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Mechanical Engineering

PabLo Dal Buoni

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  1. Hello ! if I want to use sealed bearings (for making maintenance much easier) and it is not enough with 1 ball bearing, is it correct to use 2 radial ball bearings in tandem? (not angular bearings, just regular radial ball bearings like a 6208 2RS) This is for a shaft with no axial forces. Of course, it would be 4 bearings in total, 2 + 2. Thanks !
  2. Yes ! I agree. There are some formulas I could find (even considering plastic deformation) but they are very inconsistent. Finally, I took this like a rectangular beam and I considered Tensile Strenght for my calculus. After that, I could find a formula for Power needed. And with the velocity, that I know, I got the Torque. Unfortunately, I can not test nothing. The machine does not exist yet. Based on this and some expierence in the field, It was the best I could do. Thank you very much DrD !! you are the best !
  3. Hi Steve. Thanks. Yes, I know that. I read this in an article in the web. I need some formulas to calculate torque and power needed. Thanks.
  4. First, make sure you are using good quality 12.9 steel allen screws. If they come loose, you may use grower washers.
  5. hello, a drawing would help. I am sorry I can not help you.
  6. hello, you can easily find info in internet and videos in youtube. CVT is a device for power transmission with teorical infinite ratios and no tooth gears. Some cars are using it lately. Honda for example.
  7. anyone knows how to calculate the necessary torque and power for a sheet metal straightener machine or a 3-roller bending machine? I know material streght, thickness, width, rollers diameters and distance between rollers are factors to consider. Thanks.
  8. DrD, JAG, thank you for the responses. I have got it from: "Sheet Metal Forming Processes and Die Design" By Vukota Boljanovic I really think there is a mistake, Knowing E: 210.000 MPa, E square (ExE) would make always ZERO that division, considering YS, D and T very smaller numbers, don't you think? It has no sense. Furthermore, units do not work and there is no constant to fix it, like DrD said
  9. may be with a CNC spring coiling machine I recommend you to make your post short and specific. Sometimes you do not get answers just because there is much to read... good luck
  10. Hello, I am trying to know the force for a 3 roll bending of a 3 mm steel sheet. it seems like this formula is wrong. Units do not match. That E square is not ok, what do you think? thanks !
  11. Hi !! i am designing parts of a strightener. ¿which would be the formula to know the force in the rolls? I considered it like a three-roll bending. I think the formula attached has a mistake because of the units. Someone knows another formula? Thanks a lot !
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