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Speed Freaks - SSF 300 Club


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#421 Charles

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Posted 01 June 2016 - 11:04 AM

The only provision for these competitions is to post a video. We do not build slingshots to test for other folks.

 

Cheers ..... Charles



#422 calinb

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Posted 01 June 2016 - 01:58 PM

I guess you got it uploaded okay. Great and also thanks! I prefer GrabCAD.com to Thingiverse, which is too PC and weapons/2nd Amendment-adverse. GrabCAD.com is also frequented by more serious designers, rather than 3D-printed toy and garden gnome collectors! :soapbox:

 

I've never hit a size limit. If you are hitting a size limit and you have the original CAD (solid model) files, try different settings when exporting to .stl. If you only have the .stl, you could "re-mesh" the file to be smaller using any number of tools (meshlab and blender are free but difficult to learn to use). There is no reason that a slingshot .stl file should even come close to maxing out on upload, other than it contains far more polygons than it needs!

 

oh, and Thingiverse is a platform where can put your 3D print file to share so that other people can dowload and try out what you have builded. So, there you can find my slingshot:

https://www.thingive...m/thing:1589828


Edited by calinb, 01 June 2016 - 02:00 PM.


#423 aiping

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Posted 02 June 2016 - 01:50 PM

O.K , here are the data:

Temperature 30 degreee celsius
Humidity 70%

Bullet 9.5 mm / 3.55 gram / steel
Muzzle to target 6.5 meter (the cups are marking 1m intervalls)
Device to muzzle 0 meter (external micro just over news paper impact area)
Device to pellet path 0.3 meter

TBB
9 cm at fork
3.5 cm at pouche
Length 25 cm / active about 23 cm
Draw 140 cm ?

Pouche
Soft leather
8 cm x 1.5 cm x 1 mm , band folded at a length of 1.5 cm
left and right over the edge, and again center folded,
than wrapped with 10 windings of office rubber with maximum tension

Uncut video (even the comment when the band ruptured at shot 12...) at

https://www.sendspace.com/file/i1rjn9

Shot fps ftbf
1 536 35
2 499 30.3
3 512 31.9
4 534 34.7
5 534 34.7 ? (but the counter correctly changed)
6 546 36.3
7 538 35.2
8 530 34.2
9 503 30.8
10 431 22.6 ? ( pouch touched newspaper ?)
11 562 38.4
12 206 ( band ruptured...)

That's all so far

All the best from A-Ping

#424 Genoa Slingshot

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Posted 02 June 2016 - 05:03 PM

TBB
9 cm at fork
3.5 cm at pouche
Length 25 cm / active about 23 cm
Draw 140 cm ?
Pouche
Soft leather
8 cm x 1.5 cm x 1 mm , band folded at a length of 1.5 cm
left and right over the edge, and again center folded,
than wrapped with 10 windings of office rubber with maximum tension

Nice shooting!
Please can you post a picture or some pictures of how you attach the Theraband black to the frame and to the pouch.
Thanks :)

#425 Charles

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Posted 02 June 2016 - 05:40 PM

O.K , here are the data:

Temperature 30 degreee celsius
Humidity 70%

Bullet 9.5 mm / 3.55 gram / steel
Muzzle to target 6.5 meter (the cups are marking 1m intervalls)
Device to muzzle 0 meter (external micro just over news paper impact area)
Device to pellet path 0.3 meter

TBB
9 cm at fork
3.5 cm at pouche
Length 25 cm / active about 23 cm
Draw 140 cm ?

Pouche
Soft leather
8 cm x 1.5 cm x 1 mm , band folded at a length of 1.5 cm
left and right over the edge, and again center folded,
than wrapped with 10 windings of office rubber with maximum tension

Uncut video (even the comment when the band ruptured at shot 12...) at

https://www.sendspace.com/file/i1rjn9

Shot fps ftbf
1 536 35
2 499 30.3
3 512 31.9
4 534 34.7
5 534 34.7 ? (but the counter correctly changed)
6 546 36.3
7 538 35.2
8 530 34.2
9 503 30.8
10 431 22.6 ? ( pouch touched newspaper ?)
11 562 38.4
12 206 ( band ruptured...)

That's all so far

All the best from A-Ping

 

I am sorry, but your video will not qualify. On this forum, it has been found that the only reliable set up for velocity measurements using cell phones is the ChronyConnect designed for Android phones. The set up must be exactly as indicated in the following tutorial.

 

http://slingshotforu...setup-tutorial/

 

Note that among other points, the phone must be positioned halfway between the first piece of paper and the second piece of paper. You must follow the directions in the link above exactly. This restriction is very clearly stated in the first post in this thread.

 

Of course you may also use a real chronograph, which is not based on sound wave forms.

 

Cheers .... Charles


Edited by Charles, 02 June 2016 - 05:43 PM.


#426 aiping

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Posted 02 June 2016 - 08:50 PM

Got it...No problem. The inofficial data are on the table and may be tried to be reproduced
from anybody who wants to. This project is closed now for me and there will be
no more application for Power Ranger competition.

All the best from A-Ping

#427 aiping

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Posted 03 June 2016 - 01:28 PM

@Genoa

taking pictures from the band fixing I will post but it not easy as I need my two hands
to wrap the closed office rubber loop into the oval groove whiile the flatband must be kept in place with about 5 mm overlap AND I must shot the photo at the same time...(Yoga!)

Actually I am busy to earn my money AND rearrange the attick back to its normal state
as if you have sawn the shooting video, the empty attick space, all the stuff is cramped behind me at area of 2 x3 meters... had a lot of trouble, if you want marrie don't think only twice...

And I want post photos of method how to make finished strange ammo,cube, cylinder, 4 same surfaces pyramid (still thinking about a pouch which can hold THAT) in 5 minutes, in fact molding takes longer than making the form for lead, aluminium (?), silver (!!?, joking)

A-Ping

#428 Genoa Slingshot

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Posted 03 June 2016 - 11:29 PM

@Genoa
taking pictures from the band fixing I will post but it not easy as I need my two hands
to wrap the closed office rubber loop into the oval groove whiile the flatband must be kept in place with about 5 mm overlap AND I must shot the photo at the same time...(Yoga!)
Actually I am busy to earn my money AND rearrange the attick back to its normal state
as if you have sawn the shooting video, the empty attick space, all the stuff is cramped behind me at area of 2 x3 meters... had a lot of trouble, if you want marrie don't think only twice...
And I want post photos of method how to make finished strange ammo,cube, cylinder, 4 same surfaces pyramid (still thinking about a pouch which can hold THAT) in 5 minutes, in fact molding takes longer than making the form for lead, aluminium (?), silver (!!?, joking)
A-Ping


Hmmm...maybe there is a misanderstanding...
I'd like to see a picture of your attachment system, at the fork and at the pouch, because 9cm and 3,5cm is very large.
Just you have to put the slingshot on the table, take your camera and shot a picture, you don't need any yoga :)
Anyway thank you...

#429 Resigned User

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Posted 03 June 2016 - 11:50 PM

Is it possible to see more pictures of the slingshot?
Maybe you can open a new 3ed for it

#430 Genoa Slingshot

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Posted 04 June 2016 - 12:53 AM

@Genoa
taking pictures from the band fixing I will post but it not easy as I need my two hands
to wrap the closed office rubber loop into the oval groove whiile the flatband must be kept in place with about 5 mm overlap AND I must shot the photo at the same time...(Yoga!)
Actually I am busy to earn my money AND rearrange the attick back to its normal state
as if you have sawn the shooting video, the empty attick space, all the stuff is cramped behind me at area of 2 x3 meters... had a lot of trouble, if you want marrie don't think only twice...
And I want post photos of method how to make finished strange ammo,cube, cylinder, 4 same surfaces pyramid (still thinking about a pouch which can hold THAT) in 5 minutes, in fact molding takes longer than making the form for lead, aluminium (?), silver (!!?, joking)
A-Ping


Hmmm...maybe there is a misanderstanding...
I'd like to see a picture of your attachment system, at the fork and at the pouch, because 9cm and 3,5cm is very large.
Just you have to put the slingshot on the table, take your camera and shot a picture, you don't need any yoga :)
Anyway thank you...
Ok Aping, no problem. I've seen the pictures of your slingshot on the thingiverse link so I understood...thanks :)
It's very intresting system!

#431 aiping

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Posted 04 June 2016 - 06:19 AM

I have an important information:

The estimated draw of 140 cm is not correct!

With 24 cm active bandlength I can only draw 125 to 135 cm.
The draw weight is than 10 to 11.5 kg.

With full draw and steelball in the pouch I simply don't like to look back...
focus on fork/band alignement and clean pouch grip.

I apologize for this mistake, specially to those who are already started trying
out!

Well, another item, as requested, here another picture:

I hope you can better see the like a half tube formed flatband and the attachment
to the fork and pouch.

Last but not least here the download link for dominant left hand:

http://www.thingiver...m/thing:1598585

A-Ping

#432 aiping

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Posted 04 June 2016 - 06:43 AM

Semi-Tube Slingshot 'loaded' with 13 mm steelballs

Attached Thumbnails

  • A-Ping with bands and loaded-3.jpg


#433 Charles

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Posted 04 June 2016 - 10:35 AM

These details and discussion are not really appropriate for the SpeedFreaks thread. Please carry on any further discussion in the General thread.

 

Cheers .... Charles



#434 aiping

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Posted 04 June 2016 - 04:44 PM

@Charles

O.k., got it, will do.

All the best from Aiping




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