Slingshot Forum - The Slingshot Channel Official Forum > General > General Slingshot Discussions > Band life - a new approach


Reply
 
LinkBack Thread Tools
Old 09-19-2013, 09:29 AM   #1
JoergS
Administrator
TSF_ADMIN.png
 
JoergS's Avatar
 
Join Date: Sep 2011
Location: Upper Franconia / Germany
Age: 48
Posts: 3,828
Liked 7168 Times on 1710 Posts
Likes Given: 14

Send a message via Skype™ to JoergS
Default Band life - a new approach

I have been doing a lot of shooting these last few days, as I don't have to go to work anymore (hopefully for EVER!). I love YouTube!

Anyway. So far, I pretty much thought that tapering and band stretch are the only factors that have an impact on the band lifetime. No tapering, low stretch = many many shots, extreme tapering and stretch = very very few shots.

However that isn't the entire story.

My new through-the-insides shooter easily doubles the lifetime of a band vs. OTT frames. That's right. I got more than 150 shots from a 3:2 tapered band that I stretched to factor 6 (= as far as possible). That band would have lasted maybe 50 shots, 70 shots tops, on an OTT frame.

Then I cut a totally untapered bandset for an OTT shooter, same stretch. It broke after about 80 shots. However the important part is: It breaks at the pouch, just like the tapered bands do.

I now believe that one of the main reasons for the bands breaking at the pouch isn't the higher stretch. Maybe it is the impact of the bands when they snap back. The ITTF slingshot leads to way less violent hits because the don't have that hurling effect, but go straight back through the fork.

In other words: The OTT method leads to hits of the bands to the hard parts of the frame.

I now cut a loong bandset (40 cm active length), entirely untapered, 3cmx3cm, 2 bands per side. I attached it to the hand braced slingshot I made some time ago, but I "upholstered" the front with some thick leather.



Let's see how long these bands last!



__________________
http://www.slingshotchannel.com

THIS FORUM ALLOWS SIGNATURES AS LONG AS THEY ARE POLITE.
JoergS is offline  
15
People Like This 
Reply With Quote
Old 09-19-2013, 09:45 AM   #2
kineticweaponry
Senior Member
 
Join Date: Feb 2013
Location: Sydney Australia
Age: 22
Posts: 280
Liked 470 Times on 157 Posts
Likes Given: 290

Default

Cool idea! I thought it was sandpaper on the front, that could also be a cool experiment.



__________________
kineticweaponry is offline  
tokSick Likes This 
Reply With Quote
Old 09-19-2013, 09:50 AM   #3
KnuckieG
Senior Member
 
KnuckieG's Avatar
 
Join Date: Aug 2013
Location: Where Oil meets Water,South Wales
Posts: 142
Liked 465 Times on 130 Posts
Likes Given: 155

Default

That's just brilliant Jorge but what about factors such as storage,age,humidity,temperature,and exposure to sun light. Do you have advice regarding those things? If you solve those problems you might be able to give up your youtube job lol!

Out of interest I wonder what the bandlife is like in Tobias' cow hide covered slingshot?

__________________
KnuckieG is offline  
tokSick Likes This 
Reply With Quote
Old 09-19-2013, 10:06 AM   #4
KnuckieG
Senior Member
 
KnuckieG's Avatar
 
Join Date: Aug 2013
Location: Where Oil meets Water,South Wales
Posts: 142
Liked 465 Times on 130 Posts
Likes Given: 155

Default

Off the top of my head perhaps it isn't just the impact of the bands and pouch on the wooden frame but also the friction? A wad of padding covered in teflon cloth would absorb the impact but "teflon cloth" PTFE

http://www.fennerprecision.com/capabilities/fabrics/low-friction-fabrics.php

http://www.ebay.co.uk/itm/Non-Stick-Applique-Pressing-Mat-TEFLON-Ironing-heatproof-cloth-Hemline-H855-PTFE-/161050702117?pt=UK_Crafts_Sewing_Supplies_MJ&hash=item257f5eb125

would be super slippery to avoid friction making the impact localise and increase damage? Just a musing.

Like if Wile E Coyote fell off a motorbike at speed on a road surface he'd be grated like cheese but if he fell off onto a teflon road he'd slide right off undamaged... before falling off the cliff

__________________

Last edited by KnuckieG; 09-19-2013 at 10:14 AM.
KnuckieG is offline  
2
People Like This 
Reply With Quote
Old 09-19-2013, 10:08 AM   #5
BeMahoney
Senior Member
TSF_SUPPORTER.png
 
BeMahoney's Avatar
Slingshots
 
Join Date: Aug 2013
Location: Germany - Im Pott
Age: 40
Posts: 2,752
Liked 5880 Times on 2137 Posts
Likes Given: 8367

Default pardon me,

hi Jörg,

I don´t get it..
Are you refering to that "TTF Rambone experiment" or to the Slingshot shown in this thread?

If you refer to the "TTF Rambone experiment", then I get your point.
There is that simple archaic principle of a fork, rubber and a pouch..
And as always perfection means to master the joints, the attachments.
Yet I think that there is some more efficient "truth" to be found thinking
about the pouch (mainly about weight, softness and the vectors of inner forces)...

Greetings,

Be

__________________
BeMahoney is offline  
3
People Like This 
Reply With Quote
Old 09-19-2013, 11:11 AM   #6
CEZ
Senior Member
 
CEZ's Avatar
Slingshots
 
Join Date: Oct 2011
Location: Wrocław/Poland
Posts: 723
Liked 488 Times on 217 Posts
Likes Given: 142

Default

Cool, can't wait for the results, band breakage is a big issue for me.

__________________
CEZ is offline  
tokSick Likes This 
Reply With Quote
Old 09-19-2013, 11:38 AM   #7
AngelicScars
MILF of the board
 
AngelicScars's Avatar
 
Join Date: Sep 2013
Location: South Carolina
Posts: 1,222
Liked 2248 Times on 918 Posts
Likes Given: 836

Default

Interesting!
I think what was brought up is good to factor in as well (weather, how it's stored and whatnot).

__________________
AngelicScars is offline  
3
People Like This 
Reply With Quote
Old 09-19-2013, 01:19 PM   #8
Jeremy
I totally rock a Pink Scout! Pink is the new black.
 
Jeremy's Avatar
 
Join Date: Aug 2013
Location: Northern Utah.
Posts: 1,461
Liked 2095 Times on 937 Posts
Likes Given: 1601

Default

Quote:
Originally Posted by AngelicScars View Post
Interesting!
I think what was brought up is good to factor in as well (weather, how it's stored and whatnot).
I agree. I'm sure there are other factors to be considered, besides the bands slapping back into the forks with an OTT shooter. I do believe that J?rg is onto something though.
__________________

To many slingshots!?! One can NEVER have to many slingshots.

Jeremy is online now  
tokSick Likes This 
Reply With Quote
Old 09-19-2013, 01:27 PM   #9
JoergS
Administrator
TSF_ADMIN.png
 
JoergS's Avatar
 
Join Date: Sep 2011
Location: Upper Franconia / Germany
Age: 48
Posts: 3,828
Liked 7168 Times on 1710 Posts
Likes Given: 14

Send a message via Skype™ to JoergS
Default

The idea for now is to find out if a longer band without any tapering and a "cushioned" OTT frame will lead to long band life.

Then I will do the same setup with ITTF frame.

The hunt for the longest living bands!

BTW I clocked the setup... 53 m/s with the 33g 20mm steel ball... 46 Joules. Not bad for no tapering and stretch factor 4. Draw weight is pretty acceptable at that low stretch.

__________________
http://www.slingshotchannel.com

THIS FORUM ALLOWS SIGNATURES AS LONG AS THEY ARE POLITE.
JoergS is offline  
2
People Like This 
Reply With Quote
Old 09-19-2013, 01:32 PM   #10
Lacumo
 
Lacumo's Avatar
 
Join Date: Aug 2013
Posts: 331
Liked 367 Times on 209 Posts
Likes Given: 108

Default

I'm interested in seeing what this study develops. I'm presently saving up HDPE and I'll probably start making frames in a few weeks. I'm still undecided on the OTT vs. TTF quandary.



__________________
Lacumo is offline  
2
People Like This 
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
It started life as a pickle… Neidzwiedz Show off your homemades! 4 08-03-2013 08:16 PM
Shelf Life of Theraband Gold ArnoldKelly General Slingshot Discussions 6 07-30-2013 08:04 PM
Fork/Pouch wide coefficient, less band but wider or more band but thiner? otta88sun General Slingshot Discussions 35 01-01-2013 10:46 PM
ya know things look easy in life sometimes cb490s General Slingshot Discussions 2 10-17-2012 01:55 AM
SS bands life span The Mikester General Slingshot Discussions 1 05-08-2012 07:04 AM