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  1. gb2835

    Are these equivalent?

    See attached. I understand that with the left FCF that Rule 1 no longer applies. The right FCF, though a different symbol, controls the same thing (form of axis). Would Rule 1 also not apply with the TP? This came up on a drawing I reviewed. I told the designer to switch the TP to Straightness...
  2. gb2835

    Hall Sensor Spacing for BLDC Motor

    Our lab previously purchased several BLDC motors with 21 pole pairs and 36 stators. These motors did not come with hall sensors, and previous lab members produced a pcb containing such sensors. They based the spacing on the hall sensors on the number of stators, so the sensors are 40° apart (80°...
  3. gb2835

    1045 CS - Corrosion Prevention

    I work in a lab where several gears, shafts, etc. are 1045 CS. I was tasked by my advisor to look into methods that help prevent corrosion. These components are used in walking robots in normal room settings, so no moisture minus lubrication on the gear teeth and oils from skin contact...
  4. gb2835

    Gear Grease Recommendation

    My advisor has tasked me with finding a grease to use for our gear assembly. The gears are not in a gearbox, thus oil is not ideal. The gears also work at low speeds (on the magnitude of a person's walking gait cycle). Temperatures are also on the magnitude of room temperature (not constantly...
  5. gb2835

    I just posted this in the SolidWork

    I just posted this in the SolidWorks section but perhaps you all have encountered this as well: Not sure if this more appropriate for the GD&T or SW topic but I'll start here. Has anyone ran into the issue I am having below (or attached, can't tell yet). In 2022, the FCF doesn't look right...
  6. gb2835

    2022 FCF Issue

    Not sure if this more appropriate for the GD&T or SW topic but I'll start here. Has anyone ran into the issue I am having below (or attached, can't tell yet). In 2022, the FCF doesn't look right, and I can't figure out a way of how to address this. I've contacted my VAR, who contacted SW, who...
  7. gb2835

    Schematic Drawings Multiple Sheets

    As an ME we often have parts and assemblies that take up multiple sheets on a drawing. I have been tasked with doing some electronic schematics for PCBs, and was wondering how/if something similar is done. The heart of my schematic is two separate 19x2 position connectors that go to a...
  8. gb2835

    Qualifyinig Datums

    Hi Everyone, In the basic example where Datums A,B, and C are perpendicular planes and are in order from primary to tertiary, I have really only seen (in inches) Datum Feature A with .005 Flatness, Datum Feature B with .005 Perp [A], and Datum Feature C with .005 Perp [A|B]. I understand doing...
  9. gb2835

    Computer Engineering Assistance

    I am a mechanical engineer starting a PhD in robotics. A good portion of the program requires mechanical design, which I am comfortable handling. The other portion is embedded code, which I am less experienced with. I didn't see a forum on this site that addresses this (unless I missed it?) so...
  10. gb2835

    Another CM Question

    Operating as “parts don’t have revisions,” how does one deal with a part that has a requested change that doesn’t affect FFF, but the part model itself will be modified? I’ve thought of three approaches: 1. Don’t actually change the model but revise the drawing with the changes. Drawing won’t...

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