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General control line discussion => Open Forum => Topic started by: Bootlegger on June 04, 2008, 04:58:24 AM

Title: Alum Pads
Post by: Bootlegger on June 04, 2008, 04:58:24 AM

 :!  Mornin Guy's I am looking for some 6061 alum pads 3/16" thick by 3/8" wide.
  I am gonna drill and tap them to 4-40 threads so that I can change engines on my models.
  Any help sure would be appreciated,

Title: Re: Alum Pads
Post by: Bill Gruby on June 04, 2008, 05:17:48 AM

 Gil;

  Go to any hardware store or Home Depot etc., they sell what you are looking for in 4 to 6 foot lengths. It is not expensive and one 4 foot length makes a lot of pads.

  "Billy G"  H^^

  If you cannot locate what you need, let me know and I will send you some 6061-T6 for your needs.

Title: Re: Alum Pads
Post by: Jim Oliver on June 04, 2008, 06:35:17 AM

I bought some of the aluminum from the hardware store---OK for pads, but it seems fairly soft to be 6061.

Check with your buddy at the local airport for scraps of actual aircraft aluminum---my buddy lets me pick out what I need from his scrap box.


Cheers,
Jim

Title: Re: Alum Pads
Post by: Bob Reeves on June 04, 2008, 07:16:37 AM

I use the hardware store 1/8 inch but instead of taping the aluminum I use counter sunk 4-40 screws from the back and use lock nuts on the engine lugs. Works fine and don't need to track down harder aluminum. You can cut it with just about any saw you use to cut wood. I use my band saw to cut strips 3/8 inch wide from 2 inch stock.

Title: Re: Alum Pads
Post by: SteveMoon on June 04, 2008, 07:25:40 AM

Bootlegger: We have exactly what you are looking for at Ultra
Hobby Products. I've been mounting my engines this way
for 15 years. We sell the pads for $4.00/pair.
www.ultrahobbyproducts.com

Thanks, Steve

Title: Re: Alum Pads
Post by: Mike Spiess on June 04, 2008, 11:17:38 AM

Steve love the new web site #^ y1

Title: Re: Alum Pads
Post by: SteveMoon on June 04, 2008, 11:25:01 AM

Thanks Mike!

Title: Re: Alum Pads
Post by: Pinecone on June 05, 2008, 09:52:36 AM

I normally order my Al liket his from Aircraft Spruce, www.aircraftspruce.com

I would think that 2024 would be better for this application.

Title: Re: Alum Pads
Post by: Randy Cuberly on June 05, 2008, 11:45:05 AM

Quote from: Pinecone on June 05, 2008, 09:52:36 AM

I normally order my Al liket his from Aircraft Spruce, www.aircraftspruce.com

I would think that 2024 would be better for this application.

I agree...
2024 is approximately 25% higher in tensile strength and would be better for this application but sometimes is not as easy to find in all sizes as 6061 which would be OK.
The aluminum typically carried by common Hardware stores is construction grade 1100 series and while it's very corrosion resistant it's not very strong.  Tapped holes in 1100 wouldn't take much load.

Randy Cuberly

Title: Re: Alum Pads
Post by: john e. holliday on June 08, 2008, 07:38:50 AM

So far myself I have not had the 4-40 threads strip out on my ACE Hardware aluminum.  DOC Holliday

Title: Re: Alum Pads
Post by: don Burke on June 08, 2008, 11:53:20 AM

Did a search of material properties.

1100 alum runs 15-24,000 psi tensile yield strength
6000 alum 16-36000 tensile

Marginally better depending on temper.

The hardware store stuff is adequate but so much easier to find than 2024 or 7075!  When mounting an engine I use at least 3/16 thick to get good thread engagement. 

Title: Re: Alum Pads
Post by: Pinecone on June 08, 2008, 08:07:33 PM

2024 is in the 40,000 - 60,000 range. :)

Not hard to find, just order from Aircraft Spruce or Online Metals.

3/16" x 1/2" is $7.10 per foot from Aircraft Spruce.

Title: Re: Alum Pads
Post by: Jim Kraft on June 09, 2008, 08:04:59 AM

I use 1/8" steel on most of mine. I generally need the nose weight anyway.

Title: Re: Alum Pads
Post by: Bill Gruby on June 09, 2008, 08:09:13 AM

 Bootlegger;

  Watch your mail  6064 on its way.

  "Billy G"  H^^

Title: Re: Alum Pads
Post by: Mike Spiess on June 09, 2008, 08:46:03 AM

Quote from: Jim Kraft on June 09, 2008, 08:04:59 AM

I use 1/8" steel on most of mine. I generally need the nose weight anyway.

I seem to be in that same catagory. n~

Title: Re: Alum Pads
Post by: Bootlegger on June 09, 2008, 03:19:43 PM

     Thank You "G" man. Sure did njoy th conversation wit  ya'.
  Lookin 4 ward 2 th' goody's... :##