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Mechanical Engineering

PabLo Dal Buoni

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  1. Hi !! I think you are pretty right this kind of benchs are not like machines with thousands of revs, so a bushing is not necessary. I think the shaft is directly in contact with the base frame. the rest of items.... I agree - A bearing end cap - YES, OR SIMPLY A WIDE WASHER WITH A BOLT FASTENER - A pillow block bearing - YES - Bearing lock collar - I CAN NOT SEE IT - Brass coloured bushing or sleeve? - Through hole plate welded to base frame. - MAY BE NOT NECESSARY - Box section end and pipe within? Box section attaches to seat pad. - YES - Through hole welded to base frame. - YES - Brass coloured bushing or sleeve. - MAY BE - Bearing lock collar. - MAY BE - Pillow block bearing. - YES - Bearing end cap. - YES , (OR WASHER+FASTENER) YOU CAN USE SEEGER CIRCLIPS TOO - Obviously, there is some sort of shaft running through the whole set up. - YES, IN THIS KIND OF MACHINES, YOU CAN USE VERY LARGE CLEARENCES IN ORDER TO MAKE THE ASSEMBLY A LOT EASIER. I hope I helped you Regards.
  2. I would make the frame a little taller in the 4 sides for containing the plate and let gravity to do its job you do not need to clamp the plate, unless it is a rotating grill
  3. Hi ! I am designing a C-hook for handling coils (10 tons) I am going to oxycut it. Anybody knows a book about it? I need to confirm: material (i´d think in low-medium carbon non alloy steel), norms, gage of material, should I relief tensions?, etc Thank you in advance.
  4. do you need something like this? (attached)
  5. It really seems excessive. If the formula is ok, I would re check the constant R (toughness) and the angle (sometimes the formula refers to half angle)
  6. 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 !
  7. 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 !
  8. 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.
  9. First, make sure you are using good quality 12.9 steel allen screws. If they come loose, you may use grower washers.
  10. hello, a drawing would help. I am sorry I can not help you.
  11. 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.
  12. 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.
  13. 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
  14. 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
  15. 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 !
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