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  1. Vipul19

    2 retaining walls close to each other

    Thanks fatdad - You have explained the intuitive behaviour perfectly!
  2. Vipul19

    2 retaining walls close to each other

    Yes I have, the slab above will actually be structural/suspeneded. This "silo hangup" effect is what I am wondering about. Can you use this?
  3. Vipul19

    2 retaining walls close to each other

    I have a situation where there is a basement wall 10ft (3000mm) high. on the interior side of the wall approx 900mm behind it, is another wall to support a fireplace (also 10ft high). The small 900mm space between the two walls will be backfilled. While designing the exterior for retaining is...
  4. Vipul19

    Relationship between motor amps and force through the cutting blade

    Thanks lukin - I thought you were volunteering :-> Also thanks to Mike. I assume by removal rate, you mean #teeth x tip speed?
  5. Vipul19

    Relationship between motor amps and force through the cutting blade

    Based on what you did, is the following correct: From your ppt: 13.2A = 73% load = 700lbs of pusshing 8.9A = 48%load = 700x48/73 = 460lbs of force?
  6. Vipul19

    Relationship between motor amps and force through the cutting blade

    Thanks electricalpete! I was hoping that it was linear, and it looks good enough for me I think. Thanks again.
  7. Vipul19

    Relationship between motor amps and force through the cutting blade

    I know I am asking for too much. We have been really getting into the blade design and found a few interesting things: 1. The original blade was not dull at all. Apparently, because of the large number of teeth, the "chip load" was very low. This is a parameter that quantifies the amount each...
  8. Vipul19

    Relationship between motor amps and force through the cutting blade

    Sorry - Idle is at 3.7 amps and it was with a clamp meter. Thanks again.
  9. Vipul19

    Relationship between motor amps and force through the cutting blade

    Ok, here is what I have recorded: Initial Setup Force through motor was 700lbs. Force to overcome frictional drag is 100lbs Original blade was 15" diameter and had 80 teeth Motor amp reading was 13.2amps Feed rate was 8.3 ft/min Motor plate information is: 256T 20 HP TYPE SCE 3 ph, 575V, 60...
  10. Vipul19

    Relationship between motor amps and force through the cutting blade

    I have a cutting operation where I had a 14" blade with 80 teeth, spinning a 1800 rpm with 10HP motor. The material being cut was pushed through at 8.3ft/min. We measured the amp load on the motor. The force required to push the material through was approx 800lbs. Then we changed the blade to...
  11. Vipul19

    VFD and vector duty vs inverter duty motors with or with encoders

    What happens at the 2 ends of each cycle? If the cart is moving fast with small torque (83 ft-lbs on max capcity gear of 1600 ft-lbs) and I have a sensor to indicate that it is near the end of travel. Then I can program to slow down and still keep the 83ft-lbs max. When it hits the end of the...
  12. Vipul19

    VFD and vector duty vs inverter duty motors with or with encoders

    My gear supplier is not familiar with the term negative torque (should I be worried?). I assume that if the VFD is operating at 120Hz, and the motor is spinning at around 1760RPM and the gear is spinning at around 35 RPM with a torque of around 83 ft-lbs., the negative torque refers to the drive...
  13. Vipul19

    VFD and vector duty vs inverter duty motors with or with encoders

    Thanks everyone for the input! I am learning a lot about the lingo as well as what will work best for my application. I have asked to confirm that the gearbox quoted to me is capable of negative torque for braking and will pursue the non-encoder option. After reading the posts, it seems clear...
  14. Vipul19

    AC drives

    I started another post, but will mention here too. We have come up with 10HP and 49:1 gear reducer. Inverter duty motors seems to work with respect to lowest required rpm (15:1 constant torque is more than enough. I only need 11:1). Based on my post above, I was wondering if anyone can give me...
  15. Vipul19

    AC drives

    Sorry I was not clear on the encoder/sensor thing. 1. We plan on signalling running the drive at around 50 - 60Hz for 2 – 2.5 sec. – This is the inital approach to the cutting heads 2. Then 5-10Hz for about 30sec – 40 secs – This is the cutting phase 3. Then 120 Hz for about 2-3secs. – This...
  16. Vipul19

    VFD and vector duty vs inverter duty motors with or with encoders

    I am designing a drive system that carries cement material through cutting heads on a tray and then returns for new material. I have established the gear ratio and motor size. I need a 10HP motor that is capable of 155rpm to 1800rpm under constant torque. Based on this, I have been told that an...
  17. Vipul19

    AC drives

    It is horizontal, but our return speeds will be around 300ft/min. I would guess that we do need braking? Vacon is local and we were leaning this way, but I thought I would ask to see if anyone had any experience either way with the different options. I found Allen Bradley to be extremely bad...
  18. Vipul19

    AC drives

    I am trying to decide which drive to buy and they all seem to be the same. Can someone help me to choose between: Vacon Benshaw Allen Bradley I have a fairly simple low voltage application and need a drive to run a 5hp motor driving a conveyor back and forth. 1000 cycles per day...need...
  19. Vipul19

    planetary gear sizing based on required output

    Thank you PeteDB: So as long as I have 15HP motor (Not cheap for inverter duty), then I can do what I need?
  20. Vipul19

    planetary gear sizing based on required output

    Hi I have a question regarding sizing the gear for a specific range of output. I have an application where I have a carriage bringing material through cutting heads and then returning on a linear actuator. I would like to use an inverter duty motor (say anywhere from .5HP to 2HP). I would like...

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