CAM Jam Challenges - Revision history

Larry: Changed link to materials file since compressed wouldn't upload to the cloud properly.

2026-06-19T22:14:13Z

Changed link to materials file since compressed wouldn't upload to the cloud properly.

← Older revision		Revision as of 22:14, 19 June 2026
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	\|2700 kg/m3		\|2700 kg/m3
	\|}		\|}
	The key point is the the density, the material name and other parameters really don't matter. You can modify existing materials to match the given density, create new ones, or likely the easiest method is to copy the materials into your library. To copy, ~~simply~~ [https://cloud.knoxmakers.org/s/~~aLnbDob8wFXmpR9 unzip~~ these ~~files~~] into your .../FreeCAD/v1-1/Material folder and restart FreeCAD.		The key point is the the density, the material name and other parameters really don't matter. You can modify existing materials to match the given density, create new ones, or likely the easiest method is to copy the materials into your library. To copy, [https://cloud.knoxmakers.org/s/eNWaPwejXWZfaGA download each of these] into your .../FreeCAD/v1-1/Material folder and restart FreeCAD.

	The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against. NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!		The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against. NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!

Larry: Updated .pdf for Phone Stand to show radius

2026-06-19T21:16:58Z

Updated .pdf for Phone Stand to show radius

← Older revision		Revision as of 21:16, 19 June 2026
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	\|Phone Stand		\|Phone Stand
	\|[https://cloud.knoxmakers.org/s/~~2JQikiEXqbncYQD~~ Link]		\|[https://cloud.knoxmakers.org/s/H7WjeowKgKTPnbb Link]
	\|		\|
	\|-		\|-

Larry at 15:40, 10 June 2026

2026-06-10T15:40:28Z

← Older revision		Revision as of 15:40, 10 June 2026
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	The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against. NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!		The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against. NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!

			The Example below shows how to generate MASS numbers which is the most common self check method. Do note that some challenges utilize VOLUME instead and this calculation is irrelevant of the material chosen and can be found a little further down in the graphic below.
	[[File:COM Markup.png\|center\|thumb\|800x800px]]		[[File:COM Markup.png\|center\|thumb\|800x800px]]

Larry at 14:52, 10 June 2026

2026-06-10T14:52:43Z

@@ Line 26: / Line 26: @@
 |2700 kg/m3
 |}
-The key point is the the density, the material name and other parameters really don't matter. You can modify existing materials to match the given density, create new ones, or likely the easiest method is to copy the materials into your library. To copy, simply place these files into your .../FreeCAD/v1-1/Material folder and restart FreeCAD.
+The key point is the the density, the material name and other parameters really don't matter. You can modify existing materials to match the given density, create new ones, or likely the easiest method is to copy the materials into your library. To copy, simply [https://cloud.knoxmakers.org/s/aLnbDob8wFXmpR9 unzip these files] into your .../FreeCAD/v1-1/Material folder and restart FreeCAD.
 The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against.  NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!
 [[File:COM Markup.png|center|thumb|800x800px]]

Larry at 14:41, 10 June 2026

2026-06-10T14:41:31Z

← Older revision		Revision as of 14:41, 10 June 2026
Line 26:		Line 26:
	\|2700 kg/m3		\|2700 kg/m3
	\|}		\|}
	The key point is the the density, the material name and other parameters really don't matter. You can modify existing materials to match the given density, create new ones, or likely the easiest method is to copy the materials into your library.		The key point is the the density, the material name and other parameters really don't matter. You can modify existing materials to match the given density, create new ones, or likely the easiest method is to copy the materials into your library. To copy, simply place these files into your .../FreeCAD/v1-1/Material folder and restart FreeCAD.

	The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against. NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!		The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against. NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!
	[[File:COM Markup.png\|center\|thumb\|800x800px]]		[[File:COM Markup.png\|center\|thumb\|800x800px]]

Larry: Initial page content population

2026-06-10T14:36:42Z

Initial page content population

New page

== What Are CAM Jam Challenges? ==
CAM Jam Challenges, or CJCs as I hope to start calling them for ease, are structured exercises that members can complete at their own pace. These challenges are rated by a Complexity Level and, more importantly, once completed you can validate the accuracy of your own work!

The intention is to release new sets of challenges each month and then discuss and review in our monthly CAM Jam sessions so that we can all learn collectively as well as individually.

== How Do I Check My Completed Challenges? ==
Each challenge is based around an engineering style drawing that includes specific dimensions and material density. Given that mass and volume details can be calculated from this information it is easy to compare the expected value(s) listed in the SELF CHECK block of the drawing against your design.

==== I'm Pretty New To FreeCAD, How Do I Find Volume and Mass Information? ====
The first step is to ensure that the density value in your materials library matches that listed on the challenge sheet. For current challenges density values should be as follows:
{| class="wikitable"
|+
!Material
!Density
|-
|ABS
|1020 kg/m3
|-
|American Cherry
|570 kg/m3
|-
|Carbon Steel
|7800 kg/m3
|-
|6061 Aluminum
|2700 kg/m3
|}
The key point is the the density, the material name and other parameters really don't matter. You can modify existing materials to match the given density, create new ones, or likely the easiest method is to copy the materials into your library.

The second step is to install an Addon called CenterOfMass. With the material set, select a body in FreeCAD and this utility will provide the necessary Mass and Volume numbers to check against. NOTE: Watch your units in Preferences at the top of the page! If it defaults to kg/m3 for instance but you need g/cm3 your numbers will look way off!
[[File:COM Markup.png|center|thumb|800x800px]]