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  • Users: kjoiner
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  1. kjoiner

    Number of poles for circuit breaker when using 230VAC power to a motor on international power

    Hello, We are revising the power section of our machines to allow the use of 110VAC or 230VAC single phase for domestic and international use. We already use switching power supplies so DC power output is not an issue. We also use a an AC gearmotor that runs on line voltage. To address the...
  2. kjoiner

    One Wheel recall

    One Wheel has to recall all of it's units. Apparently if it detects an overspeed or power issue it shuts off regardless of how fast you are going. https://www.cpsc.gov/Recalls/2023/Future-Motion-Recalls-Onewheel-Self-Balancing-Electric-Skateboards-Due-to-Crash-Hazard-Four-Deaths-Reported
  3. kjoiner

    Switching mains power for Shcuko type plugs with no polarity in a control panel

    Hello, We are revising a control panel for a machine to work with 110VAC or 220VAC. The machine plugs into a wall outlet. The panel uses 3 DIN mount switching power supplies. In the US, we can use single switches or breakers to cut power to each power supply because the hot and neutral are...
  4. kjoiner

    Near disaster on United Flight Boeing 777 leaving Hawaii -any ideas?

    Hello, I recently saw some articles about a near crash of a Boeing 777 leaving the he Kahului airport in Hawaii. The plane took off, reached an altitude of 2200 feet then descended at 8600 feet per minute. It dropped to 775 feet off the water when the pilots recovered. The articled then...
  5. kjoiner

    Futuristic home tips over

    I just saw this on an engineering newsletter...
  6. kjoiner

    UL regulations for smaller NEMA stepper motors (23 and 34 sizes)

    Hello, I am considering some smaller stepper motors for an application. All our equipment is certified to UL 751 and FCC part 15. I would like to find out if stepper motors fall into a category that requires UL testing. I have asked the lab that performs our testing but they are not familiar...
  7. kjoiner

    How are quick links manufactured?

    Hello, I was sourcing some quick links for an application the other day and out of curiosity started thinking about how these are manufactured. I have not come up with a method so I thought I would ask here. The requirements for the threads seem to be: 1. Aligned axially so the "gate"...
  8. kjoiner

    Welding surface hardened 1045 steel shaft to mild steel plate

    Hello, I have an application where I need to weld a hardened shaft to a mild steel plate (10 ga CRS). The plate will attach to an extruded tube. The shaft supports the plate and tube but the hardened surface is necessary for use with a drawn cup roller bearing (i.e. one way clutch bearing -...
  9. kjoiner

    Identifying original drawing vs. copies

    Hello, For years, we used a stamp that said "ORIGINAL IF RED" to identify the original drawing released by engineering. It was easy to identify a copy because the red ink would be black on a copy. With the advent of color copiers, it will now be more difficult to determine what is original...
  10. kjoiner

    "Dark zone" in middle of screen on Cadkey 99

    Hello, I've got a strange issue with Cadkey 99. I'm running it on Windows 10 (it still works!) but the problem I've run into seems to be related to the monitor. I had a Samsung 25" monitor that worked fine. A while back, I upgraded to a ViewSonic 27" monitor. Now I get a rectangular area in...
  11. kjoiner

    Drivability issues in 2014 Honda Accord EX V6 - related to VCM or 6 speed trans?

    Hello, I've posted this question in an Accord forum, but I wanted to see if anyone here has better information of suggestions. I have a 2014 Honda Accord EX V6. This car has a 6 speed automatic and also has VCM. Since I bought the car, I have notice a few really irritating behaviors that...
  12. kjoiner

    Checking the moment diagram shape for fixed/fixed beam with 2 point loads

    Hello, This should be a basic question but I want to double check my moments so I can size a frame member and I haven't done this in a while. I have a beam, fixed on both ends, 87" long with 2 point loads at 29" and 58". Each point load is 543 lb downward. In reality, my point loads are...
  13. kjoiner

    Galling between acetal and HDPE? Other material choice?

    Hello, We have an application the involves sliding doors that are spread apart by a linear actuator mechanism. The spreader mechanism works by engaging two toggle arms to the doors and spreading them apart by 5.5 inches. The doors slide on stainless steel rods in the door frame and also ride...
  14. kjoiner

    Beam deflections due to moments created by casters

    Hello, It's been a while since I've worked through beam calculations that are more than the standard conditions so please go easy. I have a shelf with 4 leveling feet and a 500 pound load sitting on top of two rails that have 2 swiveling casters each. For simplicity I'm looking at one side...
  15. kjoiner

    acetal causing wear on steel guide rod in sliding application

    Hello, We have redesigned an aluminum part with nylon 66 bushings to a single piece acetal part. This part slides on a guide rod made of 1144 steel that is zinc plated. There is about 60lb of radial force on the acetal part and it slides back and forth 2.75 at a low speed. During the testing...
  16. kjoiner

    Cannot delete solid part in Cadkey 99 model

    Hello, I still run Cadkey 99 for legacy parts. I imported a linear rail bearing block and today it started acting up. The block will not render which indicated to me that there is some issue with the part. I tried to delete the part from the model and it won't delete. I've tried...
  17. kjoiner

    Turning a shoulder on a SSTL 3/8 lead screw

    Hello, I hope this is the right forum. I use a Ø3/8, 1/2" lead, 4 start screw made from 300 series stainless steel in a linear actuator. My local machinist is having trouble turning a shoulder on the screw. He tells me that the screw chews up carbide inserts and has recently switched to...
  18. kjoiner

    Best welding rod for aluminum to be anodized

    Hello, We have 2 extrusions that must be welded together and then anodized. Eventually this will be tooled as one extrusion but we are doing some field testing. I searched for the best welding rod to use so that no smut will form on the weld during anodzing but I have seen two opposite...
  19. kjoiner

    Take a look at this article

    Hello, I was handed a magazine the other day with an article about a guy who is putting Duramax diesels etc. in Hummers and using Hydrogen injection to create some astronomical performance figures in power, fuel economy and emissions. I'm an M.E. and read this forum for personal interest so I...
  20. kjoiner

    Extrusion of delrin

    Hello, We currently use some machined blocks of delrin to guide a door bar up and down some rods in a machine we produce. The blocks are currently machined and are quite expensive. Right now, we don't make high volumes of parts, but even then, we use outside vendors and pay accordingly. The...

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