Search results for query: *

Thanks everyone. I have re-looked at the problem again. Well, I guess my boss passed me the wrong information. After looking at this problem and studying at the cad-models again, I realized that the stresses is all acting on the ring of the cylinder and not the ring flange. Therefore the...

Guys Sorry for the confusion. I have a circular plate welded to a tube. I wanted to calculate the bending and shear stress so that I can see whether the weld is strong enough for my application. I have attached a pic of my problem and it will be great if someone can point me to the...

Guys I borrowed the attachment from the web but I have a similar problem. I am trying to cal the bending stress of a circular disc but it is sort of different from the generic beam formula we use. I wonder whether we can still apply Bending stress = MY/I Thanks for all the help

Hi thanks for your input. Yes, error can be duplicate. I suspect the electronics or some loose parts in the system. However, this seems interesting bcos usually, anything loose will cause every index position to be out. However, it look like it is just 2 out of 5 position. I hope it is not...

Guys I have a timing system. Belt material: neoprene belt with reinforced glass Pulley material: aluminum ratio: 2:1 Run 1: 25 deg rh80%. No issue. System performance as per expectation. Run 2: 30 deg rh80%. out of 5 index position, 2 are off by 10 deg. Run 3: 25 deg rh80%. performance...

Sorry, my mistake. The encoder resolution is 0.01 not 0.001. For timing belts like Gates GT3 series, I realise there is some wear/ drift after running the reliability test. I wonder how durable are these belts as I cannot find any information pertaining to belt life or wear.

Hi That is based on firmware control

Hi Sorry, I am using an incremental rotary encoder with a resolution of 0.001 deg. I am using a timing belt system.

The resolution is 0.001

Thanks guys. I did an experiment to run the small pulley 40 times at 720deg interval then measure the output angle with a rotary encoder on the big pulley. My observation: - Rev1) Small pulley = 720deg [Input], big pulley = 360.01deg Rev2) Small pulley = 720 x 2deg [Input], big pulley =...

Guys I need some help over here. I have a timing pulley system driven by a timing belt with 2 pulleys with a teeth ratio of 2: 1 [Large pulley = 38T, small pulley = 19T]. I wonder whether in timing belt design, the ratio is dependent on the number of teeth on both pulley or the PD of both...

Guys Sorry to ask this stupid questions. When we size a stepper motor, we need to calculate the load inertia. However, if I were to use bearings and my load is driven by a timing belt system, how do I go about calculating the inertia of the bearings and timing belt?

Hello everyone I am considering between using a 2 phase single shaft stepper motor vs 2 phase stepper motor with gearbox. I know the advantages of the gearbox stepper are as follows: - 1) Torque amplification 2) Speed increase/ reduction ratio 3) Smaller resolution 4) Lower inertia ratio...

Hi The backlash specs is provided by the motor vendor. The gearbox comes attached to the motor. I wonder whether there are seperate gearbox available in the market for stepper motor. Maybe I can source for a better gearbox.

Guys Thanks for all the information. Let me try to explain my design: 1) I am using a 9: 1 gear ratio stepper motor with a backlash of 2deg max 2) I have a timing pulley system with a 2: 1 ratio. Meaning to say I would see a max backlash of 1 deg max at my wheel. 3) If I design the whole...

Hi Mike Am I right to say that problems results from large inertia ratio of stepper motor can be overcome by using microstepping?

Hi I am actually sizing a stepper motor for my optical filter wheel indexing. Previously, I have size a suitable motor with a gear ratio. It is working fine until we encounter a problem due to backlash. In order to resolve the backlash issue, I suggest using a larger motor without gearbox...

Hi I wonder if the inertia ratio for stepper motor is very high, what is the impact? Will there by mis-step?

The positioning accuracy of the system is +/-0.1deg. The current backlash of my motor is +/-1 deg. I have a 2:1 pulley system which will further reduce this backlash to +/-0.5deg. However, I am planning in advance in case there is really a problem. Based on my understanding, if we run the...

Hi Mike Thanks for the comments. I am planning to put a rotary encoder at the end so as to provide a closed loop feedback to the stepper motor to do some adjustment. I wonder whether this eliminates the backlash problem?