I think Matthias Wandel has a circuit that would work, a low parts-count delay-on relay board. I think he used it to replace the centrifugal switch in a belt sander motor.

Came here to make this comment, as for the nuts and bolts of it, it's painfully hard to beat the price of just buying one of the 99cent timer relay modules sold on ebay.

I agree, a delay for the vacuum to shut down after about 15 seconds or so. This also makes it so that if you move from one piece of work to another the collector motor isn't turning off/on constantly while switching work pieces (this part would require a longer delay, probably)

Slap a cap in parallel with the coil and a resistor in series. Easy cheesy!

Generally a shop tool stops making dust/shards for a few seconds before it's turned off anyway. My cuts are through and clear of the blade before I shut off the table saw. Same with the drill press or router. A delay mechanism might be a lot of work for no net gain.

and ....without an Arduino !!! :-) It's even more satisfying when the solutions is fully effective and when the solution is simple and inexpensive .... That puts a big grin on my face... :-)

Only a white guy would describe a black guy (and never another white guy) as "humble". This is another way of saying he's "tame", not t threat, etc. In fact, he's no different than any other KZfaqr. Well, he's smarter than most, and does not hide it, and why should he. I am not a BLMer or any other such nonsense, but I am surprised you didn't describe him as "articulate and bright."

​@@raymondjackson6069 What DumbAss statement on your part, only racist thought or comment, has come out of your mouth. Humility is a virtuous characteristic for anyone to have.

@@bobkelly3944 Whatever you say Bob. You must be a white guy, because only a white guy would term anything racially defined as racist. Obviously, you don't know what racism is or how it is practiced, its effects, or ramifications, yet you live it and enforce it every day. You seldom hear a white guy call another white "humble". This is a characteristic when used by white men to describe the perfect negro - for you. You're saying he's tame, not a threat. He's a nice guy, he's a brilliant guy, but I would not call him humble. He's just a man. Relating much-needed knowledge, and let's leave it at that. I would say, if you want cultural enlightenment or understanding, take a black history course or something, but the BLMers have screwed that up royally. So you're kinda on your own, but you seem to be trying to get there, so good luck to you partner.

@Raymond Jackson You must have a lot of issues from your childhood or something. The "original comment" that you commented on ( not mine ,to be clear) was completely absent of any malice or condescension. To read anything other than respect and goodwill into his comments shows how misguided and warped your thought processes are.

​@@bobkelly3944, aren't you virtuous. Look, I'm trying to school you, man. If you can't do that, you should just shut up. The more you talk, the more racist you sound in trying to explain away your latent and ingrained racism. You are a snide, self-righteous white guy, spewing those superlatives to make you feel good about being white, while all the time, marginalizing this man by describing him by an adjective that ignores his humanity, by highlighting his imagined (on your part) subjugation (on your part) to you (on your part). This is your way of taking ownership of this guy's soul. I am done with this, partner, and hope somewhere you can find Truth.

Clever!

@@mannys9130 Except I would bet quids he said collar - maybe it's the accent...

This gave me a genuine laugh

we all know you are here just to see if the air in the dust collector flows in a laminar way....

@@oskimac Spoiler: it won't

@@oskimac hahaha 😆

I wonder how long it took Jeremy to get it apart after it was siliconed? That stuff is like glue.

If he was my neighbor he would hate me. Probably think I'm trying to get with his wife, I'd be over his house every day lol

Whether you can prove it or not, it seems like such a cheap solution you might as well try it.

Yeah I've been shocked from my first CNC router dust collector hose when cutting plastic. Never tried grounding that one. At work we move starch through a plastic chute and it has a copper wire wrapped around the outside of it. No problems. Down at our sister plant that makes polystyrene beads and air-veys them into railcars, you will get a static shock that knocks you down if you touch an ungrounded chute while it's loading. Some shocking moments to be sure.

Yes, it happens in industrial usage, but there are no reports for home shops. The volume of air is not high enough

As Mr. Fielding said, I've never heard of a documented actual case of a static-caused fire in a home workshop. If it's really a concern, plumb your DC system with metal pipe. (Heavier gauge than typical HVAC pipe, which has been reported to collapse from the vacuum pulled by a DC system.)

can you run a copper wire inside a section of the pipe near the collector to get rid of the charge?

Pro Tip: The problem with automation is it introduces points of failure. The more you automate, the more likely your automation will fail. I learned that the hard way after automation everything in my house. Finally, I got to the point, that once it failed, I just removed it, rather than bothering to fix it. Now I'm all manual. Problem-free manual is better than automated and broken.

Systems Planet I’m an automation technician, and my favorite pastime is fixing stuff... so I beg to differ. 😂 everything I’ve automated so far has worked great, with two exceptions. Both things I made more efficient designs and wanted to replace anyway! Lol.

Automation can be awesome, but only when it works as needed every time without any issues. It has it's downsides in the loss of operational skills, thought on what you're doing, and in distancing the human element from the work you're doing. Some of us simply prefer simple and hands-on even if something 'better' is possible.

@@SystemsPlanet power

@@SystemsPlanet Yes and No. The problem with automation that is badly engineered is it fails during its lifetime. If you want to use your shop dust collection system without redesign or maintenance for 10 years then you need to design it to last 20. Using flimsy plastic blast gates with a 2 year life expectancy will have predictable results. Using quick wiring connections used for test rigs rather than soldered joints will have predictable results. Automation is just engineering, it has to be designed. What I can see of this system is it's very well designed, and looks well engineered. Connections are solid, virtually no use of bailing wire or duct tape ... great job all and all.

Thanks for the NFPA reference. An even worse condition is created when PVC or PP piping is used for clothes dryer venting or paper dust from shredders. The static charge from air flowing through the PVC causes all of the dust and lint to be come charged and stick to everything. This causes buildup of fuel for fire. Always use metal vent material and provide good bonding and a ground. It is illegal to use plastic piping for clothes dryer venting for a reason.

It's very difficult to effectively ground PVC pipe and plastic blast gates. Grounding the system by attaching a wire to the PVC is not a solution. The vent vent pipes on tanker inert gas systems are very susceptible to corrosion and static charge buildup. Bondstrand 7000M piping was developed to provide a glass reinforced pipe that was conductive and could be grounded. Flanges and couplings are conductive and can be grounded. Bondstrand 7000M is not inexpensive, but is conductive. It is meant for industrial useage. Overall galvanized vent ducting is probably the most cost effective choice. If you use a blast gate or valve that is made from a non-conductive material, such as wood or plastic you need a bonding wire to assure the sections of duct do not become isolated.

As long as it's not the Ferrari dealer. Those idiots don't even know what a superseded part number is. They'll just say they don't have it and can't get it.

@@billybobjoe198 don't seem to have any problems with my Ferrari. 😂

With enough persistence and time unobtanium can be found. I dug up what may have been the last new ignition coil for my very old weedeater that way- it was an underengineered part and they all fail. So when I got the "ain't got any" answer I always asked advice on who might have it then followed up every lead. A year of looking off-and-on and I found it at a backwoods shop ran by a man who was once a big city dealer but retired to Idaho about the time it went out of production, taking all his inventory with him. The guy who mentioned him had once worked for him in the big city a thousand miles away and guessed that there wasn't much call for weedeater parts in a forest so he might still have one- and he did! Not only that, but he let me have it at the decades-old price too. Someone somewhere has what you need in usable condition; you just gotta find them, that's all.

@@P_RO_ I admire your tenacity. Most of us would have just bought a new tool after the first couple calls.

Hi Greg, I agree with what your saying totally. The Blast gate may be a very inert item to think about safety for, but that's where your head should constantly be when building automation into the shop. The Whole "What If" mentality. I have had some experience with home brewed automation failures that were quite costly which -finally- got me to think about the "What If's" before putting the system together. I love what Jeremy did here and, let's be honest , even with no thought about safety, things will probably work out if something happened. The thing I think Greg and I are trying to get across is Having the mindset when you start into a project so that your thinking about those "What If's" as your going along. Ok, Rant off...

@@tgirard123 It's obvious you two work in industrial environments. Where I work, safety is drilled into your head. It's to the point I walk around in public, roll my eyes and cringe at all the safety hazards I see, even the smallest ones.

As a retired industrial instrument installer/technician, I have seen a lot of safety features added under the 'what if' scenarios. Most were instituted to mitigate losses due to human error in day to day operations. The rest were to stop losses due to actions beyond operator control, such as weather, power failure, mechanical malfunction, software failure, etc. After several years of gate automation experience, I have redesigned my own blast gates to compensate for such things as the loss of power or control signal/air. After adding positive stop position switches and a full chip drum or clogged filter shutdown, and just about all the fun is removed. Mine has an alarm for each gate with an LED start-up sequence to simplify troubleshooting in case there is a failure.

I am a plumber and shadetree mechanic. I cant see silicone being a bad option.

It is not like this is a high pressure pump... It will last for years, and is easy to reapply if necessary.

I always forget that arcing causes EMI as well, and it doesn't have to be that near to affect devices.

How does one ground Plastic? As a former electrician (20 years ago) we would bond/ground the metallic parts by running a jumper in parallel with the plastic part (seal tight for example) and bond the connectors. Although the plastic seal tight with plastic connectors was never bonded.

Grounding it all is definitely worth the effort.

I was running some lumber through a drum sander, and kept getting "burned" by the chassis. Eventually figured out that the friction of the dust on the collector hose was generating a HUGE voltage differential, and I was the only path to ground when I got too close. I was going to add an arduino-driven dust gate and run a signal wire back alongside the pipe to the dust collector's relay-driven power switch, but would want to REALLY ground everything to avoid having the circuit board fried when the input pins suddenly jumped to 700v.

@@Reign_In_Blood_963 most effective way would be to run a conductor along the inside of the pipe in contact with the interior sidewall since that's where most of the static charge is and gave it an exit somewhere near a grounding point. Alternately if the system already exists, use some kind of metal strapping (like the stuff with the holes all along its length) and screw through that at intervals all the way to the interior of the pipe to conduct the static charge outside. Strictly speaking you would need several conductors around the circumference of the pipe to maximise static reduction since the plastic pipe doesn't efficiently conduct charge around it's surface. In a home setup it's unlikely to generate enough static to a significant risk, and the duty cycle would probably give sufficient time for the charge to self dissipate anyway.

I can tell you the static generated by my dust collector is not low energy if im doing a process that generates a large amount of particles for extended periods. Obviously Im not grounded but I'm considering adding some sections near high touch points just to eliminate those jolts. I swear ive been hit by discharges 3-4 inches away, and while not particularly dangerous, is really annoying.

I just ran some aluminum tape on the outside of my pipe from the dust collectors case, to the end of each run. Also put it around the connections for extra sealing. Eliminated all of the static and increased the suction for a small price and very little time!

He's right about the particle size. its also a concentration issue. you need to reach a minimum concentration in the air for it to be explosive, same as grain dust. if you clean out the collector regularly it should be low risk. the catch bin is where you have the greatest risk because the air flow through the pipe would make reaching critical concentration difficult.

I've gotten them from Grainger before. Grainger is usually very high priced on many things and they charge a premium for having stuff in a "brick and mortar" but their die cast zinc pulleys for v-belts were actually priced competitively.

There is a video on that saw somewhere...oh, was the video right before this: kzfaq.info/get/bejne/nbOGfMd1sM2rZXU.html As for the pulleys, I think he uses a lot of salvaged parts like treadmill motors and such that have them, but you can get some on kinda cheap from ebay, or if you're not too picky on the sizing, a u-pull-it auto parts yard can get you come on the cheap.

I have a local store that sells pulleys of various shapes and sizes... (Tractor supply) ... If I need something that they don't carry... then I order from McMastercarr online.... Northern tool might also have what your looking for...

It should be fine in his case because he has plenty of non-glued joints and very large diameter pipe. An overpressure event of even 1/2 atm would produce ~90lbs of separation force to every unglued joint, which should prevent any serious over-pressures by simply releasing them into open air.

@@avialexander Without knowing the air's velocity, volume, temperature, and %RH, in addition to how quickly the valve is shut; you can't know the developed pressure or the shock it would induced into the system. I stand by my potentially over-cautious warning. But, I doubt anyone can tell video guy that his system is safe, and have numbers to back it up. Also, he said that he wasn't using SCH 40 pipe, he was using drainage pipe. This is usually SDR35 and unlike solid walled PVC, it's aerated PVC, kind of like a foam. This pipe is strictly for unobstructed drainage, it has no pressure rating. Shock happens faster than the non-glued joints can slip apart.

@@cornpop7805 Interesting points. I'm a CFD engineer, so I know nothing about PVC pipe. What I do know is fluids. And shocks travel at the speed of sound, which in air is 1125 fps, and if you want to ignore effects of compression, divide that by three, so ~350 fps. I'd estimate his duct system's longest branch is ~35 ft, which means that the pressure equalizes in the entire system in 0.1 seconds or less. So to get a pressure spike, he'd have to close the gate in 0.1 seconds. In the video that's not the case, but it could be done. If you wanted to evaluate it at that speed, then you'd have to start using those properties you mentioned as well as dynamic compression effects. I'm sure there's a table somewhere to do it quickly.

@@avialexander I mentioned this in my original post, but I've seen SCH 40 PVC pipes shatter and giant duct work crush, both due to the introduction of a complete and sudden restriction in air flow. Both times, someone could have been killed. I'm not saying that I'm sure that the piping system in the video presents as much danger, but the pipe is thin, weak, and unrated. That's a large enough motor and impeller to make me think the air has meaningful velocity. We both know that F=MA and air has mass, as does the debris. I woudn't feel right to see a similar setup and not offer a word of warning. It would be interesting to figure or test this system out. I've done some CFD and associated R&D. Fluid dynamics is a pretty complicated subject. It certainly takes a properly parameterized model to give you reasonably good results. In order to prove the software worked well to our owners, we had three different engineers (plus the CFD seller) working seperately to model the same peice of somewhat simple air handling equipment. We had lots of real pressure and flow measurements - plus video of smoke tests for the equipment, but all we got to work with was the fan specs and the geometry of the equipment. None of us came up with similar results to the real numbers. So, the software failed our owner's tests. We did further testing, where we ended up creating several simplified versions of equipment, then parameterize the models to match reality. We eventually came up with parameters for each architype, to use in similar cases. Without that feedback, our CFD software wasn't as good as our experienced guesswork. Even the software company's best engineer failed to create an accurate model, without some real world feedback. The systems we were building were no more complicated than a residential refrigerator. I started cheating and created dumbed down models of our equipment, this helped the software perform better. It really threw it off to have small complex interfaces and tight corners. My simulations also ran in a couple hours, rather than 10 or 12.

could put a delay on the blast gates