I need 0.5 in OD and have found both to be available. The cam followers were a bit more expensive.
Do cam followers need crown-faced bearing races? Labor is free now, but not in the future.
Would anyone be able to explain to me the differences, pros, and cons of needle or ball bearings as opposed to cam followers. I am looking to run a dowel pin inside a milled cam profile with the least amount of wear.
I am currently running a metal dowel pin in a milled out cam profile shaped similar a tear/water drop. The material that the profile is milled into is a sort of hard plastic but I am seeing extreme wear (abrasive) at the top of the profile where the pin has to switch direction. Does anyone have...
crshears- Was that method used for a permanent magnet DC motor? It seems to me that something like that would work on a brushless DC motor or AC motor but not PM motor.
Thanks for the responses.
I have tried to use an IR sensor but did not have good success. The surfaces of the armature that I am able to see have too low of an emissivity.
I looked into the wireless system a bit, and it looks promising. I've never used one before, so any additional...
Does anyone know a way to measure the armature temperature of a PM DC motor without having to stop the motor? Reading the resistance between two leads requires the motor to be momentarily stopped which I have to avoid. I've been experimenting with thermocouple&thermistors and a Mercotac slip...
Kbradio- Did you find anything that works?
I have been using a Mercotac slip ring connected to either a J-type thermocouple or 5k ohm thermistor, but with poor measurement accuracy.
Looking to make a thermal conductivity measurement device. It would be nice if it could be used to measure contact resistance between two materials in addition to measuring the k value of a material.I rough schematic illustration of what I am thinking to do is attached...
Thanks for the clarification. I did run across that somewhere along the way but it didn't seem cost effective for what we were going for. I'd like to stay under a couple hundred dollars max for the equipment. I did not spend much time at all looking into it though. Do you know what kind of cost...
The brushes of the motor (PM DC) contact the commutator where I am looking to measure so I can't cover/paint the surface. I tried painting a thin strip on the edge where the brushes don't contact but it was too small of an area.
""found the surface was too shiny to get a good infrared reading"...
I suggest that you readup on the basics of IR temperature measurement."
What are you suggesting is wrong with that statement?
What do you mean by "what temperature are you trying to measure"? If your wondering degrees it would be between 20 and 120 degrees Celsius.
Thanks for the advice about amplifying the signal, I will look into it. Due to space constraints there would not be room to place a battery powered device...
Has anyone connected a thermistor to a slip ring? I initially tried using a thermocouple but since there is a change in metals going through the slip ring unwanted emf voltages were generated which were dependent upon ambient air. My next thoughts were to try a thermistor or RTD and Wheatstone...
Has anyone connected a thermistor to a slip ring? I initially tried using a thermocouple but since there is a change in metals going through the slip ring unwanted emf voltages were generated which were dependent upon ambient air. My next thoughts were to try a thermistor or RTD and Wheatstone...
