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11-27-2014, 04:28 PM
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Join Date: Oct 2013
Location: Sydney
Posts: 185
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Deburring
Quick question to you all.
I'm wanting to debur selected parts using a commercial linishing machine. I'm having made custom silicon carbide belts but need advice on which grit to use. I'm considering using 400 grit. Any recommendations?
Thanks in advance!
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RV7 SB Tip Up -200HP -CS- Inverted
Inventoried - ready to build - for RTW
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11-27-2014, 04:35 PM
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Join Date: Dec 2005
Location: Oliver, B.C. Canada (Okanagan valley)
Posts: 786
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If you're thinking of the edges, then something like 320 or so would do. (think 400 is fine too) We don't want to remove material here, just enough to smooth the edges. Something a file and a 3M maroon pad can do well. Although, I will admit that I do use my 3M Scotchbrite wheel a lot.
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Lorne
RV 7a tip-up
Pre-cover MD-RA Inspected.
Canopy completed. Bonded with Sika-Flex.
Up on her mains, Firewall Fwd and wiring on going.
Last edited by lorne green : 11-27-2014 at 06:39 PM.
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11-28-2014, 09:12 PM
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Join Date: Jan 2012
Location: Friendswood, TX
Posts: 193
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Why all the trouble? Just get a scotchbrite wheel!
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RV-7 Flying Since March 2015
N412HC
Titan IOX-370
SDS Tunable Injectors
EFII Dual Ignition and Fuel Injection
Garmin G3X Touch
Whirl Wind 200RV Prop
7XS0 Polly Ranch Airpark, Friendswood, TX
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11-29-2014, 10:50 AM
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Join Date: Jan 2011
Location: Cumming, Georgia
Posts: 873
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Amen on the scotchbrite wheel...
Jack
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Smilin' Jack & Anita Hunt
N507H RV7, KJZP Jasper, GA
EAA690
APRS/ WB4JKY
Retired Corporate Pilot CFI-AI, MEL
CE500, LRJT, HS25, C650, SBJT, CL60
Hunt Aviation, LLC.
Pilot Service, IPC's Biennials.
Comm Glider
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11-29-2014, 11:03 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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Vixen file
Quote:
Originally Posted by carrollcw
Why all the trouble? Just get a scotchbrite wheel!
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+1 on the scotch brite wheel but I actually prefer a vixen file for straight edges like skins. I just have the hebbee jeebees about an edge catching on my wheel. 
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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12-03-2014, 02:45 PM
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Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 483
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Break it down first
I like to use a flat file and break the edges first afterwhich I use my Scothwheel in my Drill press. Really nice to get edges smooth especially at the rudder brake pedals where clothes can get snagged and torn.
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Dave Cobb
[color="Red"]=VAF=2019 Donation - and a bit extra for great work![/COLOR="blue"]
Empennage RV 7 - Tipper
Wings complete
Dynon installed and running
Fuse closer to completion, Canopy complete
AME reviewed and repaired O-320-Lyc installed
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12-03-2014, 07:43 PM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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To answer the OP's question,
If I had a Burr King or similar industrial finishing machine, I would set it up with the scotch bright or similar polishing belts. If you set it up with 400 grit I would be very careful and insure not to dwell on any edge. You are passing a lot of aggregate past the piece in a hurry.
Prior to polishing edges, I take a vixen file perpendicular to the sheet and knock down the tooling marks. On thicker sheet, I will make a pass on the edge as well.
I would love to own a Burr King. It will not help you with the big sheets like wing skins however unless you have a helper.
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Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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12-03-2014, 08:51 PM
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Join Date: Mar 2005
Posts: 97
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+1 on the scotchbrite belt. I use this far more than the wheel now, better control and more even results.
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John Keen
RV-7 complete in Phase 1
Gold Coast, Australia
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