thomas Butler
  • Male
  • Rockford, IL
  • United States
Share Twitter

thomas Butler's Groups

thomas Butler's Discussions

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

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…"
yesterday
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…"
Wednesday
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?"
Wednesday
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…"
Tuesday
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.…"
Tuesday
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…"
Tuesday
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.…"
Monday
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…"
Sunday
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. "
Sunday
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."
Sunday
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…"
Sunday
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…"
Sunday
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…"
Saturday

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."
Saturday
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…"
Nov 21
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
Nov 21

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…

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…

Continue

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…

Continue

Comment Wall

  • No comments yet!

You need to be a member of DIY Drones to add comments!

Join DIY Drones

 
 
 

© 2014   Created by Chris Anderson.

Badges  |  Report an Issue  |  Terms of Service