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Recent content by aldumoul

  1. aldumoul

    Dampening material

    We typically use Ductile Iron 65-45-12 for spindle housings. This is a great material as it does not seem to get excited at a wide range of speeds (natural frequency). However, we have had a lot of requests for a much lighter solution for applications in robotics. There are other factors to...
  2. aldumoul

    dynamic rotating surface seal help

    Have you looked into using a contact seal?
  3. aldumoul

    Radial Load - End Milling

    Yes, tangential loading is always higher. But I’m trying to figure the moments and reactions on the shaft bearings. Radial loading and axial loading are what I need to figure bearing life. And if the shaft is going to bend, which would create chatter during machining, and may be catastrophic.
  4. aldumoul

    Radial Load - End Milling

    Anyone know of a program that calculates radial load? It is important in order for me to figure bearing life and shaft bending moments (we’re a spindle manufacturer). In my research, I have found this calc to be quite involved (merchants circle). Using a calc within Kennametal’s website, it...
  5. aldumoul

    Emergency stop torque vs peak torque

    Max shear stress is what I used for the calc.
  6. aldumoul

    Emergency stop torque vs peak torque

    I did a hand calc and I came up with a safety factor of 1.4 against the emergency stop torque. Apex gear states: emergency stop torque is 3x the nominal torque. And peak torque is 60% of the emergency torque.
  7. aldumoul

    Emergency stop torque vs peak torque

    When calculating shear Stress from the output of the shaft, should I use the emergency stop torque or peak torque (max acceleration torque)? Hopefully, it would be correct if I were to use peak torque in my calculation. That way I wouldn’t have to increase the size of our spindle, which is...
  8. aldumoul

    FEA beginner help

    Hello, haven’t used FEA in quite some time. Not sure how to interpret the results. I found in my hand calc, the max stress the broached shaft will see is 2830 psi. And the max/yield to be 4026 psi. Which matches the Von Mises result. The analysis is for torsion in the cross section of the...
  9. aldumoul

    Spindle torque, belt driven

    Yes, 103/2.57. Realized my mistake after I submitted the post :) Thanks!
  10. aldumoul

    Spindle torque, belt driven

    You are correct used the full load torque. Breakdown torque is 103 lb-ft. Sounds like I should’ve went with my original calc.. 2.57*motor torque of 103lb-ft
  11. aldumoul

    Spindle torque, belt driven

    Wondering what the torque would be in a 2.5” dia. Spindle. Spindle speed=9,000 rpm. Spindle is driven by the motor, pulley ratio is 2.57:1. Shaft weighs 66 lbs. Motor torque = 40.2 lb-ft Motor hp = 15 hp Motor speed = 3500 rpm Motor shaft/rotor inertia = 0.474 LB-FT^2 I calculated the max...
  12. aldumoul

    Belt Pull Calc

    OK... this is how I came up with the answer: Step 12 A - just add those 2 calcs together :) see page 183 in Gates manual (your browser will say you're on page 185) https://files.engineering.com/getfile.aspx?folder=e57da752-7d7a-46af-8692-b9153af8f3a4&file=powergripdrivedesignmanual_17195_2014.pdf
  13. aldumoul

    Belt Pull Calc

    Yes - but still struggling to find what I need.
  14. aldumoul

    Belt Pull Calc

    Hello - trying to figure out how to calculate the pull on the belt... Motor: -Pulley pitch dia. = 2.23" -HP = 1.5 (service factor: 1.7 = 2.55 HP) -RPM = 1165 -Torque: 81 in-lbs Spindle: -Pulley pitch dia. = 2.86" Belt -Span: 9.49" -tension = 78.68 lbs -Belt mass: 3.9 g/m -Width: 25 mm (1")...
  15. aldumoul

    Spindle moments

    So, I have moments created by belt pull, motor torque, axial and radial loads from tooling. I can consolidate it all and I get about 5,000 hrs. What I’m not sure of… is if I should exclude motor torque. If this was a sawing or machining operation, I believe I’d want to include it. Please let me...
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