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  1. volpegrigia

    Trying to determine torque capacity of a DIN 5480 spline

    It is still a draft/proposal. See if this article helps.http://www.imw.tu-clausthal.de/fileadmin/Forschung/Veroeffentlichungen/1998_02.pdf
  2. volpegrigia

    Efficiency of 2 d.o.f. planetary gear trains

    try "G. Henriot - Planetary gear trains". He has a complete tratise on the subject.
  3. volpegrigia

    Thrust ball bearing running surface

    The friction is a function of the localized deformation you will have. The harder the material the lower your deformation. The harder material (non magnetic) we used were PH steels (15-5; 17-7; etc.) that get to ~40HRC. You can machine the raceways form this material.
  4. volpegrigia

    Linear Motion equations for trapezoidal move

    Try this. It has some fixed cycles (triangular and trapezoidal with 1/3 acc, 1/3 steady-state and 1/3 deceleration) as well as a trapezoidal with varying times. http://files.engineering.com/getfile.aspx?folder=b1bc1716-2b18-444e-975e-7ffde2710d1f&file=Motion_Profile.xls
  5. volpegrigia

    Superfinishing

    There are articles out there on the benefits/drawback of finishes and those are application specific. In bearings (or any Hertzian contact with relative motion), the surface finish cannot be too good or the ability of the oil to form a EHL film is impaired. In roller rocker (the follower od)...
  6. volpegrigia

    Compress Spring question

    I read the question late. In automotive suspensions (i.e. McPherson struts), designers tend (or at least did so it the 80's) to include thrust bearings to accommodate the spring rotation during compression/extension to improve the NVH of the vehicle itself. These bearing cartridges were...
  7. volpegrigia

    Induced Axial Force at tapered bearings

    In a preloaded set of tapered roller bearings without external loads, the net axial force is 0, though there is strain at the interfaces where the preload is applied (flanges, bolts, etc.). The thrust forces in a tapered roller bearing arrangements using a specific bearing size are a fixed...
  8. volpegrigia

    transmission capacity thumb rule

    Tmoose, The design rule of thumb I mentioned before is as follows: Shafts Center distance [mm] = 30 x (torque [kgm])^(1/3) This is from the older fellow I met years ago that designed most of Iveco truck transmissions.
  9. volpegrigia

    Subsurface stresses elliptical contact area

    here you go!http://files.engineering.com/getfile.aspx?folder=7f3bffa4-ee65-4542-9430-fd6cd1703dc0&file=Subsurface_from_AB_Jones.pdf
  10. volpegrigia

    Subsurface stresses elliptical contact area

    If you have the formulae for point contact, then you have the formulae for elliptical contact. Point contact is a special case of elliptical contact (at least it is treated that way by all of the texts I have. The issue you will have to calculate the subsurface stress, is the ability to...
  11. volpegrigia

    transmission capacity thumb rule

    I have heard of a general formula used by the European industry to determine the maximum torque that can be safely transmitted for a given shaft center distance in a cascade automotive gearbox. It was mentioned to me, about 20 years ago, by an Iveco engineer that had been in the business of...
  12. volpegrigia

    Stacked Thrust Bearings

    To increase your system load ability you can use angular contact ball bearings, as long as they are suitably matched for stacking, or specially produced thrust cylindrical roller bearings (called "tandem"). The latter were specifically designed for applications with limited radial space but...
  13. volpegrigia

    Gas Mileage Gears

    Wind drag force is a function of the square of the velocity. Wind drag power is a function of the cube of the velocity. Thus going twice as fast will require 8 times the power.
  14. volpegrigia

    Gas Mileage Gears

    I believe gas mileage is tied to motive power. At the same speed, the same car should require the same motive power, regardless of gear ratio. The gear ratio will affect the delivery of power to the wheel and the efficiency of the drive train. A Pontiac GTO with a 6 speed manual transmission...
  15. volpegrigia

    Bearing Design Question

    There are "rules" to select minimum circumferential clearance in full complement bearings. These "rules" are not always published. INA, for example, has an internal document called A315 (I believe my memory is correct) that shows the minimum clearance required as a function of the bearing...
  16. volpegrigia

    Round Rail Linear Ball Bushings - Dry Lube Option?

    There are some product used succesfully in applications such as yours. Molykote 321R is a spray that air dries and is an effective solid lubricant. Also Klueber has a solid lube with similar charateristics to the 321R. You can also improve the performance in a linear baeraing application...
  17. volpegrigia

    bearing preload design

    These are a couple of books that delve into the subject of bearing design, analysis and application, including preload. Brandlein - Ball and Roller Bearings: Theory, Design and Application - Wiley Harris - Rolling bearing analysis - Wiley I hope this helps.
  18. volpegrigia

    Bearing Selection

    The life of the product is about 60,000,000 cycles which would give a C/P allowed of 3.91 (3.91^3=60). Thus the equivalent load on the bearing should be around 34.5 kN (7750 Lb). If the load on the bearing is in line with the above, you have an application that is designed poorly (the...
  19. volpegrigia

    Anyone know a very small pultruded I profile available in the market?

    Some time ago I had used Werner Aluminum as a pultrusion supplier. They have a pultrusion plant in western PA. I am not sure they can help you or not, but it may be worth to contact them. Another source of information will be the pultrusion council (see link below)...
  20. volpegrigia

    Unlubricated, cryogenic bearing

    The bearings they quoted you are designed to operate in cryogenic fluid and they have been tested in the shuttle turbo pumps (used to fuel the motors with both components, fuel and oxidizer). The lubrication in such application is critical specifically due to the fact that the cryogenic fluid in...

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