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holes, drill bits, reamers and bolts

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Carlos Sa

Joined: 13 Jan 2006
Posts: 96

Posted: Mon Apr 24, 2006 5:48 pm Post subject: holes, drill bits, reamers and bolts

Hello, fellow listers

Once again, I have managed to create problems where no one has created before!



I got reamers of the proper sizes (5/16" and 3/8") to drill the wing attach plates (CH601-HD),

and the alphabetic size drills to go with them (N and U).



So, tonight I made some holes in some scrap material, for practice.

I expected the bolt to fit very tightly, but nope! They go through easily. Not too loose, but not

tight. Same with both sizes.

Then, for comparison, I made a hole with a regular 3/8" drill bit, and the results were similar,

if not a bit tighter!



Am I doing something wrong, or is the difference supposed to be that subtle?



Here's how I made the holes: started with small drill bit and replaced it with a large one. Drill

hole and repeat. 



Below is the sequence for each final size.



Hole for AN5 (5/16"): 1/8", 13/64", 1/4", then N.



Hole for AN6 (3/8"): 1/8", 13/64", 1/4", N, then U.



Hole for AN6 (3/8"), no reamer: 1/8", 3/64", 1/4", N then 3/8"



Note that the material was clamped to the drill press table all the time. I did have to lower the

table one or two inches in order to mount the reamers. This is the only thing I can think could

have thrown the process off track.



One more question: to avoid the adjustment step, I could cut the reamer's shank. Does anyone see

a problem with this?



Thanks in advance for your toughts / comments / blank stares.

Carlos

CH601-HD, plans

working on a concept of infinity applied to time.

	



	

		

Lche-vitrine ou lche-cran ?

magasinage.yahoo.ca

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_________________
CH601-HD, plans
Montreal, Canada

cgalley(at)qcbc.org
Guest

Posted: Mon Apr 24, 2006 7:29 pm Post subject: holes, drill bits, reamers and bolts

Did you mike the bolts?

---

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rjscep(at)yahoo.com
Guest

Posted: Mon Apr 24, 2006 7:29 pm Post subject: holes, drill bits, reamers and bolts

 	  Quote: 	
		   Carlos, there is another way. Try using close 

 tolerence AN bolts. They may solve your problem. Bob


	


--- Carlos Sa <carlosfsa(at)yahoo.com> wrote:



 	  Quote: 	
		   

 <carlosfsa(at)yahoo.com>

 

 Hello, fellow listers

 

 

 Once again, I have managed to create problems where

 no one has created before!

 

 I got reamers of the proper sizes (5/16" and 3/8")

 to drill the wing attach plates (CH601-HD),

 and the alphabetic size drills to go with them (N

 and U).

 

 So, tonight I made some holes in some scrap

 material, for practice.

 I expected the bolt to fit very tightly, but nope!

 They go through easily. Not too loose, but not

 tight. Same with both sizes.

 Then, for comparison, I made a hole with a regular

 3/8" drill bit, and the results were similar,

 if not a bit tighter!

 

 Am I doing something wrong, or is the difference

 supposed to be that subtle?

 

 Here's how I made the holes: started with small

 drill bit and replaced it with a large one. Drill

 hole and repeat. 

 

 Below is the sequence for each final size.

 

 Hole for AN5 (5/16"): 1/8", 13/64", 1/4", then N.

 

 Hole for AN6 (3/8"): 1/8", 13/64", 1/4", N, then U.

 

 Hole for AN6 (3/8"), no reamer: 1/8", 3/64", 1/4", N

 then 3/8"

 

 Note that the material was clamped to the drill

 press table all the time. I did have to lower the

 table one or two inches in order to mount the

 reamers. This is the only thing I can think could

 have thrown the process off track.

 

 One more question: to avoid the adjustment step, I

 could cut the reamer's shank. Does anyone see

 a problem with this?

 

 

 

 Thanks in advance for your toughts / comments /

 blank stares.

 

 

 Carlos

 CH601-HD, plans

 working on a concept of infinity applied to time.

 

 

 	

 

 	

 		

 Lche-vitrine ou lche-cran ?

 magasinage.yahoo.ca

 

 

 



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cgalley(at)qcbc.org
Guest

Posted: Mon Apr 24, 2006 7:29 pm Post subject: holes, drill bits, reamers and bolts

If you have a standard chucking reamer of a nominal size, an AN bolt is 

always a couple of thousands smaller.  You can get precision ground aircraft 

bolts.  If you can find them as surplus they are reasonable.



Cy Galley - Chair,

AirVenture Emergency Aircraft Repair

A Service Project of Chapter 75

EAA Safety Programs Editor - TC

EAA Sport Pilot

---

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grs-pms(at)comcast.net
Guest

Posted: Mon Apr 24, 2006 8:44 pm Post subject: holes, drill bits, reamers and bolts

Carlos:



For a 3/8 diameter AN6 bolt, the max diameter is .374 and the min is only

.371.  Perhaps you can select AN6 bolts that run toward the maximum

diameter.  The corresponding close tolerance bolt, AN 176, has a max

diameter slightly greater at .3742 and the minimum is .3737.  For a 5/16 AN5

bolt you could substitute the close tolerance AN175.  Again the minimum

diameter is larger for the close tolerance bolt.  Bolt strength is

equivalent in each case.



George

---

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flybumtoo

Joined: 09 Jan 2006
Posts: 7

Posted: Mon Apr 24, 2006 8:44 pm Post subject: holes, drill bits, reamers and bolts

Check out this article.  It really helped me out - especially the last 3 

paragraphs.

http://www3.sympatico.ca/fhofmann/art_round_hole.html



I found this helpful too.

http://exp-aircraft.com/library/alexande/hardware.html



- Dan



[quote] ---

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n801bh(at)netzero.com
Guest

Posted: Mon Apr 24, 2006 11:20 pm Post subject: holes, drill bits, reamers and bolts

The easiest way to is mic the bolts, get an avaerage size of the shank , then order a reamer that size. MSC, Mc Master and other tool houses sell all sizes of reamers in .001 increments at very reasonable prices. For instance, you have bolts that measure .373, round up the amount that size needed for the job and order a .372 reamer for 8 bucks or so.

 

do not archive 

Ben Haas

N801BH

www.haaspowerair.com



-- "Dan Ribb" <dan(at)danribb.com> wrote:




Check out this article.  It really helped me out - especially the last 3 

paragraphs.

http://www3.sympatico.ca/fhofmann/art_round_hole.html



I found this helpful too.

http://exp-aircraft.com/library/alexande/hardware.html



- Dan



[quote] ---

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Tue Apr 25, 2006 4:18 am Post subject: Re: holes, drill bits, reamers and bolts

Hi Carlos

Depending on the setup and the tool, you may sometimes get a hole bigger than the drill. However, that does not matter as long as the hole is still smaller than the reamer that you are about to put in it. Check the hole size after the drill is done. If it is O.K. put the reamer through. Always run your reamers a lot slower than your drill (rpm). If the reamer cuts,  the hole WILL be the same diameter as the reamer. 

Your chuck may not be running true. You should have a clamp on the part for safety. I suggest you do not cut the reamer down. The extra length allows the reamer to flex and follow the drilled hole. A shorter reamer is stronger and if there is runout it will tend to cut oversize like it was a boring bar. Hope this helps..........Geoff.

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