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length of a rubber bands

Thread Status: Hello , There was no answer in this thread for more than 60 days.
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sasa

Member
Sep 14, 2013
13
1
13
Hi,
I'm trying to make my own wooden speargun. Does enyone knows how to calculate the length of a bands.
Thanks
 
See here:

[ame=http://www.youtube.com/watch?v=ppFgEyra_r8]How To Make Speargun Rubbers - YouTube[/ame]

starting with second '47.

Good luck!
 
Cool, Thanks

I'm waiting parts from montenegro, till then i'm making a wooden blank 56 x 45mm. combination of teak and mahagoni, 8 x 7mm with carbon fiber between laminate.

Thanks again
how was the first one
 
1. Measure the distance from the middle of the
band slot to the center cocking tab.

2. Double the distance ( for both sides of the gun )

3. Subtract the length of the wish bone. (Alexander and Riffe's are
approx 6", Daryl Wong uses about 3".)

4. Divide the number by 3 1/2.

5. This is the length of your powerband if you are using a standard 3 1/2
: 1 stretch ratio. This is a measurement of the powerband from knot to
knot. For actual rubber length, add 1" to this length or 1 1/2" in you
are tapering the ends of the powerbands.

If you have separate holes for each band as with the newer Aimrite/Wong muzzles, then rather than measuring from the center of the band slot (you don't have a slot) to the middle tab, measure from each hole to the appropriate tab, and you will have a different band length for each hole.
 
sasa said:
Cool, Thanks

I'm waiting parts from montenegro, till then i'm making a wooden blank 56 x 45mm. combination of teak and mahagoni, 8 x 7mm with carbon fiber between laminate.

Thanks again
how was the first one
Click to expand...

duzinu guma obracunavas ovako:

16mm koeficijent oko 3.3 do 3,5
14mm " od 3,5 do 4,00
19mm " oko 3,0

duzinu od lezista gume do mesta zapinjanja delis sa koficijentom ako je cirkularna x 2 plus 3 cm za vezivanje ogive


primer puska duzine 100cm deljeno sa 3,3 za gumu 16mm = 30cm puta 2 =60 plus 3cm = 63cm za cirkularnu gumu

ako ti nije jasno pitaj pozzzzzzz
 

super..hvala ti. Gume su zute iz motimare-a Budva.. prvi put pravim pusku pa neznam skoro nista... valjda su to cirkularne,, pozdrav
 
sasa said:
super..hvala ti. Gume su zute iz motimare-a Budva.. prvi put pravim pusku pa neznam skoro nista... valjda su to cirkularne,, pozdrav
Click to expand...

zute su ti oid prirodnog kaucuka malo su osetljivije nego od sintetskog,najbolje ti je uzeti iznutra zute okolo crne ili crvenkaste ili plave rob allen, ja sam uzeo iste u budvi za moj oceanborn za ogivu koristi dajnemu od 2mm jer je rupa malo sira nego na drugim gumama pozzzz
 
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