1/17/10, Perry, Phil /<Phil.Perry(at)netapp.com>/* wrote:

 

 

     From: Perry, Phil <Phil.Perry(at)netapp.com>

     Subject: RE: bit sizes

     To: rv10-list(at)matronics.com

     Date: Sunday, January 17, 2010, 8:50 AM

 

     

     <Phil.Perry(at)netapp.com

     <http://us.mc537.mail.yahoo.com/mc/compose?to=Phil.Perry(at)netapp.com>>

 

     Jake,

 

     The numbered bits are slightly larger than the fractional.

 

     You'll initially drill all of your holes with a fractional bit.  3/32,

     1/8, etc....  That process is referred to as "Match Drilling" in Van's

     plans.  This means you're getting all the parts in the proper position

     and drilling an undersized pilot hole to get the parts to align and

     "Match".

 

     After you've accomplished "Match Drilling", then you "Final Drill".

 

     This is the process where you use the numbered drill sizes to slightly

     enlarge the hole to the proper size.

 

     You'll want to pay close attention to the terms "match" vs "final" when

     you're reading the plans.

 

     I believe there's a little more detail in Section 5 on this topic.  It's

     not bundled inside your larger plans book, but is a smaller book that

     came in its own folder with the kit.  Mine came with a red cover....

 

     Phil

 

 

 

     --

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Sun Jan 17, 2010 3:11 pm Post subject: bit sizes

Because they are bound to break from HF



Sent from my iPhone



On Jan 17, 2010, at 15:58, Linn Walters <pitts_pilot(at)bellsouth.net>  

wrote:



[quote] 

 >



 Harbor freight had digital calipers for $16 but they go on sale  

 regularly.  Buy a couple.

 Linn



 Don McDonald wrote:

> Jake, as usual, you've been given some great information.... but,  

> as a once upon a time machinist, one of the the first things I  

> would recommend for all builders, is the purchase of a pair of  

> digital or dial calipers.  They will not only save you tons of time  

> during the build, you should/could ck each drill for it's size  

> prior to each use.  You will never use the wrong drill if you ck it  

> with the calipers first.  Most of us old guys can't read the damn  

> number/fractions on the drills anyway.  The whole match drill final  

> drill process is to first insure alignment, and then if not final  

> drilled, a 3/32 rivet will not go into a 3/32 hole... ok, if it  

> does, it won't go willingly.... and if we're going to set 10,000  

> plus of the dang things, then we want them to go willingly.

> Jake, where are you located?  If close enough, I'd fly over and  

> give you a quick lesson and the many uses of the calipers.   

> (Pascal, does this ring any bells)  A good example is making  

> bushings/spacers, most people would lay a scale/tape measure of  

> sorts onto the tubing and scribe a line.... with the calipers you  

> just set the desired dimension, lock the caliper, and use the  

> calipers as your scribe.  Same measurement, every time.

> Don McDonald --- On *Sun, 1/17/10, Perry, Phil /<Phil.Perry(at)netapp.com 

> >/* wrote:

>    From: Perry, Phil <Phil.Perry(at)netapp.com>

>    Subject: RE: bit sizes

>    To: rv10-list(at)matronics.com

>    Date: Sunday, January 17, 2010, 8:50 AM

>    

>    <Phil.Perry(at)netapp.com

>    <http://us.mc537.mail.yahoo.com/mc/compose?to=Phil.Perry(at)netapp.com 

> >>

>    Jake,

>    The numbered bits are slightly larger than the fractional.

>    You'll initially drill all of your holes with a fractional bit.   

> 3/32,

>    1/8, etc....  That process is referred to as "Match Drilling" in  

> Van's

>    plans.  This means you're getting all the parts in the proper  

> position

>    and drilling an undersized pilot hole to get the parts to align  

> and

>    "Match".

>    After you've accomplished "Match Drilling", then you "Final  

> Drill".

>    This is the process where you use the numbered drill sizes to  

> slightly

>    enlarge the hole to the proper size.

>    You'll want to pay close attention to the terms "match" vs  

> "final" when

>    you're reading the plans.

>    I believe there's a little more detail in Section 5 on this  

> topic.  It's

>    not bundled inside your larger plans book, but is a smaller book  

> that

>    came in its own folder with the kit.  Mine came with a red  

> cover....

>    Phil

>    --

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

deej(at)deej.net
Guest

Posted: Sun Jan 17, 2010 3:51 pm Post subject: bit sizes

 	  Quote: 	
		  > 

>

> Harbor freight had digital calipers for $16 but they go on sale

> regularly.  Buy a couple.


	


 	  Quote: 	
		   



 Because they are bound to break from HF




	


	My digital caliper from Harbor Freight is over 4 years old now and

still works fine.  I think I paid $10 for it.  Even if they do break

eventually, the price is cheap enough that you can just buy another one.



	I bought four of their digital multimeters at $3 a pop thinking they

would also break easily.  Guess what, I'm still using the first one that

I opened four years ago, still working fine too.



-Dj

Strasnuts

Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT

Posted: Sun Jan 17, 2010 4:21 pm Post subject: Re: bit sizes

I guess I just have bad luck there.  Everything I have bought from there didn't last long.  I'm a caveman though, I can break anything.  My wife told me I should be the test dummy for garden tools because I have broke all of ours.  

Do the digital calipers stay accurate?  

Same reason I don't like Craftsmen.  I tried to return my ratchets and they are always out because everyone else is returning their ratchets. I will pay extra to have something that I don't have to return or go back and re-purchase.

What it comes down to is that I don't know what lasts and doesn't last at Harbor Freight.

_________________
40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours

ricksked(at)cox.net
Guest

Posted: Sun Jan 17, 2010 4:43 pm Post subject: bit sizes

Snap-On.....you don't dare want to break! them...same great warranty though...

---

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