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  • Users: 310toumad
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  1. 310toumad

    How to dimension male taper

    I have two parts that locate on conical tapers. Attached is the female taper, which they define by calling out the diameter at the narrowest location, followed by the angle. This part already exists and is not made by us. What would make the most sense in terms of where to call out the...
  2. 310toumad

    Basic dimensions of hole pattern

    The usual convention shown for dimensioning holes located on a bolt circle is by assigning a basic dimension of the angle between the holes times the number of instances. My question is would it be valid to have the basic dimension be the relative center distance of the holes rather than using...
  3. 310toumad

    Dimensioning a bolt circle as a radius

    Let's say you have a cylindrical part. When looking down the axis of the part, along the circumference picture several round "ears" protruding. At the center of each ear is a hole (imagine this part as being a casting). The problem is I'm not sure how to dimension the bolt circle of the...
  4. 310toumad

    Datum features for blind holes

    Lets say you have a cylindrical part with two different pilot diameters on each end, and tapped holes on both faces of the part. What is the proper way to locate the holes on each face of the part? I can see a few scenarios: 1.) You have four datums total. The two surfaces which the holes...
  5. 310toumad

    AC motor fan design?

    I've noticed for several different manufacturers of AC motors, the fan design looks something like this: https://www.galco.com/buy/Baldor/36FN3000A01SP?source=googleshopping&utm_source=adwords&utm_campaign=&gclid=EAIaIQobChMIyeqA84Oh5AIVAQOGCh0jDASdEAQYBiABEgJ57fD_BwE...
  6. 310toumad

    Shear strength of A380 aluminum alloy

    I've searched several other threads that seem to agree A380 is considered a ductile material, in which case it would obey failure theory under MSS or DE criterion. If that is the case then its shear strength should be .577Sy or .05Sy. However, when I look up properties for A380, several...
  7. 310toumad

    Calculating max torque for bolt

    If I had a steel bolt being threaded into a tapped hole of a softer material, aluminum for example, how would I go about calculating the maximum allowable torque on the fastener assuming I have enough thread engagement? In this scenario, the only failure I can see is the internal threads in the...
  8. 310toumad

    Continuous feature applied to features along a circumference

    Can the CF call out be used to describe the dimensions of features along the circumference of a circle? For example, an evenly spaced pattern of "tabs" that share the same O.D. In the Y14.5 standard it says its used to "identify a group of two or more features of size where there is a...
  9. 310toumad

    Limits of perpendicularity related to thickness of part

    I looked around and couldn't seem to find anything in the Y14.5 standard that gives any sort of guideline on applying perpendicularity to very thin features. I would think at some point it would become non-sensical to do so because it would become impractical to try and measure it. But how...
  10. 310toumad

    Datum structure for thin sheet metal part

    I have a part that is .036" thick, which essentially looks like a ring with tabs around the circumference of the O.D. (part is about 2.3" diameter on O.D., 1.75" I.D.). The tabs are angled slightly to give a lead-in because the part fits inside a tube with a slight interference. The flat ring...
  11. 310toumad

    Gear pump won't prime so customer trys to plug bypass with grease

    Customer used this pump for several months, then one day says it wouldn't prime. The internal bypass for this pump has an adjustable set screw that seats a ball/spring combination. They took out the fittings in the bypass, jammed in a grease zerk and cracked the housing (probably because the...
  12. 310toumad

    Beam Bending Problem

    Assume a set up in the attached PDF, where you have two twin loads acting on a beam that is welded to two hook ends which are simply supported and not constrained. How would you approach calculating the bending moment at the joint where the beam is connected to the hooks? In my opinion, you...
  13. 310toumad

    HSS statics problem

    If I have a piece of rectangular HSS, with another formed channel resting on top with spacer blocks on the inside, how do I find the reactions of the blocks on the sides that resist the moment shown? I'm not sure if my convention of the angle of the reactions is correct. I believe for the...
  14. 310toumad

    bearing groove radius tolerance?

    Does anyone know if there is a source for the tolerances on a radius for ball bearing grooves? Machinery handbook doesn't appear to have anything, just stuff on housing/bore diameters.
  15. 310toumad

    Reverse engineering part w/ 99.99% pure silver component

    I'm reverse engineering a component that controls an electronic valve that regulates the amount of DEF going in exhaust of a diesel vehicle. One of the components is a ring that a materials lab verified is 99.99% pure silver with no other discernible constituents. Not surprisingly all our...
  16. 310toumad

    Alternative to hydraulic oil in air over oil system

    I'm reading a specification from an OEM that manufactures automotive lifts, and they say for air/oil systems NOT to use hydraulic oil as it can foam under air pressure. They then give some properties for a fluid that appear very similar to AW32 oil. Would anyone have any inclination about a...
  17. 310toumad

    Breather hole in cylinder

    Can anyone tell me why a threaded hole with a breather plug is a better design than just simply drilling a tiny hole to allow air to escape in a high pressure cylinder? Would the smaller hole compress the air more and allow condensation to form?
  18. 310toumad

    Dynamic or kinematic viscosity with gear pumps

    Most specifications for gear pumps list a certain viscosity they are capable of handle at a given rpm, for example : 500 cSt @ 1440rpm. Is this referring to the dynamic viscosity of the moving fluid? I'm looking at charts for SAE crankcase oil viscosity and I see different ones for both...
  19. 310toumad

    wiring on/off switch to electric motor

    I have a single phase, 115V electric motor that is connected to a fuel pump/junction box as shown in the attached wiring diagram on the top left. Normally they are shipped with the three leads (black, white, and brown) hanging loosely so the customer can install the motor and connect wiring...
  20. 310toumad

    Load on electric motor

    I have a 1/3 HP electric motor that is coupled with a rotary vane pump and intended to pump gasoline. If I were to switch it's application, and say, couple it to an external gear pump for transferring more viscous fluid such as motor oil, what would I need to know to determine the max. viscosity...

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