Актуальные проблемы отечественной истории

Task: It is necessary to develop an accurate 3D model (in STL format) of a two-component box for storing bank coin rolls. The box consists of a bottom part (base with cells) and a deep top lid. Main requirements: Configuration: A box with a square grid of cells 5x5 (a total of 25 rolls). The appearance is similar to the attached photo example but recalculated for 25 slots. Box dimensions: The overall external dimensions of the closed box must be strictly 160 x 172 x 72 mm. Cell sizes and ergonomics: The model is designed for rolls with dimensions: diameter — 24 mm, height — 62 mm. The diameter of the cells should include a technological clearance (approximately +0.5 mm) so that the rolls fit freely. Important: The depth of the cells in the lower block must be such that the inserted roll protrudes from the bottom of the box upwards by 15–16 mm (i.e., the depth of the cells is about 46–47 mm). The top lid must be deep enough inside to completely cover this protruding part of the rolls when the box is closed. Construction and hinges (for STL): Rounded external vertical corners of the box (as in the photo). Integrated hinges on the back wall with a through coaxial hole diameter 3 mm for assembling the halves of the box using an M3 screw or pin are needed. No fastenings or recesses for a latch on the front wall are needed — the front panel should be solid and flat. The texture of roughness is NOT needed. In your responses, please indicate the final cost for the work and estimated completion time. I need two finished STL files (base and lid) as a result. Thank you! Note: The attached photos are taken from an open advertisement as a visual example (reference) of the design. I do not need an exact copy of someone else's product — it is necessary to develop an individual model from scratch strictly according to my dimensions (for 25 cells) and without fastenings for a lock.

Development of a mechanism for alternating the flipping of plastic cupsProject Goal It is necessary to develop only the mechanism for flipping plastic cups "every other one" for an automatic production line. The device must ensure the following sequence: 1st cup — without flipping (0°) 2nd cup — flip 180° 3rd — without flipping 4th — flip 180° and so on. As a result, the output should produce the sequence: 0° → 180° → 0° → 180° → ...What is already available The cups move along the conveyor in a single row. Before the mechanism, all cups have the same orientation (lid up). Only the flipping unit needs to be developed.Proposed Operating Principle The following scheme is considered: A dividing screw synchronizes the flow of cups. All cups gradually rotate to the position of 90°. Then, the cam mechanism acts only on every second cup. Every second cup returns from the position of 90° back to 0°. The others continue rotating to 180°. As a result, we get: 0° 180° 0° 180° If the performer offers a simpler, more reliable, or more technological solution — we are ready to consider it.Requirements1. Develop a complete 3D model in SolidWorks It is necessary to model: dividing screw; flipping mechanism; cams; guides; shafts; mountings; all necessary parts.2. Perform kinematic verification It is necessary to ensure that: the mechanism operates without jamming; there are no intersections of parts; the cups are flipped correctly; the mechanism is suitable for manufacturing.3. Conduct Simulation / Motion Study It is necessary to perform an animation of the mechanism's operation in SolidWorks Motion. It should be visible: the movement of the cups; the rotation of parts; the sequence of flipping every second cup.Work Result The performer must provide: source files SolidWorks (*.SLDPRT, *.SLDASM); assembly; Motion Study; animation video; STEP file of the assembly; drawings of the main parts.

It is necessary to make an analysis of the project (drawing) of the advertising installation with a description. Dimensions: Width: up to 2.25 m Height: up to 2 m Depth: up to 1 m

packaging solutions / flexible packaging). It is necessary to develop a prototype of a two-chamber packaging for a food product. Idea: The packaging consists of two separate chambers with different ingredients. Upon strong compression of the packaging, the internal partition should controllably break, after which the contents of the two chambers mix. The user then shakes the packaging and opens it for consumption. Requirements: Develop the packaging design. Select materials and production technology. Create a working prototype. Prepare the packaging for mass production. If necessary, assist in finding a manufacturer. Preferred experience: Flexible packaging (sachet, doypack, flow-pack, etc.). Development of custom packaging solutions. Food products or dietary supplements. Understanding of film welding technologies and creating breakable internal partitions. Example concept — BOOMSHOT packaging (in the photo): two chambers that mix upon compression.

TECHNICAL TASK (TT)For the design and calculation of a large frame aquarium structure1. GENERAL INFORMATION AND PURPOSE Product type: Large demonstration frame-type aquarium. Purpose: Public/private interior aquarium for keeping hydrobionts. Objective: Development of design documentation (DD) for the manufacture of a metal frame, selection and calculation of the thickness of multilayer glazing (triplex), design of the base with waterproofing nodes, as well as calculation of elements for transportation by forklift.2. GEOMETRIC AND WEIGHT PARAMETERS External dimensions of the structure (L×W×H): 4000 × 1800 × 1400 mm. Height of the water column (maximum): To be structurally accepted as equal to 1300 mm (taking into account technological underfilling). Configuration: Rectangular basin with a 360° view (all 4 vertical sides — transparent glazing). Weight limitation (dry weight): The maximum weight of the fully assembled finished product (metal frame + installed glazing + bottom elements) must not exceed 3000 kg (3 tons). This is a critically important condition for ensuring logistics and the lifting capacity of rigging equipment.3. TECHNICAL REQUIREMENTS FOR CONSTRUCTIVE ELEMENTS3.1. Metal Frame (Structure) Type of construction: Spatial welded frame made of steel profile with a continuous perimeter fixation for each glass. Each of the 4 glasses is a separate panel glued into the quarter (groove) of the metal frame on 4 sides. Stiffness: The structure must have maximum stiffness against bending and twisting. The deflection of load-bearing elements under full static load must not exceed permissible values to avoid the occurrence of peak local stresses in the glass and adhesive joints. Supports: Provide supports for precise leveling and even weight distribution on the foundation/base. They may be non-adjustable.3.2. Glazing (Vertical Walls) Material: Multilayer laminated glass (triplex) based on tempered or float glass of increased transparency (type Optiwhite). Optiwhite Perform strength calculations for hydrostatic pressure. Determine the final safe formula for triplex (layer thickness and type of polymer film — PVB / SentryGlas), ensuring minimal weight with required strength. SentryGlas Calculate the depth of glass embedding in the frame and parameters of the deformation adhesive joint.3.3. Bottom of the Aquarium and Transport Nodes Base construction: Rigid frame base of the metal structure, covered with moisture-resistant sheet material (moisture-resistant plywood/composite). Bottom waterproofing: Finish coating with specialized PVC membrane ("pool foil"). Forklift clearance: The lower beam of the frame must have a structural clearance from the floor of at least 100–120 mm for unobstructed entry of forks. Pockets for the forklift: Design through guide pockets (slots) in the structure of the pallet for standard dimensions of heavy forklift forks. The pockets must pass through the entire frame for the possibility of lifting the product from either of the two long sides (4000 mm).4. CALCULATIONS AND LOADS (MANDATORY PART) The designer must provide verified calculations (including finite element method — FEM / FEA) on the following points: Hydrostatic load: Calculation of the pressure of the water column up to 1300 mm on the vertical walls and bottom (total water volume about 10,000 liters, operational weight ~10 tons). Glass strength calculation: For bending and strength considering the safety factor for frame-type aquarium constructions (not less than 3.0–4.0). Metal frame calculation: Static calculation of the filled aquarium for stiffness and deflection. Adhesive joint calculation: Selection of parameters and thickness of structural silicone/polyurethane for shear and pull-off under water pressure. Weight audit and optimization: If the total dry weight of the metal frame and calculated triplex exceeds 3 tons, measures must be taken to lighten the structure (use of high-strength steel grades with reduced profile cross-section, optimization of triplex structure, use of lightweight composites for the rough bottom).5. REQUIREMENTS FOR THE DOCUMENTATION TO BE ISSUED (DD) After the design is completed, the contractor provides: An explanatory note with calculations of the strength of the frame, glazing, and rigging nodes. Assembly drawings of the metal frame (marks KM/KMD) with a specification of metal products. Drawings of details and cutting maps of bottom elements. Detailed drawings of connection nodes: "glass — metal" "glass — damper — adhesive" "sealing of the joint PVC membrane bottom — glass — frame" "pockets for the forklift" A specification of all materials (steel grade, exact triplex formula). A 3D model of the product in a neutral format.