Air tool underpowered?

discharge only 4bar with running tool in compressor rated at 8bar.


hello i have verticall sander with running at max 7 bar and i got air compressor 100l 14.6cfm 3hp 8bar dicharge. probkem starts when i run the sander all regulators are open fully and show only 4 bar dicharge with is not enough to run sander propoly can you help guys? compressor is brand new 30meters airline connected with water trap and lubricant

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Jul 07, 2017
Thanks!
by: Anonymous

Thanks for help.

Jul 06, 2017
Speaking of pressure drop...
by: Doug in s.d.ca.

This thing has a 1/2 inch inlet.

So, once you get a bigger compressor, or add one or two to get to the demand, you'll want to have at least 1/2 inch hose or whatever to it, if you don't already.

Jul 06, 2017
air for grinder
by: Doug in s.d.ca.

https://www.atlascopco.com/content/dam/atlas-copco/industrial-technique/products/grinders/general-documents/W_Grinders.pdf/subassets/page16.pdf

says it's 15CFM at no load. 51 at max output.

That really is l/s (second) so you need x60 to get minutes.

Jul 06, 2017
cfm
by: Anonymous

i convert l/s to cfm and thats the problem.. 10l/s its 21cfm so i need compressor that can give me 21-50cfm

Jul 06, 2017
27 l / min
by: Bill

If the conversion page I found is correct, that translates to 1 CFM.

Your compressor can deliver 14.6 CFM at 8 bar, so it should be able to provide lots of air for this sander.

The things that could affect this are:

1) Regulator problem

2) Pressure drop over a longer run. Please see this page and let us know if you feel that pressure drop could be the issue:

http://www.about-air-compressors.com/estimating-pressure-drop.html

Jul 05, 2017
sander air consumption
by: Anonymous

air consumption at max output 27 l/s
air consumption at free speed 10 l/s

Jul 05, 2017
pressure
by: Anonymous

thats the problem it doesn't say anywhere all its say its on compressor website

http://www.sgs-engineering.com/air-compressors/sc100v-100-litre-high-flow-air-compressor

and air tool instruction saying its designed for a working pressure of 6-7bar=600-700kpa=87-102psig
and its can not exceed 7bar=700kpa=102psig

https://www.atlascopco.com/en-uk/itba/products/Material-removal-tools/Sanders/vertical-sander

Jul 05, 2017
What CFM?
by: Bill

You have advised that the compressor delivers 14.6 CFM at 8 bar.

Also that the sander runs at 7 bar, but what is the CFM requirement of the sander, please?

Add a comment here with that info if you would.

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