Difference between revisions of "Dust Collection"

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* Wood dust in equipment motors and bearings shortens their operating life  
 
* Wood dust in equipment motors and bearings shortens their operating life  
 
* The dust collection system protects our people and equipment by removing wood chips and dust (down to 0.5 micron diameter) from the shop environment
 
* The dust collection system protects our people and equipment by removing wood chips and dust (down to 0.5 micron diameter) from the shop environment
 +
 +
 +
This page highlights basic operation and maintenance of the Wood Shop Dust Collection system.
 +
 +
See the [[Dust Collector Parts]] page for orientation on what the equipment is, what it's called, suppliers, and build instructions
 +
 +
See the [[Dust Collector Design]] page for design basis, designs and design guidance for tool hoods, and tips and tricks for hooking in to or expanding the system.
  
 
== Operation ==
 
== Operation ==
−
See the [[Dust Collector Parts]] page for orientation on what the equipment is and what it's called
 
  
 
=== Safety Rules ===
 
=== Safety Rules ===
 
==== Fire Safety ====
 
==== Fire Safety ====
−
* Hot embers falling into dust collection bins are the #1 cause of fires in dust collection systems, so:
+
* Hot embers falling into dust collection bins are the #1 cause of fires in dust collection systems, so ...
−
** NEVER NEVER NEVER NEVER cut metal on any tool that is using the dust collector. This includes metal nails, screws, staples in wood.
+
** NEVER NEVER NEVER NEVER cut metal on any tool that is using the dust collector  
 +
** Do not use the dust collector with wood with metal nails, screws, or staples
 
** If a cutting tool is burning wood, slow down or replace with a sharper tool
 
** If a cutting tool is burning wood, slow down or replace with a sharper tool
 +
* Any fine metal shavings create a hazardous condition in the dust collector
 +
** Air velocity in the ducts is not enough to keep metal shavings suspended
 +
** Metal fires cannot have water on them, so are incompatible with our sprinkler system, so ...
 +
** NEVER NEVER NEVER NEVER cut metal on any tool that is using the dust collector
 
* Two sheets of drywall act as a firewall between the dust collector drum and the neighboring work bench. Do not move this firewall.  
 
* Two sheets of drywall act as a firewall between the dust collector drum and the neighboring work bench. Do not move this firewall.  
  
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=== Basics ===
 
=== Basics ===
−
# Set the gates
+
==== 1. Set the Gates ====
−
:: [[File:DC gate open.JPG|150px]] Open a gate to get dust collection at a tool
+
[[File:DC gate open.JPG|150px]] Open a gate to get dust collection at a tool, 
−
:: [[File:DC gate closed.JPG|150px]] Close a gate to block air flow
+
[[File:DC gate closed.JPG|150px]] Close a gate to block air flow
−
:: * Dust collector capacity is one tool at a time
+
* Dust collector capacity is one tool at a time
−
:: * Open the gate for the tool you are using
+
* Open the gate for the tool you are using
−
:: * Check that all the other gates are closed
+
* Check that all the other gates are closed
−
 
+
==== 2. Turn on Dust Collector ====
−
## Turn on Dust Collector
+
[[File:DSC 7264.JPG|150px]] Flip the switch. There are 2: one to the left of the entrance to the Wood Shop, one to the right of the Cyclone.
−
:: *
 
  
 +
== Maintenance ==
  
 
=== Swap Dust Collection Drum ===
 
=== Swap Dust Collection Drum ===
 +
[[File:DC drum ready.JPG|150px]]
 +
[[File:DC drum lid unlatched.JPG|150px]]
 +
[[File:DC drum swap.JPG|150px]]
 +
[[File:DC drum lid unlatched.JPG|150px]]
 +
[[File:DC drum top ready.JPG|150px]]
 +
[[File:DC drum ready.JPG|150px]]
  
−
 
−
 
−
== Maintenance ==
 
 
=== Cleaning the Filters ===
 
=== Cleaning the Filters ===
 
* Cleaning frequency depends on filter pressure drop, which we aren’t measuring yet. Expect monthly or quarterly cleaning frequency
 
* Cleaning frequency depends on filter pressure drop, which we aren’t measuring yet. Expect monthly or quarterly cleaning frequency
 
* Filters are cleaned by blowing compressed air from the outside to dislodge the dust cake on the inside, waiting to let dust settle into orange buckets under the filters, then unscrewing the buckets to empty the dust.
 
* Filters are cleaned by blowing compressed air from the outside to dislodge the dust cake on the inside, waiting to let dust settle into orange buckets under the filters, then unscrewing the buckets to empty the dust.
 
* Wear a dust mask to open and empty the buckets
 
* Wear a dust mask to open and empty the buckets
−
 
−
== Design Basis ==
 
−
 
−
This system follows design guidance on [http://billpentz.com/woodworking/cyclone/index.cfm#index.cfm/ Bill Pentz’s dust collection website].
 
−
 
−
Most dust collection hardware is designed to capture only larger wood chips and sawdust, but fine dust is the most dangerous to human health and most easily propagates fires. Bill Pentz's dust collection designs and recommendations deal with collecting fine dust. This system uses higher air flows, a more efficient cyclone, and finer filters than are found in most off-the-shelf dust collectors.
 
−
 
−
=== Air Flow ===
 
−
* air flow target is 850 CFM at the tool, which is enough to capture fine dust that is generated
 
−
* minimum air velocity in ducts is 4000 FPM, which is needed to move dust up vertical rises and to keep dust collecting in ducts
 
−
* blower has a 2 hp motor and 12 inch impeller
 
−
* Two Wynn Environmental 9L300NANO filters supply 600 sq.ft. filtration media. Expectation is 99.99% filtration of particle bigger than 0.5 micron diameter once filters are conditioned (meaning once a cake of fine dust is built up inside the filter).
 
−
 
−
=== Gates ===
 
−
This system will support collecting dust from one tool at a time. Gates must be installed and used to route flow to the tool that is being used and to block air flow from all other tools. Some starter design resources for gates:
 
−
* [http://www.benchmark.20m.com/articles/BlastGate/blastgatebuilding.html/ Basic manual gate from sheet stock]
 
−
* [https://www.youtube.com/watch?v=7zlNimxZgqw/ Simple actuators]
 
−
* [https://www.youtube.com/watch?v=HAMYaCIXXYU/ Arduino system to automate routing]
 
−
 
−
=== Tool Hoods ===
 
−
* Hooking a hose up to the off-the-shelf wood chip collection port on most tools is not sufficient for fine dust collection
 
−
* Installing a port that is too small restricts airflow. This creates a fire hazard by allowing dust to build up in the ducting
 
−
* Lots of designs and guidance on [http://billpentz.com/woodworking/cyclone/ducting.cfm#tool_ducting/ Bill Pentz's tool ports and hoods page]
 
−
* Hack on!
 
−
 
−
=== CNC Dust Skirt Guidance ===
 
−
* The current (Nov 2017) CNC dust skirt restricts airflow too much for safe and adequate dust collection
 
−
* minimum cross-sectional area of the skirt air channel opening must be 20 sq inches
 
−
* flex hose form the skirt to the ceiling ducts must be 6" diameter. Smaller diameter will choke flow below 4000 FPM needed to transport dust to the ceiling
 
−
* [http://www.instructables.com/id/ShopBot-Dust-Skirt/ gerg on instructables.com] has an upgraded skirt design with [http://www.instructables.com/id/Magnetic-ShopBot-Dust-Skirt/ instructions and DXF files].
 
−
* [https://www.youtube.com/watch?v=ORcFKRRFWt0/ Here's a design] for the flex hose that uses a vertical rise of rigid 6” PVC pipe to clear the CNC gantry, then 6” flex hose to ducts in the ceiling. The video shows a motion test of his flex hose suspension layout.
 
−
 
−
=== Static Discharge from PVC Ducting ===
 
−
* [http://www.woodcentral.com/articles/shop/articles_221.shtml is not considered a fire hazard for small woodshops]
 
−
* but is very uncomfortable for humans and fatal to thumb drives full of Shopbot files
 
−
* [http://billpentz.com/woodworking/cyclone/ducting.cfm#static_electricity/ Bill Pentz’s static electricity section] recommends 2" aluminum tape to bleed static
 
−
* Joints in our dust collector are made by first putting a band of 2" aluminum tape around the duct, then drilling 1/2" sheet metal screws through the joint to pierce the inner duct wall and stick into the airflow. Grounding the tape and screws provides a path to bleed some static from the flowing wood dust stream.
 
−
 
−
=== Upgrade Path ===
 
−
The system has an upgrade path to support 2 tools simultaneously. This would involve installing a 5hp motor and a larger impeller available from Clear Vue Cyclones for 1800 CFM design flow. It would also require some ducting changes, starting with installing an 8" header that the 6" line branch out from.
 

Latest revision as of 21:59, 12 January 2019

[Equipment|Back to list of Equipment]]

Lvl1 qr header.png
Dust_Collection&.png

General

  • Owner/Loaner: LVL1
  • Serial Number: NA
  • Make/Model: dust collector
  • Arrival Date: 2016
  • Usability: yes
  • Contact: Paul Gossen
  • Where: wood shop
Dust collector.jpg


Purpose

  • Breathing wood dust is a health hazard
  • Wood dust build-up around the shop is a fire hazard
  • Wood dust in equipment motors and bearings shortens their operating life
  • The dust collection system protects our people and equipment by removing wood chips and dust (down to 0.5 micron diameter) from the shop environment


This page highlights basic operation and maintenance of the Wood Shop Dust Collection system.

See the Dust Collector Parts page for orientation on what the equipment is, what it's called, suppliers, and build instructions

See the Dust Collector Design page for design basis, designs and design guidance for tool hoods, and tips and tricks for hooking in to or expanding the system.

Operation

Safety Rules

Fire Safety

  • Hot embers falling into dust collection bins are the #1 cause of fires in dust collection systems, so ...
    • NEVER NEVER NEVER NEVER cut metal on any tool that is using the dust collector
    • Do not use the dust collector with wood with metal nails, screws, or staples
    • If a cutting tool is burning wood, slow down or replace with a sharper tool
  • Any fine metal shavings create a hazardous condition in the dust collector
    • Air velocity in the ducts is not enough to keep metal shavings suspended
    • Metal fires cannot have water on them, so are incompatible with our sprinkler system, so ...
    • NEVER NEVER NEVER NEVER cut metal on any tool that is using the dust collector
  • Two sheets of drywall act as a firewall between the dust collector drum and the neighboring work bench. Do not move this firewall.

Personal Safety

  • Wear a dust mask when emptying the dust collection drum and buckets

Basics

1. Set the Gates

DC gate open.JPG Open a gate to get dust collection at a tool, DC gate closed.JPG Close a gate to block air flow

  • Dust collector capacity is one tool at a time
  • Open the gate for the tool you are using
  • Check that all the other gates are closed

2. Turn on Dust Collector

DSC 7264.JPG Flip the switch. There are 2: one to the left of the entrance to the Wood Shop, one to the right of the Cyclone.

Maintenance

Swap Dust Collection Drum

DC drum ready.JPG DC drum lid unlatched.JPG DC drum swap.JPG DC drum lid unlatched.JPG DC drum top ready.JPG DC drum ready.JPG

Cleaning the Filters

  • Cleaning frequency depends on filter pressure drop, which we aren’t measuring yet. Expect monthly or quarterly cleaning frequency
  • Filters are cleaned by blowing compressed air from the outside to dislodge the dust cake on the inside, waiting to let dust settle into orange buckets under the filters, then unscrewing the buckets to empty the dust.
  • Wear a dust mask to open and empty the buckets
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