Ammeter box only, can there be too many?

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fred ungewitter
Posts: 355
Joined: Tue Aug 16, 2016 2:55 pm
Location: East Central FL, USA
Country: USA
Nickname: fred
Laser Machine Make or Type: Redsail Clone
Laser Power: 60W
Laser Bed Size: 500 x 700
Home Position: TR
RDWorks Version: 8.01.18
Accessories: Chuck style rotary, 30 ma meter, home-spun office water cooler mod, muffin fan anti-condensate blower
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Ammeter box only, can there be too many?

Post by fred ungewitter » Sun Sep 04, 2016 5:23 pm

Not having as much time as I'd like to begin building things with my laser, I have to stick with what works for me now. I've been stuffing my alleged mind with as much information as I can, and part of that information indicates that an ammeter is an important item to have for one's laser health.

I didn't want to chop big holes in my machine, so an external box was indicated, leaving only a single hole for the wiring.

The photos have a Horrible Freight flashlight in the photo for scale, but that may be redundant considering the typical meter size.
IMG_1071.JPG (2.11 MiB) Viewed 302 times
3D printed on a BCN3D Sigma, 0.200 mm layer height, 10 percent infill, five hours.
IMG_1073.JPG (2.08 MiB) Viewed 302 times
Not visible in this photo are the holes for the meter mounting. The main cut-out and meter mount holes aligned perfectly on the first attempt. I'm using OpenSCAD for my model creation, probably the 3D modeling software with the least difficult learning curve, but that's my opinion, not a solid fact.
IMG_1077.JPG (2.06 MiB) Viewed 302 times
I didn't want to cut a hole in the machine and run wires through without protection, so I hit the Thingiverse world and found a convenient grommet model. I can't print it today as I have a contract print running, but it's certain to get done tomorrow. I have already tested the polarity of the meter and matched it to the laser. At 10 percent power, the meter reads 2.0 milliamperes. I realize now I'm lucky to not have burned out the meter. I connected it as a test to the laser dot leads at the nozzle, but had no load in place. Dead short for a fraction of a second. Sheesh.

If you want to print your own, you can find it here, once the publish command goes through:
Please note that I'm not a programmer and the code will reflect that. I have commented it extensively and the necessary parameters will be clear, should any adjustments be required. Also note that I'm printing with an uncalibrated printer. I tend to adjust the OpenSCAD code to get the necessary fit, rather than adjust the printer as I should. This means that someone else's printer may generate a model that won't fit the meter. To prevent this with my model, I sliced away most of the box and left behind the panel with the holes as a 2mm thick template. If someone plans to 3D print one, I'd suggest doing the same. Having the source code means anyone can adjust it to make it work.

Redsail clone 60w 700 x 500 REAL 60w Puri tube
home upper right, chuck type rotary 15000 pulse setting
RDW 8.01.18

Emblaser A3 4w diode laser
BCN3D Sigma Dual Extruder 3d printer
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Cube 3rd gen 3d printer, universal filament mod
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Gene Uselman
Posts: 1313
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: QC1390
Laser Power: 130W EFR
Laser Bed Size: 36x49
Home Position: TR
RDWorks Version: V8.01.19 LO
Accessories: I have a combining lens, pin tables [homebuilt], honeycomb table [LightObject], wireless remote on the way [crossed fingers]
Windows Version: Win 7 Pro

Re: Ammeter box only, can there be too many?

Post by Gene Uselman » Mon Sep 05, 2016 7:30 am

Nice job- for those of us without 3D printers, this could easily be cut in pieces on your laser and glued up- and with the angles it would be a good design challenge. I am tempted to design one right now, just for practice, and then redesign it as I think Russ (a design eng.) would. Gene

I have been thinking about a 3D printer for years, but they are kinda slow, and I am kinda old. :D

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