Jack Crossfire's blog View Details
Archive for October, 2021
Posted by Jack Crossfire | Oct 30, 2021 @ 06:56 PM | 18,162 Views
Every iteration of robo rudolf gets better & this year was definitely a big leap.

Orange PLA with a brown sharpie made a surprisingly realistic woodgrain texture. The lion kingdom couldn't afford to dunk it in wood stain. It was surprising to find brown sharpies still in existence, in a time when 31 flavors of ice cream are the enemy of equality.

It was designed in a time when 25 zip ties were $1. 3mm zip ties aren't even made anymore. A better design would use bolts. The new nose mount could use a lot of changes to make it easier to screw in the clamps & use string instead of zip ties....Continue Reading
Posted by Jack Crossfire | Oct 27, 2021 @ 02:36 PM | 17,582 Views
While hacking 60W lightbulbs is a cheap way to get bright white light, 100W RGB lightbulbs are absolutely a waste of money for making colored light. The rated brightness on these is for white light only. The colored light is a different mode & uses a small number of dimmer RGB leds on 13V. The white LEDs run on 140V & can't be ground down to run on 12V. The 2 sets of LEDs aren't used simultaneously. The cheapest way to get colored light is the good old snail mailed COB.

https://www.amazon.com/Chanzon-Inten...01DBZJZ7E?th=1...Continue Reading
Posted by Jack Crossfire | Oct 23, 2021 @ 10:33 PM | 26,665 Views
After an unfortunate toe injury, the decision was made to install a very bright, removable light to try to improve the visibility of the path. A 60W LED bulb was converted to 8.2V 200mA. Then a heat resistant mount was printed out of PETG. The prolific jump in zip tie prices has led to string.

It was hard to make any conclusions in a parking lot. That was the last of the dry weather for 36 hours. The mane problem is without a reflector, it's very diffuse.
Posted by Jack Crossfire | Oct 09, 2021 @ 03:21 PM | 26,431 Views
Epic DIY 3D Printed Planeprint Eagle Build (18 min 47 sec)

On the road to a pterodactyl glider, there appeared a 3D printed bald eagle. It involved an ABS motor mount. The lion kingdom wasn't happy about the servo lids being glued on, the glued TPU hinges, the TPU tensioners. TPU doesn't stretch like a rubber band & it doesn't stick to CA. There were a lot of good clamshells & techniques for a 3D printed pterodactyle. The mane obstacle continues to be renting enough space to store it.
Posted by Jack Crossfire | Sep 30, 2021 @ 10:02 PM | 16,470 Views
So 8.7 miles with the latest motor rewinding sucked a whopping 190mAh/mile. Solid core 26 AWG might actually be more efficient than quad 32 AWG. The best explanation lions have is the skin effect. In a high frequency PWM application, skin effect causes more resistance as wire diameter decreases. Laminated quad 32 AWG has 4 times more surface area than solid core 26 AWG, so the quad 32 AWG would have a lot more resistance than solid core 26 AWG. You'd think it would matter more for kilometers of wire & megahertz than a motor winding.

It's become clear that the motor encoder is getting knocked out of alignment & the reason probably isn't loose cables snagging it. Lacking any reason, the idea of farstening thermisters to the motors is gaining traction. In 1985, thermisters might have been available in every corner Radio Shack, but in the future they're a little hard to come by.

Today's repair work was a failure of the happy meal controller to charge anymore. It had salt water damage around the battery management chip, so the latest clamshell still isn't repelling water.