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View Full Version : Any recommendation for a filter for flood coolant?



cfranks
03-08-2019, 06:39 AM
I'm about to install a small flood coolant system to my Churchill NB surface grinder and want to use a filter bag to try and clean the recovered water soluble oil coolant . McMaster-Carr have lots and the choice is based on the grain size. What sort of grain size might a hobby machinist expect? I doubt if if I would ever grind ultra fine surfaces.

Charles

3 Phase Lightbulb
03-08-2019, 08:04 AM
I'm about to install a small flood coolant system to my Churchill NB surface grinder and want to use a filter bag to try and clean the recovered water soluble oil coolant . McMaster-Carr have lots and the choice is based on the grain size. What sort of grain size might a hobby machinist expect? I doubt if if I would ever grind ultra fine surfaces.

Charles

I bought one of these filters that I'm going to use to filter the coolant run-off on my surface grinder. My surface grinder has a SCH40(ish) drain pipe built into the table and I'm planning on running the coolant into a recovery pail with one of these filters separating the incoming coolant. I'll probably attach the filter sock to a lid and run a drain hose from the surface grinder to the pail and into the sock.

https://www.amazon.com/gp/product/B0067GPSP8/ref=oh_aui_search_asin_title?ie=UTF8&psc=1

https://images-na.ssl-images-amazon.com/images/I/61sMmcOOO0L._SL1500_.jpg

Bob La Londe
03-08-2019, 09:52 AM
Remember to make cleaning the filter part of your routine.

old mart
03-08-2019, 10:27 AM
A strong cylindrical magnet in a non ferrous tube with a closed end would be useful. Remove the assembly for cleaning and withdraw the magnet to make wiping off the magnetic mud easy. It needs to be outside the filter next to the unfiltered inlet.

dalee100
03-08-2019, 10:36 AM
Hi,

Yep, magnetic skimmers and settling tank are how it's done on commercial systems. A filter will be clogged and rendered useless very quickly.