3m wheels

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3m wheels

Postby pchuckie » Tue May 03, 2016 8:58 pm

Which 3m wheel for a grinder to debur?
I bought a medium but it seems to leave it's own marks, they are finer than saw teeth marks though. Maybe I'm performing the operation wrong, just started the rudder control horn on the tail kit.
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Re: 3m wheels

Postby rk2436 » Tue May 03, 2016 9:59 pm

You still need to file or sand the deep cut marks and then finish up on the scotchbright wheel.
Bob K
Orig builder kit 1143
Now flying RV-12
Evergreen Park,Il
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Re: 3m wheels

Postby gammaxy » Tue May 03, 2016 10:09 pm

I used a 7A medium (Wicks F3753) which is the same one Sonex calls for on the tool list:
http://www.sonexaircraft.com/kits/tools.html

The rule-of-thumb seems to be to make sure the part is smooth enough you can't snag a fingernail on it. I'd need more detail to determine whether "leave it's own marks" is a problem or not. The surface definitely won't be a mirror-finish afterwards, but it will be pretty smooth.

Here's the exact link to where I bought it from 5 years ago:
http://aircraftproducts.wicksaircraft.c ... heel/f3753?
Chris Madsen
Aerovee Sonex N256CM
Flying since September 2014
Build log: http://chrismadsen.org
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Re: 3m wheels

Postby Bryan Cotton » Tue May 03, 2016 10:56 pm

I bought mine from Van's years ago.
https://www.vansaircraft.com/cgi-bin/st ... ct=s-wheel
I assume that is the same one. For thick parts like rudder horns I use the side of the wheel. For thin parts they will cut a groove in the wheel which does a nice job on the edge.
Bryan Cotton
Poplar Grove, IL C77
Waiex 191 N191YX
Taildragger, Aerovee, acro ailerons
dual sticks with sport trainer controls
Prebuilt spars and machined angle kit
Year 2 flying and approaching 200 hours December 23
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Re: 3m wheels

Postby pfhoeycfi » Tue Feb 27, 2018 9:25 am

I purchased the F3753 3M Scotch Brite wheel from Wicks...the one on the Sonex tool list. The center mounting hole dia is very small... much too small for my bench-top grinder/polisher. Has anybody tried making this hole larger?

peter
Peter Hoey
SEL Pvt, Comm Glider, CFIG, Pawnee & L19 Towpilot
Philadelphia Glider Council
Sonex B SNB0021, N561PH, Taildragger, Aerovee Turbo, MGL MX1, First flight Dec 18, 2022
Also built Sonerai IIL N86PH
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Re: 3m wheels

Postby samiam » Tue Feb 27, 2018 12:48 pm

You are likely using the correct wheel, but the piece needs more finishing before it's ready for it.

The thicker aluminum pieces have some significant ridges on the side of them that really require cleaning with a vixen file and sanding before they are ready for the wheel.

Posting some pictures of your pieces in question would be helpful as well.

Hope you are having fun!
Mike L
Sonex #1345
Tail complete
Working on wings
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Re: 3m wheels

Postby Bryan Cotton » Tue Feb 27, 2018 6:29 pm

Mike, I think Peter is saying he can't mount his wheel because the hole is too small. Peter, I've seen the opposite where bushings were used to make the wheel fit. Sounds like a great opportunity to get a second grinder, so you can have two stone wheels, one scotch brite wheel, and one wire wheel.
Bryan Cotton
Poplar Grove, IL C77
Waiex 191 N191YX
Taildragger, Aerovee, acro ailerons
dual sticks with sport trainer controls
Prebuilt spars and machined angle kit
Year 2 flying and approaching 200 hours December 23
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Re: 3m wheels

Postby pfhoeycfi » Tue Feb 27, 2018 7:47 pm

Yes my thoughts too.
Peter
Peter Hoey
SEL Pvt, Comm Glider, CFIG, Pawnee & L19 Towpilot
Philadelphia Glider Council
Sonex B SNB0021, N561PH, Taildragger, Aerovee Turbo, MGL MX1, First flight Dec 18, 2022
Also built Sonerai IIL N86PH
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Re: 3m wheels

Postby Rynoth » Wed Feb 28, 2018 12:48 pm

This is what I used: http://www.aircraftspruce.com/catalog/t ... gInz_D_BwE

I'm referring to the 7S "fine" wheel. They have 1/2" and 1" hole sizes. It polishes aluminum into butter, love that wheel. It easily lasted the life of my project and could probably do a 2nd Sonex.

I was never a fan of the vixen file method, virtually all my edges were deburred with a coarse 3M wheel and/or belt sander, then finished with the wheel I linked above.
Ryan Roth
N197RR - Waiex #197 (Turbo Aerovee Taildragger)
Knoxville, TN (Hangar at KRKW)
My project blog: http://www.rynoth.com/wordpress/waiex/
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Re: 3m wheels

Postby mbond » Thu Dec 27, 2018 7:39 pm

came looking for this exact thread.

I need to do the finishing work on the tail spar before continuing. I bought the wheel mentioned on sonex's tool page, but it doesn't seem like the tool to start with.

what type of sanding needs to be done? is there a video showing the proper way to do the sanding? is it the same as sanding wood?

I've found videos on using vixen files.

Are there any videos on using the scotch brite wheel on the hockey stick?

thanks.
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