SKC Posted June 15, 2019 Share Posted June 15, 2019 Hello all, since paper hemispheres are not available here & I don't intend to use plastic balls, I had to make paper hemispheres of my own. I've made a few & they're quite ok. I am keen to learn 3 strip shell pesting technic which will be required after I build the shell. Searched my best at net but couldn't find any; well descriptive. Hence, my request to seniors to help me on this. Thanks in advance. Link to comment Share on other sites More sharing options...
Arthur Posted June 15, 2019 Share Posted June 15, 2019 ANY "method" of pasting a shell is simply a method of getting the same thickness of paper over all of the shell when paper is flat but a ball is NOT! There are also methods of making cylinder shells that are simplified by the simpler shape of a cylinder vs a sphere. Link to comment Share on other sites More sharing options...
Sulphurstan Posted June 15, 2019 Share Posted June 15, 2019 Hello all, since paper hemispheres are not available here & I don't intend to use plastic balls, I had to make paper hemispheres of my own. I've made a few & they're quite ok. I am keen to learn 3 strip shell pesting technic which will be required after I build the shell. Searched my best at net but couldn't find any; well descriptive. Hence, my request to seniors to help me on this. Thanks in advance. NeighborJ once posted a video of continuous pasting: quick, efficient. The day I saw his video, I never used another method anymore; for me, it is just THE good way of pasting.Just try it out, and see. Link to comment Share on other sites More sharing options...
kaotch Posted June 16, 2019 Share Posted June 16, 2019 I absolutely agree with sulpherstan. Do use NeighborJ 's way of pasting as the "3 strip pasting " method is very unreliable. Link to comment Share on other sites More sharing options...
Fulmen Posted June 16, 2019 Share Posted June 16, 2019 I assume you're referring to this one: https://www.amateurpyro.com/forums/topic/12011-shell-pasting/?p=175069 Link to comment Share on other sites More sharing options...
Sulphurstan Posted June 16, 2019 Share Posted June 16, 2019 Yep! Link to comment Share on other sites More sharing options...
Fulmen Posted June 17, 2019 Share Posted June 17, 2019 It does look efficient. I have trouble understanding how it can produce a uniform thickness, but I'm sure it works. It also look harder to dial in the right thickness, so it's perhaps best suited for the more experienced pyros? Link to comment Share on other sites More sharing options...
Sulphurstan Posted June 17, 2019 Share Posted June 17, 2019 Fulmen.Forget about experience!I'm only 4 years in the hobby, so not that much experienced: the method is easy for anybody who is handy, and believe me, with this method, the Breaks are .... Round& symmetric, Everytime!. Regarding the equal thickness, IMHO the trick is to have the right ratio between the width of the tape, and the shell diameter. Sometimes, you can see a VERY slight over thickness in the equator area (typically when I use 22 mm width tape on a 3 inch shell/ and not, when I use a 25 mm width tape)... NeighborJ could probably tell you more details... Link to comment Share on other sites More sharing options...
Fulmen Posted June 18, 2019 Share Posted June 18, 2019 4 years is well beyond novice in my book (depending on activity of course). The more traditional methods have a couple of benefits IMHO. First of all it's easier to dial in the break when you can add single layers. You also have a better chance of getting help with any problems. Once you get good, consistent breaks with these you should be able to adopt new methods without much trouble. Link to comment Share on other sites More sharing options...
BetICouldMake1 Posted June 18, 2019 Share Posted June 18, 2019 I think you'll find Neighbor's method no more difficult than 3 strip pasting. In my opinion the 3 strip method is actually harder to get right, and if you're going to spend the time practicing a technique you'd be better served starting with one that is going to yield superior results when mastered. Yes, it's easier to add single layers using the 3 strip method, but how well can you add those layers evenly? When dialing in a break you're somewhat limited in terms of pasting, too little and you have a poor fit in the mortar, too much and it doesn't fit at all. Yes, you have a fair margin in either direction, but for me it's easier to have a consistent pasting method and then tweak the break charge if necessary. Link to comment Share on other sites More sharing options...
NeighborJ Posted June 18, 2019 Share Posted June 18, 2019 I've not had any issues finding a proper mortar fit with the 3 ring method. I have had inconsistent results with uneven paste layers with disk pasting and strip pasting due to loosing my place or bunched up paper. Link to comment Share on other sites More sharing options...
Arthur Posted June 18, 2019 Share Posted June 18, 2019 In the USA, Stanley the tool makers do (or did) supply some tape measures with a diameter scale on the back. Intended for timber logging, they measured circumference in the usual way but the rear side was marked with the diameter of a circle of that circumference. 1 Link to comment Share on other sites More sharing options...
Fulmen Posted June 19, 2019 Share Posted June 19, 2019 Just to be clear I haven't tried the 3-strip or Neighbor's method. I like the method Shimizu describes (8 strips per layer). My argument is simply that Neighbor's method is fairly new and not widely adopted. So if you're having problems you'll have a harder time finding people to help you. Link to comment Share on other sites More sharing options...
dlking59 Posted June 19, 2019 Share Posted June 19, 2019 Fulmen can you point me in a direction where I can get more info on Shimizu's method. Link to comment Share on other sites More sharing options...
Fulmen Posted June 20, 2019 Share Posted June 20, 2019 (edited) This one covers most methods (including the 3-strip method): Shimizu's technique is thoroughly covered in his works: Edited June 21, 2019 by Mumbles Link to comment Share on other sites More sharing options...
SKC Posted June 20, 2019 Author Share Posted June 20, 2019 Thanks to all. Following is the link(Thanks to nighthawkinlight again) which has guided me to construct paper hemisphere. https://www.youtube.com/watch?v=PvsY8By5NEE I'll continue this process or adopt NeighborJ's process for finall wrapping. Link to comment Share on other sites More sharing options...
rellim Posted June 20, 2019 Share Posted June 20, 2019 Videos demonstrating use of gummed tape:https://www.youtube.com/watch?v=3rHOQIcHKVohttps://www.youtube.com/watch?v=NFMI8qE11aY Video of "Maltese" disk method:https://www.youtube.com/watch?v=EjDkyrSEWUc I sometimes use the neighborJ pattern using cut strips and then bring to final diameter with a layer of disks. When pasting on lower latitude you may find it helpful to paste a circle onto the pole to serve as a guide. Link to comment Share on other sites More sharing options...
Fulmen Posted June 20, 2019 Share Posted June 20, 2019 For hemis I use the method David Bleser describes in "Round Stars and Shells" (it also covers Shimizu's method of pasting). Basically it uses two strips of newspaper laid in a baseball pattern. Since it only uses two identical strips per layer it's very efficient. Link to comment Share on other sites More sharing options...
Mumbles Posted June 21, 2019 Share Posted June 21, 2019 This one covers most methods (including the 3-strip method): Shimizu's technique is thoroughly covered in his works:I edited your post. Please refrain from posting illegal pirated material here. Those works are still under copyright and able to be purchased. Link to comment Share on other sites More sharing options...
Fulmen Posted June 21, 2019 Share Posted June 21, 2019 My bad, I just picked it off Google without thinking. Won't happen again. Link to comment Share on other sites More sharing options...
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