Laser Training Meeting Notes 2016 07 20

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  1. Laser cutter training planning meeting

July 20, 2016

Amalgamated to do list: - Build training materials in wikimedia format as an outline - Ruth to run this and pull in people as needed - Adrian and Ryan to share Epilog manual (done and in slack) - set up a donation box - Ryan - Emma contacting owner of 100W laser cutter at Yale to see what he uses for safety - try to get the tech shop laser safety materials - Emma planning to go tomorrow to ask - Adrian and Scotty to test the software and make sure drivers are installed

 connection to the machine works enough to upload and download files from the machine, probably the rest works too --augur

- verify software tells time per cut - Adrian

 records time per job-type/file, also possibly records time for current job, will add more information on 21 Jul 2016 --augur

- Password on computer needs to be changed - Adrian

 password is changed, contact augur/darryl or akelly/adrian if necessarry --augur

- Adrian measuring under the mill

 42" deep x 46" wide --augur

- meeting about laser maintenance for September: Loosely set for Thursday September 15 at 7pm

    1. Objectives

1. Organize the materials we have into a single training methodology What we have:

  • 10 Kaitian PDFs
  • Yale safety training
  • Adrian has an Epilog repair manual, which is for all laser cutters generally

- we should condense this down into a couple pages - Scotty hasn't seen key parts of what he would want to see in training manuals

 - any training around materials (for example, you shouldn't cut PVC, how to figure out if something is PVC, power settings for things)

- we should build up a reference for materials - what to do when someone wants to cut something no one else has tried before

 - this should require a scientific approach to make sure you don't damage the laser
 - random people shouldn't be allowed to laser non standard materials
 - we should have a process

- people are going to need to know how to focus the laser, not crash the head, general material savvy-ness - Emma has all of the settings for all of the wattages!

 - there are ranges, so we have to test to see what settings are best for what materials

- Trent has a digital copy of all the materials in his email - video is good for things like focusing the laser cutter - written document is best for now as the primary material (with embedded video links) - Need a materials white list, need to optimize on more exotic materials throughout time - need to address materials that have chlorine, especially plastics

 - from a human safety perspective some chlorine might be OK, but it's bad for the laser

- whitelist: acrylic material for laser cutting, cardboard, cardstock

 - not wood yet because some heavier woods won't cut through
 - consensus process for anything else

TO DO: - Build training materials in wikimedia format as an outline - Ruth to run this and pull in people as needed - Adrian and Ryan to share Epilog manual (done and in slack)

2. Discuss the method by which training is and is not diseminated - training is propagated from people who are trained to give people training (members?), and those people can recruit people to train others - people who train people can train others, but people who are trainees cannot train others - three tiers: user, teacher, teacher of teachers - thinking about a 2 tier only possibility: any trainer can train a new trainer (but this would be a separate process from training a new user) - light weight: trainers can train people, and we need a consensus to induct a new trainer - would also be good to have some canonical training material (videos, etc.) - we don't have to worry about scalability early on, consensus among trainers to add new trainers is fine for now - *users are not trainers*

 - this knowledge can be propagated by a quiz at the end of training
 - the quiz is maybe too formal for our current culture
 - maybe a pledge would be more appropriate
 - quizzes are good for memory generation though - Trent uses it for standard operating procedures (good as a training tool rather than as a filter)

- later we will have to figure out what to do about trained people using the laser unsafely - untrained users should not use the laser

 - this is different from every other tool at noisebridge, which people can use even if they've been trained elsewhere
 - this needs to be made clear to the user

- at Yale there was one person in charge of the software, and they had a list of people they trusted enough to operate the laser cutter by themselves - days for beginners? laser cutter training? - yale made a training video with usage guidelines and emergency procedures

 - all of the sections of the yale safety training sheet apply to us
 - general material guidelines (power = deeper cut but lower resolution, how to not set cardboard on fire, etc.)

TO DO: - set up signage: don't use unless trained, recommended donation - set up a donation box - Ryan

3. Fire safety equipment: what do we need to get to be safe - fire safety the only blocking thing moving forward - Emma is the expert - fire extinguisher + water squirt bottle? (this is what tech shop has)

 - water squirt bottle is better for small fires in the machine, for the machine

- compatibility with other fire safety equipment in the sparkle forge? - there are 4 fire extinguishers elsewhere in the space (ABC dry chemical)

 - Trent can take one of these for when he's using the torch

- Emma says class C fire extinguisher is fine. If you see a fire, use the fire extinguisher. This is what people use in labs. - Certain fire retardants are really bad for laser cutters (corrosive dry powder) - Halotron is expensive, but isn't damaging for electrical equipment, and can be hard to use to put out a type A fire (wood/paper) - labs that have chemicals and stuff will just use an ABC extinguisher - technically you could have a separate extinguisher for the laser cutter, but when people panic they might not use the right one - Halotron is a liquid that vaporizes to starve the fire of oxygen, but you need a 10-15 gallon one (couple hundred dollars) for A/B/C rating

 - recommended by Epilog

- other things in the room: lathe, kiln

 - if anyone is doing titanium or magnesium on the lathe then you need a type D extinguisher
   - these are big and expensive

- deionized water bottle is good too - if you see a flame, just turn off the laser (either by lifting the lid or pressing the power button), and then open the lid

 - we're not sure if it's better to turn off the ventilation with the power - with everything else Emma's worked with, the two are joined

- Emma had 2 laser cutters catch on fire at Yale

 - improper speed/power
 - stressed out students
 - cardboard
 - Adrian saw a fire catch on a build up of material under the bed

- halotron 11 pound is A-rated (smallest A-rated one), cheapest one is $315, not sure how long it will last / need to be recertified - fire standards recommend that extinguishers be looked at for obvious damage every 30 months and inspected every year

 - halotron tanks need to be emptied and inspected every 6 years and checked for hydrostatic every 12 years

- no metals for now TO DO: - Emma contacting owner of 100W laser cutter at Yale to see what he uses for safety - try to get the tech shop laser safety materials - Emma planning to go tomorrow to ask

4. Software - do we have the software set up correctly? - does it work? - currently Trent knows how to use it - fewer number of people can spend time troubleshooting the software outside of now TO DO: - Adrian and Scotty to test the software and make sure drivers are installed

5. Donations and tracking them + maintenance - in the short term we should lock on having a highly technical way of doing this - something simple, for example, a donation box next to the laser cutter with a recommended/required donation - NYC resistor has software where people (by honour system) track how many minutes they cut on. They charge $1 per minute - laser tells you how many minutes your cut took - we just have to cover cost of maintenance (we got the laser for free) - we want laser to be as cheap as possible for people to use while being sustainable. Adrian calculates $3-5 per hour (this is based on industrial lasers, and the last machine he used charged $5 per hour)

 - Consumables
   - consumables are lenses ($200 from Kaitian, maybe cheaper on ebay. These get cracked from the heat of the laser. Adrian guesses 60 hours of cutting time per lens. Kaitian says up to 1000 hours of cutting time per lens.
   - tube costs a couple thousand dollars
 - continue this offline

- need to also discuss maintenance procedures

 - only some people should do maintenance
 - lenses need to be cleaned every couple hours of cutting time

- Adrian has a good Epilog maintenance resource - Emma has a check list for yearly maintenance TO DO: - calculate costs and make donation sign - install appropriate donation box - verify software tells time per cut - Adrian

6. Possibility of lockout mechanism - RFID solution doesn't fit minimum viable laser philosophy

 - talk to henner long term about RFID stuff
 - this can be used to track laser time

- computer has password (but someone could plug in their own computer) - need cryptographic usb key in order to use software, which is wire tied to the computer? (Trent says you don't need it to run the laser cutter) - something to prevent the whole thing from turning on at all? - for now only people who have been trained should get the password for the computer - possibility of adding user accounts - set a meeting time for us to talk about maintenance again in September - we can potentially have weekly maintenance, and anyone can show up for training at that time

 - concerns with wearing people thin

TO DO: - Password on computer needs to be changed - Adrian - discover what maintenance we need to do and how much - schedule meeting about laser maintenance for September: Loosely set for Thursday September 15 at 7pm

7. Material storage - sheet stock storage desirable 4 x 8 - ideally stored flat

 - storage area split into 2: communal and project storage
 - room under mill?
 - hidey hole above hot space (bad b/c the area below is all fireproof and we shouldn't put wood up there, plus Jarrod says we need it for air flow). Jarrod prefer flat stock storage to happen outside the workshop.
 - If we go vertical it'll be much easier to store, but it'll get warped and not flat for the laser focus.
 - Maybe in the corner up high?
 - 4x4 will be much easier to store
 - flashen tashen area might work for vertical storage
 - other option is that we don't have any storage (people docratically put their shit everywhere)
 - we already are using storage by crowding up the tables by the hack shelves
 - potential for pulley system for materials storage that can be hauled up out of the way?

TO DO: - Adrian measuring under the mill

8. Test run - group here should run the laser cutter before letting other people use it

9. Training components - Hazards & Safety - Tracking trained personnel - Materials cutting timelines - how to use the laser cutter - focal length, etc - emergencies & notifications (incl. maintenace notifications)