Thread: Ask the right question, sometimes get more than ask

I've played around with those sorts of blower.

Two problems with the ones I played with were;
The impeller blades - there are too many and they can choke with shavings.
The other is they are very noisy.
The outlet is also quite small so the flow rate was not that inspiring.

What RPM is the motor?

So bobL please enlighten me how the shavings are going to block "MY" impeller, as would know I have a two cyclones. a small one for hand power tools and a large one for saw bench, band saw, lathe and for the router bench. thus goes in this order "dirty side - cyclone - filter- clean side - blower.

Originally Posted by Opelblues2

So bobL please enlighten me how the shavings are going to block "MY" impeller, as would know I have a two cyclones. a small one for hand power tools and a large one for saw bench, band saw, lathe and for the router bench. thus goes in this order "dirty side - cyclone - filter- clean side - blower.

Then you won't have a blockage problem.
The small outlet of the blower means you will probably still have a flow issue.
Whats the RPM of the motor?

the green unit came out of a CNC panel router line, it was pulling from the cutter head, up 1.5mt/120mm flex, then down 6mt of 180mm duct through a cyclone, filter, Blower in to a secondary filter then out of the shed. what I saw before they stated to pull everything a part, it was enough for me to ask if I could have them, the aluminum unit was being used in the table as down draft to hold the sheet in place while being machined.

I maybe understanding this wrong, the thing that was explained to me that there has to be some sort of a restriction in the outlet of the blower to assist in preventing flow over in the vortex of the impeller, like when you have large HP motor in a boat driving a prop that is too small and it causes Cavitation or the other direction where the impeller is to large for the captive flow thus creating the opposing cavitation. this is what I understand.

all I need to know that it will "suck" for my purpose
Electric Motor - 2850rpm

Originally Posted by Opelblues2

. . . . , the aluminum unit was being used in the table as down draft to hold the sheet in place while being machined.

This means it will be a high pressure low flow setup - that explains the small intake and outlet because it is not intended to have any air flow.

I maybe understanding this wrong, the thing that was explained to me that there has to be some sort of a restriction in the outlet of the blower to assist in preventing flow over in the vortex of the impeller, like when you have large HP motor in a boat driving a prop that is too small and it causes Cavitation or the other direction where the impeller is to large for the captive flow thus creating the opposing cavitation. this is what I understand.

all I need to know that it will "suck" for my purpose
Electric Motor - 2850rpm

The outlet on the green one still only looks like about 4" which means it won't have much volume flow i.e. the restriction is the ducting. CNC used high pressure low flow systems like a big vacuum cleaner because they create dust from virtually a point source. Could be good for router duct collection - won;t work so well on table or band saw.