Tools & Fabrication - Newbe at using air grinder



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Jimmy P
05-07-2011, 03:47 AM
I normally use my dremel for light porting work, but decided to buy a disposable air grinder. I ended up with a $25 Kawaski grinder. I hooked it up to my 25 gallon compressor. The grinder needs at least 90psi per the manual. I think my compressors regulator is set to around 95psi or so.
Initial thoughts is that it doesn't feel very variable. Its more like an On/Off switch(almost). I need to really focus not too press too hard or it goes full speed. Is that because I bought such a cheap air grinder? Anyway to slow it down?

studderin
05-07-2011, 12:14 PM
humm even the cheap grinders I have a variable?

thats a small compressor for porting, but what every you were doing with a dremal wasnt much anyway
garygnu
05-07-2011, 11:03 PM
up the regulator setting to 100 PSI or get a bigger compressor .

67RSCamaroVette
05-31-2011, 03:26 PM
All of the die grinders are touchy, you have to get a feel for it. After several hours of using it, you'll be a natural. I use solely Harbor Freight ones.. my Snap-On die grinder stays in the box for the most part.
Silverback
05-31-2011, 08:42 PM
Funny, I like my HF ones better than my IR ones...
kevindglenn
06-05-2011, 11:13 AM
You'll definitely want to test it out/practice with it on a piece of scrap before you get to the real project.
Doug G
06-12-2011, 06:28 AM
Use a needle valve at the tool to adjust pressure ;)

http://www.amazon.com/Parker-MFP-309-Brass-Control-Needle/dp/B002SR7S5I
Beebe
06-12-2011, 10:09 AM
I hate air grinders for consistancy..............too much up and down rpm / speed
Silverback
06-12-2011, 12:57 PM
most that use them for porting set a maximum pressure on the air line and then pulse them when running the cutter, if you run them at a constant high rpm they just melt the aluminum and clog up...
3YLSYKR
06-12-2011, 12:59 PM
Careful with it, lots of power haha.
67RSCamaroVette
06-26-2011, 11:58 PM
most that use them for porting set a maximum pressure on the air line and then pulse them when running the cutter, if you run them at a constant high rpm they just melt the aluminum and clog up...

A bar of soap or wax nearby, and a cup of muriatic acid are a carbide's best friends. Wax keeps the buildup out, muriatic acid eats the aluminum off the blades like a fat kid sucking butter off corn, and the carbide could care less. :D