Shopsmith Forums

I noticed the dust where it shouldn't have been in the video as well! I would probably use a series of filters. Furnace filters on the outside to catch the bigger particles and a 1 micron or .5 micron just before the blower chamber. Maybe another layer between. I don't know, it's just very early conceptual plans in my head right now.

One tip , when you are done and think you have it right,,, check the amps on the motor while it is running, if they are too high you may have to cut back ob the filters micron, also a airflow gage will help you determine when to change the filters .

heathicus wrote:I noticed the dust where it shouldn't have been in the video as well! I would probably use a series of filters. Furnace filters on the outside to catch the bigger particles and a 1 micron or .5 micron just before the blower chamber. Maybe another layer between. I don't know, it's just very early conceptual plans in my head right now.

His design is nice but with the filters he is using it is useless. I would not even say it is better than nothing.

The dust stays suspended in the air for a period of time after it is created. The very heaviest particles fall fairly quickly but the small particles (the most dangerous ones to us) stay suspended and rise due to convection created by the warm air in the shop. That is why ceiling mounted air filters are more efficient.

I have my two ceiling mounted air filters mounted in opposite directions. That way the exhaust of one is on the intake side of the other. Hopefully that creates a circular air flow at the ceiling. I have no idea if at the end of the day it makes much difference but it certainly can't make things worse.

Hobbyman2 wrote:One tip , when you are done and think you have it right,,, check the amps on the motor while it is running, if they are too high you may have to cut back ob the filters micron, also a airflow gage will help you determine when to change the filters .

Why?

The load on the motor is due to the air flow, the amount of air the blower is pulling. Block the air intake of a vacuum or any other air sucker. The noise gets louder. That is because the motor speeds up. Why? Because you have removed the load on the motor. No air going through the blower (the load) so the motor speeds up.

I know, nobody thinks of it that way for what ever reason but that is the way it is.

That is why more surface area of a filter means more air flow through the blower. That equates to a higher load on the motor.

One of the other things that nobody ever thinks about (really no reason to) is that the North Pole is magnetically north polarity. -WRONG- The North Pole is actually South magnetic polarity. Go Google it. You will find that the north pointing end of a compass needle is actually north polarity. That means that it is attracted to the opposite polarity, south.

https://en.wikipedia.org/wiki/North_Magnetic_Pole

Good point, I have seen where the increase in motor noise slowly increased over time and wasnt noticed , even with a air gage some folks dont look at them.

Just flashing back when we used belts on blower housings ,,sort of giving way my age here,,,,, most drive pulleys were adjustable , seen one or two motors ruined pretty fast because the load wasnt checked .

Hobbyman2 wrote:Good point, I have seen where the increase in motor noise slowly increased over time and wasnt noticed , even with a air gage some folks dont look at them.

Just flashing back when we used belts on blower housings ,,sort of giving way my age here,,,,, most drive pulleys were adjustable , seen one or two motors ruined pretty fast because the load wasnt checked .

Methinks the motor 'size' was the culprit(too small).

jsburger wrote:

Hobbyman2 wrote:One tip , when you are done and think you have it right,,, check the amps on the motor while it is running, if they are too high you may have to cut back ob the filters micron, also a airflow gage will help you determine when to change the filters .

Why?

The load on the motor is due to the air flow, the amount of air the blower is pulling. Block the air intake of a vacuum or any other air sucker. The noise gets louder. That is because the motor speeds up. Why? Because you have removed the load on the motor. No air going through the blower (the load) so the motor speeds up.

I know, nobody thinks of it that way for what ever reason but that is the way it is.

That is why more surface area of a filter means more air flow through the blower. That equates to a higher load on the motor.

One of the other things that nobody ever thinks about (really no reason to) is that the North Pole is magnetically north polarity. -WRONG- The North Pole is actually South magnetic polarity. Go Google it. You will find that the north pointing end of a compass needle is actually north polarity. That means that it is attracted to the opposite polarity, south.

https://en.wikipedia.org/wiki/North_Magnetic_Pole

John, the reason those motors speed up, when
the intake is blocked, stall. The impeller's
blades look (and work) like a wing. Too steep
a climb, (or less air) and the wing stalls.

Oh, liked the logic with the North Pole!

steve

skou wrote:

jsburger wrote:

Hobbyman2 wrote:One tip , when you are done and think you have it right,,, check the amps on the motor while it is running, if they are too high you may have to cut back ob the filters micron, also a airflow gage will help you determine when to change the filters .

Why?

The load on the motor is due to the air flow, the amount of air the blower is pulling. Block the air intake of a vacuum or any other air sucker. The noise gets louder. That is because the motor speeds up. Why? Because you have removed the load on the motor. No air going through the blower (the load) so the motor speeds up.

I know, nobody thinks of it that way for what ever reason but that is the way it is.

That is why more surface area of a filter means more air flow through the blower. That equates to a higher load on the motor.

One of the other things that nobody ever thinks about (really no reason to) is that the North Pole is magnetically north polarity. -WRONG- The North Pole is actually South magnetic polarity. Go Google it. You will find that the north pointing end of a compass needle is actually north polarity. That means that it is attracted to the opposite polarity, south.

https://en.wikipedia.org/wiki/North_Magnetic_Pole

John, the reason those motors speed up, when
the intake is blocked, stall. The impeller's
blades look (and work) like a wing. Too steep
a climb, (or less air) and the wing stalls.

Oh, liked the logic with the North Pole!

steve

OK, I guess that is a different way of explaining it that is even more confusing to the layman. That is what I said, no air, no load on the motor. Regardless, the point I was trying to make was that Hobbyman2 seemed to indicate that higher micron filters put a higher load on the motor. Not true.

That should be lower micron filters. As in 1 micron as opposed to 5 micron.

jsburger, you've got me thinking. I don't have the head room to mount an air cleaner on the ceiling, but I wonder if I could mount it outside of the building. Mount it on an exterior wall, cut a vent in the wall for the air intake, go through the purifier, then output back into the shop through another vent. I'm thinking...

heathicus wrote:jsburger, you've got me thinking. I don't have the head room to mount an air cleaner on the ceiling, but I wonder if I could mount it outside of the building. Mount it on an exterior wall, cut a vent in the wall for the air intake, go through the purifier, then output back into the shop through another vent. I'm thinking...

Heath, I have the Jet unit, and it works well. I ceiling-mounted mine, but that’s just one of many options. You can mount it in any orientation, on any surface, or just set it on top of something. The ony requirement is that the airflow is not blocked (at the long ends of the unit).