Group Minutes / Work log

• Unordered List ItemCardboard mock-up made
  • looks larger than expected
  • move fillport hole?
  • how does the top swing out?
  • rubber feet on bottom?

Temporary location for pictures

• HWLabs SR1 360 Radiator arrived
• Swiftech MCP-655 Pump (Laing D5) arrived
  • (Thanks to Jshay @ [H]ard Forums)

• Microcenter seriously messed up my order of barbs
  • We have G1/2 barbs now…
  • Need to reorder another batch of G1/4 barbs

• 90 & 45 degree fittings are too overpriced (cheaper ones are sold out)
• will bend tubing instead
  • use zip ties if it kinks

Draft of writeup complete

Need to do:

• Rubber Feet?
• Electrical mounts
• Top panel hinges
• Structure joints for all panels
• Convert Panels to CAD

thumb|300px|Current cooling system design.

• 6x 120mm fans (Assumed to be Yate Loon D12SH-12)
• Laing D5 / Swiftech MCP-655 Pump
• EK MultiOption RES 150
• 10x 1/2” ID Barbs
• 2x HW Labs 360 Radiators (Models to be verified)
• T Block (Possible switch to Q Block)
• Bitspower Temperature Sensor
• 2x 90Degree Elbows (Or barbs)
• 2x 45Degree Elbows (Or barbs)
• 2x Bitspower G1/4” F/ F Pass-Through Fitting
• 5/8” OD 1/2” ID Tygon Tubing

• Researched a possible alternative laser cooling system: CW-3000 Industrial Cooler
  • Link to e-bay [http://compare.ebay.com/like/370438043647?ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=171904412182&crlp=1_263602_304662&UA=WVF%3F&GUID=6f11de0e12c0a0e2044378d3feb9a523&itemid=370438043647&ff4=263602_304662 | here].
  • Link to a slightly more informative page [http://laser-tube.en.made-in-china.com/product/IopJRnEHOXVd/China-Industrial-Laser-Cooler-Water-Chillier-MT-CW3000-.html | here].

Costs $180 according to: Price_list.pdf

• Finalizing designs on Google Sketchup
• Ordered pump & 1 radiator
  • This radiator is of a different brand than the one designed for (less heat dissipating potential but is essentially the same dimensions)
  • $100 for both via [H]ardForum user “Jshay” ~Thanks

Need to:

• Research proprietary laser chillers
• convert acrylic walls in Sketchup to AutoCAD

Todo:

• panel mounts for
  • electronics connections
• Tubing

*Moving along with the cooling design in Google Sketchup *Checking with electronics group to see if we've given them enough space in the PSU compartment thumb|300px|Current cooling system design.

Todo:

• panel mounts for
  • Fillport
  • electronics connections
• Tubing

Messaged the user “love-happyshopping” on ebay regarding more technical specs on the laser, specifically, the operational temperatures of the laser. This is the user's reply:

1.Sorry, we do not have digital copy of the manual for this item. You can see the description from the following link:

Laser Manual

Technical Parameters

• Power output(W)：40
• Wavelength:10600nm
• Length（mm）：700
• Cooling System: Water Cooling.
• Triggering voltage(KV)：22
• Operating voltage(KV)：15
• Operating current(mA)：18

2.The performance of the laser have no request for temperature.

So we still do not have a precise goal of cooling 500W. The groups feels that the current setup of 2x(120.3) rads + 6 fans should be enough. It already has a second layer of safety (having 2 radiators rather than just 1).

love-happyshopping

Numbers! According to the vendor on [http://cgi.ebay.com/NEW-40W-CO2-LASER-POWER-SUPPLY-ENGRAVER-ENGRAVING-/230486852305 | Ebay]:

• Maximum output voltage:DC 25KV.
• Maximum output current: DC 20mA.
  • Therefore, max power = 25KV*20mA = 500W

According to [http://skinneelabs.com/pa120.3.html?page=4 | Skinnee Labs]

• Using a single Thermochill PA120.3 with 3 pull fans
  • The delta between ambient air and avg water temp will certainly be below 10C

We plan to use:

• 2 radiators: TA120.3 which should be better than PA120.3's
• 6 fans in a push pull configuration for each radiator
  • These fans correspond with the blue trend line on Skinnee's graph, but we will have twice as many fans

I estimate that with 2 of these radiators with a 6-fan push-pull configuration each, we will have a temperature delta of around 4C between ambient air and avg water temperature. 'Still need to find out the safe and optimal operation temperatures for the laser'

• Spoke to graduate student, Wei Dai
  • Our design is sound and legit
  • Discussed some hand-calculations
  • Need to find the operational temperatures of a CO2 laser
• Start planning the enclosure for the cooling

Emailed several companies for sponsorships / discounts

• Most declined
• Thermochill gave a somewhat promising response

• Presented on possible cooling system.
• Decided on water cooling.
  • Open loop could be a temporary solution.
  • Closed loop would be a better final solution.