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  1. SailplaneDriver

    A new attempt at making piston rings

    Damn. You guys just put me down the rabbit hole of Circularity vs. Roundness.
  2. SailplaneDriver

    Webster Flywheel Question

    Thanks Brian. I was wondering what people did to keep the center from slipping. I was considering a shrink fit but wasn't confident it would have sufficient holding power for the cyclical loads.
  3. SailplaneDriver

    Webster Flywheel Question

    I did some calcs on the bronze ring vs. the design flywheel. The moment of inertia of the bronze ring will be about 4 times that of the original design. That sounds a bit on the high side. I think I'll dig around some more and see if I can scrounge up something else. Maybe a trip to WalMart and...
  4. SailplaneDriver

    Webster Flywheel Question

    I'm getting ready to start on a Webster and I hope to tap into the experience of others who have built one and have much more experience that I do. I don't have any 3.75" steel or cast iron laying around for the flywheel but I do have a beautiful bronze ring 4.75"OD, 3"ID, .866 thick. It's a...
  5. SailplaneDriver

    Model generator build from scratch

    My answer is correct. Here is the formula from Alternating Current Machines by Puchstein, Lloyd and Conrad first published in 1936. This is the 1954 edition. The output frequency is inversly proportional to the number of poles in a generator or alternator. Same for the RPM. Now think of it...
  6. SailplaneDriver

    Model generator build from scratch

    Output frequency will be Number of Magnetic poles times RPM divided by 120. For a 16 pole machine running at 1000 RPM you will get 133 Hertz output.
  7. SailplaneDriver

    Meh - Just a little clean up

    Out by Redmond, WA for me. We should have a PNW get together - well, when things calm down.
  8. SailplaneDriver

    Mini diesel engine.

    When I was working, an expert was anyone wearing a tie from 100 miles or more away.
  9. SailplaneDriver

    A better mill?

    I know what you mean. I'm blessed with a very deep 3 car garage. You could always buy a new home (just kidding). Just getting my mill off the pallet was a real exercise let alone moving it into the corner. There is no way I would try and move that thing up or down stairs.
  10. SailplaneDriver

    A better mill?

    I sold my Horror Freight mini mill and purchased a PM-835S and haven't looked back. It was the smallest knee mill I found and It is way larger than I really need; but it also is much more robust allowing me to be more precise. At 1500 lbs (680 kg) it is quite heavy and difficult to move. All...
  11. SailplaneDriver

    Igaging products

    I had lost the locking screw on an iGaging digital caliper. I contacted them and purchased a replacement without any problem but that was roughly 5 years ago.
  12. SailplaneDriver

    Igaging products

    I had similar problems with one axis on my old mini-mill, since sold. I converted the mill to a DRO using Yuri's Touch DRO and stopped having problems leading me to believe that the issue was the electronics and not the scale. I again had the problem with the scale I added to the mini-lathe...
  13. SailplaneDriver

    Shrink fit

    Here is a shrink fit calculator. Plug in the data and it will tell you more than you want to know including required pressure to fit the parts for a given temperature differential. https://amesweb.info/press-fit/interference-fit-calculator.aspx
  14. SailplaneDriver

    7/16-14 tpi allen head bolt

    Where are you located? Tacoma Screw covers most of the northwest and they have had pretty muchy anything I have ever needed.
  15. SailplaneDriver

    Arduino Rotary Table for Dummies

    Aliexpress. Look for post #46 in this thread. Everything will fit but it is tight. I used industrial double stick tape to hole the boards to the bottom of the case. The display will center in the existing cutout if you modify the two top holes in the board to match the position of the screws...
  16. SailplaneDriver

    Arduino Rotary Table for Dummies

    As promised, here are pictures of the finished product after I got the electronics sorted. It now works well. All the electronics in the case with the keyboard and display.
  17. SailplaneDriver

    Arduino Rotary Table for Dummies

    I haven't seen any posts as to how to mount the stepper to the rotating table. I have a 6" Phase II and chose to use a clamping system on the shaft housing. Here are the drawings for what I did. An alternative is to make a solid plate instead of the mount on sheet 2 and attach it like you would...
  18. SailplaneDriver

    Arduino Rotary Table for Dummies

    Does anyone know about the color codes for the "Run" led? I have seen it flash yellow when receiving data and stepping the motor and now solid red.
  19. SailplaneDriver

    Arduino Rotary Table for Dummies

    Except that was not the case here. The system was not energized when the motor was disconnected. The stepper control board had been previously powered without a motor connected for testing purposes several times without issue and was still able to operate the motor afterwards. The only issue...
  20. SailplaneDriver

    Arduino Rotary Table for Dummies

    I got mine to work. Then I went to put the controls in a box like Maxmekker50. I used a 4-pin aircraft style plug so I could disconnect the stepper from the controller box. I tested it prior to connecting the motor and everything seemed to work fine. The "Run" led on the TB6560 flashed yellow...
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