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Author Topic: How to make spintop string video on youtube  (Read 157 times)

dazzlingdave

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How to make spintop string video on youtube
« on: July 08, 2019, 08:06:40 AM »

Hey guys.

I made a video about how to make spintop string using the Neffy knex string maker. Take a look if you are into that sort of thing!

https://www.youtube.com/watch?v=D-2bKeIXYO4&t=8s

« Last Edit: July 08, 2019, 08:10:07 AM by dazzlingdave »
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Renee

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Re: How to make spintop string video on youtube
« Reply #1 on: July 08, 2019, 12:15:35 PM »

This kNeffy string twister is slightly different than mine.  I like the built in tab to hold the gear box, and the hooks for the string are sleeker.  Plus, the bolt through the center has to be less wobbly than the knex axel.  Does anyone have a parts list for this version?  Here's a photo of mine. 

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dazzlingdave

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Re: How to make spintop string video on youtube
« Reply #2 on: July 10, 2019, 06:45:10 AM »

I just kind of made mine with parts I had on hand....and then made slight improvements. (there is the hand hold, and a locking black piece that makes it so it will not turn on its own when I am hooking up the strings.) I never made a parts list etc.....just put it together.

The center bolt was required the day I made this video.....the drive shaft broke on my knex part! (and I was in Chicago with no access to knex pieces!)

It does work great to have the metal bolt going through....very solid!
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paxl13

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Re: How to make spintop string video on youtube
« Reply #3 on: July 10, 2019, 09:53:21 AM »

The bolt look better honestly than the shaft if you ask me...

Maybe a change I'll do!
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ta0

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Re: How to make spintop string video on youtube
« Reply #4 on: July 10, 2019, 10:03:34 AM »

Very clear and useful tutorial Dave!
Thanks for your contribution!
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Jeremy McCreary

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Re: How to make spintop string video on youtube
« Reply #5 on: July 10, 2019, 04:10:09 PM »

I just kind of made mine with parts I had on hand....and then made slight improvements. (there is the hand hold, and a locking black piece that makes it so it will not turn on its own when I am hooking up the strings.) I never made a parts list etc.....just put it together.
The center bolt was required the day I made this video.....the drive shaft broke on my knex part! (and I was in Chicago with no access to knex pieces!)
It does work great to have the metal bolt going through....very solid!
Excellent demo! You inspired me to make LEGO versions of your improved string twister and hook box. Need the following twister specs to start testing...

Q1: The twister's spinning string attachments make a square. If the corners are on axle centers, how long are your sides?

Q2: How many teeth on your gears? (My prototype uses a 40-tooth sun driving four 24-tooth planets at corners of the square. That's a 1.67 sun-to-planet overdrive.)

Q3: Any idea how fast your drill is turning when twisting typical string with frame held? With frame free to turn?

Thanks! Will share final LEGO solution.
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Renee

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Re: How to make spintop string video on youtube
« Reply #6 on: July 10, 2019, 05:24:08 PM »

Dave, could you post some still shots of the twister from different angles so we can see the construction better?
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