Recent content by Zarathuztra

@Asymptotic mptotic Thanks for the info. I checked Allied Electronics and it looks like they may have what I'm looking for. I'll see if they have an applications engineer available to pick a suitable option.

@anorlunda : I've edited the OP to include responses to your questions. Current Max: 6A Power Max: 70W Frequency of cycling: likely ON/OFF 2 times a minute at the most, usually slow than that. shortest duration will be ON part of the cycles and that should be a 4 seconds at minimum. The...

Setting up a test stand that will need a controller to cycles a device ON and OFF at an adjustable time interval (allows me to make the ON duration and OFF duration whatever I want). It will also need to keep a count, so I can track the cycles count and also set a limit on cycles so it will stop...

hmm... that seems too easy to be true... I would have to get information on the machine to make sure it has clearance to lay on the encoder and to mount the optical sensor. Is there an optical option that would be able to read RPM from viewing the pulley/shaft from a radial perspective? In case...

I circled a pulley as an example. I will need to track it's RPM.

@berkman, this is for a future setup so there isn't anything to photo just yet. But to give you an idea, I'll be reading the speed from a spindle on a lawnmower deck.

@berkman, I would not have the luxury of being able to install such a disc. I'll need a way that doesn't require me to add anything to the rotating spindle. ( I think reflective tape might be OK though, since it would not have an effect on the results.)

@berkeman @jrmichler For the data acquisition.. In an effect to keep this inexpensive, I plan to use DAQExpress on a laptop, with cDAQ-9174. If anyone recommends something different, please let me know. Knowing the speed of the rotation is not entirely necessary, just the coast-down timing...

Thanks, I have added that and some more information to the OP. Unfortunately I do not have an exposed gear =(

I have no previous experience collecting RPM data so would like advice from those with previous experience. I need to collect RPM data from my machine and record it's behavior as I apply and remove power. I'll be engaging and disengaging a load. So I'm trying to find out how long it takes for it...

I have a blower within a system, and I'm trying to calculate the system inertia. I'd like to get the moment of inertia for this component as would be seen by the shaft. It's shape has me a little stumped (considered perpendicular axis theorem) on what method to use for finding the inertia. Any...

In that case I would say the tendency is for logarithmic and exponential. Could you suggest an example model for logarithmic?

I'm attempting to reclaim lost knowledge... hopefully this works. I would like to take a data set I have x,y values and project the trend beyond the (10) values I currently have. For example, I have a graph with (10) values for x and y, but would like to graph the trend created by values 1-10 to...

Attempting to determine the torque on the shaft of a pump. Known values are flow rate, RPM, and shaft diameter. 1. What other values are needed to make the calculation? 2. What is the equation I can use for this?

ah that's what was wrong with my input.. lol. Thanks gneill