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ajg193

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Posts posted by ajg193

  1. Shrink fits are legit.

    About 4 or 5 years ago I had to design an extrusion container for making magnesium rods, the container needed to be made of multiple shells of high strength (H13) steel that are shrink fitted together to get enough strength.

     

    The shrink fit was used to put something like 600 MPa of compressive stress on the inner liner, giving almost 2000 MPa of pressing capacity. I think it was something like a 0.15mm interference on about a 53 mm diameter sleeve, required temperature difference was about 250 or 300C to get it to all fit together. Was quite stressful as the liner was about 150mm long and had a nitrided surface so any lathe tooling would just bounce right off if it grabbed and needed to be redone.

    image.png.df4f55c462574cddec53814fbaa5cedf.png

     

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  2. 12 hours ago, Bling said:

     

    The pay ones are always good to go. $3-3.50ish for ~30km for me. I have two transactions around that price because it tends to put in 4-4.5kWh in the time it takes me to grab something in supermarket and be on my way. I can only get sub 50% of what the pump can pump though because worn out battery life. Can get free at my local supermarket, but need to BYO cable. Given the cost of the cable it would take me a long time to recoup costs due to onboard charger being limited on AC compared to DC which is straight in the veins. 

    Heck that's expensive. At what point does it make someone an inconsiderate prick when their worn out old car is blocking a charger for a long time due to reduced charge acceptance?

  3. 18 hours ago, Bling said:

    I don't see how a quality (IMO) brand will under cut a cheaply made China car. Time will tell I guess. Way too small for me, but more options = betterer.

    Are you always driving around with four kids in the back or something? I bet 90% of your trips would be perfectly suited to this car

    • Like 1
  4. On 01/02/2024 at 06:43, yoeddynz said:

    Yeah I'd thought about them ages ago. But I actually want to go electronic on the speedo. I'd have to start swapping innards... 

    Smiths gauges look 10x better than the ones earlier in the thread, no idea on the cost though

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