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Difference between revisions of "Manual shearing machine for 3mm plate"

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|firstin=https://www.youtube.com/watch?v=Oz5MzN0Pc_M
|firstin=https://www.youtube.com/watch?v=Oz5MzN0Pc_M
|trans_status=WT
|trans_status=WT
|desc=<!-- <p>Based on the DIN 2221 standard, among others, OHO has established a series of stages in which the satisfactory completion of this project was carried out</p> -->
__TOC__
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|licence=CCBYNCSA40
|typeproject=Youtube
|typeproject=Youtube
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|contains_pdf_drawings=yes
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<!-- |cmpimage=oho_ddb_Test1.png -->
|cmpimg=
The cutting shears boast a unique design made possible through thorough research of online videos and incorporation of repurposed car leaf springs that underwent a heat treatment. The end result is a durable yet environmentally conscious tool capable of handling challenging metal cutting tasks with ease.
}}
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<!-- * Workshop [[File:Review.png|20px|link=https://en.oho.wiki/index.php?title=Talk:Manual_shearing_machine_for_3mm_plate&action=edit&section=new&preloadtitle=Technical_development_5.1]] <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]] -->
<!-- * Workshop [[File:Review.png|20px|link=https://en.oho.wiki/index.php?title=Talk:Manual_shearing_machine_for_3mm_plate&action=edit&section=new&preloadtitle=Technical_development_5.1]] <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]] -->
<!-- * Workshop [{{fullurl:{{TALKPAGENAME}}|action=edit&section=1&showtitle=1&preloadtitle=Technical_development|class=linksPopups}} Comments] <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]] -->
<!-- * Workshop [
<!-- * Workshop [[File:Review.png|20px|link={{fullurl:{{TALKPAGENAME}}|action=edit&section=1&showtitle=1&preloadtitle=Technical_development-Workshop|class=linksPopups}}|Comments]] <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]] -->
{{fullurl:
{{TALKPAGENAME}}|action=edit&section=1&showtitle=1&preloadtitle=Technical_development|class=linksPopups}} Comments] <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]] -->
<!-- * Workshop [[File:Review.png|20px|link=
{{fullurl:
{{TALKPAGENAME}}|action=edit&section=1&showtitle=1&preloadtitle=Technical_development-Workshop|class=linksPopups}}|Comments]] <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]] -->
* Workshop <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]]
* Workshop <br> Determination of the workshop for manufacturing: <br> Among the most important aspects to be fulfilled by the manufacturing workshop, we have: [[File:pdc_workshop3.jpg|300px|thumb]]
** It does not require industrial or specialized processes such as plastic processing, CNC machining, complex chemical processes, among others
** It does not require industrial or specialized processes such as plastic processing, CNC machining, complex chemical processes, among others
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|matspec=Angle 1 1/2*1 1/2"*4mm, steel A36
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|matspec=Plate 1 1/2*3/16", A36 steel
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|matspec=Plate 16mm, steel A36
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|matspec=Flat bar 1 1/2*3/16", steel A36
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|matspec=Square bar 1/2", steel A36
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|matspec=Square bar 1/2", steel A36
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|matspec=Leaf spring 10mm, steel 9260, optional 13mm
|matspec=Leaf spring 10mm, steel 9260, optional 13mm
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|matspec=Leaf spring 10mm, steel 9260, optional 13mm
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|matspec=Hex bolt 1/2*2 1/4" NC
|matspec=Hex bolt 1/2*2 1/4" NC
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|matspec=Hexagonal screw 3/8*1 1/8" NC, optional l 1" hexagonal screw
}}{{ProjektMaterials
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{{ProjektMaterials
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|matspec=Flat washer for 1/2" NC
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|matspec=Round bar 3/4", A36 steel
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Revision as of 20:07, 20 April 2023

Project data

Category: Shears

URL (first publication): https://www.youtube.com/watch?v=Oz5MzN0Pc_M

Keywords: cutting, shear, diy, metal, machine, workshop, open source, spring steel, hardening

License: CC BY-NC-SA 4.0

Organization: OHO

Project status: Active

Certification status: In process


Maturity of the project: prototype


Contains PDF-drawings: Yes

CAD files are editable: Yes

Assembly instructions are published: Yes

Bill of materials is published: Yes







no

yes yes 








  Oho cm3 foto1.jpgOho cm3 001.pngOho cm3 002.pngOho cm3 003.pngOho cm3 004.pngOho cm3 005.pngOho cm3 006.pngOho cm3 007.pngOho cm3 015.pngOho cm3 016.pngOho cm3 026.pngOho cm3 027.png

Project details

Description

The cutting shears boast a unique design made possible through thorough research of online videos and incorporation of repurposed car leaf springs that underwent a heat treatment. The end result is a durable yet environmentally conscious tool capable of handling challenging metal cutting tasks with ease.

Technical documentation

PDF plans

Oho cm3 002.png 
Files:

Oho cm3 cizalla-manual-para-plancha-3mm 0.96.pdf


CAD files

Oho cm3 render2.png 
Files:

oho_cm3_STP-files.zip
oho_cm3_DWG-files.zip
oho_cm3_CAD-files2.zip


Project development

Based on the DIN 2221 standard, among others, OHO has established a series of stages in which the satisfactory completion of this project was carried out

1. Feasibility study

  • Materials, components

    Required materials & components can be sourced or replaced locally?
    ✓ Yes
    All the materials can be located with some ease, in hardware stores, parts stores and/or junkyards

    Previous theoretical case, showing the exploded view
  • Manufacturing processes

    Required manufacturing processes can be povided locally?
    ✓ Yes
    In a small workshop, all the processes required for manufacturing can be achieved

    Example showing the processes involved
  • Specific training

    Is specific training for manufacturing necessary and can be provided?
    ✓ Yes
    Especially when it comes to heat treatment for the blades

    Cutting blades
  • Sustainability

    Do all materials and processes meet the sustainability criteria?
    ✓ Yes
    It is observed that both the materials used and the manufacturing processes are sustainable from an economic, social and environmental point of view

    Sustainability concept

2. Market analisis and requirements

  • Market analysis
    Analysis of the current products on the market:

    Sealey 3s/6r metal hand shear cutter cropper 13mm round 6mm cutting

    Oho cm3 YEqdlJHwmiE.jpg

    * Price [USD]: 237
    * Source: ebay
    * Country: USA
    * Machine condition: New
    * Maximum sheet thickness [mm]: 6
    * Maximum round bar diameter [mm]: 13
    * Cutting length [mm]: 180
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes

    5" Length Sheet Metal Plate Cutting Bench Hand Shear Machine Toolsmillar

    Oho cm3 C5nvVqsjo9Q.jpg

    * Price [USD]: 243
    * Source: ebay
    * Country: USA
    * Machine condition: New
    * Maximum sheet thickness [mm]: 4.08
    * Maximum round bar diameter [mm]: 11.11
    * Maximum thickness of plate or angle [mm]: 4.08
    * Cutting length [mm]: 127
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes

    Manual Sheet Cutter Somar N4 Tesoura

    Oho cm3 NYKOsfqPCC0.jpg

    * Price [USD]: 100
    * Source: mercadolibre
    * Country: Venezuela
    * Machine condition: New
    * Maximum sheet thickness [mm]: 4
    * Cutting length [mm]: 240
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes

    5 Inch Sheet Metal Shear Plate Construction Type Mount

    Oho cm3 TLlFCBbGhaU.jpg

    * Price [USD]: 363
    * Source: mercadolibre
    * Country: Venezuela
    * Machine condition: New
    * Cutting length [mm]: 160
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes

  • Requirements definition
    Definition of the main technical data (size, capacity, power...):
    • Maximum sheet thickness [mm]: 3
    • Maximum round bar diameter [mm]: 13
    • Maximum plate or angle thickness [mm]: 5
    • Cutting length [mm]: 150-180

  • Optimal functions and features:
    Definition of necessary/optional functions and features
    • High hardness steel blade: Shear is required to have hardened steel blades
    • To screw on a metal bench: It is preferred that the machine includes its own support structure

3. Search & analisis DIY technologies

  • OHO Search engine

    Customization of the OHO search engine
    A search for similar or related equipment was carried out in our repository, obtaining some equipment that can be used as a reference

    Oho cm3 search1.jpg

  • Manual search
    Searches were also performed within Google, Youtube, special websites etc., getting, among others, the following results:

    * Title: Homemade shears for sheet cutting
    * Views: 280000
    * Likes: 4900
    * Comments: 285
    * Maximum sheet thickness [mm]: 3
    * Maximum thickness of plate [mm]: 3
    * Cutting length [mm]: 205
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes
    This example will be used as the main reference machine

    Oho cm3 3l5sapINxAM.jpg

    * Title: Leaf Spring HACK - Metal Cutter
    * Views: 486000
    * Likes: 5800
    * Comments: 162
    * Maximum sheet thickness [mm]: 2.5
    * Maximum thickness of plate [mm]: 2.5
    * Cutting length [mm]: 200
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes

    Oho cm3 ZLxexHEj-yU.jpg

    * Title: Homemade metal shear
    * Views: 331000
    * Likes: 3200
    * Comments: 123
    * Maximum sheet thickness [mm]: 3
    * Maximum thickness of plate [mm]: 3
    * Cutting length [mm]: 130
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes

    Oho cm3 YEqdlJHwmiE.jpg

    * Title: Manual Sheet Shear
    * Views: 236000
    * Likes: 4600
    * Comments: 215
    * Maximum sheet thickness [mm]: 3.6
    * Cutting length [mm]: 200
    * High hardness steel blade: Yes
    * To screw on a metal bench: Yes

    Oho cm3 QrTWE0wVggk.jpg

  • Networking
    This section refers to contacting partners, associated organizations and experts
    Since the cases found on the internet provide enough information, it was not necessary to search for reference equipment in this way, it can be useful when working with unusual equipments

4. Development & documentation

  • Analisis of functions & structures

    From analyzing the operation and parts of the main reference machine and the rest of the examples obtained, a first list of components for the shear is generated

    Oho cm3 dt1.jpg

    During this process, some measurements of the parts and assemblies, essential for the design, are extracted

    Oho cm3 dt2.jpg

  • Technical solutions

    The OHO development team also proceeds to design and determine the engineering problems that arise, in order to obtain a quality product that can be manufactured with Appropriate Technologies

    Oho cm3 dt3.jpg

    One of the solutions generated by the technical team was the inclusion of some bushings in the joints, this to ensure that these joints do not get stuck and enough tightening to support the loads

    Oho cm3 dt5.jpg

  • Technical documentation

    There is an internal and self-managed Gitlab repository, where the preparation of plans, exploded views, the final parts list, details and annotations, among others, are controlled at a formal and technical level

    Oho cm3 gitlab1.jpg

  • Peer-Reviews

    Before continuing with manufacturing, a group of experts was convened to verify the plans and generate observations, in order to optimize the design and prevent errors during later stages

    Oho cm3 dt4.jpg

5. Manufacturing, tests and improvements

  • Workshop
    Determination of the workshop for manufacturing:
    Among the most important aspects to be fulfilled by the manufacturing workshop, we have:
    Pdc workshop3.jpg
    • It does not require industrial or specialized processes such as plastic processing, CNC machining, complex chemical processes, among others
    • It has basic tools for working with metal and wood at a non-industrial level
    • It has measuring instruments appropriate to the processes, such as: vernier, tape measure, thread counter, gauges, etc.
    • Includes painting equipment such as compressor and spray gun
    • It is a space large enough and ordered for manufacturing, assembly and painting operations
    • It has qualified personnel in basic and intermediate works with metal, wood, painting, among others
    • Some parts or processes that are not available may be purchased or ordered from more specialized stores and workshops
  • Purchase
    Purchase of materials and components:
    From the list of parts, the amounts of materials to be required from local suppliers were totaled
    Oho cm3 materials-list1.png
    • Structural profiles
    • Fasteners
    • Special profiles
    • Metal plates
    • Consumables
  • Tests and improvement
    Module tests, system tests, improvement of components:
    Some tests were carried out on the equipment, to verify the correct adjustment of the parts and the efficiency in its operation.
    Oho cm3 wtest1.jpg
    • Lateral slack: Apply moderate force on the lever, from left to right and vice versa, alternately. The plates do not tilt
    • Example of real use: Making cuts of the samples of plate and sheet
    • Visual detail of the cut: Straight shape of the cut, Straight edge, no burrs
  • Updates of technical documentation
    Updates of plans, parts lists, assembly instructions:
    • The main plates (2.1 to 2.3) were manufactured in a thickness of 12mm, which is sufficient, instead of the 16mm initially proposed
    • Modification in the length of the bushings, according to the new plate thicknesses
    • Pieces 2.5 and 2.6, manufactured in 1/2" square bar, available in the workshop
    • Mobile blade (piece 2.7), with dimensions adjusted according to the leaf spring piece achieved, recovered material
Plans are expected to be updated with these changes, in order to have accurate information regarding the equipment manufactured

6. Certification DIN Spec 3105

  • Formal audit
    Verification of the completeness of the documents:
    Oho cm3 gitlab2.jpg
    • Parts list
    • Drawings of all parts and assemblies
    • Assembly instructions
    • Optional documents, technical notes
In the image, it can be seen that this verification is complete, except for the previous corrections, which refer to the final update of the blueprints
  • Assignment of reviewers
    Search and assignment of peer-reviewers with sufficient expertise:
  • Peer-reviews
    Realization of the peer reviews, technical clarification, improvements: In process
  • Certificate
    Issue of the certificate: In process


+ General Reviews General Reviews

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Reviews

Pos. Qty. Part Name Part code Part Type Specifications Review Status Show All Comments
A1 1 3D views

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A2 1 Exloded 3D views

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B Parts list

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1.0 1 Table structure

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1.1 2 Table angle Production Angle 1 1/2*1 1/2"*4mm, A36 steel

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1.2 2 Table side angle Production Angle 1 1/2*1 1/2"*4mm, A36 steel

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1.3 2 Table front angle Production Angle 1 1/2*1 1/2"*4mm, steel A36

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1.4 2 Table back leg angle Production Angle 1 1/2*1 1/2"*4mm, steel A36

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1.5 2 Table reinforcement angle Production Angle 1 1/2*1 1/2"*4mm, steel A36

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1.6 1 Angle2 table reinforcement Production Angle 1 1/2*1 1/2"*4mm, steel A36

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1.7 4 Anchor plate Production Plate 1 1/2*3/16", A36 steel

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2.0 1 Shear body

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2.1 1 Lower base plate Production Plate 16mm, steel A36

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2.2 1 Support center b Production Plate 16mm, steel A36

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2.3 1 Upper base plate Production Plate 16mm, steel A36

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2.4 2 Support plate Production Flat bar 1 1/2*3/16", steel A36

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2.5 1 Blade support1 Production Square bar 1/2", steel A36

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2.6 1 Blade support2 Production Square bar 1/2", steel A36

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2.7 1 Mobile blade Production Leaf spring 10mm, steel 9260, optional 13mm

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2.8 1 Fixed blade Production Leaf spring 10mm, steel 9260, optional 13mm

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2.9 2 Screw for pivot Standard Hex bolt 1/2*2 1/4" NC

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2.10 6 Fixed blade screw Standard Hexagonal screw 3/8*1 1/8" NC, optional l 1" hexagonal screw

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2.11 4 Pivot nut Standard Hex nut 1/2" NC

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2.12 2 Washer2 Standard Flat washer for 1/2" NC

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2.13 2 Washer Standard Flat washer for 3/8" NC

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2.14 4 Support nut Standard Hex nut 3/8" NC

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2.15 2 Support bushing Production Round bar 3/4", A36 steel

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3.0 1 Lever

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3.1 1 Lever arm Production Plate 12mm, A36 steel

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3.2 1 Lever bar Production Plate 3/16" or 3/4" round bar

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3.3 2 Lever arm Production Plate 12mm, A36 steel

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3.4 2 Lever bushing Production 3/4" round bar, A36 steel

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3.5 2 Union screw Standard Hex bolt 1/2*2 1/2" NC

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3.6 4 Rib nut Standard Hex nut 1/2" NC

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