4 ms·

You've never seen a brushed motor on a woodworking tool? Brushed motors are standard, and until recently brushless motors were simply not available or were very

You've never seen a brushed motor on a woodworking tool? Brushed motors are standard, and until recently brushless motors were simply not available or were very expensive. Most of my tools are Makita (Japanese, excellent quality), and apart from a cordless track saw, all of them have brushes. Drill, electric planer, thickness planer, shop-vac, mitre saw, table saw (Dewalt), jig saw, orbital sander, corded Fein saw... all brushed.

MarkMarine 4y ago
Hand tools are not what I’m talking about, I’ve got 3 powermatic tools in my garage that all have sealed case motors.
- frosted-flakes 4y ago
  Thickness planers, shop-vacs, table saws, and mitre saws, as well as pillar drills and jointers/surface planers are not hand tools, or even cordless. Your powermatic tools probably use 3-phase power, but that is simply not necessary for home workshops, nor is it a mark of quality or safety.
  - MarkMarine 4y ago
    Single phase 240v, but I still fail to understand your point. You're saying that brushed electric motors are a fire risk in an environment with wood dust, and therefore dust extraction is a matter of industrial safety in a woodshop? What is the allowable amount of wood dust in the air before it's a fire risk? If this is actually a risk, and dust extraction is far from perfect in an industrial setting, why aren't we requiring explosionproof motors and light switches, as you would if you're in an environment with this kind of airborne hazard? Sealed motors are allowable in class 2, expected actually, and I don't see wood dust on any class 2 listing of hazards. Or are you proposing that industrial dust collection is perfect, and wood dust isn't being ejected into the air when you've got a good industrial system? This just strains credulity, I've designed the electrical systems for class 1 and 2 locations, and wood dust at worst would be class 3. I think you're talking out of your depth.
    - frosted-flakes 4y ago
      I'm not the OP. I never claimed that sawdust in a home woodshop is a fire risk (it's not), just that brushed motors aren't what you make them out to be.
      - MarkMarine 4y ago
        There is a difference between brushed motors that are open, vs sealed. A sealed brush motor complies with class 2, explosive dust environments. Actually explosive, like grain. But not class 1, where you have explosive gas mixture environments, there you need an explosion proof motor casing that can contain the explosion. If you have a properly size electric motor, with a sealed case, it’s not a problem in a wood dust environment. You’re still responsible for sweeping up the dust, to comply with fire codes for a bunch of other reasons.
    - brudgers 4y ago
      A US fire marshal is likely to require compliance with NFPA 664 Standard for the Prevention of Fires and Explosions in Wood Processing and Woodworking Facilities https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=664 https://www.nfpa.org/codes-and-standards/all-codes-and-stand... Among other requirements.

MarkMarine 4y ago

Hand tools are not what I’m talking about, I’ve got 3 powermatic tools in my garage that all have sealed case motors.

frosted-flakes 4y ago
Thickness planers, shop-vacs, table saws, and mitre saws, as well as pillar drills and jointers/surface planers are not hand tools, or even cordless. Your powermatic tools probably use 3-phase power, but that is simply not necessary for home workshops, nor is it a mark of quality or safety.
- MarkMarine 4y ago
  Single phase 240v, but I still fail to understand your point. You're saying that brushed electric motors are a fire risk in an environment with wood dust, and therefore dust extraction is a matter of industrial safety in a woodshop? What is the allowable amount of wood dust in the air before it's a fire risk? If this is actually a risk, and dust extraction is far from perfect in an industrial setting, why aren't we requiring explosionproof motors and light switches, as you would if you're in an environment with this kind of airborne hazard? Sealed motors are allowable in class 2, expected actually, and I don't see wood dust on any class 2 listing of hazards. Or are you proposing that industrial dust collection is perfect, and wood dust isn't being ejected into the air when you've got a good industrial system? This just strains credulity, I've designed the electrical systems for class 1 and 2 locations, and wood dust at worst would be class 3. I think you're talking out of your depth.
  - frosted-flakes 4y ago
    I'm not the OP. I never claimed that sawdust in a home woodshop is a fire risk (it's not), just that brushed motors aren't what you make them out to be.
    - MarkMarine 4y ago
      There is a difference between brushed motors that are open, vs sealed. A sealed brush motor complies with class 2, explosive dust environments. Actually explosive, like grain. But not class 1, where you have explosive gas mixture environments, there you need an explosion proof motor casing that can contain the explosion. If you have a properly size electric motor, with a sealed case, it’s not a problem in a wood dust environment. You’re still responsible for sweeping up the dust, to comply with fire codes for a bunch of other reasons.
  - brudgers 4y ago
    A US fire marshal is likely to require compliance with NFPA 664 Standard for the Prevention of Fires and Explosions in Wood Processing and Woodworking Facilities https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=664 https://www.nfpa.org/codes-and-standards/all-codes-and-stand... Among other requirements.