Laser maintenance 2018-12-17, was Re: Big Red Out of Order
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Nick Bannon
Dec 17, 2018, 3:18:36 PM12/17/18
to artifact...@googlegroups.com
On Mon, Dec 17, 2018 at 10:22:00PM +0800, Blake Samuels wrote:
> Big red is still offline unfortunately. We are chasing issues with high
> voltage power supply or the laser tube itself.
>
> This is unrelated to the head crash previously noted.
>
> Investigations will continue Wednesday night.
After a year of the hour counter, at 78 minutes of laser-on burn time
per day...
Date Hour count
2017-12-10 1.6
2017-12-17 11.5
2017-12-30 31.2
2018-02-10 72.05
2018-03-05 95.8
2018-06-04 181.65
2018-07-02 234.8
2018-08-27 295.5
2018-09-24 326
2018-10-22 375.5
2018-11-29 426.9
2018-12-09 475
2018-12-17 488.9
The LC1290 recently started cutting very poorly in the last few days -
20mm/sec for 3mm MDF.
Adam F has a copy of the G.Weike LC1290 manual.
If the tube is failing; it's our third (second arrived broken) Reci W6,
installed around 2016-12, so it's had about 1000 hours burn time?
If the HV PSU is failing; it's our second MYJG-150 (150W),
USD$410+shipping, installed 2015-01. A suitable spare will probably be
cheaper and we're inclined to get one regardless.
We'll need to re-attach the HV cable; we have a portion of silicone tube
insulation as well, but could not spot the 3m pack from autobarn.com.au
($27.99 as of 2017-07-24, as seen here, 6mm inner diameter?:
https://www.amazon.com/Turbosmart-TS-HV0603-RD-Vacuum-Hose-Packs/dp/B004PPZ7L8)
If any relevant purchases are made please make sure they end up
reasonably well documented in email here or subcommittee minutes - item
description, price (sometimes you won't know until shipping, taxes and
exchange rates are taken into account), exact supplier, purchase date...
Often a select-copy-paste proof-of-purchase receipt will have everything
useful.
Installation date when we get to it.
https://wiki.artifactory.org.au/doku.php?id=subcommittee:laser-minutes-20181217
[...]
* LC1290/Big Red fault finding
* Laser is cutting very poorly, but displayed current is still OK
* If the tube is failing; it's our third (second arrived broken)
Reci W6, installed 2016-12? so it has had about 1000 hours burn time?
* If the HV PSU is failing; it's our second MYJG-150 (150W),
USD$410+shipping, installed 2015-01? A suitable spare will probably be
cheaper and we're inclined to get one regardless.
* Blake: Diagnostics yesterday 2018-12-16
* Cleaned mirrors, lens
* Checked alignment - OK
* No improvement ~20mm/s for 3mm MDF
* Tried to clean tube end
* Stopped cutting at all - just marking wood
* Still drawing 26mA
* Fault finding today
* We think could hear electrical arcing while laser running - 26mA
* Tried taking end cover off and recording video
* Cannot find actual arcing, possibly OK?
* STILL TO CHECK: Laser is operational, but is the plasma stable
at both ends?
* Look for arcing of power supply - find nothing
* Take out power supply: model MYJG-150 (150W)
* Look through insulation for signs of arcing
* Maybe arcing at crimp
* Test outside with dummy load. milli-Ammeter in series and 1000:1
HV probe with multi meter
* 102 kiloohm resistor (100W)
* When firing power supply ("Text" = "Test") button: 44mA, 4400V (193.6W)
* When connecting two dummy loads in series: 206 kiloohm: 42mA, 8700V (365.4W)
* The dummy loads do not drive the HV PSU at full power - 29000V (~750W)
* 130W to 145W output for ~20% power efficiency
* HV PSU models:
* Kellogg: BH-80W
* LG500/Little Red: MYJG-60 (60W)
* LC1290/Big Red: MYJG-150 (150W)
* LC1290/Big Red spare parts
* 2018-12-13 Blake: ordered laser head: AUD $70 (inc. GST)
* https://www.aliexpress.com/store/product/E-Series-CO2-Laser-Head-Focusing-Lens-D20mm-FL50-8-63-5-101-6-Mirror-25mm/1513187_32948855114.html
* ETA 2019-01-02
* 2018-12-14 Blake: ordered operations panel: USD $45.60 + shipping
* https://www.ebay.com/itm/Laser-Engraving-Cut-Leetro-Operation-Panel-PAD03-E-CO2-Laser-Controller-System/291953450952
* ETA 2019-01-22
* Spare HV PSU? USD$200--$450?
* Beam combiner+lens? USD$30?
Nick.
--
Nick Bannon | "I made this letter longer than usual because
nick...@rcpt.to | I lack the time to make it shorter." - Pascal
> Big red is still offline unfortunately. We are chasing issues with high
> voltage power supply or the laser tube itself.
>
> This is unrelated to the head crash previously noted.
>
> Investigations will continue Wednesday night.
After a year of the hour counter, at 78 minutes of laser-on burn time
per day...
Date Hour count
2017-12-10 1.6
2017-12-17 11.5
2017-12-30 31.2
2018-02-10 72.05
2018-03-05 95.8
2018-06-04 181.65
2018-07-02 234.8
2018-08-27 295.5
2018-09-24 326
2018-10-22 375.5
2018-11-29 426.9
2018-12-09 475
2018-12-17 488.9
The LC1290 recently started cutting very poorly in the last few days -
20mm/sec for 3mm MDF.
Adam F has a copy of the G.Weike LC1290 manual.
If the tube is failing; it's our third (second arrived broken) Reci W6,
installed around 2016-12, so it's had about 1000 hours burn time?
If the HV PSU is failing; it's our second MYJG-150 (150W),
USD$410+shipping, installed 2015-01. A suitable spare will probably be
cheaper and we're inclined to get one regardless.
We'll need to re-attach the HV cable; we have a portion of silicone tube
insulation as well, but could not spot the 3m pack from autobarn.com.au
($27.99 as of 2017-07-24, as seen here, 6mm inner diameter?:
https://www.amazon.com/Turbosmart-TS-HV0603-RD-Vacuum-Hose-Packs/dp/B004PPZ7L8)
If any relevant purchases are made please make sure they end up
reasonably well documented in email here or subcommittee minutes - item
description, price (sometimes you won't know until shipping, taxes and
exchange rates are taken into account), exact supplier, purchase date...
Often a select-copy-paste proof-of-purchase receipt will have everything
useful.
Installation date when we get to it.
https://wiki.artifactory.org.au/doku.php?id=subcommittee:laser-minutes-20181217
[...]
* LC1290/Big Red fault finding
* Laser is cutting very poorly, but displayed current is still OK
* If the tube is failing; it's our third (second arrived broken)
Reci W6, installed 2016-12? so it has had about 1000 hours burn time?
* If the HV PSU is failing; it's our second MYJG-150 (150W),
USD$410+shipping, installed 2015-01? A suitable spare will probably be
cheaper and we're inclined to get one regardless.
* Blake: Diagnostics yesterday 2018-12-16
* Cleaned mirrors, lens
* Checked alignment - OK
* No improvement ~20mm/s for 3mm MDF
* Tried to clean tube end
* Stopped cutting at all - just marking wood
* Still drawing 26mA
* Fault finding today
* We think could hear electrical arcing while laser running - 26mA
* Tried taking end cover off and recording video
* Cannot find actual arcing, possibly OK?
* STILL TO CHECK: Laser is operational, but is the plasma stable
at both ends?
* Look for arcing of power supply - find nothing
* Take out power supply: model MYJG-150 (150W)
* Look through insulation for signs of arcing
* Maybe arcing at crimp
* Test outside with dummy load. milli-Ammeter in series and 1000:1
HV probe with multi meter
* 102 kiloohm resistor (100W)
* When firing power supply ("Text" = "Test") button: 44mA, 4400V (193.6W)
* When connecting two dummy loads in series: 206 kiloohm: 42mA, 8700V (365.4W)
* The dummy loads do not drive the HV PSU at full power - 29000V (~750W)
* 130W to 145W output for ~20% power efficiency
* HV PSU models:
* Kellogg: BH-80W
* LG500/Little Red: MYJG-60 (60W)
* LC1290/Big Red: MYJG-150 (150W)
* LC1290/Big Red spare parts
* 2018-12-13 Blake: ordered laser head: AUD $70 (inc. GST)
* https://www.aliexpress.com/store/product/E-Series-CO2-Laser-Head-Focusing-Lens-D20mm-FL50-8-63-5-101-6-Mirror-25mm/1513187_32948855114.html
* ETA 2019-01-02
* 2018-12-14 Blake: ordered operations panel: USD $45.60 + shipping
* https://www.ebay.com/itm/Laser-Engraving-Cut-Leetro-Operation-Panel-PAD03-E-CO2-Laser-Controller-System/291953450952
* ETA 2019-01-22
* Spare HV PSU? USD$200--$450?
* Beam combiner+lens? USD$30?
Nick.
--
Nick Bannon | "I made this letter longer than usual because
nick...@rcpt.to | I lack the time to make it shorter." - Pascal
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