John,
To the reason that you don't lube the first knot -- it is because as you shorten the loop, nicks or tears that might develop will be on the *outside* of the loop?
This is in contrast to the second knot, which you lube. As you pull the second knot against the first, nicks that might form would be on the inside of the loop, which must be avoided.
Did I get that correct? Thanks.
I always lightly lube the rubber for both knots, but I will give yours a try.
-Kang
--- In Indoor_Construction_at_yahoogroups.com, "John Kagan" <john_kagan@...> wrote:
>
> I've used hemostats to tie thread knots (which didn't work well for me), but this is a great idea to use them for rubber knots.
>
> My current process for "exact weight" motors is:
>
> - cut overweight loop
> - add O rings and tie with one overhand knot, unlubed
> - pull the knot down, trim the ends, weigh, repeat until desired weight
> - CA the ends
> - lube
> - tie overhand knot in the other direction on the inside of existing knot
> - pull it up tight
>
> --- In Indoor_Construction_at_yahoogroups.com, "ray_harlan" <rbharlan@> wrote:
> >
> > Something that I have been doing lately, and I don't claim to have invented it, is to use hemostats to hold the ends of the rubber together. Follow Bill's technique but clamp the hemostat to just cover the ends of the rubber strands. Then pull the knot up to the hemostat tightly by spreading the two strands. Put in a second knot and pull it up to the first. When the hemostats are released, just the right amount of loose ends are left and no tweaking to get the right weight is needed.
> >
> > Ray
> >
> >
> > --- In Indoor_Construction_at_yahoogroups.com, "Bill Gowen" <wdgowen@> wrote:
> > >
> > > I never had much success with this idea - probably has something to do with saliva quality. I lube lightly before tying then use two overhand knots.
> > >
> > > Old story but maybe some haven't heard it yet:
> > >
> > > To make an exact weight motor, cut strip to desired width but a little over the desired weight, lube, put on o-rings, put on scale, cut off strip to exact desired weight. Tie one overhand knot as close as possible to end of motor, then spread the strands to move the knot as close as possible to the end of the motor. Tie a second overhand (or underhand) knot inside of the first one and spread the strands to move the second knot tight against the first one.
> > >
> > > This procedure looks brutal but I've never heard of anyone having problems from it.
> > >
> > > ----- Original Message -----
> > > From: Neil Dennis
> > > To: construction Indoor
> > > Sent: Saturday, March 05, 2011 9:02 AM
> > > Subject: [Indoor_Construction] knotting rubber
> > >
> > >
> > >
> > > Just wondering, when I show the students know tying, I have them soak
> > > the knot with saliva before pulling it tight and lubing, rarely get a
> > > break at the knot and it really pulls up tight. Anyone here do this ?
> > >
> > > wombat
> > >
> >
>
Received on Tue Mar 08 2011 - 09:08:36 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET