iTopSpin

Current Posts => Collecting, Modding, Turning and Spin Science => Topic started by: Neff on March 11, 2017, 04:13:56 PM

Title: K'Neffy string twister
Post by: Neff on March 11, 2017, 04:13:56 PM
Finally did this - parts list for the business end of the K'Neffy string twister.  There is a sale until March 31 at Knex.com.  Right now these parts total about $7.43, shipping will probably be around $6.00.  In addition to this you would need to build a stationary hook block and a rack to support your drill.  And buy some thread.

And here is the video showing it in use.
https://youtu.be/P_9yBj5IZgU
Title: Re: How to build the K'Neffy string twister
Post by: butterfingers on March 11, 2017, 06:45:01 PM
This is great. Thank you for posting.

I also want to thank you for posting the overhead view of the regeneration techniques (I think you had Charlie Brown music playing during the video). It was a tremendous help to me.

Next stop: KNex store.
Title: Re: How to build the K'Neffy string twister
Post by: Diz on March 12, 2017, 03:57:38 AM
Yes thanks! That is very good of you to post that. I'm going to try building one for sure!
Title: Re: How to build the K'Neffy string twister
Post by: Jack on March 12, 2017, 03:16:04 PM
Finally did this - parts list for the business end of the K'Neffy string twister.  There is a sale until March 31 at Knex.com.  Right now these parts total about $7.43, shipping will probably be around $6.00.  In addition to this you would need to build a stationary hook block and a rack to support your drill.  And buy some thread.

And here is the video showing it in use.

 bestower of great wisdoms


(https://s-media-cache-ak0.pinimg.com/originals/f1/6e/a9/f16ea9a963853ae920f1d0afd58b6b16.gif)
Title: Re: How to build the K'Neffy string twister
Post by: Jeremy McCreary on March 12, 2017, 08:09:05 PM
Silly question: Why doesn't the string unwind itself when you remove it from the rig?

From what I can see of the twister design, LEGO Technic parts would probably work, too.
Title: Re: How to build the K'Neffy string twister
Post by: butterfingers on March 12, 2017, 08:23:49 PM
Just ordered KNex parts to make one of these. The site gave me a $5 credit...so about $10 for all the bits I need for the set up.
Title: Re: How to build the K'Neffy string twister
Post by: ta0 on March 12, 2017, 08:37:49 PM
(Note if you are reading this thread and not seeing the parts list: it's an attached image and you need to be logged in to see it)

Wonderful! Thanks Chris for this contribution to the community!

Silly question: Why doesn't the string unwind itself when you remove it from the rig?
I think the idea is that the (pairs of) threads are twisted individually in one direction while the whole thing is twisted in the other. For one to untwist it has to twist the other even more, so their torques balance out. But I am like you, it is surprising that it works so well. I need to think in detail about it.
Title: Re: How to build the K'Neffy string twister
Post by: Jack on March 12, 2017, 09:56:08 PM

I think the idea is that the (pairs of) threads are twisted individually in one direction while the whole thing is twisted in the other.

wisdom @-@
Title: Re: How to build the K'Neffy string twister
Post by: cecil on March 12, 2017, 11:53:53 PM
At $ 7.43 plus shipping I would LOVE two Chris. For me I found out after 15 bad lines - is to copy CHRIS. With my 4 square hoke I'm making good lines now. But it's time to step it up.
Title: Re: How to build the K'Neffy string twister
Post by: Neff on March 13, 2017, 12:57:48 AM
Silly question: Why doesn't the string unwind itself when you remove it from the rig?

The string twists in the first stage of the operation, and untwists in the second stage.  It is twisted when it is four separate strands, then it untwists into one single strand.  In the first phase, because I am holding the block, the gears engage and the hooks are spinning the opposite direction of the drill.  In the second phase the entire apparatus spins the direction of the drill.  Poof.  String!
Title: Re: How to build the K'Neffy string twister
Post by: Neff on March 13, 2017, 01:09:45 AM
At $ 7.43 plus shipping I would LOVE two Chris. For me I found out after 15 bad lines - is to copy CHRIS. With my 4 square hoke I'm making good lines now. But it's time to step it up.

String twisters assembled by me will cost a little more than that, mister.  At normal prices the parts are $10 plus $5 to ship them to me. If I don't add to my $15 cost there is little incentive to make one for somebody. I'm thinking minimum $25 plus shipping. It does not take a terrible amount of time to assemble one but I balance mine a certain way and also oil them so they don't melt or explode  >:D
Title: Re: K'Neffy string twister
Post by: cecil on March 14, 2017, 12:56:19 AM
At $ 30.00 that's a GREAT DEAL. Please send me one. I have been working with C.A glue for a long time. And I always seem to make a mess with that stuff.
Title: Re: K'Neffy string twister
Post by: Diz on April 18, 2017, 11:55:32 AM
  ;D Finally got my K'Nex parts yesterday and put together my very own K'Neffy String Twister! I don't have a drill so spinning it by hand takes about ten minutes to make a string. They come out really nice! My experience has really only been throwing with a Duncan string or lengths of cotton twine so it will be interesting to see what a difference this makes. Big thanks to Neff!
-James 
Title: Re: K'Neffy string twister
Post by: Neff on April 18, 2017, 10:04:11 PM
Very glad to hear you built one for yourself!  You will probably want to figure things out yourself also, but don't hesitate to drop me a message if something isn't working out.
Title: Re: K'Neffy string twister
Post by: Diz on April 23, 2017, 09:47:01 PM
Now I understand why everyone likes handmade strings! My play has become a bit better and a lot smoother using it. Right now I am trying to figure out why some strings feel like they "grab" the tip more, which is something I find useful on certain tricks. If you have any insight regarding that I'd appreciate the input!
Title: Re: K'Neffy string twister
Post by: Mermouy on May 02, 2017, 03:46:01 PM
Hi Chris!
Is this still vailable from you? Are you still able to order/construct it?
If so I would be happy to get one for sure...
Just PM me if it is possible.

Thanks!!! (for this and all the rest)
Title: Re: K'Neffy string twister
Post by: Neff on May 03, 2017, 07:29:11 PM
Yessir!  I will message you  8)
Title: Re: K'Neffy string twister
Post by: Renee on February 21, 2018, 12:59:33 PM
Ordered the k'nex parts and they should be here later today.  On my way out to the garage to build the stationary hook block. 
Could someone post some still photos of the k'nex twister from different angles, to help me figure out how to put it together?
Title: Re: K'Neffy string twister
Post by: Diz on February 21, 2018, 06:33:41 PM
The K'Neffy is a lot of fun to make and use. But perhaps because mine is hand cranked I had to get something to stop the individual spindles from moving at the 2nd stage like this lady does at about 1:00 in the video:

 https://youtu.be/RCoTxy81q_U
Title: Re: K'Neffy string twister
Post by: Renee on February 21, 2018, 08:07:19 PM
Seems like she is twisting in the opposite direction than you would want for top string in the video.  But, it's a nice set up.

I managed to put a workable k'nex twister together.  I had one spacer ring left over, and the little stopper piece was not on the parts list but I found that a clothes pin works quite well.  Here's my very first practice run at string winding.  It  had a couple of kinks, but overall,
 I was quite pleased.  I'm sure some practice will help.

(http://thumb.ibb.co/dpkz3H/first_string.jpg) (http://ibb.co/dpkz3H)


Title: Re: K'Neffy string twister
Post by: the Earl of Whirl on February 21, 2018, 11:54:54 PM
I love the music in that video!!!
Title: Re: K'Neffy string twister
Post by: Neff on February 28, 2018, 09:49:29 PM
Thanks for sharing that Diz!  Well thought out setup. I like the adjustable counterweight in the form of the pitcher, but as you can see in the video, during the re-wind, the rope starts to slack, which can lead to undesirable results IMO. 
Title: Re: K'Neffy string twister
Post by: cecil on March 01, 2018, 12:31:42 AM
I bought mine from Chris, and I love it. I've made lines for 2.00 to 4 3/4 tops. I bought mine ready to go. I did make changes, I broke the center driving rod and replaced it with 1/4 solid delrin rod with a notch in it. Plus I took C.A to every thing. JUST SO MUCH FUN.
Title: Re: K'Neffy string twister
Post by: Neff on March 01, 2018, 05:32:25 PM
If you want anything stress-tested, send it to Cecil. He does not go gently lols  ;D