We continue to develop resources related to the COVID-19 pandemic. See COVID-19 initiatives on Appropedia for more information.

Difference between revisions of "One Way Ratchet"

From Appropedia
Jump to navigation Jump to search
(Created page with "{{777}} ==Title of the device or system == Project developed by [your name linked to your user account] {{Statusboxtop}} {{status-design}} {{status-prototype}} You can help A...")
 
Line 1: Line 1:
 
{{777}}
 
{{777}}
==Title of the device or system ==
+
== One Way Ratchet ==
  Project developed by [your name linked to your user account]
+
  Project developed by [[User:Wedallma|Wedallma]]  
 
{{Statusboxtop}}
 
{{Statusboxtop}}
 
{{status-design}}
 
{{status-design}}
Line 9: Line 9:
  
 
==Abstract==
 
==Abstract==
# Paragraph description of the OSAT - why is it Appropriate? What need does it fulfil? Are there case studies you have found of a technology being used successfully?
+
# The ratchet is a fairly common tool in today's world. A major advantage of a ratchet is that many tool attachments can be put on the ratchet to perform many different functions. One issue with the ratchet though is that it can oftentimes be very costly to buy one. A printable ratchet could drastically reduce the cost for those in need of tools, such as third world countries. Additionally, the ratchet gives the option of being able to cheaply print any tool attachment that is needed, instead of having to pay for the many different kinds of tools that are available.
 
# Picture of completed print using [[image:name-of-your-image.png|500px|right]]
 
# Picture of completed print using [[image:name-of-your-image.png|500px|right]]
  
 
== Bill of Materials==
 
== Bill of Materials==
# Provide a full BOM -- Materials needed for fabrication of device and alternative materials if they are not available, prices/sources of non-printable parts
+
# The full BOM is as follows:
## Upload and link to all source files
+
## The ratchet outline is 14 grams in weight and 4.57 meters in length. The approximate cost of this part is $0.42.
## Upload and link to all STLs
+
## The ratchet cover is 3 grams in weight and 1.07 meters in length. The approximate cost of this part is $0.09.
 +
## The ratchet gear is 5 grams in weight and 1.76 meters in length. The approximate cost of this part is $0.15.
 +
## The gear pin is 0 (too small to even be 1 gram) grams in weight and 0.06 meters in length. The approximate cost of this part is $0.01.
 +
 
 +
# Files
 +
## Appropedia is unable to upload Blender files. I'm not sure where to link my .blend files from.
 +
## [[File:Ratchet.stl]]
 +
## [[File:RatchetGear.stl]]
 +
## [[File:GearPin.stl]]
 +
## [[File:RatchetCover.stl]]
  
 
== Tools needed for fabrication of the OSAT==
 
== Tools needed for fabrication of the OSAT==
 
# [[Delta_Build_Overview:MOST| MOST Delta RepRap]] or similar RepRap 3-D printer
 
# [[Delta_Build_Overview:MOST| MOST Delta RepRap]] or similar RepRap 3-D printer
#
+
# Depending on print quality, a knife may be needed to shave away plastic on the edges of the parts that come together.
 +
# Super glue may be needed to join the gear pin to the ratchet to add reliability, though super glue is not entirely necessary for the ratchet to function.
  
 
== Skills and Knowledge Necessary to Make the OSAT ==
 
== Skills and Knowledge Necessary to Make the OSAT ==
* If you used special skill – link to relevant wikipedia or wikiversity articles/courses
+
* No special skills or knowledge needed.
  
 
== Technical Specifications and Assembly Instructions==
 
== Technical Specifications and Assembly Instructions==
# Provide directions for print/assembly - be detailed enough in your “how to” to ensure that someone could construct the device from your description. Consider the elegance of IKEA like instructions.
+
# First, take note that there is a small opening and a large opening on the ratchet. Inside the large opening is a small rectangular inlet, this is where the gear pin is placed. As mentioned in the "Tools needed..." section above, super glue can be placed on the gear pin and inlet to attach the gear pin to the ratchet. Next, the block on the ratchet gear is placed through the small opening of the ratchet starting from the large opening. Lastly, the ratchet cover is placed over the large opening of the ratchet to cover up the parts inside the ratchet.
# Include print time estimate
+
 
 +
# The small opening on the ratchet may need to have some plastic shaved away (by a knife or similar tool) for the gear to move properly inside the ratchet. Additionally, the ratchet cover may need to have some plastic shaved away (by a knife or similar tool) to fit on the backside of the ratchet.
 +
 
 +
# Total print time estimate is 152 minutes. Print time estimates for the individual parts are as follows: ratchet - 89 minutes, ratchet cover - 16 minutes, ratchet gear - 43 minutes, and gear pin - 4 minutes.
 
# Include assembly time estimate
 
# Include assembly time estimate
 
# Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
 
# Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
# Consider video if appropriate
 
{|style="border:1px solid #73BF73; background-color: #E6FFE6; margin-left:.1em; margin-top:2px; -moz-border-radius:15px;" align="right" width="150px"
 
!<big>Example video summary of textbook</big>
 
|-
 
|<center>{{#widget:YouTube|id=yiJDx9dCfEQ}} </center>
 
|-
 
|}
 
  
 
=== Common Problems and Solutions===
 
=== Common Problems and Solutions===
* Include common mistakes/problems to avoid in building your OSAT and how to overcome them
+
* One primary problem with this ratchet is that it is only one way, in other words, the ratchet direction cannot be switched between clockwise or counter-clockwise. At this moment, the ratchet functions in a counter-clockwise direction. The only solution is to print a second ratchet that can function in the clockwise direction. To do this, the ratchet and ratchet gear STLs simply need to be mirrored to create a clockwise ratchet. The gear pin and ratchet cover do not need to be mirrored since they are symmetrical and do not affect the direction of the ratchet.
 +
 
 +
* It's important to note that this is a ratchet without any attachments. Tool attachments can be made to fit the 12mm x 12mm block end of the gear.
  
 
== Cost savings==
 
== Cost savings==
* If your solution is not a low cost one then it is not really appropriate.
+
# The total cost estimate of the ratchet is $0.67. Since two ratchets are needed to complete the function of a factory manufactured ratchet, the total cost of both ratchets is $1.34.
# Estimate your costs
+
# A commercial ratchet at the very lowest price costs about $12.00.
# Find a commercial equivalent
+
# Total savings = $10.66 at a 88.8% savings rate.
# Calculate $ savings and % savings
 
  
 
==References==
 
==References==
  
* The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <nowiki> <ref> </ref> and <references/>  </nowiki>tags and can be in any format but should include all the information necessary for someone else to find the same information you did. For example: <ref> web page: Department of Energy (DOE) Landscaping and Energy Efficiency, DOE/GO-10095 (1995) Available: http://www.eren.doe.gov/erec/factsheets/landscape.html</ref>
+
* <ref> Image: Wikimedia. Available: http://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Ratchet_Drawing.svg/180px-Ratchet_Drawing.svg.png </ref>
 
+
<references/>
<references/>  
 
<nowiki>
 
Based on the developmental needs addressed (e.g. food, heat, electricity, clean water, health  care, etc.) be sure to label your device in the proper categories e.g. use [[Category:Water]]. Be sure to categorize your device so that it will be easy to find – for example “Low voltage connection basics” is categorized in
 
 
 
  
  
 
[[Category:How tos]]
 
[[Category:How tos]]
[[Category:Electricity]]
+
[[Category:Tools]]
[[Category:Electric lighting]].
+
[[Category:Gears]]
 
 
</nowiki>
 

Revision as of 02:48, 4 December 2014

MOST Delta filament as guide.JPG This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the discussion tab. The course runs in the Fall semester. It is not open edit.


One Way Ratchet

Project developed by Wedallma 
Status
This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.

Abstract

  1. The ratchet is a fairly common tool in today's world. A major advantage of a ratchet is that many tool attachments can be put on the ratchet to perform many different functions. One issue with the ratchet though is that it can oftentimes be very costly to buy one. A printable ratchet could drastically reduce the cost for those in need of tools, such as third world countries. Additionally, the ratchet gives the option of being able to cheaply print any tool attachment that is needed, instead of having to pay for the many different kinds of tools that are available.
  2. Picture of completed print using

Bill of Materials

  1. The full BOM is as follows:
    1. The ratchet outline is 14 grams in weight and 4.57 meters in length. The approximate cost of this part is $0.42.
    2. The ratchet cover is 3 grams in weight and 1.07 meters in length. The approximate cost of this part is $0.09.
    3. The ratchet gear is 5 grams in weight and 1.76 meters in length. The approximate cost of this part is $0.15.
    4. The gear pin is 0 (too small to even be 1 gram) grams in weight and 0.06 meters in length. The approximate cost of this part is $0.01.
  1. Files
    1. Appropedia is unable to upload Blender files. I'm not sure where to link my .blend files from.
    2. File:Ratchet.stl
    3. File:RatchetGear.stl
    4. File:GearPin.stl
    5. File:RatchetCover.stl

Tools needed for fabrication of the OSAT

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Depending on print quality, a knife may be needed to shave away plastic on the edges of the parts that come together.
  3. Super glue may be needed to join the gear pin to the ratchet to add reliability, though super glue is not entirely necessary for the ratchet to function.

Skills and Knowledge Necessary to Make the OSAT

  • No special skills or knowledge needed.

Technical Specifications and Assembly Instructions

  1. First, take note that there is a small opening and a large opening on the ratchet. Inside the large opening is a small rectangular inlet, this is where the gear pin is placed. As mentioned in the "Tools needed..." section above, super glue can be placed on the gear pin and inlet to attach the gear pin to the ratchet. Next, the block on the ratchet gear is placed through the small opening of the ratchet starting from the large opening. Lastly, the ratchet cover is placed over the large opening of the ratchet to cover up the parts inside the ratchet.
  1. The small opening on the ratchet may need to have some plastic shaved away (by a knife or similar tool) for the gear to move properly inside the ratchet. Additionally, the ratchet cover may need to have some plastic shaved away (by a knife or similar tool) to fit on the backside of the ratchet.
  1. Total print time estimate is 152 minutes. Print time estimates for the individual parts are as follows: ratchet - 89 minutes, ratchet cover - 16 minutes, ratchet gear - 43 minutes, and gear pin - 4 minutes.
  2. Include assembly time estimate
  3. Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)

Common Problems and Solutions

  • One primary problem with this ratchet is that it is only one way, in other words, the ratchet direction cannot be switched between clockwise or counter-clockwise. At this moment, the ratchet functions in a counter-clockwise direction. The only solution is to print a second ratchet that can function in the clockwise direction. To do this, the ratchet and ratchet gear STLs simply need to be mirrored to create a clockwise ratchet. The gear pin and ratchet cover do not need to be mirrored since they are symmetrical and do not affect the direction of the ratchet.
  • It's important to note that this is a ratchet without any attachments. Tool attachments can be made to fit the 12mm x 12mm block end of the gear.

Cost savings

  1. The total cost estimate of the ratchet is $0.67. Since two ratchets are needed to complete the function of a factory manufactured ratchet, the total cost of both ratchets is $1.34.
  2. A commercial ratchet at the very lowest price costs about $12.00.
  3. Total savings = $10.66 at a 88.8% savings rate.

References