I do one other thing when making motors. I try to err on the heavy side at first. If the motor comes out too heavy, I just tie another overhand knot to the inside of the pair of knots. Then I snug the third knot up against the other two and cut off the strands sticking out of the outer knot. That cut is as close as I can get to the outer knot and the knot usually just pops apart leaving the correct, short length of rubber sticking out.
One other trick helps to keep the lubed knots from untying. I alternate my overhand knots, one over-under and the next under-over. That way the knots do not nest and they tend to tighten each other when stressed.
Leo
Bloomington IN
--- 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 Sat Mar 05 2011 - 10:27:24 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET