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

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…"
20 hours ago
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. "
22 hours ago
thomas Butler commented on mykita paskov's blog post Phoenard: World's first all-in-one prototyping gadget as your Drone Controller?
"I would not support this design."
23 hours ago
thomas Butler commented on mykita paskov's blog post Phoenard: World's first all-in-one prototyping gadget as your Drone Controller?
"To offer a product using nothing more that the standard in the community is just plain wrong. You should be using an STN32F4xx with hardware floating point, an Invensense MPU6050, an MS5611, HMC5883 ; these have become standard components for flight…"
23 hours ago
thomas Butler commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"The purpose of the post is to define what bearings designs are used and why those bearings are used in the current motors.....FYI bearings page two. What bearing does my  motor use? Measure it. a 4x8x4 is a 4mm bore by 8mm diameter by 4 mm…"
23 hours ago
Xin H commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"Magnetic bearing is still not quite common as the cost is high, we still only use mag bearing on expensive equipments mostly. The magnetic bearing you mentioned is not suitable for our application, as the long life is based on non-stop high speed…"
yesterday

Developer
Bill Bonney commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
">there are more [innovative] tech out there The link you have provided is patented technology, so the cost is probably prohibitive for benefits gained at the moment."
yesterday
OG commented on thomas Butler's blog post What bearings for my multi-rotor copter motor?
"hello this verry intresting post but all the barings you mention are old technology! there are more inavative tech out there but no one is doing any thing different there are frictionless bearings that will last life time of the motor. No one is…"
Saturday
thomas Butler posted a blog post

What bearings for my multi-rotor copter motor?

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 the axial load placed on the motor when it is used in an airplane. The only difference is orientation; i.e., airplane motor…See More
Friday
thomas Butler replied to Robert Merki's discussion Tell me what pains you about drones/UAVs. (VENT AT ME)
"A Flight Controller that works!"
Nov 17
thomas Butler replied to Robert Merki's discussion Tell me what pains you about drones/UAVs. (VENT AT ME)
"Do your home work and don't be lazy. "
Nov 17
thomas Butler replied to Robert Merki's discussion Tell me what pains you about drones/UAVs. (VENT AT ME)
"@Gary, Regarding the bearings used in multi-rotor copters; the motor manufacturers are using the correct bearings in their electric out-runner motors. They don't need to use thrust bearings. The axial load placed on the motor is no different…"
Nov 16
thomas Butler commented on Simon D. Levy's blog post GPS Kalman Filtering in PyQuadSim
"@Simon, as far as noise, I assume(I know it is wrong to assume) you mean multi-path reception which would occur regardless of the quality of the receiver. The expensive GPS device might have squelch circuitry to reduce multi-path reception. Maybe…"
Nov 14
thomas Butler commented on Simon D. Levy's blog post GPS Kalman Filtering in PyQuadSim
"Oh OK Phillip! I was thinking about it in the context of DIYDrones/APM/ArduCopter... It may have been done "a million times before", but as far as I know, it's not being done in the ArduCopter code. Perhaps not feasible with the…"
Nov 13
thomas Butler commented on Simon D. Levy's blog post GPS Kalman Filtering in PyQuadSim
"The interesting thing about technology is that if you have an idea, more than likely someone else has already tried it. Check this out smooth GPS data and Google "Kalman filter GPS module"....and this GPS unit with…"
Nov 13
thomas Butler commented on Simon D. Levy's blog post GPS Kalman Filtering in PyQuadSim
"Additionally, it would be good to know the amount of processing overhead involved with Kalman filtering the GPS signal. If it is insignificant, I would think the developers (especially APM) would already be using it. Might be too much for the…"
Nov 13

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 6 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…

Continue

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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