Bulldog44[TK] Posted April 13, 2016 Report Share Posted April 13, 2016 (edited) Update March 2018- For anyone still interested in any progress on these scopes,etc. please go to my Facebook Bulldog Props Page. Due to the photobucket fiasco, I haven’t found a reliable way to post pics so I am using the Facebook page for now. https://www.facebook.com/BulldogPropsJapan/ When first I started my E-11 build I really wanted to make the Doopy resin scope look as real as possible. I thought buying a real scope at the time was expensive and better suited for a Sterling conversion which is not possible to own in Japan. So I studied all the great mods members here on the FISD did to make their resin scopes better than just a solid cast replica. I quickly decided that I wanted my resin scope to have clear lenses and be hollow to allow light to pass through, meaning I had to drill out the center. With only a simple hand drill and some wood drill bits I did my best to bore a hole through the scope without putting one through my hand. Luckily no trip to the hospital was needed. The next step was to try and find a proper sized lens to fit on both ends. Installing them is not always a easy and clean procedure either. It was a challenge to mod the scope but I think it was one of favorite parts to work on.<br> That experience led me to wanting a real scope so I managed to buy one ......... then I bought a few more. Having some real scopes in hand, I thought it would be fun to try and cast a scope that wasn't solid but hollow. I wanted to make this part of the E-11 build easier to work with without having to do major surgery and allow for easier ways to add lenses and screws, etc. Casting the whole scope from one end to the other limited access to install the lenses so I thought it would be better to cast all the parts separately. There are very thin walled parts and delicate details to capture making it a bit difficult to do but after some trial mold making and casting I was able to get decent enough results to post. I have had a lots of great advice & feedback from some super FISD members so any success in this project is thanks to them- you know who you all are! Thanks guys! In the photos you will notice the scope parts are all mixed up shades of grays. Partly because I was experimenting with adding black pigment into the resin and also so its easy to see that all the parts are separate pieces. The resin I am using is from a Japanese model making company and is ideal for casting small parts. It actually has some flexibility to so its not as brittle as other resins I have seen. Again, this project is still in development and more materials and procedures need to be tested. The scope's main body is slush casted so getting even walled castings each time is a skill I haven't mastered yet. A rotational casting machine would be great but money, space, and skills to build one are not in cards at the moment. I am literally making these scopes on the floor in a space no bigger than a square meter or so. Parts seen in photos are from my third mold making trial. Little bit of seam cleanup on the main scope body and random flashing on some smaller parts. Just to clarify the scopes are not 100% hollow after casting. The center of the scope needs to be punched out or drilled depending on the thickness, not difficult at all. The end where the smaller lens unit is attached needs to be drilled or opened. The walls of the scope in general are sufficient and sturdy enough, nothing cracked when I applied some minor pressure. I can't say how resistant they are to added pressure or being struck. I think they are somewhat fragile but certainly stronger than my drilled out Doopy scope. There is threading on the casted retainer rings and inside the scope so the parts can actually be screwed on much like the real scopes. Its not always a perfect fit but this should make it easy to install lenses and then screw on the retainer rings to keep it in place. Painting the parts might make the parts fit a bit tighter but that is far from being tested at this point. The smaller lens unit still has all the holes where hardware should go, an easy 1,2,3 to drill them out and install real screws. The scope feet still have visible mounting screw holes as well. In the photos (bottom page-second from the left) you can see the ring part that houses the lenses on both ends. I have to cast these parts with the lenses to avoid damaging the real parts. It is a partial casting as well since it might be difficult to fit the whole part if casted as it actually is. You really only need the front ring section, the opaque lenses need to be removed and clear optics can be mounted behind the ring. This may make it easier to install slightly different sized lenses, nothing needs to be exact to ring hole opening (just slightly bigger than the opening of course!)- the outer rim of the lens will be hidden by the ring. <br><br> One problem I found out was that not all the M38 scopes are perfect copies of one another. I have casted the large and small retainer rings from another M38 scope but they fit rather loose. And strange enough the lens rings are a bit oversized. Perhaps there is some distortion when casted. After a few more tests I should be able to determine if all the casted parts for one particular scope will fit together without any issues. The last part to cast is still in the works but I will leave that for another post in the future if it works out as I hope.<br><br><img src="http://i300.photobucket.com/albums/nn37/Bulldog44USA/Bulldog%20Props%20Hall-ow%20M38%20Scope%20Test%20Phase/Bulldog%20Props%201942%20M38%20Hollow%20Core%20Scope/IMG_0245_zpsmxq23bpy.jpg"alt="IMG_0245_zpsmxq23bpy.jpg"><br><br> Sorry for the long story about these scopes but hope you get a better idea of whats involved in this project. Its been a year of reading up, months of planning (mostly me staring at an M38 in the midnight hours losing sleep) and a month of silicone & resin tests. Thanks for reading and stopping by! Edited March 25, 2018 by Bulldog44 12 Quote Link to comment Share on other sites More sharing options...
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