3d printed bevel gear-strength tests

Looking to make some 90deg gear trains, and wanted to know how much force 3d printed heard could resist.
After printing some gears, a holding block and some shafts, the testing began.

First few tries, the shaft to gear attachment kept falling. It was failing around 44 in.lbs of torque yet the gear teeth remained intact.

After redesigning the shaft to gear attachment, I was able to break some teeth at around 57 in.lbs of torque.

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Network storage and backup

I lost a HD the other day and whatever data was on it. I think I had most things backued up but there was still some data that is gone forever. This got me thinking about how to better protect ALL devices in my house.

Storage is cheap, but I don’t want 2 HD in every machine. And some machines like the laptops can’t use 2 HDs.

At the same time I need to re-evaluate the NAS solution in my house. I’m currently managing two systems. An UnRaid computer for archival storage and a Nas4Free machine for a faster access of data.

Steps:

1. Add an SSD drive to UnRaid as a cache drive to speed up write functions on the UnRaid system, and compare network read/write speeds with the Nas4Free box. See how different the two really are.

2a. If speeds are very close, take apart the Nas4Free array and move the two 2TB drives to the UnRaid system.

2b. If speeds are not close buy two 2TB drives and replace the two 1TB drives in the UnRaid system. This will increase the array capacity by 2TB.

3. For all computers set up some software that will backup the working files of all computers to a backup folder on the UnRaid system. Have this backup be done once a day (probably at night). A scheduled rsync operation (that also mirrors deleted files) should suffice. I don’t want an ever growing amount of data. Just a mirror copy of the machine’s HD in case it fails.

Blood glucose meter research

Looking for a blood glucose meter.
Best 10 glucometers as lsorted by Men’s health
http://www.menshealth.com/spotlight/diabetes/top-blood-glucose-meters.php
It looks like not all blood sugar meters are equally accurate. List of a bunch of meters on this page.
http://www.diabetesdaily.com/voices/2013/07/blood-glucose-meter-accuracy-comparison-chart/
Same data sorted by total accuracy from lowest to highest (total accuracy = the sum of all the entries for each unit)
(table at the bottom of post)

Some recommendations for the Accu-Chek Active since it’s accurate and test strips are least expensive.
Excellent article on the technical challenges of getting accurate readings from glucometers:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2769957/

Meter Within 15% Within 10% Within 5% Within 15% Within 10% Within 5%
Under 100 mg Under 100 mg Under 100 mg Over 100 mg Over 100 mg Over 100 mg
SeniorLine GM210 15% 0% 0% 79% 55% 29%
Glucohexal II 50% 21% 7% 80% 64% 32%
GlucoRx (TD-4230) 83% 41% 14% 65% 40% 14%
Wellion CALLA Light 68% 33% 13% 89% 73% 52%
GlucoSmart Swing 84% 53% 15% 94% 67% 33%
Futura Monometer 90% 68% 27% 79% 59% 26%
IME-DC Fidelity 72% 43% 18% 94% 85% 48%
Biocheck TD-4225 76% 52% 22% 97% 80% 49%
Element 90% 79% 48% 83% 64% 30%
GlucoTel 89% 70% 33% 92% 72% 41%
Bayer Contour usb 90% 69% 45% 91% 68% 34%
smartLAB genie 84% 52% 23% 98% 87% 57%
iDia 96% 80% 47% 90% 71% 40%
GlucoCheck Classic 97% 84% 55% 85% 66% 38%
Beurer GL32 85% 62% 40% 99% 91% 56%
iBGStar 96% 90% 52% 90% 72% 35%
WaveSense Jazz 100% 75% 38% 95% 80% 47%
GlucoCheck XL 97% 92% 58% 88% 65% 40%
Pura 100% 95% 48% 100% 74% 30%
GlucoCheck Comfort 96% 86% 56% 95% 74% 41%
iXell OLED 97% 85% 52% 97% 79% 39%
smartLAB global 91% 85% 57% 93% 79% 48%
Beurer GL40 98% 90% 52% 95% 78% 42%
Omnitest 3 94% 86% 64% 91% 79% 48%
iXell 100% 98% 68% 89% 75% 38%
OneTouch Verio 97% 78% 40% 100% 95% 64%
microdot+ 98% 95% 62% 94% 83% 43%
Accu-Chek Compact Plus 100% 86% 27% 100% 94% 69%
Gluco-test Plus+ TD-4230 96% 94% 76% 95% 79% 42%
OneTouch VITA 98% 93% 72% 99% 87% 50%
BGStar 98% 92% 80% 97% 87% 62%
Accu-Chek Performa 100% 95% 72% 99% 94% 68%
Accu-Chek Mobile (maltose independent) 100% 98% 71% 100% 94% 66%
Accu-Chek Performa 98% 97% 78% 98% 92% 66%
Accu-Chek Aviva 100% 97% 80% 99% 91% 64%
Accu-Chek Mobile (maltose dependent) 98% 98% 73% 100% 96% 66%
Accu-Chek Nano 100% 96% 80% 99% 95% 65%
Accu-Chek Performa Nano 100% 98% 87% 100% 96% 64%
Accu-Chek Active 100% 100% 72% 100% 100% 79%
Accu-Chek Go 100% 100% 94% 100% 96% 79%
FreeStyle Lite 100% 100% 93% 100% 100% 86%
FreeStyle Freedom Lite 100% 100% 98% 100% 98% 90%

 

Variable Pitch Quad rotor cont’d

I got searching the other night for ideas on bulding a VP quad again.

One of the issues i had last time was finding a decent pitch slider mechanism. Well I found a few reasonably priced:
http://www.flying-hobby.com/kde-direct-align-trex-500-series-performance-tail-control-p-9740.html
http://www.flying-hobby.com/500esp-metal-tail-pitch-assembly-p-10400.html
http://www.helipal.com/h50189-500metal-tail-pitch-assembly.html

It seems the align trex500 heli pitch slider p/n is either h50189 or H50190. Should find out what the difference between them is.