8LikesTekin Servos
12-12-2017 | 01:44 PM
#47
Joined: Mar 2008
Posts: 5,717
From: At dirt tracks in Michigan!
I actually had to re-read tekins website, your statement of doesnt tell the whole story. Tekin's press blast say which is from 1 point to another, not each change in degree of .2 is a change in value. It makes no mention of the resolution, which is what i was trying to compare, to get an apples to apples comparison.
That's not what that means at all... It means if you command 30.0 degrees, it will be within 0.2. If you command 90.0 degrees, it will be within 0.2. If you command 180.0 degrees, it will be within 0.2.
So I'm going to stick to my original point, we know Savox is 1 change in value per .0488 degree of movement. I would be interested to see what Tekin's is.
I give up. That's not how it works. Knowing the servo is off by 0.0488 degrees doesn't mean it is capable of correcting that small of an angle. there is more play in the driveline than that. All servos have a set amount of deadband to prevent the servo from hyperventilating trying to match the input angle with the output. Put a super long (so it is easy to measure) and super rigid servo horn on a brand new Savox servo. Weld/glue/braze/epoxy the horn to the output shaft so there is no play. Bolt the servo to a table. Turn on the radio and then push against the servo servo horn one way. Measure the angle it sits at. Push it the other way. Measure that angle. The difference will not be .0488 degrees. It will be much larger.
To your point resolution vs accuracy, resolution allows us to be more accurate to a certain point and come on, we both know Tekin and savox have some kind of temperature correction factor built into the Micro controller. Hall effect sensors are sensitive to changes in temperature as well.
Wait, you demanded proof for my claims, but we both know there is a temp sensor in savox servos and a profile stored that perfectly compensates for temperature, age, cycles, and all the other factors that affect the accuracy of a potentiometer?
Temperature has no effect on the accuracy of a digital encoder (as long as it is within operational limits). It affects analog systems like potentiometers. Digital encoders of any sort (magnetic, light, etc) produce the same accuracy. That's the whole point to using them. They work by producing multiple pulses as the encoder rotates that the processor literally counts to tell where the encoder is oriented.
I will concede after re-reading your statement you didnt claim Tekin had better gears and better response time, however you mentioned it would effect price, which was specifically what I was asking about. You kinda lead people to think the increase price tag over something like a savox could be because of those things. Thats a little misleading, along the same lines of drinking commercials. "Drink our beer and cool people want you".
You asked how they could justify the cost. I listed possibilities that apply to all servos, not just Tekin. Then I listed things that are for sure better spec'd on the Tekin units. I'm not sure how else I could have worded it to avoid confusion.
Actually all of those features are already included in the servo, except the torque change on impact. That would be interesting to see in action, I would think some kind of accelometer and/or G-force meter would need to be used.
That's not what that means at all... It means if you command 30.0 degrees, it will be within 0.2. If you command 90.0 degrees, it will be within 0.2. If you command 180.0 degrees, it will be within 0.2.
So I'm going to stick to my original point, we know Savox is 1 change in value per .0488 degree of movement. I would be interested to see what Tekin's is.
I give up. That's not how it works. Knowing the servo is off by 0.0488 degrees doesn't mean it is capable of correcting that small of an angle. there is more play in the driveline than that. All servos have a set amount of deadband to prevent the servo from hyperventilating trying to match the input angle with the output. Put a super long (so it is easy to measure) and super rigid servo horn on a brand new Savox servo. Weld/glue/braze/epoxy the horn to the output shaft so there is no play. Bolt the servo to a table. Turn on the radio and then push against the servo servo horn one way. Measure the angle it sits at. Push it the other way. Measure that angle. The difference will not be .0488 degrees. It will be much larger.
To your point resolution vs accuracy, resolution allows us to be more accurate to a certain point and come on, we both know Tekin and savox have some kind of temperature correction factor built into the Micro controller. Hall effect sensors are sensitive to changes in temperature as well.
Wait, you demanded proof for my claims, but we both know there is a temp sensor in savox servos and a profile stored that perfectly compensates for temperature, age, cycles, and all the other factors that affect the accuracy of a potentiometer?
Temperature has no effect on the accuracy of a digital encoder (as long as it is within operational limits). It affects analog systems like potentiometers. Digital encoders of any sort (magnetic, light, etc) produce the same accuracy. That's the whole point to using them. They work by producing multiple pulses as the encoder rotates that the processor literally counts to tell where the encoder is oriented.
I will concede after re-reading your statement you didnt claim Tekin had better gears and better response time, however you mentioned it would effect price, which was specifically what I was asking about. You kinda lead people to think the increase price tag over something like a savox could be because of those things. Thats a little misleading, along the same lines of drinking commercials. "Drink our beer and cool people want you".
You asked how they could justify the cost. I listed possibilities that apply to all servos, not just Tekin. Then I listed things that are for sure better spec'd on the Tekin units. I'm not sure how else I could have worded it to avoid confusion.Actually all of those features are already included in the servo, except the torque change on impact. That would be interesting to see in action, I would think some kind of accelometer and/or G-force meter would need to be used.
Last edited by Krio; 12-12-2017 at 02:06 PM. Reason: done
12-12-2017 | 01:54 PM
#48
You guys are kids ruining this thread with all the back and forth. I understand the comparison but this thread isn’t about Savox servos.
My question is this, what is the Hotwire going to be able to do for the servo? What would be the reason to program a servo?
My question is this, what is the Hotwire going to be able to do for the servo? What would be the reason to program a servo?
12-12-2017 | 01:57 PM
#49
HOTWIRE™ PROGRAMMABLE FEATURES
Feel - Mild to Aggressive
Speed Limit
Torque (0-100%)
Torque Delay
Direction - Normal / Reverse
Center Point
Travel
Soft Starting Speed & Torque
Max Temp Alarm
Low Voltage Alarm
Over Voltage Alarm
Bind Relief
Fail Safe Speed and Position
Set Custom Servo Name
12-12-2017 | 02:06 PM
#50
Joined: Mar 2008
Posts: 5,717
From: At dirt tracks in Michigan!
Sorry about that. I get passionate about electronics and system dynamics.
12-12-2017 | 02:30 PM
#51
Wow you totaly miss understood what I meant by .0488. Thats not the margin of error. On a savox servo you have 4096 steps of resolution across 200 degrees of movement. So for every .0488 degree of movement the pot registers 1 change in position.
I was trying to compare that to what Tekin does, because you state Tekin's is superior.
thats cool, we can leave it there.
I was trying to compare that to what Tekin does, because you state Tekin's is superior.
thats cool, we can leave it there.
12-13-2017 | 08:21 AM
#54
I think the programmable torque is a cool feature, and I would guess it can be programmed for each direction? I.e. if it was a high torque brake / throttle servo, I would be able to use the minimum required torques for the brakes, and then dial it down for the Throttle as well.
How is the Max Temp monitored? will that be seen via telemetry, or internal then leading to a safe shutoff of the servo? Which can later be read via Hotwire / Windows?
Pretty neat.
How is the Max Temp monitored? will that be seen via telemetry, or internal then leading to a safe shutoff of the servo? Which can later be read via Hotwire / Windows?
Pretty neat.
12-13-2017 | 09:57 AM
#55
real classy
12-13-2017 | 10:03 AM
#56
I think the programmable torque is a cool feature, and I would guess it can be programmed for each direction? I.e. if it was a high torque brake / throttle servo, I would be able to use the minimum required torques for the brakes, and then dial it down for the Throttle as well.
How is the Max Temp monitored? will that be seen via telemetry, or internal then leading to a safe shutoff of the servo? Which can later be read via Hotwire / Windows?
Pretty neat.
How is the Max Temp monitored? will that be seen via telemetry, or internal then leading to a safe shutoff of the servo? Which can later be read via Hotwire / Windows?
Pretty neat.
Is the programmable torque meant to replace exponential in the case of brakes?
03-01-2018 | 08:50 PM
#58
05-05-2018 | 03:47 PM
#59
Tech Regular
iTrader: (1)
Joined: Apr 2014
Posts: 430
From: Orange County CA
I bought the servo, bought the Hotwire 2.0, jumped through the hoops to get the software working, and nothing. It won't connect. Rather anticlimactic. I was so excited. Hot Wire connects, and says "connect servo." It's connected. White stripe connected to white stripe. Any ideas?