Go Back   RCCrawler Forums > RCCrawler General Tech > Electronics
Loading

Notices

Thread: Dynos that actually measure torque?

Reply
 
LinkBack Thread Tools Display Modes
Old 08-22-2013, 11:44 AM   #1
I wanna be Dave
 
Join Date: May 2007
Location: Fairfield ME
Posts: 3,886
Default Dynos that actually measure torque?

What dynos have been made that actually measure toque? It seems most motor checking equipment (even those that call themselves a dyno) only measure things like amp draw, rpm, and the like.

I believe the tekin dyno like that pictured below measures torque but are there others?

Calderwood is offline   Reply With Quote
Sponsored Links
Old 08-22-2013, 02:19 PM   #2
I wanna be Dave
 
Join Date: Apr 2007
Location: Arlington, Washington
Posts: 2,303
Default Re: Dynos that actually measure torque?

It's a load dyno...the tekin wasn't very good, but some people could tune with it.

A dyno that measures torque needs a torque sensor. Very few had em, mainly the turbo dyno...all the others just use complex formulas to determine the torque using the things they can measure (rpm,amp draw, etc).

The turbo dyno isn't perfect though, most 30t and higher motors can trip the torque sensor max with ease.

Later EddieO
EddieO is offline   Reply With Quote
Old 08-22-2013, 04:15 PM   #3
Rock Crawler
 
Join Date: May 2008
Location: At the corner of Bedlam and Squalor.
Posts: 712
Default Dynos that actually measure torque?

There is the Fantom Dyno Facts Machine, but they're hard to come by and generally expensive when you find them.
monkeyracing is offline   Reply With Quote
Old 08-22-2013, 05:31 PM   #4
I wanna be Dave
 
Join Date: Apr 2007
Location: Arlington, Washington
Posts: 2,303
Default Re: Dynos that actually measure torque?

Fantoms are easy to find. You can typically find them on eBay for $100 or less, hobbytalk and rctech pften see them for around $100 every so often. Fantom made a lot of them, so there plenty out there to be had. It's a flywheel style dyno So the torque is measured by formulas not by a sensor.

Later EddieO
EddieO is offline   Reply With Quote
Old 08-22-2013, 06:03 PM   #5
MODERATOR™
 
EeePee's Avatar
 
Join Date: Jul 2004
Location: Ohio
Posts: 18,928
Default Re: Dynos that actually measure torque?

Hmmm, I haven't fired up TEDROCKZ's Turbo Dyno in a while. Fun stuff. Sounds cool. But yeah all my 35 turns hit the max of 15.9
EeePee is offline   Reply With Quote
Old 08-22-2013, 06:16 PM   #6
I wanna be Dave
 
Join Date: May 2007
Location: Fairfield ME
Posts: 3,886
Default

So what's the best dyno for crawler motors?
Calderwood is offline   Reply With Quote
Old 08-22-2013, 06:29 PM   #7
I wanna be Dave
 
Join Date: Apr 2007
Location: Arlington, Washington
Posts: 2,303
Default Re: Dynos that actually measure torque?

Your truck

I use a combo of all of them to test what I need.

I've been working on a custom unit but finding machinist time to get parts made isn't easy.
Later EddieO
EddieO is offline   Reply With Quote
Old 08-22-2013, 06:54 PM   #8
Rock Crawler
 
Join Date: May 2008
Location: At the corner of Bedlam and Squalor.
Posts: 712
Default

I had no idea Fantoms were so common. Last time I looked, they were much less so. It's been quite a while.
monkeyracing is offline   Reply With Quote
Old 08-22-2013, 08:34 PM   #9
I wanna be Dave
 
Join Date: May 2007
Location: Fairfield ME
Posts: 3,886
Default Re: Dynos that actually measure torque?

Quote:
Originally Posted by EddieO View Post
Your truck

I use a combo of all of them to test what I need.

I've been working on a custom unit but finding machinist time to get parts made isn't easy.
Later EddieO
Sadly, my truck doesn't have a printer port.
Calderwood is offline   Reply With Quote
Old 08-22-2013, 08:40 PM   #10
MODERATOR™
 
EeePee's Avatar
 
Join Date: Jul 2004
Location: Ohio
Posts: 18,928
Default Re: Dynos that actually measure torque?

Blah. Drive the thing. Can't tell? Isn't better. Eventually you come across something that is best. Like the Axle Buster in my Losi. Ridiculously better than anything else brushed in the thing. Better for your application? Not necessarily.
EeePee is offline   Reply With Quote
Old 08-22-2013, 09:33 PM   #11
RCC Addict
 
Join Date: Mar 2007
Location: Turn the mayflower around.. it will never work
Posts: 1,588
Default Re: Dynos that actually measure torque?

Strap to full size mustang dyno
JokersWild is offline   Reply With Quote
Old 08-22-2013, 10:17 PM   #12
I wanna be Dave
 
Join Date: Apr 2007
Location: Arlington, Washington
Posts: 2,303
Default Re: Dynos that actually measure torque?

What do you need a printer port?

But there is a way to dyno in the truck and print it....

Later EddieO
EddieO is offline   Reply With Quote
Old 08-22-2013, 10:29 PM   #13
I wanna be Dave
 
Join Date: May 2007
Location: Fairfield ME
Posts: 3,886
Default Re: Dynos that actually measure torque?

Quote:
Originally Posted by EeePee View Post
Blah. Drive the thing. Can't tell? Isn't better. Eventually you come across something that is best. Like the Axle Buster in my Losi. Ridiculously better than anything else brushed in the thing. Better for your application? Not necessarily.
Customers might like to have something more than "it's awesome, trust me!"

Quote:
Originally Posted by EddieO View Post
But there is a way to dyno in the truck and print it....

Later EddieO
Chassis dyno? Data logger?
Calderwood is offline   Reply With Quote
Old 08-22-2013, 11:16 PM   #14
I wanna be Dave
 
Join Date: Apr 2007
Location: Arlington, Washington
Posts: 2,303
Default Re: Dynos that actually measure torque?

I have not sent out a dyno sheet with a crawler motor since 2008....

A data logger would function as a in truck dyno pretty much....

Later EddieO
EddieO is offline   Reply With Quote
Old 08-22-2013, 11:35 PM   #15
I wanna be Dave
 
Join Date: May 2007
Location: Fairfield ME
Posts: 3,886
Default Re: Dynos that actually measure torque?

Quote:
Originally Posted by EddieO View Post
I have not sent out a dyno sheet with a crawler motor since 2008....

A data logger would function as a in truck dyno pretty much....

Later EddieO
Maybe the data logger is the best way for me to go. I have wanted an Eagle Tree for a while anyway for my planes. I could build a jig to hold a motor with a brake/flywheel for out of the truck testing besides being able to use it in the truck.
Calderwood is offline   Reply With Quote
Old 08-23-2013, 12:41 AM   #16
I wanna be Dave
 
Join Date: Apr 2007
Location: Arlington, Washington
Posts: 2,303
Default Re: Dynos that actually measure torque?

You'll find that even if you provide the data, most either don't care or don't know what it means. On top of that, you will find that the things people really wanna know like start up and drag brake are not really measurable without making up some test that again very few people would understand and would have no comparison from other brands of motors.

Later EddieO
EddieO is offline   Reply With Quote
Old 08-23-2013, 12:44 AM   #17
RCC Addict
 
Join Date: Jan 2012
Location: Sweden
Posts: 1,809
Default Re: Dynos that actually measure torque?

It should be no sweat to make a dyno to measure static torque (only).
- Something like a servo arm fitted on the motor axle.
- Some scale or similar to measure the force applied by that arm at a know distance from the axle centre.
- A voltmeter.
- An amperemeter.
- A regulated power feed.

This way the stall torque can be measured, as well as the no load voltage and current.
Any other torque value can be intrapolated from there.
Olle P is offline   Reply With Quote
Old 08-23-2013, 06:33 AM   #18
I wanna be Dave
 
Join Date: May 2007
Location: Fairfield ME
Posts: 3,886
Default Re: Dynos that actually measure torque?

Quote:
Originally Posted by EddieO View Post
You'll find that even if you provide the data, most either don't care or don't know what it means. On top of that, you will find that the things people really wanna know like start up and drag brake are not really measurable without making up some test that again very few people would understand and would have no comparison from other brands of motors.

Later EddieO
There is more to it than providing customers with data I guess. As I make revisions to my design I see it being very helpful to have comparative evidence. If one revision is only slightly better it might not be obvious which revision is better or it might not be obvious to me that although two revisions feel the same one might use more wattage to accomplish the same performance. I want to make sure my customers are getting the best product I can possibly provide. I have a bunch of motors from various manufactures so comparative data would be possible there as well. In addition to my products my wife wants to start winding armatures so she will want data to help her hone her technique.
Calderwood is offline   Reply With Quote
Old 08-23-2013, 07:23 AM   #19
owner, Holmes Hobbies LLC
 
JohnRobHolmes's Avatar
 
Join Date: Nov 2004
Location: Volt up! Gear down!
Posts: 20,290
Default Re: Dynos that actually measure torque?

If you are feeling froggy, I have a full dyno brain with display available. You would need a load cell with op amp, power supply, two ESCs, and a slave motor. It can be ran in voltage or amperage mode, amp limit is 100 , voltage limit is 150.


Your wife is in far a long journey! Winding is the most difficult part to jump into, it takes more practice than all the rest. I only wind 20 to 30 a week myself and its barely enough to keep the skills sharp.
JohnRobHolmes is offline   Reply With Quote
Old 08-23-2013, 08:39 AM   #20
I wanna be Dave
 
Join Date: May 2007
Location: Fairfield ME
Posts: 3,886
Default Re: Dynos that actually measure torque?

Quote:
Originally Posted by JohnRobHolmes View Post
If you are feeling froggy, I have a full dyno brain with display available. You would need a load cell with op amp, power supply, two ESCs, and a slave motor. It can be ran in voltage or amperage mode, amp limit is 100 , voltage limit is 150.


Your wife is in far a long journey! Winding is the most difficult part to jump into, it takes more practice than all the rest. I only wind 20 to 30 a week myself and its barely enough to keep the skills sharp.
John,
I just replied to your last email and added some questions about the dyno. Thanks again for all the help.

My wife seems really excited about winding and I believe she will be fairly good at it after a while. Certainly better than I would ever be. I'll keep doing cad work/machining and let her do that stuff!
Calderwood is offline   Reply With Quote
Reply



Dynos that actually measure torque? - Similar Threads
Thread Thread Starter Forum Replies Last Post
So how do you measure torque? Talico Electronics 13 02-11-2012 12:16 PM
can someone measure their 1.9 rovers bikerj08 Losi Mini-Rock Crawler 2 12-01-2010 09:39 PM
how do you measure shocks TomEGunn General Crawlers 1 10-20-2009 01:22 AM
How do you measure wheelbase??? 4drmopar General Crawlers 9 08-14-2009 04:32 PM
How to measure WB FELIX Newbie General 5 12-31-2006 01:52 PM
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 06:31 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com