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  1. ihopeitworks

    How to prevent steel oxidation without protective atmosphere or vacuum?

    I need to heat steel up to around 640C for about 30 - 60 minutes through induction heating. At that point I will allow it to come to room temp naturally. I cannot do this in a vacuum nor protective atmosphere (gas purging the system). Are there other ways I can prevent oxidation? Which steels...
  2. ihopeitworks

    Determining safe distance from rotating drum

    Are there standard equations to determine the distance to keep away from a rotating drum? I have a metal drum that is rotating at a somewhat high RPM. I assume there'd be some calculation on if a piece of this drum, or a fastener on this drum, were to release at the max RPM, what would its...
  3. ihopeitworks

    Motor Brands for small 90 N-m brushed DC geared motor

    I have an application where I'm limited to ~500W and need a geared motor that can provide at least 10 RPM at 90 N-m. Seems Maxon and Micromo cap at around 20 N-m. I found something on midwest motions, but the form factor is something like 3" dia x 12" length. Is there any other brands I can look...
  4. ihopeitworks

    Machining soft aluminum, 6061-O

    Are there any recommendations on how to machine soft aluminum without lubricant, specifically 6061-O? What are the recommended methods? Found this post, but it's from 10 years ago, and maybe the cutting tool technology has changed since then...
  5. ihopeitworks

    MMPDS 6061-T6 Fty vs Temp

    I'm looking at the Tensile Yield Strength of 6061-T6 at various temperatures and found in MMPDS two tables that are different from one another. Which table would you use and why? Their descriptions are basically the same, but the chart is completely different. I'm using MMPDS ver 10 (1 April...
  6. ihopeitworks

    Shaft misalignment

    Thanks JJPellin, https://us.misumi-ec.com/vona2/detail/110300107830/?HissuCode=B6804DDU We're sort of stuck with these due to size constraints in the assembly. Each bearing would only see about 75 lbf max during operation at ~250 RPM. We haven't spec'd in the sort of fits, but I believe we...
  7. ihopeitworks

    Shaft misalignment

    I have a 2" dia shaft that has two ball bearings on both ends at about 20" apart. I have been trying to find what sort of misalignment I can get away with, but fail to find anything concrete. The bearing mfr does not give misalignment allowance so I'm wondering what standard practice is?
  8. ihopeitworks

    Dowel Pin Depth

    I have a small face mounted DC motor that has 3x 2.05mm dia, 7mm depth holes. I am wonder what is a good rule of thumb for the depth of pressing in dowel pins. I tried some googling, but haven't come up with a definitive answer.
  9. ihopeitworks

    Motor is making weird noise

    Yikes, Here's the link: https://www.rexelusa.com/usr/Root-Category/Control%2C-Automation/Variable-Frequency-Drives/Drive-Accessories/Servo-Motor-240V/Allen-Bradley-TLY-A2530P-HJ62AA-TL-SERIES-TLY/p/50297 I'll look in the software to see if there's a mode to auto tune the thing. Thanks for...
  10. ihopeitworks

    Motor is making weird noise

    Our 3PH AC motor is making a weird noise. This is the motor in question: http://raise.rockwellautomation.com/RAConfig/resultsComponents.asp?CID=83F8F5F0A92A4CBCA447F88026C621A4 What are the typical causes for noise. Video of the motor: https://streamable.com/ns9sg
  11. ihopeitworks

    Spec a 3PH motor

    jraef, I'm using a 5HP motor (Dayton) with a GS4-2015 (automation direction) VFD. I asked their tech support what current the VFD needed for single phase 230V, and they advised that the input is 40A. Looking at the motor nameplate, it calls 13A at 230V. I would imagine that my 7000W generator...
  12. ihopeitworks

    Spec a 3PH motor

    What happens to a VFD if I don’t have enough current going to it? Tech support said it needs 40A, but I’ll only have 30A. I’m looking at alternative generators for this setup, but want to see what’ll happen if I try hooking it up as is.
  13. ihopeitworks

    Spec a 3PH motor

    waross, That shouldn't be an issue. I have some blowers that I can route near the motor's fan. We should only be running the fan for 5 minutes at a time. 2 - 3 start ups per hour.
  14. ihopeitworks

    Spec a 3PH motor

    jraef, Thanks for all that info. Helps a lot. I believe I'll then be looking into 5 HP motors that can run off of my single phase input. I will plan on using the 4 poles in the standard configuration and utilize a VFD/SVC. What other brands would you consider better than AutomationDestruct...
  15. ihopeitworks

    How to spec 3PH AC Motor

    Thanks LittleInch and jgKRI, I posted in the electrical board. My existing VFD was able to get down to 40 RPM (I believe this would be ~1.5 Hz... if this is correct: 40 RPM / 1750 * 60), I had the display as RPM and not Hz.
  16. ihopeitworks

    Spec a 3PH motor

    jraef, This is the nameplate on the motor I currently have. We are using an Automation Direct GS2-22P0: https://www.automationdirect.com/adc/Shopping/Catalog/Drives/GS2_(115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control)/GS2_Drive_Units_(115_-z-_230_-z-_460_-z-_575_VAC)/GS2-22P0 I was able to...
  17. ihopeitworks

    Spec a 3PH motor

    This may be a separate issue, but I just tried using my 2HP motor and tied a cable to the drum and attached a scale to the end of the cable and had it fixed. Turning the VFD to full power, the motor would only pull 3 lbs (around a 12" drum, so 1.5 ft-lb of torque) before the VFD would shut off.
  18. ihopeitworks

    Spec a 3PH motor

    I currently have a 2HP, 3PH, 60Hz AC motor, that is connected directly to a 12" dia drum. In the past, I would pull a cable that is wrapped around it with 2 lbs of tension (torque of 1 ft-lb). I have a new project that I am working on that requires a 10.75" dia drum pulling a cable that will...
  19. ihopeitworks

    How to spec 3PH AC Motor

    I currently have a 2HP, 3PH, 60Hz AC motor, that is connected directly to a 12" dia drum. In the past, I would pull a cable that is wrapped around it with 2 lbs of tension (torque of 1 ft-lb). I have a new project that I am working on that requires a 10.75" dia drum pulling a cable that will...
  20. ihopeitworks

    Getting Young's Modulus of a Fiber Optic Cable

    We went ahead and modeled without Young's modulus since we decided that the drag was the larger force acting on the cable. prex, just wanted to chime in and actual flight test showed the path of what I drew in for our configuration. Thanks everyone for your input and help!

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