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  • Users: rharr
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  1. rharr

    DIN 5480 Spline Tolerance

    I've been working with ISO tolerances for a while and have been puzzled by this. Are the classes used for splines the same as for general holes and shafts even though the nomenclature is reversed? A typical call out for a shaft could be 150f8. However the tolerance on a spline shaft would be...
  2. rharr

    Is horsepower horsepower?

    We have a situation with a plastic processing extruder where we have changed the screw design for more output and the maximum speed is now limited to 65 rpm. The old screw would turn about 85 rpm. The drive motor is a 300 Hp DC working through a 15.49:1 reducer. With 1750 rpm at the motor we...
  3. rharr

    Side loading of a shaft

    We have a possible project of converting a machine with a reducer (gear box) being driven directly by a motor through a shaft coupling. The conversion would move the motor off the centerline of the input shaft and add pulleys and belts to reduce the speed of the reducer's input shaft while...
  4. rharr

    Extracting parts of a fraction in Excel

    Hello. I use Excel a lot for metric conversions as I draw in both inch and metric in AutoCAD. The problem with AutoCAD comes with using fractions - AutoCAD doesn't like fractions with decimals. Because of this, I use 5/127 or 127/5 for metric conversion instead of 25.4. How can I get Excel to...
  5. rharr

    220V Outlet Voltage

    Let's start by letting you know I'm a mechanical engineer with an electrical question. My stove recently died. One of the elements in the oven arced. However, nothing on the stove works now. After checking the fuse panel and not finding a tripped breaker or blown fuse (I also have part of my...
  6. rharr

    What is 38 CAD 7?

    We've been using Nitralloy 135M for similar parts. Are we close?
  7. rharr

    What is X35CrMo17V?

    Or more specifically, what can we get in the states that is close to this? Thanks.
  8. rharr

    Non-standard splines

    I'm trying to draw a hub and shaft to look at the quality of fit and can't seem to find calculations for non-standard splines. The shop making the hub told me they are cutting a 24 tooth spline with a 7/9 diametral pitch and a 27.5 degree pressure angle. Yes. That is correct. That's what I was...

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