thomas Butler
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  • Rockford, IL
  • United States
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quad crash because of corrupt PID value EEPROM...no CRC check of EEPROM/PID values ???!!!

Started this discussion. Last reply by thomas Butler Aug 31, 2013. 2 Replies

My quad crashes for some unexplicable reason.  The copter would bank right on takeoff; looking at the quad from the rear (viewed from the front this would be a bank to the left)  I hooked up Mission…Continue

 

thomas Butler's Page

Latest Activity

thomas Butler replied to George Sugden's discussion ADVICE on Roof surveying
"Been there done that! You might want to watch my video  inspecting a new roof job on my house. All of the copter details are in the comment section.  I used a Nikon s3100 (which can record in HD, but this video is not ), but I would have…"
Dec 16
thomas Butler commented on DynexHobby's blog post Multirotor vibration
"I think this is the first time I've seen a DIYDrones blog post with no responses in more than three days! I'm not surprised on this one, so I'll do the whining on this one!   The post is a soft sell for a "vibration"…"
Dec 14
thomas Butler commented on Visual Micro's blog post New - Microsoft Visual Studio 2013 Community Edition (free)
"OK well NOW it works, and it's a big improvement over using just the original Arduino IDE. Now I'm sold! This blog post is for the most part about building ArduPilot code using Atmel/Visual Studio and Visual Micro's add-on. The AP…"
Dec 8
thomas Butler commented on Visual Micro's blog post New - Microsoft Visual Studio 2013 Community Edition (free)
"@VisualMicro, It's because of the hokey way the Arduino IDE deals with the so called user "libraries" which are not actually libraries, but are instead shared source files.  The Arduino IDE scheme therefore makes the…"
Dec 7
thomas Butler commented on Visual Micro's blog post New - Microsoft Visual Studio 2013 Community Edition (free)
"It works! Crius All-In-One Compiling and Uploading MegaPirate (ArduCopter 3.1)  with Atmel Studio 6.1 using VisualMicro addon (probably should be a separate blog post). Build MegaPirate version 3.1.5r2 (at MegaPirateNG ) of ArduCopter…"
Dec 6
thomas Butler replied to Ankur Mohan's discussion Using the MPU6050 for Quadcopter Orientation Control
"Hey Ankur, I seriously doubt you really looked "long and hard"! Come on!  See this recent blog post on compiling in VisualStudio for ArduPilot which might open your eyes. As a friendly suggestion, you would be better off…"
Dec 4
thomas Butler commented on Visual Micro's blog post New - Microsoft Visual Studio 2013 Community Edition (free)
"Yawnnnnn!!! If there were a plugin for the STM32 which allowed building the ArduPilot code for STM32 based flight controllers, then this MIGHT be interesting, or for any STM32 based project!"
Dec 1
Jake Stew commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"That's kind of what I was wondering about. Has anybody actually flown long enough without crashing to say that the bearing life is too short? What I mean is that even a small crash could chip or dent a bearing or race, which would lead to early…"
Nov 27
thomas Butler commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"hey Jake, bearing failure in copters is a bit of a paradox. Hypothetically, my copter which is carrying $8,000 worth of camera gear should NEVER crash. It will run until it uses >bearing limit hours of flight time. Heat will cause the volatile…"
Nov 26
Jake Stew commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"Are people really running motors to bearing failure? Is it bearings wearing out or crash damage leading to excessive wear?"
Nov 26
Brent commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"Improvement in bearing life is the biggest advantage to having a lower thrust bearing. The quality of the bearings in most out runners is poor at best. They are not up to the task of constent axial loads. There are 4mm thrust bearings available from…"
Nov 25
thomas Butler commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"@Brent, I saw that post of johnaroma's mod to a DT750. A 100% improvement?   If that were truly the case, why wouldn't the motor manufacturers pick up on it.  The load requirement just doesn't justify a thrust bearing.…"
Nov 25
thomas Butler commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"While it's true full scale prop aircraft use thrust bearings, they add another level of complication to the motor. Some require variable pressure control applied to the bearings while running.  Tapered roller bearings; the proper pressure…"
Nov 24
Brent commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"Full scale A/C use fuse real thrust bearings. We can get by with deep grove bearings but the problem is if you look at the typical out runner bearing there is nothing deep groove about them. The balls are often running on the side retainer cover.…"
Nov 24
Glenn M commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"I'm trying to find some good quality, reasonably priced replacement bearings for my motors, but haven't had much luck so far. I'm after 694zz bearings which are 11x4x4mm. T-motor sells them for around $10 for two EZO bearings, but in…"
Nov 23
Jake Stew commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"Great post! There has been some people railing on that we need special motors for multirotor applications, and they don't seem to get that there is no difference from fixed wing applications. "
Nov 23

Profile Information

About Me:
software engineer
Please tell us a bit about your UAV interest
aerial photography
Hometown:
rockford, illinois

Thomas Butler's Blog

What bearings for my multi-rotor copter motor?

Posted on November 21, 2014 at 1:41pm 13 Comments

What bearings in copter motors?  The type of bearing is a “deep groove” ball bearing.  

 

The axial load (applied force is parallel to motor shaft) placed on the motor is no different than…

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Are you still "puffing" LiPos?

Posted on July 20, 2014 at 11:30am 11 Comments

This is a compendium of information on LiPos.  At this point in the UAV/multicopter game users should not be damaging their LiPos. That is just giving away money to the battery manufacturers. A few simple rules will help the LiPo last a long time. 

 

Please feel free to add or correct…

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Super simple and compact quadcopter power distribution module

Posted on November 28, 2013 at 7:00am 13 Comments

I'm amazed how complicated some of the designs are for the power distribution of a quadcopter so I made my own. 

To monitor current put the sensor between the power source and one ESC in order to get a value that can be multiplied to calculate…

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