LumberJocks

Dust Collector trash can level indicator.

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by b2rtch posted 03-08-2013 07:00 PM 1289 views 0 times favorited 26 replies Add to Favorites Watch
View b2rtch's profile

b2rtch

4341 posts in 1737 days


03-08-2013 07:00 PM

Topic tags/keywords: question

For the last few days I have been looking at different possibilities to make a dust level sensor in my DC trashcan.
I have been looking at many different systems and I found nothing really compelling.
All existing system seems to have a problem or the other.
I am now thinking about making my own system using one of the two following possibilities:
a Ultrasonic Level sensor or a Capacitive Proximity Sensor.
My main concern in using either one of these system ,is the swirling dust in the trash can.
I am concerned is that it will cause all kind of false alarms.
These sensors work very well in a relatively still and clean environment.
What will happen in the swirling dust?
I was told that they also are very sensitive to static electricity.
My Clear View, without a doubt, is the largest static electricity generator on my block, should I even try it?
Do you have any experience with these devices?
Do you think that my idea may work?
Thank you for reading and for any help.
Bertrand

-- Bert


26 replies so far

View Dallas's profile

Dallas

3047 posts in 1176 days


#1 posted 03-08-2013 07:43 PM

I was just noodling the same thing.
My thought was something on the order of a vacuum gauge, maybe a tube into the top of the collection bin open to ambient air.
A small ball inside the tube and an orifice on the outside end.

As the barrel fills, the suction at the inlet becomes stronger and the ball either unseats or rises higher in the tube.
another way is to use a device like a truck tell-tale for the air filter called a “Filter-Minder”.

-- Improvise.... Adapt...... Overcome!

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#2 posted 03-08-2013 07:50 PM

Dallas, I do not think that the vacuum in the trashcan varies as the bin fills up.
I do not think that your idea would work, sorry.
I also explored the idea of install the trash can on a digital scale and using the signal of the scale to trigger an alarm, but there too many variables for this to work

-- Bert

View bugz's profile

bugz

773 posts in 1353 days


#3 posted 03-08-2013 07:54 PM

My collector can on my Grizzly is very small, not sure if anything could work in such a small area. At work we have rotating sensors in are bins, when material gets up to them they quit rotating and give a light signal. On my grizzly, I can see collector and I put a rechargeable light behind my cyclone to dust bin hose, which is clear. I then can see if it is getting full. Any ideas for a easier way would be great.

-- Bob, Lewistown, Montana. Kindness is the Language the blind can see and deaf can hear. - Mark Twain

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#4 posted 03-08-2013 07:58 PM

At work we have rotating sensors in are bins, when material gets up to them they quit rotating and give a light signal.
I have read that these sensors work well in saw dust or other granular material but in the chips created by spiral heads on joiners or planers they do not work as they just keep rotating in the chips, defeating the purpose.

-- Bert

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#5 posted 03-08-2013 08:00 PM

Bob, if your trash can is in your shop,cut window in the side.
I did that before it worked great.
I used a 2 liters clear plastic bottle for “glass”.

-- Bert

View Dallas's profile

Dallas

3047 posts in 1176 days


#6 posted 03-08-2013 08:11 PM

Bert, maybe not, but… just thinking some more here.
Could use an N/O micro switch between two plates held up by 3-4 springs.
As the weight of the bin gets heavier, the springs collapse and the micro switch moves to closed position.

Adjustment could be made by stronger springs or bolts and washers.

-- Improvise.... Adapt...... Overcome!

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#7 posted 03-08-2013 08:17 PM

Dallas, there are too many variables for such a system or a scale to work.
Have trash can fill it full of wet saw dust and weight it.
Now take the same trash can, fill it with fluffy jointer chips and weigh it again. It probably is just fraction of the weight of the one filled with wet saw dust.
I have been thinking about this days and nights for the last two weeks and I am technician/engineer by trade.
I cannot find any good solution except for the proximity switch

-- Bert

View Bill Swartzwelder's profile

Bill Swartzwelder

174 posts in 601 days


#8 posted 03-08-2013 08:36 PM

Perhaps a small wind vane apparatus like the lawn and garden industry uses on commercial bagging systems. There is a little propeller on the inside of the lid that spins from the air currents inside the hopper. When the level of debris inside reaches whatever height you set vane at it cloggs the vane and the propeller stops spinning. You may have to experiment with locations, perhaps on the side of the can just offset from where the chips come into the can.

My first post here by the way.

Bill Swartzwelder

-- What if the Hokey Pokey really is what its all about?

View Dallas's profile

Dallas

3047 posts in 1176 days


#9 posted 03-08-2013 08:48 PM

Welcome Bill! I’ve seen those systems before too.

I was thinking along the lines of a sail switch in the airstream to the impeller.

somewhat like that used on an RV furnace except with an RV furnace when the blower comes on air movement closes the sail switch and allows the furnace to light.

In this case, as the volume of air decreased, the sail switch would open and light an LED or sound an alarm.

Yes Bert, I understand that you are a technician/engineer b trade. I apologize for interjecting any non-technically valid thought into the thread. I bow before your supreme knowledge and edgikatshun. I’ll go back to pickin’ my nose and playin’ in the hog waller know.

-- Improvise.... Adapt...... Overcome!

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#10 posted 03-08-2013 08:51 PM

Bill, be very welcome on Lumberjocks, the very best woodworking website anythwere,

-- Bert

View Bill Swartzwelder's profile

Bill Swartzwelder

174 posts in 601 days


#11 posted 03-08-2013 08:55 PM

something like this… I just scribbled it on a piece of paper. put it far enough from the top so you have time to notice that the indicator has stopped spinning well before the can is full.

-- What if the Hokey Pokey really is what its all about?

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#12 posted 03-08-2013 08:56 PM

Yes Bert, I understand that you are a technician/engineer b trade. I apologize for interjecting any non-technically valid thought into the thread. I bow before your supreme knowledge and edgikatshun. I’ll go back to pickin’ my nose and playin’ in the hog waller know.
Dallas, I hope that I did not hurt your feelings or anything like that.
If I did, I sincerely apologize, this was not my intention.
I just tried to say that all day long i work around machinery using this kind of technology and so far I did not see any
thing that would work for swirling saw dust.
I work for a pharmaceutical company

-- Bert

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#13 posted 03-08-2013 08:59 PM

I am not sure but I do not think that the vacuum or the air flow rates varies as the trash can get full.
I do not know why it would.
Bill a similar system already exist. I read that it works fine in wood dust but if the trash can is filled with fluffy wood chips, as produced by a spiral cutter head on a joiner or planer, the paddle just keep spinning.

http://www.pennstateind.com/store/BINSENSOR2.html

If your paddle if not powered as on the Penn State system but it is actuated by the air stream, how do you detected its motion or when it stops? An electronic eye?

-- Bert

View Bill Swartzwelder's profile

Bill Swartzwelder

174 posts in 601 days


#14 posted 03-08-2013 09:12 PM

How about a laser beam like the safety, on a garage door. Once the chips were high enough to totally block the light you could have it directed at a sensor. I realize that when running the beam would be intermittent from the flying debris, but you could use a sensor with adjustable sensitivity.

-- What if the Hokey Pokey really is what its all about?

View b2rtch's profile

b2rtch

4341 posts in 1737 days


#15 posted 03-08-2013 09:58 PM

Bill, check this post (mine)

http://lumberjocks.com/topics/46764

I have been examining many possible solutions in the last two weeks.
So far I did not find anything that seems to be fool proof.
The solutions with the most merits are garage door opener “safety light”,Ultrasonic Level sensor or a Capacitive Proximity Sensor. Also I have examined the idea of using a “dusk sensor” and a light bulb
http://www.amazon.com/Greenfield-DPPS-Weatherproof-Dusk-to-Dawn-Photosensor/dp/B002X78UVO

-- Bert

showing 1 through 15 of 26 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase