Re: Slip Rings

[Daniel Angel]

Anyone using slip rings on their build?

D.Scott
--
Conquering the world one robot at a time....

[Bob Darlington]

Yeah, or at least I'm planning to. I bought the slip ring that was being sold in a group buy through the R2 club. It's something like 20 conductors and fairly small.
-Bob

On Sat, Oct 31, 2015 at 7:01 PM, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:

Anyone using slip rings on their build?

D.Scott
--
Conquering the world one robot at a time....

[Daniel Angel]

Think I saw the same posting. I'd like to eliminate my limit switches on the B9 and the Droid.
Thanks Bob,
D. Scott

On Sat, Oct 31, 2015 at 6:14 PM, Bob Darlington rdarlington@gmail.com [B9Builders] wrote:

Yeah, or at least I'm planning to. I bought the slip ring that was being sold in a group buy through the R2 club. It's something like 20 conductors and fairly small.
-Bob
On Sat, Oct 31, 2015 at 7:01 PM, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:

Anyone using slip rings on their build?

D.Scott
--
Conquering the world one robot at a time....

--
Conquering the world one robot at a time....

[toblueiis]

Hello Daniel,

what is your arrangement of limit switches? How many are you using and how many positions?

Just curious, but why are you wanting to do away with your limit switches?

thanks,

David

--------------------------------------------

On Sat, 10/31/15, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:

Subject: [B9Builders] Slip Rings
To: "B9Builders@yahoogroups.com"
Date: Saturday, October 31, 2015, 8:01 PM

Anyone using slip rings on their build?



D.Scott

--

Conquering the world one robot at a time....







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[Daniel Angel]

Hi David
I have two on my waist control and two in my radar section. One of the switches in the waist is giving me problems. I've changed it a second time but it still works sporadically. I wouldn't change the radar switches because there is no central opening. Just two positions for both systems to prevent wire tangling.
For my droid I want one for the dome.
I could do without them but I can't resist tinkering
D.Scott

On Sat, Oct 31, 2015 at 7:02 PM, toblueiis toblueiis@yahoo.com [B9Builders] wrote:

Hello Daniel,

what is your arrangement of limit switches? How many are you using and how many positions?

Just curious, but why are you wanting to do away with your limit switches?

thanks,

David

--------------------------------------------
On Sat, 10/31/15, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:

Subject: [B9Builders] Slip Rings
To: "B9Builders@yahoogroups.com"
Date: Saturday, October 31, 2015, 8:01 PM

Anyone using slip rings on their build?



D.Scott

--

Conquering the world one robot at a time....







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--
Conquering the world one robot at a time....

[toblueiis]

Hello Daniel,

I work with limit switches all the time on my job with the equipment we use. I am not totally sold on them as we sometimes have to reset their calibration, but they are still an acceptable option. When your limit switch "failed", was the issue that it had increased resistance on its' contacts? If so, you might could use a relay that is turned on by the limit switch and let the relay carry the bulk of current load. Is the use of the two switches, for "end of travel" and "front" position? Which position is having the switch trouble? Hope that you don't mind the questions, but it is an interesting problem that you are having, in that the same switch is going out, when both positions share the same parts.. I am a technician by trade and feel that every problem is a potential learning situation.

Daniel, I can't hardly imagine any of us could fault you for tinkering.
Isn't that normal???

thanks,
David
--------------------------------------------

On Sat, 10/31/15, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:

Subject: Re: [B9Builders] Slip Rings
To: "B9Builders@yahoogroups.com"
Date: Saturday, October 31, 2015, 9:31 PM



Hi David
I have two on my waist control and
two in my radar section. One of the switches in the waist is
giving me problems. I've changed it a second time but it
still works sporadically. I wouldn't change the radar
switches because there is no central opening. Just two
positions for both systems to prevent wire
tangling.
For my droid
I want one for the dome.
I could do without them but I
can't resist tinkering
D.Scott
On Sat, Oct 31, 2015 at
7:02 PM, toblueiis toblueiis@yahoo.com
[B9Builders]
wrote:

























Hello Daniel,



what is your arrangement of limit switches? How many are
you using and how many positions?



Just curious, but why are you wanting to do away with your
limit switches?



thanks,



David



--------------------------------------------

On Sat, 10/31/15, Daniel Angel danielscottangel@gmail.com
[B9Builders]
wrote:



Subject: [B9Builders] Slip Rings

To: "B9Builders@yahoogroups.com"


Date: Saturday, October 31, 2015, 8:01 PM



Anyone using slip rings on their build?







D.Scott



--



Conquering the world one robot at a time....















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--
Conquering the world one
robot at a time....











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[Gordon Smith]

I just saw a 24 conductor slip ring for sale at Electronic Goldmine for $10.
  From: "Bob Darlington rdarlington@gmail.com [B9Builders]"
To: B9 Robots Builders Club
Sent: Saturday, October 31, 2015 8:14 PM
Subject: Re: [B9Builders] Slip Rings

  Yeah, or at least I'm planning to.  I bought  the slip ring that was being sold in a group buy through the R2 club.  It's something like 20 conductors and fairly small.
-Bob
On Sat, Oct 31, 2015 at 7:01 PM, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:

  Anyone using slip rings on their build?

D.Scott
--
Conquering the world one robot at a time....

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[Mike Handley]

Me too, using it at the base of the CSS. Commoned  several pairs together to transport 24v to the torso, leaving the rest for signal lines.
Mike H

On Nov 1, 2015, at 9:14 AM, Bob Darlington rdarlington@gmail.com [B9Builders] wrote:

 
Yeah, or at least I'm planning to.  I bought  the slip ring that was being sold in a group buy through the R2 club.  It's something like 20 conductors and fairly small.
-Bob
On Sat, Oct 31, 2015 at 7:01 PM, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:
 
Anyone using slip rings on their build?

D.Scott
--
Conquering the world one robot at a time....

[David Schulpius]

I was wondering the same thing as David above. It's odd that the same switch has gone bad twice and in such a short time. Usually any type of switch is rated for tens of thousands of operations and should last for decades. Some factors that would limit the lifetime would be over current of the rated amperage, overheating the lugs when soldering or abuse (slamming into the switch too fast with the moving load). These stitched also can easily go out of calibration if not installed and set properly. For example with micro switches; if you install the switch and bend the actuator arm so the moving load will trigger the switch but the actuator arm has to bend a little to trigger the switch, over time the arm will bend so it won't trigger the switch anymore. I have limit switches installed also in both my waist and radar and they hardly ever get hit. They're just there to calibrate the end points in the control software and for a panic runaway situation. My control software (EZ Robot's EZ Builder that's sending speed and position commands to a Sabertooth 2X32 with a Kangaroo 2x daughterboard) knows where the endpoints (limit switches) are and will stop short of them (called Soft Limit points) even if I try to command a move past them.
Maybe we can help? If your willing I have a few questions; How are you using these switches? Are you using them as an end point identifier that needs to be hit every time to get the motion to go the other way? What type of switches are you using for your limit switches? How much amperage are you pulling through them and how many amps are they rated for? Do you have a few pictures of how you have them installed?
I'm also curious on your slip ring expectations. I know little about the types of slip rings out there. I at first wanted to use one in my build but was in too much of a hurry when I started my build to learn about them and take the time to find the right one. I thought the slip ring was just for power transfer between two moving parts. How can they be used in place of limit switches? Also Mike mentioned there is one that allows for signals to pass through. Mike do you have any info or links on this you can share?
Have fun, Dave Schulpius

On Sun, Nov 1, 2015 at 12:20 AM, Mike Handley mike_handley@yahoo.com [B9Builders] wrote:

Me too, using it at the base of the CSS. Commoned several pairs together to transport 24v to the torso, leaving the rest for signal lines.
Mike H



On Nov 1, 2015, at 9:14 AM, Bob Darlington rdarlington@gmail.com [B9Builders] wrote:


Yeah, or at least I'm planning to. I bought the slip ring that was being sold in a group buy through the R2 club. It's something like 20 conductors and fairly small.
-Bob
On Sat, Oct 31, 2015 at 7:01 PM, Daniel Angel danielscottangel@gmail.com [B9Builders] wrote:

Anyone using slip rings on their build?

D.Scott
--
Conquering the world one robot at a time....

[toblueiis]

Hello,

That brings up some good issues. If the limit switch is being used for switching the load (motor), or if it is being used just for generating signals. If it is just signals, that switch should wear out mechanically before it would be damaged by the current load. Just sending a signal takes very little power. Dave S. presented some good points including the possibility of overheating during soldering. It would be nice to see the exact wiring of the switch, with all associated parts.

Some limit switches have pretty high current ratings, and if your switch is being damaged by a current issue, excess current could be pretty rough on the slip rings. Whether you go to slip rings on not, it would still be a good idea to determine what is being your problem in this failure. It could relate to something else you will deal with further down the line with another circuit or mechanism, so you can take this into consideration in further designing. Also, any troubleshooting you will do, helps you be a better troubleshooter in the future. You learn the mindset or thinking patterns of being a better troubleshooter, and it isn't just limited to your robot.

thanks,

David M.


--------------------------------------------

On Sun, 11/1/15, David Schulpius dschulpius@wi.rr.com [B9Builders] wrote:

Subject: Re: [B9Builders] Slip Rings
To: "Tobor001@aol.com [B9Builders]"
Date: Sunday, November 1, 2015, 8:49 AM


I was wondering the same thing as
David above. It's odd that the same switch has gone bad
twice and in such a short time. Usually any type of switch
is rated for tens of thousands of operations and should last
for decades. Some factors that would limit the lifetime
would be over current of the rated amperage, overheating the
lugs when soldering or abuse (slamming into the switch too
fast with the moving load). These stitched also can easily
go out of calibration if not installed and set properly. For
example with micro switches; if you install the switch and
bend the actuator arm so the moving load will trigger the
switch but the actuator arm has to bend a little to trigger
the switch, over time the arm will bend so it won't
trigger the switch anymore. I have limit switches installed
also in both my waist and radar and they hardly ever get
hit. They're just there to calibrate the end points in
the control software and for a panic runaway situation. My
control software (EZ Robot's EZ Builder that's
sending speed and position commands to a Sabertooth 2X32
with a Kangaroo 2x daughterboard) knows where the endpoints
(limit switches) are and will stop short of them (called
Soft Limit points) even if I try to command a move past
them.
Maybe we can help? If your willing
I have a few questions; How are you using these switches?
Are you using them as an end point identifier that needs to
be hit every time to get the motion to go the other way?
What type of switches are you using for your limit switches?
How much amperage are you pulling through them and how many
amps are they rated for? Do you have a few pictures of how
you have them installed?
I'm also curious on your slip
ring expectations. I know little about the types of slip
rings out there. I at first wanted to use one in my build
but was in too much of a hurry when I started my build to
learn about them and take the time to find the right one. I
thought the slip ring was just for power transfer between
two moving parts. How can they be used in place of limit
switches? Also Mike mentioned there is one that allows for
signals to pass through. Mike do you have any info or links
on this you can share?
Have fun, Dave
Schulpius
On Sun, Nov 1, 2015 at
12:20 AM, Mike Handley mike_handley@yahoo.com
[B9Builders]
wrote:

























Me too, using it at the base of the CSS.
Commoned several pairs together to transport 24v to the
torso, leaving the rest for signal lines.
Mike H



On
Nov 1, 2015, at 9:14 AM, Bob Darlington rdarlington@gmail.com
[B9Builders]
wrote:























Yeah, or at least I'm
planning to. I bought the slip ring that was being sold
in a group buy through the R2 club. It's something
like 20 conductors and fairly small.
-Bob
On Sat, Oct 31, 2015 at
7:01 PM, Daniel Angel danielscottangel@gmail.com
[B9Builders]
wrote:

























Anyone using slip rings on their build?



D.Scott

--

Conquering the world one robot at a time....































































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