efrimann
Private
Have anyone seen an antitank gun replica used in a softair games? If so, where? What does such a thi
Posts: 57
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Post by efrimann on Feb 2, 2015 17:14:53 GMT -5
A small videoOnly a small entertainment video as I haven't fisnished the prototype yet. Plan to finish it in inexpensive MDF to see if the parts really fit.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Feb 2, 2015 22:54:31 GMT -5
Let us know how that goes! Cool project. What are your next three steps and when will you have them completed? i find on my projects if I don't write out each step and give myself a deadline they don't get done. what internals and feed system do you plan to use? Building a mock Machine gun and tripod even from assorted thicknesses of ABS is a very ambitious undertaking even a non functioning prop.
Your video combining the CAD drawings and actual Vickers show all the tiny details required to make it look good. Years ago Schmitty on these boards made an all metal Vickers which fired spectacularly and reliable and would be hard to tell from the pictures you showed. His machine gun belt hid the wires that lead from his batteries which were housed in the ammo box. Below the feed tray cover was a trough that held about 2500 BBs which were electrically fed using mostly components from a highcap magazine.
He even had the leather over the water jacket. The gun was both tripod portable and vehicle mounted. i don't ever remeber it going down. His craftmanship is superb. Looking forward to you turning big ideas into big projects that can support our hobby.
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efrimann
Private
Have anyone seen an antitank gun replica used in a softair games? If so, where? What does such a thi
Posts: 57
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Post by efrimann on Feb 3, 2015 4:20:43 GMT -5
These are the 3 first steps:
First step: Deciding on how to implement the airsoft internals, use of external electric magazine or not, designing a noise-recoil-and-move-the-toggle-engine, getting the nessecary parts together. Deadline: Ultimo february.
Second step: To control that my procedures of turning a 3D design to flat cutting stensils are simple enough to do, that printing on a normal A4 printer works flawlessly and then probably redesign a few parts to be better suited for laminated ABS (or perhaps cheaper and eaisier MDF). Deadline: Mid March.
Third step: With all cutting stensils present and counted, spray-gluing them to the chosen material. First a test to see how tight I can fit the stensils on each sheet of material. Photos. Assemble wooden prototype with internals, figure out new strongpoints, correct 3D drawnings to reflect 'experience' and changes. Fit new parts as designed, keep doing this until drawn parts are the ones that work.
Then further steps. Let's see if the plan holds with less than a two-week-slack.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Feb 3, 2015 12:03:45 GMT -5
Perfect! we'll monitor your progress like a weight loss coach!
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efrimann
Private
Have anyone seen an antitank gun replica used in a softair games? If so, where? What does such a thi
Posts: 57
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Post by efrimann on Mar 7, 2015 18:21:55 GMT -5
Well, there has been some bad disease in the near family and besides I have been procrastinating for ever and ever, but I am now ready to glue my Vickers .303 design to the boards and start cutting. I was fighting for hours on end trying to make nice straight flat drawings when I discovered I didn't have to: Google Sketchup prints 1:1 very nicely without it, it only cost me a bit more paper - and that's way cheeper than my time under the circumstances. So it may be one full A4 sheet for one little thing to stick on.. Oh, well.
Anyway, I have decided to build my Vickers prototype out of 3mm and 6mm MDF for the simple reason that it is quite cheap and easy to shape. For larger box-like parts I'll use 6mm waterproof plywood, MDF for details only. For moving parts either mild steel or some sort of heavy duty plastic or plexiglass for sturdiness. 6mm ABS is rather expensive in this part of the word - as I suspect it is everywhere - but I intend to finish the build completely with gearboxes, barrels, electric magazines etc.
The design of the noise-box will be simple: A small box, with a little platform in the end to hold an electric motor and a battery. The axle is prolonged with a small length of the rubber tube used for bicykle tire valves (whatever they're call in English) and the other a small screw with a lead weight - long enough to hit the four walls to make a stacato noise. Maybe a stepless resistance to regulate speed. I just have to make a duplicate switch mechanics to close the curcuit for the noise box. It should be simple to build and repair. I tried it, and it made a delight noise and scared the cat out of town, but it also ripped itself to shreds. Thicker walls, or some sort of composite build.
The recoil is alas reduced to some sort of blow back on the togle, only with the handle moving, not the inner workings sliding back and forth. Something simple, but space is getting cramped. I'll figure it out later, using a long push rod of some sort.
Many Vickers have corrugated steel barrel jackets, and I think I'll cheat by using the canvass heat cover to hide most, and only do the grooves in either end. Also, this makes parallel lines a little less crucial.
My collection is growing regardsless. I just stripped an AGM MP40 from all paint, trying to make a battleworn specimen using real bluing, adding a little cosmoline and grit. And I got my hands on a SRC MP40 and fixed the gearbox and blowback - and amde a test converting AGM lowcap mags, they seem to work better. Also preparing to 'decorate' an MP44 to look like the one in our Arms Museum in Copenhagen: Much more white steel than one should have imagined. And coarser wood furniture. Oh, yes - and a Marushin M1 Garand at a very good price. Completely useless, but it looks great.
So I am - as it were - just soldiering on, perhaps not quite within the two week slack.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Mar 7, 2015 20:22:01 GMT -5
When you say "noise box" are you making the vickers as a prop or functioning airsoft gun? Glad to hear your Armory is growing. I'll bet the artificial aging on the purchases came out real nice.
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efrimann
Private
Have anyone seen an antitank gun replica used in a softair games? If so, where? What does such a thi
Posts: 57
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Post by efrimann on Mar 8, 2015 4:00:36 GMT -5
Full working airsoft, using either ver.2 or M249 gearboxes. At one point I toyed with the idea of making them work with press.air only (no gearbox or any moving parts) and then I thought I need more than just the hissing sound. So it's both, I think. Just adding a little for the boys (me). I have photos of the MP40 shortly.
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