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  #1  
Old 06-08-2015, 01:08 PM
spencers93's Avatar
spencers93 spencers93 is offline
 
Join Date: Aug 2009
Location: St. Louis MO
Posts: 18
Default Grinder vs Buffer

Hi all,

I am putting together my tool lists for an RV-14 build. I have a question regarding the need for a "grinder". I know Cleveland Tools sells the Baldor 111 buffer and from what I've read this seems to be an excellent machine that would work ideally for the edge duburring that it is needed. Is there a need during the RV-14 build for an actual "grinder". This question would be from someone who doesn't plan to make a lot of modifications.

Thank you,

David
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  #2  
Old 06-08-2015, 01:22 PM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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Default

I know some will see this as a sacrilege, but I have an inexpensive Harbor Freight bench buffer/polisher that works just fine. I have a Scotchbrite wheel on one side, and really that's all I use for the plane. I have a bench grinder with a buffing wheel and grinding wheel but haven't needed it since starting my RV-7 build.

I would have liked to just have the one, but the shrouds that enclose about 3/4 of the wheel circumference on my ancient Crafstman grinder are non-removable. I couldn't use the SB wheel to debur the edges of longer pieces. You kind of need most or all of the wheel exposed.
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  #3  
Old 06-08-2015, 01:25 PM
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DanH DanH is offline
 
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Location: 08A
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A stationary motor equipped with a Scotchbrite wheel is a highly desirable tool for sheet metal work.

You want it to be (1) floor mounted on a pedestal stand, (2) with the wheel on a long shaft. A bench mounted motor, with the wheel tucked in in close to the motor case, is kinda useless because there is no room to maneuver the sheet metal.

A lot of us use an ordinary electric motor with a shaft arbor. Here's an example of a long arbor:

http://www.globalindustrial.com/p/pn...-fits-58-shaft
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  #4  
Old 06-08-2015, 01:26 PM
Mike H Mike H is offline
 
Join Date: May 2014
Location: Savannah
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As an aircraft mechanic for over twenty years, I have never used a bench grinder to debur, or fabricate any aircraft structutral parts. A 90 degree die grinder will do everthing the bench grinder will do, and do it better, faster, with more precision....etcetera. 3M Roloc scothbrite and sanding discs are you're friend!

http://www.homedepot.com/p/Husky-1-4...230C/204671969
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A&P IA PPL ASEL
RV-14A kit S/N 140170
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  #5  
Old 06-08-2015, 01:31 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Bench grinder

Which ever you get, make sure the motor is smaller diameter than the wheel.
I have a Ryobi. The guards are removed. 7a scotchbrite in one side and buffing wheel on the other. Only takes one hit to figure out why there's a buffing wheel on the other side.
I use a vixen file for skins. The scotch brite wheel is handy for smaller stuff.
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http://wirejockrv7a.blogspot.com
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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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  #6  
Old 06-08-2015, 02:04 PM
David Paule David Paule is offline
 
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Location: Boulder, CO
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I don't have a grinder or a Scotchbrite wheel (except for the tiny one on a die grinder) and see no need for them.

I use files and sometimes sandpaper. These work very well with minimal particles in the air.

Dave
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  #7  
Old 06-08-2015, 02:36 PM
JDBoston JDBoston is offline
 
Join Date: Oct 2007
Location: Boston Area
Posts: 284
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Quote:
Originally Posted by Mike H View Post
As an aircraft mechanic for over twenty years, I have never used a bench grinder to debur, or fabricate any aircraft structutral parts. A 90 degree die grinder will do everthing the bench grinder will do, and do it better, faster, with more precision....etcetera. 3M Roloc scothbrite and sanding discs are you're friend!

http://www.homedepot.com/p/Husky-1-4...230C/204671969
Mike,
I have the blue roloc Scotchbrite discs and for the life of me have trouble figuring out what they are good for. They seem to wear down to nothing very quickly. What do you use the discs for? Edge deburring??

I also have a HF cheap bench grinder which is useful but generally use the Scotchbrite 2" or 1" disc in a die grinder. My smaller compressor runs constantly though when using it.
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  #8  
Old 06-08-2015, 02:38 PM
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Vern Vern is offline
 
Join Date: Jan 2005
Location: Peachtree City, Ga
Posts: 1,040
Thumbs up Buffer for Scotchbrite wheels, etc

I've been an A&P since about 1975 and I use my buffer almost every time I'm in the hangar.

Harbor Freight has two that are cheap and suitable for bench mount:
Search for their models 61557 or 94393. Both are on sale for $39 now.

The angle die grinder is also a must-have for step drills, grinding, 3" cutting wheels, and burrs. In fact, you probably would enjoy having 2-3 cheap ones like the Husky's from Home Depot so you don't have to waste your time changing appliances. That's also true for air drill motors as well. Keep a #30 in one and a #40 in the other. Saves time.
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  #9  
Old 06-08-2015, 02:42 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Step drills

Quote:
Originally Posted by Vern View Post
I've been an A&P since about 1975 and I use my buffer almost every time I'm in the hangar.

Harbor Freight has two that are cheap and suitable for bench mount:
Search for their models 61557 or 94393. Both are on sale for $39 now.

The angle die grinder is also a must-have for step drills, grinding, 3" cutting wheels, and burrs. In fact, you probably would enjoy having 2-3 cheap ones like the Husky's from Home Depot so you don't have to waste your time changing appliances. That's also true for air drill motors as well. Keep a #30 in one and a #40 in the other. Saves time.
What a great idea. Gotta try putting a step drill in the die grinder.
As for Harbor Fright, do an internet search for 20% off in store coupon. Keep your phone ready at checkout. Save, save, save.
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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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  #10  
Old 06-08-2015, 03:50 PM
12vaitor 12vaitor is offline
 
Join Date: Aug 2012
Location: Panama City, FL
Posts: 132
Default

I started out with a Scotchbrite wheel / bench grinder and soon found the 1" Scotchbrite wheel in a die grinder to be faster and a whole lot easier to use. I use a 3" blue Roloc Scotchbright disk to edge dress for punch flashing and rounding points, then the 1" wheel to polish and round edges. On thin material you need to keep a light touch, especially at the corners. I have a three die grinder set up; 3"Roloc (90 deg), 1.5"Roloc (90 deg) and 1" SB wheel (straight) so changing abrasives is quick. For lightening holes in ribs and other areas, you cannot beat the 1" wheel setup. For big parts like wing skins, the handheld tool is a lot easier to use.

Clevland Tool has the 1" Scotchbright in CP7AM and EXL2, I usually use the CP7AM. I used about a dozen building my RV-12.

John Salak
RV-12 #120116/H896HS
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