Search found 2264 matches

by bigmoose
Jul 13 2019 7:56am
Forum: Battery Technology
Topic: Warning for those who bulk charge using bench power supply
Replies: 9
Views: 689

Re: Warning for those who bulk charge using bench power supply

jonyjoe your solution is a good one, and something I was going to mention. In the aerospace sector (where I spent my career) we always did FMECA (Failure Modes Effects and Critically Analysis) and used concepts of single failure tolerant and two failure tolerant to protect life threatening critical ...
by bigmoose
Jul 08 2019 5:58pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 174
Views: 9981

Re: Serious FOCer (84V VESC 6 based controller)

As mentioned above, don't underestimate the post sales support required. It can eat you alive. Then when you are overwhelmed, folks will start complaining about no timely response. May I recommend that you set up a Message Board for your company. Have it up and running before sales start. Point peop...
by bigmoose
Jul 07 2019 7:49am
Forum: General Discussion
Topic: The 2 types of type 2 diabetes explained and how to reverse - page 3 and scientific studies prove it!
Replies: 69
Views: 2480

Re: Americans have the most expensive urine in the world!

Early on the thread spoke of vitamin supplements. Thought I would share my journey over the winter with a kidney and 8 bladder stones... About two years ago, I thought I would start taking vitamin C regularly. A good antioxidant and supposedly helps prevent colds and such. A older (75 years) friend ...
by bigmoose
Jul 01 2019 8:50am
Forum: E-Bike Technical
Topic: Schaeffer grease alternative?
Replies: 2
Views: 189

Re: Schaeffer grease alternative?

The key ingredient you are looking for is a grease containing Molybdenum disulfide, or "moly". Some alternatives: (your recommended grease was a NLGI 1 a thinner version. It is a bit harder to find than the thicker NLGI 2. The thinner grease is better with gears as it tends to flow back into the cre...
by bigmoose
Jun 26 2019 3:04pm
Forum: E-Bike Technical
Topic: Need help identifying connector/terminal manufacturer and series
Replies: 5
Views: 268

Re: Need help identifying connector/terminal manufacturer and series

Thanks fecthter, I found out the connector is off a Koyo designed power steering unit, so perhaps it is a Japanese sourced connector and GM had to pick up what Koyo sourced. Weird. epowersteering found the source as they offer the connector with two crimp terminals for $5 bucks. If you can believe i...
by bigmoose
Jun 26 2019 10:55am
Forum: E-Bike Technical
Topic: Need help identifying connector/terminal manufacturer and series
Replies: 5
Views: 268

Re: Need help identifying connector/terminal manufacturer and series

Thanks gents, yes, I got the pix from epower steering. If GM uses these connectors with a 50 amp fuse in a safety critical function (steering) there must be something good in the design.

I couldn't find a manufacturer match. Strange for GM connector...
by bigmoose
Jun 24 2019 6:34pm
Forum: E-Bike Technical
Topic: Need help identifying connector/terminal manufacturer and series
Replies: 5
Views: 268

Need help identifying connector/terminal manufacturer and series

I ran across a picture of this connector series. It is being used commercially for 50 to 75 amps continuous. The spade connectors are about 10 mm wide. I spent about 4 hours today trying to find it... with no luck. I found a picture of the terminals in a china site, but no match to anything "real" o...
by bigmoose
Jun 07 2019 5:59pm
Forum: Technical Reference Area
Topic: Using EV Chargers
Replies: 95
Views: 4640

Re: Using EV Chargers

These are the threads I wait to savor!

However, wish it didn't say "has 128 bit AES encryption" ... hope they didn't encrypt the data stream...
by bigmoose
May 22 2019 10:27pm
Forum: Battery Technology
Topic: controlling meanwell with relay on 120VAC side - relays keep getting stuck closed!
Replies: 21
Views: 621

Re: controlling meanwell with relay on 120VAC side - relays keep getting stuck closed!

It's inrush. If you want to stay mechanical, I have used these definite purpose contactors from Automation Direct. Not too bad for imports and the price is pretty good. https://www.automationdirect.com/adc/sh ... contactors
by bigmoose
May 14 2019 8:49am
Forum: General Discussion
Topic: Tesla switches to permanent magnet reluctance motors and sees range gains
Replies: 19
Views: 1492

Re: Tesla switches to permanent magnet reluctance motors and sees range gains

Pure genius the SRPM architecture. Great efficiency gain when a large portion of use is at part load. Saves on rare earth materials. The person who thought of this marriage of technologies has paved the way forward with a giant step. Thanks for the insight on losses Luke.
by bigmoose
Mar 20 2019 12:29pm
Forum: General Discussion
Topic: Boeing 737 Max 8 failures..an explanation ?
Replies: 46
Views: 2408

Re: Boeing 737 Max 8 failures..an explanation ?

Thanks Bill! Great write up and great information!
by bigmoose
Mar 20 2019 11:04am
Forum: General Discussion
Topic: Boeing 737 Max 8 failures..an explanation ?
Replies: 46
Views: 2408

Re: Boeing 737 Max 8 failures..an explanation ?

Since there are knowledgeable pilots on this thread, let me ask this question: Early on, they stated how the 737 max engines could provide "lift." Well to me that was happening because they possibly installed the new engines with a positive tilt upwards, that bought more clearance for the nacelle wi...
by bigmoose
Mar 18 2019 1:50pm
Forum: General Discussion
Topic: Boeing 737 Max 8 failures..an explanation ?
Replies: 46
Views: 2408

Re: Boeing 737 Max 8 failures..an explanation ?

Good write up quoted by the OP. Looks pretty consistent with all I've read to date in a condensed form.

This gent is pretty good with facts. He flies right seat in 777 and is about the facts, not emotional diatribe. A good reporter. https://www.youtube.com/user/blancolirio/videos
by bigmoose
Feb 07 2019 7:11pm
Forum: Forum Rules and Features
Topic: The future of our forum - facebook versus web forums
Replies: 65
Views: 7308

Re: The future of our forum - facebook versus web forums

First, wondering what Justin's thoughts are? Second, not a supporter of FB. More and more of it's security flaws are going to be exposed, and I think it is near the top of its curve right now. Third, a conservative, planned migration to the next generation message board engine may be a consideration...
by bigmoose
Feb 01 2019 9:18pm
Forum: General Discussion
Topic: This man may change the world Andrea Rossi & eCat
Replies: 358
Views: 30741

Re: This man may change the world Andrea Rossi & eCat

... I can't figure out what his endgame is. His approach doesn't really make sense if the goal is to monetize a scam invention. Unless he really does think it works; he may be able to delude himself sufficiently to keep that belief alive. Very possible a small group of ol' guys with a little dement...
by bigmoose
Feb 01 2019 3:59pm
Forum: Items for Sale - Used
Topic: SOLD - F.W. Bell Model 9640 Hall Effect Gaussmeter with STB4-0404 probe TESTED
Replies: 1
Views: 321

Re: F.W. Bell Model 9640 Hall Effect Gaussmeter with STB4-0404 probe TESTED

An update on this one too. You can't find a better magnetometer, but It appears it was too pricey. Now willing to sell at a loss at $899 plus UPS shipping. It is still up on the auction site we all know and love. Meter and probe are calibrated and ready to rock and roll.
by bigmoose
Feb 01 2019 3:56pm
Forum: Items for Sale - Used
Topic: SOLD--ACDC Electronic Model EL-750 Electronic LOAD BANK TESTED
Replies: 1
Views: 374

Re: ACDC Electronic Model EL-750 Electronic LOAD BANK TESTED

I'm going to throw up an update on these. I have sold two of them for $279 and only have one left. If anyone in the USA is interested, will sell for $279 plus UPS shipping costs. If you want to make an offer do so. These are rock solid 750 watt all day electronic loads.
by bigmoose
Feb 01 2019 3:49pm
Forum: General Discussion
Topic: This man may change the world Andrea Rossi & eCat
Replies: 358
Views: 30741

Re: This man may change the world Andrea Rossi & eCat

Amazing as it may seem, Rossi is still at it and still getting money from investors. Yep I watched it all and couldn't believe it. The echo from a perhaps empty garage, and perhaps three people on chairs and a bare concrete floor (because of the echo). He kept talking about the "dancing ballerina" ...
by bigmoose
Jan 28 2019 9:19am
Forum: General Discussion
Topic: Magnify Glass vs Jewelry Microscope Magnifier Loupe
Replies: 14
Views: 1056

Re: Magnify Glass vs Jewelry Microscope Magnifier Loupe

I have three headbands with the flip down lenses in 1.5 2.5 and 3.5 power. For surface mount PCB work a stereo microscope with Barlow lens. ... and LOTS of light. It seems I am adding lighting above my bench with every 5 years of age.
by bigmoose
Jan 23 2019 8:02am
Forum: E-Bike Technical
Topic: I broke a bolt in my hub motor. How do I get it out?
Replies: 14
Views: 800

Re: I broke a bolt in my hub motor. How do I get it out?

Here is what I do for broken screws/bolts on really expensive things. It takes a mill (Bridgeport) however, but you may be able to adapt. Lock the part down on the table with fixturing. Take an end cutting end mill and make the top of the broken screw perfectly flat Use a center drill and your skill...
by bigmoose
Jan 20 2019 7:24pm
Forum: E-Bike Technical
Topic: How Many Amps 2 Pole Speakon Socket handle?
Replies: 9
Views: 441

Re: How Many Amps 2 Pole Speakon Socket handle?

Thank you for all the info, going with all the info I am going to ask ddk on his thread to get more accurate info, as I have doubts the 2 pole can handle 30A :shock: ... Note the specified 3mOhm contact resistance. At 30 amps that 2.7 watt dissipation per contact, or 5.4 watts per 2 pole connector....
by bigmoose
Dec 12 2018 8:35pm
Forum: Large EV General Discussion
Topic: What’s stopping Ford and GM from building compelling EV’s?
Replies: 19
Views: 1823

Re: What’s stopping Ford and GM from building compelling EV’s?

Always an pleasure and honor to see you Bigmoose. Most of the decision maker position folks at these companies are ICE/Hybrid legacy mindset folks who viewed EVs as the burdensome and financially costly compliance requirement to sell their gas cars into California. If you have two boats, you might ...
by bigmoose
Dec 12 2018 10:31am
Forum: Large EV General Discussion
Topic: What’s stopping Ford and GM from building compelling EV’s?
Replies: 19
Views: 1823

Re: What’s stopping Ford and GM from building compelling EV’s?

Its not about vision but about Return On Investment. The european market and mindset is very different than the USA. Its all about the distances and population density. I'm a rural guy in the USA. Always have been, and Lord willing, always will be. I live where there is 3 months of that white stuff ...
by bigmoose
Dec 12 2018 10:22am
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 78
Views: 6890

Re: Sensorless at standstill, development updates and status

Lebowski great tech! You deserve the :wizzard: label for sure! I would recommend you form a company. Make your technology the company's IP. Then approach the big guns of TI. This is a chip level solution with associated algorithms. If TI bites, they will buy out your company for the IP. Typical tech...