Thread started by Treehugger
TreehuggerIdea, for creating a rifled barrel, the easier way (as I imagine it):
1) Start with thin sheet of styrene, and eventually place that curved, and inside a hollow plastic barrel.
2) Add rifling, using thin styrene strips on a FLAT piece of thin styrene sheet
3) Place the customized sheet of styrene inside a hollow barrel, and create slight twirl.
4) Glue in place along that one seam, the whole way down through the barrel, and maybe glue on front/end as well..
5) Then.. saw the barrel to length and clean up.
Accurate placement of strips of styrene can be made, by filling the width of the sheet styrene with strips, glue on every other one, then remove the "spacers" to "create" the rifled grooves.
Does this sound like a plan or not? 🙂
This way, one can also get to paint the inside rifling, with a metallic color before placing it inside a cylinder!
Uuh, perhaps another way to create rifling, could be to scribe into plastic, but perhaps very very tricky to get proper parallel lines, ofc, slight errors might be unnoticable, practically speaking.
The Dora gun barrel has 96 + 96 grooves iirc. 96 top fins, and 96 grooves.
Hm, in order to get proper shape to the grooves, I could very gently sand the grooves with some tool, to avoid the "fins"/"grooves" being simply square shaped in cross section.
1) Start with thin sheet of styrene, and eventually place that curved, and inside a hollow plastic barrel.
2) Add rifling, using thin styrene strips on a FLAT piece of thin styrene sheet
3) Place the customized sheet of styrene inside a hollow barrel, and create slight twirl.
4) Glue in place along that one seam, the whole way down through the barrel, and maybe glue on front/end as well..
5) Then.. saw the barrel to length and clean up.
Accurate placement of strips of styrene can be made, by filling the width of the sheet styrene with strips, glue on every other one, then remove the "spacers" to "create" the rifled grooves.
Does this sound like a plan or not? 🙂
This way, one can also get to paint the inside rifling, with a metallic color before placing it inside a cylinder!
Uuh, perhaps another way to create rifling, could be to scribe into plastic, but perhaps very very tricky to get proper parallel lines, ofc, slight errors might be unnoticable, practically speaking.
The Dora gun barrel has 96 + 96 grooves iirc. 96 top fins, and 96 grooves.
Hm, in order to get proper shape to the grooves, I could very gently sand the grooves with some tool, to avoid the "fins"/"grooves" being simply square shaped in cross section.
All comments (8) » 21 October 2019, 15:19
TreehuggerNo problem, the idea here is to just create the inner barrel, then an outer barrel is placed over the inner one. The outer barrel would be more massive at the end.
Update: Ah, one issue. The Evergreen styrene strips are not 40+ cm long. Hrm. I guess I could try hide the seams in the middle of the barrel. Strips are max 35 cm long or something like that.
21 October 2019, 17:14
TreehuggerUgh, another problem: What does 69 + 69 strips of styene cost? Quite a lot! Actually, too much.
138 / 10 in each pack x say $4 = an awkward sum of $112, and I would probably need 50% more because each strips won't cover the lenght of the barrel, lol. Ah, shucks!!! This was such a fun idea. I am back to thinking of scribing the rifling, much cheaper. Another fun idea is to fill a barrel with putty, and then drag a styrene shape with the rifling pattern though it.
Hm with 96 grooves to be scribed, I think it might be a good idea to do the lines as halves of a total length, to avoid incremental measuring errors. E.g second scribe is half the distance of 96 fins, being 2 every 48 fins, next being 4 every 24 fins, next being 8 every 12 fins, next being 16 every 6 fins, next being 32 every 3 fins. Then, eventually there would be 32 pairs of grooves that has to be scribed to finish, but having no impact on general accuracy if the left of the grooves are more precise.
Btw, I noticed that Plaststruct has 0.01 x 0.01" square strips, but they are much shorter than the Evergreen ones. I've also seen that Plaststruct's styrene rods being uneven in width, which isn't comforting. plastruct.com/shop/strip-and-rod/90709-ms-10/ Expected cost = ca $131 plus shipping. 🙁 Just too much.
21 October 2019, 17:51