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  • Prfesser commented on seamster's instructable Make Your Own Kraft Paper Tubes1 month ago
    Make Your Own Kraft Paper Tubes

    Hi, about 20 years ago I wrote a pamphlet on making spiral-wound paper tubes, very similar to your methods. It's currently sold by Apogee Components: https://www.apogeerockets.com/Rocket_Books_Videos/...Like qdogg, I found that gummed kraft packing tape works best. It's often made from virgin kraft which is stronger than the recycled stuff. It doesn't wrinkle significantly (a BIG plus, let me tell you!). Tubes of almost any length can be made---cutting a strip of kraft paper more than 3-4 ft long with parallel edges is something of a chore. And it's quite cheap---$7 for a 600 foot roll of 3" wide, which works nicely for tubes over 1.5" diameter.http://www.dickblick.com/products/kraft-paper-tape...2" wide and even 1.5" wide tapes can be found on eBay and Walmart:h...

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    Hi, about 20 years ago I wrote a pamphlet on making spiral-wound paper tubes, very similar to your methods. It's currently sold by Apogee Components: https://www.apogeerockets.com/Rocket_Books_Videos/...Like qdogg, I found that gummed kraft packing tape works best. It's often made from virgin kraft which is stronger than the recycled stuff. It doesn't wrinkle significantly (a BIG plus, let me tell you!). Tubes of almost any length can be made---cutting a strip of kraft paper more than 3-4 ft long with parallel edges is something of a chore. And it's quite cheap---$7 for a 600 foot roll of 3" wide, which works nicely for tubes over 1.5" diameter.http://www.dickblick.com/products/kraft-paper-tape...2" wide and even 1.5" wide tapes can be found on eBay and Walmart:https://www.walmart.com/ip/Pacon-Pre-Gummed-Self-A...A few hints from my own experience:--A layer of waxed paper, with ends scotch-taped to the mandrel, and/or a little talcum powder (talc, not cornstarch) makes it easier to get the tube off the mandrel. Careful: tape doesn't stick well to wax paper and it's easy to wrinkle the wax paper while winding.--As you pointed out, the tube shrinks when drying. For near-perfect sized tubes, use a double layer of waxed paper and talcum on the mandrel. Slide the finished tube off, a little more talc on the mandrel, then slide it back on to dry. Usually it will shrink to a tight but still-can-get-it-off fit. If it is still too tight, three layers of waxed paper.--Tubes much over 2' long may warp a bit after they're made. Winding layers in opposite directions helps some, though it's tedious.--For you rocketry nuts, 1/2" EMT conduit is just about right for 18 mm (BT-20) tubes. 3/4" EMT is a bit small for 24 mm (BT50) but can be built up with a few layers of tape. 1" conduit is about right for 29 mm tubes.

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  • Prfesser commented on geotek's instructable Building an Aztec Drum1 month ago
    Building an Aztec Drum

    Had a woodworker friend make one for my wife's birthday. Wish I had had this 'ible back then, I'd have made it myself. Well done!For a bit of verisimilitude, wrap the rubber balls in a small disk of chamois (found in automotive department, used to wash/dry car) and tie around the drumstick with a thin leather strip or a string. Adds to the realism.

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  • Prfesser commented on Joerg Engels's instructable Raspberry Cheese Cake Without a Base1 month ago
    Raspberry Cheese Cake Without a Base

    That looks wonderful! One question: what is Quark? I don't think we have it in the US.

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  • Prfesser commented on rdzisaac's instructable Renew Your Outlets1 month ago
    Renew Your Outlets

    My understanding is that twisting the wires and covering with electrical tape is only permitted by code if the wires are soldered/brazed/welded.

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  • Prfesser commented on J_Calder's instructable Caliper Calibration2 months ago
    Caliper Calibration

    Be aware that some dial calipers have a knurled knob that, when loosened, allows the entire dial to rotate. Close the caliper, loosen the knob, rotate the dial so that the pointer is on zero. Tighten the knob. Of course, as you point out, this leaves the zero in a position other than 12 o'clock...

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  • Prfesser commented on primerdome's instructable Basic DIY Woodglue Photoemulsion4 months ago
    Basic DIY Woodglue Photoemulsion

    Please note: this Instructable says "chromate" in one place and "dichromate" in another. It should be "dichromate" according to the bottle in the first image.

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  • Prfesser commented on als_liahona's instructable Build a High Power Rocket Nozzle5 months ago
    Build a High Power Rocket Nozzle

    I know this is an old 'ible but for the benefit of those who haven't read it before...Nozzles made with Durham's water putty work okay with "sugar" propellant and blackpowder. They do NOT work well with ammonium perchlorate composite propellant, especially if the propellant contains any metal as a fuel. Sugar propellants burn at about 3000F; APCP with aluminum, in excess of 5000F. And exhaust from APCP contains a lot of hydrogen chloride (hydrochloric acid= hydrogen chloride dissolved in water). You can imagine what 5000F hydrochloric acid does to almost anything...FWIW I have attempted nozzles for APCP motors using water putty, plaster of paris, portland cement, clay (molded to shape and kiln-fired before use), graphite powder mixed with epoxy, and a number of other materi...

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    I know this is an old 'ible but for the benefit of those who haven't read it before...Nozzles made with Durham's water putty work okay with "sugar" propellant and blackpowder. They do NOT work well with ammonium perchlorate composite propellant, especially if the propellant contains any metal as a fuel. Sugar propellants burn at about 3000F; APCP with aluminum, in excess of 5000F. And exhaust from APCP contains a lot of hydrogen chloride (hydrochloric acid= hydrogen chloride dissolved in water). You can imagine what 5000F hydrochloric acid does to almost anything...FWIW I have attempted nozzles for APCP motors using water putty, plaster of paris, portland cement, clay (molded to shape and kiln-fired before use), graphite powder mixed with epoxy, and a number of other materials and mixtures. With APCP, fired clay erodes but not too badly if the propellant doesn't contain aluminum or magnesium. Graphite powder mixed with a resorcinol glue is about as good as commercial phenolic nozzles (e.g., Aerotech), though the glue shrinks a lot.Bottom line: for APCP, machined graphite is far and away the material of choice.Best regards -- Terry

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  • Prfesser commented on Batmantwo's instructable Glass Like Finish on Wood5 months ago
    Glass Like Finish on Wood

    It's a good idea to level the piece very carefully before pouring the resin, for an even coat.

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  • Prfesser commented on Davida675's instructable How to Make an M&M Anti Gravity Cake6 months ago
    How to Make an M&M Anti Gravity Cake

    I didn't get what this was at first from the thumbnail, but...INGENIOUS! Well done!

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  • Prfesser commented on mikeasaurus's instructable 5 Ways to Remove a Stripped Screw7 months ago
    5 Ways to Remove a Stripped Screw

    You can purchase left-hand drill bit sets with corresponding screw extractors. The bit cuts in the opposite direction of a normal drill bit; sometimes, just drilling into the screw with a left-hand bit will remove it. If not...that's what the extractor is for. Check out eBay:http://www.ebay.com/itm/10PC-SCREW-EXTRACTOR-EASY-OUT-LEFT-HAND-DRILL-BIT-/290556839769?hash=item43a6898759:g:Vf8AAOSwepJXYJOR

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  • Prfesser commented on StephanP1's instructable Beam Compass8 months ago
    Beam Compass

    Simple and very useful! Commercial 'trammel points' are rather expensive; this is a great alternative!

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  • Prfesser commented on Bruceputman's instructable 12" Disc Sander8 months ago
    12" Disc Sander

    VERY nicely done and illustrated, and a beautiful project! (Personal opinion: All too many Instructables have only a video. I know they're easiest to prepare but they simply can't tell the whole story. I no longer even bother to view the video-only Instructables. SO glad to see detailed photos instead!)

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  • Prfesser commented on ineverfinishanyth's instructable DIY Metal Stamping9 months ago
    DIY Metal Stamping

    Nicely done!A suggestion: aluminum beverage cans are made by pressing in stages:http://www.my.all.biz/img/my/catalog/25321.jpegI don't know how practical it would be to make an intermediate die of shallower depth...Also, the aluminum and die are well-lubricated before pressing. Might cut down on the tearing.

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  • Prfesser commented on fred.lam.5201's instructable Tangential Tool Holder for Taig Lathe10 months ago
    Tangential Tool Holder for Taig Lathe

    Marvelous! Time for me to dig out a chunk of aluminum from my scrap box and get to work! Thank you!!

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  • Unexpected result during fire resistance test (final test)

    Grog is already-fired clay. You can make grog by grinding up ordinary ceramic flowerpots.

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  • Prfesser commented on asemery's instructable Snow Shovel Hack11 months ago
    Snow Shovel Hack

    As someone who had back surgery a couple of years ago...thank you! If we get snow this year I'll definitely try this.

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  • Toilet Roll Dispenser/Holder - Hot Off the Press

    Nicely done! I can see a practical advantage to this gadget. When the roll runs out, you still have the paper that's running on the spindles to use; it'll do until you can get another roll.

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  • Prfesser commented on bobcatsteph3's instructable Seedless Black Raspberry Jam1 year ago
    Seedless Black Raspberry Jam

    Black raspberry flavor is way above either blackberries or red raspberries. I have a few quarts of frozen Pennsylvania wild black raspberries that my sister gave me a couple of months ago. Looking forward to making your recipe!

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  • Prfesser commented on FelisC's instructable How to generate high-level radiation1 year ago
    How to generate high-level radiation

    X-rays only. Gamma rays and beta particles are from nuclear decay.

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  • Prfesser commented on cyann04's instructable Authentic Hamburger Gravy1 year ago
    Authentic Hamburger Gravy

    Here's a typical recipe. Buttermilk is a cultured product, similar to but thinner than yogurt. http://www.food.com/recipe/southern-buttermilk-biscuits-26110

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