Small update... The clutch is installed and the motor is happy. No noticeable effect on the performer as well.
Thanks for all the helpful comments and ideas.
Great post, thanks jstewart!
This is good to know moving forward, if we need to do something similar in the future.
In our test our system was operating in local with no servo information being used. Right now the plan is the torque limiter and to loosen the belt idler tension. If that falls...
We will look at this EngineerTex, thanks for taking the time to explain what you think is going on. I don't know the details of our DC motor system.. it's all fairly old DC servo gear, on Allen Bradley drives.
Adding a spring to any of the tensioning means going back to the computer model and...
Of course this will all be tested.. Safety is very very important when human subjects are involved.
The torque limiter will only slip in the upper 10% of the curve, it eases back in as the torque eases back. As I understand it this is precisely how home and gym treadmills work, and when they...
In this particular instance he was running toward the drive roller. There is no slack in the belt, we have an idler roller on the bottom to keep the tension tuned in. (we were unable to have adjustable end rollers due to space constraints)
The spikes were going up.. it's a 15 amp motor and we...
This is a one off, same is everything we do. So price really isn't a big concern. If we were manufacturing many of these then it would be more important. I have no idea about our automation drives, they are old DC servo based, if our automation guys could handle the spike they would've done...
We have a 220 lb. test subject running when the spikes occur. The spikes are all over the place. They don't occur at lower speeds, only at at high speed with the heavy foot fall. The spikes are over 30 amps.
In the past we've used much longer belts, and I guess the elasticity has acted as a...
We're having an issue with a small treadmill. We're using a 15amp DC motor and when someone is running on the treadmill we're getting current spikes that are faulting the system.
The treadmill is 4' wide, by maybe 5' long on the top, with 6" dia. rollers with a belt linkage to the motor...
The low friction test piece came this morning from Mcmaster, it doesn't have a name on it but I wouldn't be surprised if it was the Bristow type by Tuthill.
We're going to bulkhead the connectors to get to the length we need. I think I can package this well. Still need to transfer motion from...
Thanks for the suggestion Clyde38.
We've used linear chain in the past, but it doesn't fit in this application I don't think. Ultimately this is a straight up linkage, the twist is that it needs to be designed to accommodate a large deflection in it's main frame and not jam up.
I'm currently looking at to cut-to-length bowden cable.. with end collets. I'm aware of the lost motion, and I think that will be ok. The item we're moving will push back against a bumper in its closed position. We will trim the piece in it's open position.
Just need to be careful of it's...
I'm looking in McMaster, as well as Aircraft Spruce. They have some stuff.
We have a deflection in a frame, it was to be expected. We've tried a semi-rigid linkage (chain and tube) and the deflection makes it an issue. Thus the idea to use something flexible.
Greetings Eng-tips!
I'm looking for Push pull cable, similar to throttle cable, but for a larger application (perhaps 200lbs or so, max 11' distance, roughly 4" push/pull). But this is the easy part.. the more difficult part is that we need the parts to be crimped and fitted in our shop. Most...
