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  • Users: durablack2
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  1. durablack2

    What process / method to make this aluminum edge?

    What method is used to form / roll the outer edge of this aluminum disc on this hose reel? See green arrow in attached pic. The end is folded over to prevent any sharp edge from cutting the hose or operator. May add a little strength too... If you press it, it would need to be 2 steps (one...
  2. durablack2

    two proximity sensors, One LED light for system status

    Hey guys, I am looking to use two proximity sensors to indicate position of two devices (open and closed). Each device will have it's own proximity sensor. I would like to use ONE LED light to know the status of the system (open = green, closed = red, 1 open 1 closed = red) When the devices...
  3. durablack2

    spring mounting design differences

    I am curious if there would be any noticeable difference in feel or longevity of two different spring mounting systems. On one end of the system we will have a moveable, range limited rod that mates up with a compression spring. The opposite end of the spring will mate to a fixed surface. The...
  4. durablack2

    compression spring force and active coils

    If you have two compression springs and everything is the same except number of active coils, which will take more force to compress? The one with more coils or one with less coils? Take for example: Spring 1= 6 inch long, 1in outer diameter, 0.1" wire diameter, 10 active coils - compress 2...
  5. durablack2

    Weld Repair of Castings and heat treatment

    Should weld repairs be conducted before or after initial heat treatment after casting? I am seeing mixed messages from sources I find online and from different regulatory agencies and it is not really defined in the ASTM standards I am reading. I am mainly looking at ASTM A27 and A148 but...
  6. durablack2

    Hot Dip Galvanizing reduces strength by 20%?

    Any basis in this claim? I am aware HD Galvanizing can cause hydrogen embrittlement but does it reduce overall strength of 'smaller' steel parts by 20%? By 'smaller' I mean 1/2" to 1" diameter rod or bolts.
  7. durablack2

    Quality management program

    I work for a small company with about 5 QC personnel. We have a homegrown access program that our QC dept uses but would like to get something off the shelf to replace it so that we do not have to spend time upkeeping it. We design parts and have them made by factories overseas (we are not a...
  8. durablack2

    HOW TO MODEL THIS BEND

    I need to model this bend (circled red in attachment) properly in Solidworks but am unable to figure out how to do so using the sheet metal tools. I don't really think it's possible to get what i need using basic extrude / cut tools either. Anyone want to take a stab at it or point me to some...
  9. durablack2

    Degradation of natural rubber vs. epdm due to sunlight and ozone

    We are currently selecting material for a rubber bumper that will be used in loading docks. I am looking to find sources that show degradation of natural rubber (or SBR) vs EPDM due to sunlight, weather, ozone, etc. I know natural rubber is rated as 'poor' in these categories whereas epdm is the...
  10. durablack2

    sheet metal assembly drawing best practices

    I have one sheet metal assembly that made from 2 parts and is welded together. There are several bends on each part and each have several holes that need to line up at the assembly level. Would you guys typically separate the parts and dimension them in separate views or would you dimension them...
  11. durablack2

    casting defects

    Can anyone identify the cause of the bumpy surface seen on these cast parts? They are made of ductile iron and made via shell mold process. The shaft diameter is about 5/8". Is this cold shot? Or is this referred to as something else? Why would one part come out with this bumpy surface and...
  12. durablack2

    GD&T FOR HOLE DRILLED PERPENDICULAR TO DATUM

    I used Solidworks Dimexpert to create the GD&T scheme you see in the picture. In the feature control frame for the Ø7mm hole, why do datums A and C need to be called out at MMC? I don't understand how if datum A or Datum C increases, it will affect position of the hole, that is located about...
  13. durablack2

    HOLE AS PRIMARY DATUM OR NO?

    I have a part that is stamped from sheet metal. There are about 6 rivet holes that should be referenced off 1 larger hole for a pin that is about 25mm in diameter. I have made an example of a similiar part that displays the several methods for identifying the datums on this part. The edges of...
  14. durablack2

    solidworks factor of safety question

    I'm running a static fea simulation in solidworks. I do not understand why the factor of safety output by solidworks is different than my calculation using the maximum Von Mises stress output from the simulation and the yield stress. Solidworks FOS = 1.52 Max Von Mises stresses = 293 MPa Yield...
  15. durablack2

    3d correlation

    I am trying to compute the correlation coefficient between two 3d matrices. Specifically, i am trying to compare a simulated model's efficiency with given input torques and speeds to a bench efficiency test at given torques and speeds. I can go in and pick out several points determine the...
  16. durablack2

    Power steering pump power consumption comparison

    I am trying to determine the differences in power consumption for several non-variable hydraulic power steering pumps along a given route. I have the maps for each pump (speed, flow, pressure, power) - If I have pressure out of the pump, speed of the pump, I should be able to lookup the flow...
  17. durablack2

    Route planning and route data with Google Earth and Matlab

    I am looking to use a program to download road route data from say Point A to Point B ( things like altitude, distance, speed limit, etc.) for a simulation. Does anyone know if it is possible to do so with Google Earth or if Matlab offers a toolbox for doing such things? (I understand things...
  18. durablack2

    AVL Cruise Software

    Anyone use AVL Cruise software? I just started using it at and found that there is not much information on the web about it. If so, I'd like to share thoughts on functionality and capabilities as well as work with other users when issues come up. I think this is a very good software but...
  19. durablack2

    Simulink vs GT Suite

    I am wondering the differences in capabilities between Simulink and GT Suite in terms of automotive simulation as well as the main use of each program. I know there are a number of different simulation programs out there but I am specifically interested in these two. My understanding is that...
  20. durablack2

    How to insert hinge in assembly properly

    Hello, I am trying to insert a hinge into an assembly so that a toolbox lid can be opened. The problem I am having is I cannot seem to figure out how to mate the hinge correctly so that when the toolbox lid opens, the hinge allows proper movement. Right now I have it close (I think). When the...

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