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  • Telescope motorization (focus + orientation)

    Thanks Hugo ; These are the pictures I needed! the part you made is a "set-screw" lock. And I will likely do exactly same, I did finc local Hobby shop that serves the ?Drone? community here and they have a commercial "coupler" which is used in 3D printing steppers to fix to the threaded linear shaft. The item looks like this but its just right diameter for my motor shaft and can be drilled for the larger size of the Microscope (or telescope). In fact, the owner has a few on order that connect 2.5mm to 3.4mm on the other side...I upload an image; The Shop sells the item at $10 in store but I found the same item on Ebay Canada for $6. You can see four "set screws" which use Allen Key locking method... If the two items do not work, I will use your method, usin...see more »Thanks Hugo ; These are the pictures I needed! the part you made is a "set-screw" lock. And I will likely do exactly same, I did finc local Hobby shop that serves the ?Drone? community here and they have a commercial "coupler" which is used in 3D printing steppers to fix to the threaded linear shaft. The item looks like this but its just right diameter for my motor shaft and can be drilled for the larger size of the Microscope (or telescope). In fact, the owner has a few on order that connect 2.5mm to 3.4mm on the other side...I upload an image; The Shop sells the item at $10 in store but I found the same item on Ebay Canada for $6. You can see four "set screws" which use Allen Key locking method... If the two items do not work, I will use your method, using Keyhole drill to make round. The same shop also sells that Buki gear set...many thanks for reply. John in Canada

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  • DIY Bench Power Supply With Old Computer SMPS

    Steve;Please remind viewers to use only UL listed, classed Power Supply modules. I did not see UL symbol/stickers but I see the obvious safety label on one side. I noticed that the remote enable is used, by pulling the PS_ON# pin to ground, but the power supply still operates internally, in a sleep mode.Even when an ATX is disconnected from the IEC310 power cable, the PCB switch-mode capacitors are still somewhat charged, and can painfully remind any fingers of that (residual) charge.Always check that the IEC310 receptacle has a low resistance connection to the case, and that the binding post rear insulators are used to isolate the high current DC connections. Perhaps , ring-spade crimp terminals should be used at the rear of the binding posts, but I am encouraged to see many of your pr...see more »Steve;Please remind viewers to use only UL listed, classed Power Supply modules. I did not see UL symbol/stickers but I see the obvious safety label on one side. I noticed that the remote enable is used, by pulling the PS_ON# pin to ground, but the power supply still operates internally, in a sleep mode.Even when an ATX is disconnected from the IEC310 power cable, the PCB switch-mode capacitors are still somewhat charged, and can painfully remind any fingers of that (residual) charge.Always check that the IEC310 receptacle has a low resistance connection to the case, and that the binding post rear insulators are used to isolate the high current DC connections. Perhaps , ring-spade crimp terminals should be used at the rear of the binding posts, but I am encouraged to see many of your preparations and treatments, in your pictures, actually enhance safety and isolation/insulation. Perhaps, you have formal Electronics training.Modification of ATX modules is the most affordable way to create a test benchpower supply. If there is an unintentional short in the 3.3V, 5V or 12V D.C. rail(s) we hope that the feedback monitor shuts down that ATX PS per the conventional wisdom , by disabling the switchmode drive.[ CET in 1979]

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  • Telescope motorization (focus + orientation)

    Hugo, thank you for sharing this useful instructable. John R.I have a similar project for servo focus control using same 28YBJ-48 motor and re-use of printer-paper-pickup tire(s) as the mechanical coupling to the focal knob (IN / OUT) , that will not 'jiggle' the target objective every time it is rotated.I am interested in your mechanical geared tooth coupling method. Can you share some detail on sourcing parts, and coupling methods to the 28YBJ shaft other than hot melt ThermoPlastic?Do you find that there is 'lashing play' within the gears and if so, is there a pronounced effect on movement?I can share that the tires have varying grip at different room temperatures,a typical focus 'race' has a latency or 'lag' in the linear movement.USB microscope images are processed with a large no...see more »Hugo, thank you for sharing this useful instructable. John R.I have a similar project for servo focus control using same 28YBJ-48 motor and re-use of printer-paper-pickup tire(s) as the mechanical coupling to the focal knob (IN / OUT) , that will not 'jiggle' the target objective every time it is rotated.I am interested in your mechanical geared tooth coupling method. Can you share some detail on sourcing parts, and coupling methods to the 28YBJ shaft other than hot melt ThermoPlastic?Do you find that there is 'lashing play' within the gears and if so, is there a pronounced effect on movement?I can share that the tires have varying grip at different room temperatures,a typical focus 'race' has a latency or 'lag' in the linear movement.USB microscope images are processed with a large noticeable delay,which is mildly annoying as the stepper motor is stepped IN and OUT to inspectElectronic PCB and component failures at different focus settings.My next project uses another Arduino-Stepper pair to move the USB microscope (stand base) on X and Y.I observe there is not enough power (500mA) in one (PC) USB port to power *two* of the 28YBJ types under 'load', so the 'base' movementwill have ACDC external power and likely at 12Vdc. I sketched an Ardi C++ that accepts two momentary keys (IN and OUT), a rotary potentiometer for step delay(speed) , driving off the shelf ULN2003 stepper driver board(s). That Ardi program also controls the IN OUT over 9600Baud serial remotely,using 'i' and 'o' characters and I eliminated the pot to adjust the speed remotely.USB Microscope prices are decreasing to the point where every QA inspectionbench should have this tool.I am looking for mechanical coupling advice.I also have round electronics control knob hardware from the 80's that have two allen set-screws but the shaft is loose and off center when affix to 28YBJ shaft.best regardsJohn

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  • TheRadMan commented on seamster's instructable Tennis Balls in a Bottle (How-to!)4 months ago
    Tennis Balls in a Bottle (How-to!)

    Stress ball squeeze; think angry thoughts...

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  • TheRadMan followed danielknox5 months ago