Multi V-groove self-centering - Revision history

Apm: /* Too much manufacturing errors and too stiff material to mate properly by acceptable pressure */ added link to yet unwritten page Why diodes in parallel are problematic

2025-07-18T16:57:50Z

Too much manufacturing errors and too stiff material to mate properly by acceptable pressure: added link to yet unwritten page Why diodes in parallel are problematic

← Older revision		Revision as of 18:57, 18 July 2025
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	Author of these lines advises to stay away from PLA and variants for <br>		Author of these lines advises to stay away from PLA and variants for <br>
	anything beyond throwaway shape testing prototypes. <br>		anything beyond throwaway shape testing prototypes. <br>

			Related: [[Why diodes in parallel are problematic]]

	== Nanoscale specific considerations ==		== Nanoscale specific considerations ==

Apm at 12:42, 18 July 2025

2025-07-18T12:42:06Z

← Older revision		Revision as of 14:42, 18 July 2025
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	Up: [[Self centering]]		Up: [[Scale agnostic design principles]], [[Self centering]]

	This is about the general mechanical design principle of self centering with <br>		This is about the general mechanical design principle of self centering with <br>

Apm: removed wikitodo as the images where addede - added a new wikitodo for an other image - added Up: Self centering

2025-07-18T12:02:35Z

removed wikitodo as the images where addede - added a new wikitodo for an other image - added Up: Self centering

← Older revision		Revision as of 14:02, 18 July 2025
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	~~{{stub}}~~		Up: [[Self centering]]
	~~{{wikitodo\|Add the two parallel groove infographic}}~~


	This is about the general mechanical design principle of self centering with <br>		This is about the general mechanical design principle of self centering with <br>
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	'''At least two grooves are needed to avert the aforementioned wiggle issue.''' <br>		'''At least two grooves are needed to avert the aforementioned wiggle issue.''' <br>
	Note that this also hold for concentric tangential V-grooves that can serve as rotational slide bearings.		Note that this also hold for concentric tangential V-grooves that can serve as rotational slide bearings.

			{{wikitodo\|Add a photo of the circular V-groove bearing experiment and discuss the outcome.}}

	=== Ultimate load capacity limit ===		=== Ultimate load capacity limit ===

Apm: /* Multi V-groove */ added the second image

2025-07-18T12:00:08Z

Multi V-groove: added the second image

← Older revision		Revision as of 14:00, 18 July 2025
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	== Multi V-groove ==		== Multi V-groove ==

	'''At least two grooves needed to avert the aforementioned wiggle issue.''' <br>		[[File:Selfcentering-and-bending-moment.svg\|600px\|thumb\|right\|rather than increasing the size of a singe V-groove: '''Adding a second groove can massively reduce wiggle problems.''' The grooves can also be orthogonal rather than parallel. More small grooves can be added for preserving more of the mechanical strength of the mating parts.]]

			'''At least two grooves are needed to avert the aforementioned wiggle issue.''' <br>
	Note that this also hold for concentric tangential V-grooves that can serve as rotational slide bearings.		Note that this also hold for concentric tangential V-grooves that can serve as rotational slide bearings.

Apm: added the first graphic

2025-07-18T11:48:36Z

added the first graphic

← Older revision		Revision as of 13:48, 18 July 2025
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	{{stub}}		{{stub}}
	{{wikitodo\|Add the two parallel groove infographic}}		{{wikitodo\|Add the two parallel groove infographic}}


	This is about the general mechanical design principle of self centering with <br>		This is about the general mechanical design principle of self centering with <br>
	using multiple (two or more) female V shaped grooves and opposing male shapes. <br>		using multiple (two or more) female V-shaped grooves and opposing male shapes. <br>
	The principle can be generalized to (three or more) pyramid and cone shaped structures.		The principle can be generalized to (three or more) pyramid and cone shaped structures.

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	== Single V groove ==		== Single V groove ==

			[[File:Selfcentering-howto.svg\|600px\|thumb\|right\|Male side: Cut of the tip (chamfer the edge). Recess the surface or (equivalent in effect) protrude the mating structure.]]

	A single linear female V shaped groove in a part combined with <br>		A single linear female V shaped groove in a part combined with <br>

Apm at 11:28, 18 July 2025

2025-07-18T11:28:08Z

← Older revision		Revision as of 13:28, 18 July 2025
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	using multiple (two or more) female V shaped grooves and opposing male shapes. <br>		using multiple (two or more) female V shaped grooves and opposing male shapes. <br>
	The principle can be generalized to (three or more) pyramid and cone shaped structures.		The principle can be generalized to (three or more) pyramid and cone shaped structures.

			▒▒〕＞▒▒ █🭬🭨█
			▒▒〕＞▒▒ █🭬🭨█

	== Motivations ==		== Motivations ==

Apm: /* Single V groove */ extended on the unicode character table

2025-07-18T11:20:11Z

Single V groove: extended on the unicode character table

← Older revision		Revision as of 13:20, 18 July 2025
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	https://en.wikipedia.org/wiki/Kinematic_coupling		https://en.wikipedia.org/wiki/Kinematic_coupling

	Related unicode characters for the culled off trapezoidal side:		Related unicode characters. <br>
	* ⏠ U+23E0		Also ones for the culled off trapezoidal side:
	* ⏡ U+23E1		* ⏠ U+23E0 ︹ U+FE39 ︿ U+203F
	* 〔 U+3014		* ⏡ U+23E1 ︺ U+FE3A ﹀ U+203E
	* 〕 U+3015		* 〔 U+3014 ＜ U+FF1C 〈 U+3008 〈 U+2329 ⦑ U+2991
			* 〕 U+3015 ＞ U+FF1E 〉 U+3009 〉 U+232A ⦒ U+2992

	== Multi V-groove ==		== Multi V-groove ==

Apm: /* Motivations */ added point on enjoability - added pages general intro text

2025-07-18T11:08:06Z

Motivations: added point on enjoability - added pages general intro text

← Older revision		Revision as of 13:08, 18 July 2025
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	{{stub}}		{{stub}}
	{{wikitodo\|Add the two parallel groove infographic}}		{{wikitodo\|Add the two parallel groove infographic}}

			This is about the general mechanical design principle of self centering with <br>
			using multiple (two or more) female V shaped grooves and opposing male shapes. <br>
			The principle can be generalized to (three or more) pyramid and cone shaped structures.

	== Motivations ==		== Motivations ==
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	* '''Minimizing accumulation of small errors in the assembled structures.''' (Or for [[Atomic precision\|AP structures]] preventing it all together.)		* '''Minimizing accumulation of small errors in the assembled structures.''' (Or for [[Atomic precision\|AP structures]] preventing it all together.)
	* '''Preventing irreversible slip that is not restored when the load is causing (over)load is gone.''' <br> This relates to depending on friction to hold things in place. Which we want to avoid and which this principle can help to avoid.		* '''Preventing irreversible slip that is not restored when the load is causing (over)load is gone.''' <br> This relates to depending on friction to hold things in place. Which we want to avoid and which this principle can help to avoid.
			* Making assembly processes, disassembly processes, part recomposition processes in general <br>into an enjoyable [[oddly satisfying]] experience.

	More abstractly: Correcting lack of accuracy and or precision in the assembling process. <br>		More abstractly: Correcting for lack of accuracy and or precision in the assembling process. <br>
	This can benefit both fully automated assembly and manual assembly remote controlled and direct by hand.		'''This can benefit both fully automated assembly and manual assembly remote controlled and direct by hand.'''

	== Single V groove ==		== Single V groove ==

Apm: /* Constraints on angles of the grooves */

2025-07-18T10:58:32Z

Constraints on angles of the grooves

← Older revision		Revision as of 12:58, 18 July 2025
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	=== Constraints on angles of the grooves ===		=== Constraints on angles of the grooves ===

	Due to the atomistic lattice only the main crystallographic planes offer reasonably smooth surfaces at the lowest scales.		Due to the atomistic lattice only the main crystallographic planes offer reasonably smooth surfaces at the lowest scales. <br>
	This the angles of v-grooves and are pretty much very limited in options and pre given.		This the angles of v-grooves and are pretty much very limited in options and pre given.

Apm: /* Too much manufacturing errors and too stiff material to mate properly by acceptable pressure */ link & typofixes

2025-07-18T10:58:20Z

Too much manufacturing errors and too stiff material to mate properly by acceptable pressure: link & typofixes

← Older revision		Revision as of 12:58, 18 July 2025
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	These issues can be compensated by …		These issues can be compensated by …
	* … going to slightly softer materials that allow fur just enough sufficient flex		* … going to slightly softer materials that allow fur just enough sufficient flex
	* … decreasing manufacturing errors so far that is possible (at all and with acceptable trade-offs) of course. <br>Noat that even in the in the limit of [[atomically precise manufacturing]] there is still the systematic known error in accuracy <br>that comes form the atomic granularity of matter. There is plenty of flexibility though. See [[Superelasticity]] of fully defect devoid [[~~gemstones~~]] at the ~~nanosscale~~.		* … decreasing manufacturing errors so far that is possible (at all and with acceptable trade-offs) of course. <br>Noat that even in the in the limit of [[atomically precise manufacturing]] there is still the systematic known error in accuracy <br>that comes form the atomic granularity of matter. There is plenty of flexibility though. See [[Superelasticity]] of fully defect devoid [[gemstone]]s at the nanoscale.

	Related: [[manufacturing error]] / [[material stiffness]] / [[parallel spring competition]]		Related: [[manufacturing error]] / [[material stiffness]] / [[parallel spring competition]]
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	'''Concrete example in [[FFF 3D printing]]:''' <br>		'''Concrete example in [[FFF 3D printing]]:''' <br>
	Small V-grooves in FFF-3D-printing can incur quite a huge relative errors. <br>		Small V-grooves in FFF-3D-printing can incur quite a huge relative errors. <br>
	(including elephants foot, lack of cooling warping, corner speed ringing, z-~~axix~~-wobbel, and whatnot) <br>		(including elephants foot, lack of cooling warping, corner speed ringing, z-axis-wobbel, and whatnot) <br>
	Many cheap & easy to print 3D printing materials are to stiff to compensate by flex for these errors. <br>		Many cheap & easy to print 3D printing materials are to stiff to compensate by flex for these errors. <br>
	PLA is especially stiff and thus bad for this. Not to mention that it can't cope with high permanent loads. <br>		PLA is especially stiff and thus bad for this. Not to mention that it can't cope with high permanent loads. <br>