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  • vettebob commented on mikeasaurus's instructable Drill Press Drum Sander10 months ago
    Drill Press Drum Sander

    Thanks. I will bore a hole in some 3/4" plywood for a snug, press fit for the bearing, and glue the bearing in. On the through bolt of the sanding drum, at the bottom, I will add a collar, or spacer that will be a slip fit into the i.d. of the bearing. In my case, I will just machine the spacer/collar on the lathe. For those unable to do this, you should be able to scrounge a 3/8" drive socket wrench of the right o.d. to serve as the spacer/collar.Vettebob

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  • Hand Built Portable Bluetooth Speaker

    Thanks so much for your answer. I know what capacitors are and do, I just wasn't sure of the purpose here. Some have complained of noise/interference from the power supply using these amps, with varying degrees of success using capacitors to combat the problem. In my case, I am going to use this power filter: "Crazepony L-C Power Supply Filter 2A 16V Input Reverse Polarity Protection for FPV Racing Quadcopter."Vettebob

    Yes, do be careful with them. It was really as if I had been shot! The sound was as loud as a 22 pistol, and the impaact hurt like crazy. I don't know how to post pics here, but I have a "selfie" of my busted lip. Thank god it didn't hit my eye!! Polarities were correct; voltage was a regulated 12 volts. When I was adjusting the pot, it suddenly exploded the output capacitor. Subsequent research showed that this has happened to others. Use caution with them, and it wouldn't be a bad idea to replace that cap with one of 50 volts or more. It also wouldn't hurt to "cycle" that potentiometer fully in and out, then position it midway before you ever apply voltage to it. In any case, keep the board facing AWAY from you when first powering it up and while adjustin...

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    Yes, do be careful with them. It was really as if I had been shot! The sound was as loud as a 22 pistol, and the impaact hurt like crazy. I don't know how to post pics here, but I have a "selfie" of my busted lip. Thank god it didn't hit my eye!! Polarities were correct; voltage was a regulated 12 volts. When I was adjusting the pot, it suddenly exploded the output capacitor. Subsequent research showed that this has happened to others. Use caution with them, and it wouldn't be a bad idea to replace that cap with one of 50 volts or more. It also wouldn't hurt to "cycle" that potentiometer fully in and out, then position it midway before you ever apply voltage to it. In any case, keep the board facing AWAY from you when first powering it up and while adjusting it. The darn thing almost gave me a heart attack!!Vettebob

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  • Hand Built 26 Watt Portable Bluetooth Speaker

    What is the purpose of the three capacitors you added in the circuitry please?Thanks!

    On mine, I am using computer fan "Finger Guards" over the speakers, because I KNOW if I don't, one of my daughters little cousins fingers will find their way right through those speakers!!

    Very nice. I was already building something similar for my daughter. A WORD OF CAUTION FOR EVERONE!! Be VERY careful when adjusting the step up modules!! Wear face protection and keep the board/capacitors facing away from you. Two days ago, one of these exploded and pieces severely cut my upper lip, right through my mustache! Between the sound of the explosion and the impact, I thought I had been shot! Researching the device, I found this has been known to happen sometimes. The potentiometer can be sketchy, and while being adjusted can suddenly cause the unit to over volt, and explode the output capacitor. I am not saying don't use it, but if you do be very, very careful.

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  • vettebob commented on mikeasaurus's instructable Drill Press Drum Sander10 months ago
    Drill Press Drum Sander

    Genious!! Love it! I am going to make several in different diameters and multiples of the same size to have pre-loaded with different grit sandpaper. Thanks! Great Instructable!

    It is true that drill chucks don't play well with lateral loads, but if you tighten the chuck well from all three points it should be ok with moderate side loads. When I build mine, I am going to make a base with a bearing in it that will clamp or bolt to the drill press table.Vettebob

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  • Homemade Aircraft for Under $1000 (FlugTag Style)

    I would DEFINITELY like to see more info on the use of this craft in a recreational aspect besides Flugtag. I imagine many prople would. Like towing it behind a boat and flying it just for fun. Or motorizing it with a small gasoline engine to fly around the country side as a ground effect plane.Possible follow up info???Thanks for sharing this fun project.

    I'm a dedicated gearhead/engine guy. Also a pilot and an Ultralight aircraft instructor. There's a place down in Mexico I frequent thst has a huge, sheltered bay that is often dead flat. Also hundreds of square miles of flat sandy beaches at low tide. All PERECT for a ground effect airplane. I am very interested in this.I was thinking something along the lines of one of the popular "Predator" line of gas engines available at quite good prices from Harbor Freight. No battery weight, recharging out in the oonies, etc....I will be watching your progress with interest, and if I can help in any way, let me know. I design and build large scale R/C planes, and have built full scale ultralights and GA experimental planed. (Homebuilt Category)Hey, here's a thought! Have a loo...

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    I'm a dedicated gearhead/engine guy. Also a pilot and an Ultralight aircraft instructor. There's a place down in Mexico I frequent thst has a huge, sheltered bay that is often dead flat. Also hundreds of square miles of flat sandy beaches at low tide. All PERECT for a ground effect airplane. I am very interested in this.I was thinking something along the lines of one of the popular "Predator" line of gas engines available at quite good prices from Harbor Freight. No battery weight, recharging out in the oonies, etc....I will be watching your progress with interest, and if I can help in any way, let me know. I design and build large scale R/C planes, and have built full scale ultralights and GA experimental planed. (Homebuilt Category)Hey, here's a thought! Have a look at DLE and RCGF engines for Giant Scale R/C planes. For example, the DLE 120 twin makes 12 horsepower, generates 50 lbs. of thrust, and weighs only SIX pounds total. Two of those would be more thrust than my old 1982 full size ultralight plane had. I weigh 200 lbs., and I flew it at density altitudes of 7000 feet!Vettebob

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  • vettebob commented on TheNecromancer13's instructable 79cc Motorized Bicycle From Scratch10 months ago
    79cc Motorized Bicycle From Scratch

    What a detailed and cool Instructable. Nice work. Ever since I saw that cute little Predator engine in HF the other day, I have been thinking of doing this. Since I am a fabricator/welder, I would probably make the engine plate, etc., and weld them to the frame. I figured on definitely using pedal assist to get started. I had done some fast and dirty calculations and thought that a 10 tooth/72 tooth setup without a jackshaft would be ok, and give about a 40 mph top speed with a 26" tire. I'll have to check my calculations again!! (I think I was figuring a 3500 rpm max on the engine as shown in the specs for it. What do you run it at??) I would like the engine to be quiet and not revving very high at around 30 mph.Thanks so much!

    Also, I had figured on using the factory cooling system. Not a good idea???Thanks!

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  • vettebob commented on abzza's instructable Tales From the Chip: LM386 Audio Amplifier11 months ago
    Tales From the Chip: LM386 Audio Amplifier

    I have a tiny microphone taken from a set of headphones with mike. Would that mike drive this amp? Also, how would you add volume control to this amp. (I want to use a mike, into a small amp, into headphones. I need high, but controllable gain.)Thanks, and nice instructable!!

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  • vettebob commented on BruceP28's instructable Toy-Drop Camper11 months ago
    Toy-Drop Camper

    This is a really nice unit, and well done. I think I would have made the front addition slighly larger. I also would have added a 12 volt electrical system, had a charging connection to the tow vehicle, and used some efficient and cheap LED lighting inside. But yeah, I like it! Might have to make something like it to haul my giant scale R/C planes around and take my daughter camping.How much did the trailer itself cost you to buy?Nice job!Vettebob

    They make a Hot Knife that can be bought cheap that works great for cutting foam, or you can easily make your own hot wire cutter to use with a battery charger.

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