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Author Topic: Bending the end of a needle  (Read 1645 times)

Offline Leester

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Bending the end of a needle
« on: July 03, 2006, 11:10:00 PM »
I received an order which included NVA's. The needles came straight with no bend on the end. How do you bend these without screwing up the threads?  Thanks
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Offline Mike Greb

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Re: Bending the end of a needle
« Reply #1 on: July 04, 2006, 06:32:32 AM »
I chuck up my needles in a lathe chuck and wack on them with a rubber mallet. ;D
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Offline Patrick Rowan

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Re: Bending the end of a needle
« Reply #2 on: July 04, 2006, 10:28:23 AM »
"I chuck up my needles in a lathe chuck and wack on them with a rubber mallet. "

I have a rubber mallet. Can I barrow your lathe?  :)
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Offline Bill Little

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Re: Bending the end of a needle
« Reply #3 on: July 04, 2006, 10:37:29 AM »
Quote from: Leester on July 03, 2006, 11:10:00 PM
I received an order which included NVA's. The needles came straight with no bend on the end. How do you bend these without screwing up the threads?  Thanks

Hi lee,

With the PA Needles, I hold them between my left thumb and forefinger then take a pair of snipe nose pliers and bend them where I want to, usually about 1/4" lever.  Never seemed to be a problem. (??)

Bill <><
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Big Bear <><

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Offline Leester

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Re: Bending the end of a needle
« Reply #4 on: July 04, 2006, 11:19:19 AM »
Thanks Bill: I just wanted to make sure I could bend them without heating them. They won't work in my wire bender, Randy emailed and said they where not brittle, don't want to mess them all up.
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Offline Jim Oliver

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Re: Bending the end of a needle
« Reply #5 on: July 04, 2006, 06:09:02 PM »
Measure Twice---Bend Once!! **)

Jim Oliver
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Offline Scott Jenkins

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Re: Bending the end of a needle
« Reply #6 on: July 10, 2006, 11:50:27 AM »
Do not bend it, n1 just solder a wheel collar to the needle and cut off what you do not need.  :!

Scott
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m) During the refuelling and the restart of the motor, and until the time when he releases the model aircraft, the mechanic must keep the model aircraft in contact with the ground by at least one point and with the centre line outside the flight circle. During that time the pilot must be crouching or sitting inside the centre circle. He keeps one hand on the ground and his handle and his lines as close to the ground as defined by the F2C panel of judges until the model aircraft starts again.

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Re: Bending the end of a needle
« Reply #7 on: July 11, 2006, 09:24:53 PM »
My Super Tiger Needles are actually quite soft. I think it makes sense, since they ride in a brass spraybar.
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Offline Steve Helmick

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Re: Bending the end of a needle
« Reply #8 on: July 12, 2006, 11:51:01 PM »
When I bought Danny Dirt's old ST G.51 (in the Mutant Magnum), it had a ST spraybar assembly, no bend on the needle. It had a pinion gear (aluminum!) from some R/C car for a knob. Set screw held it fine, with some locktite.

I thought this was a cool idea, so when I setup my DS .60bb with a Randy Aero NV assembly for the "Lancer", I did the same thing. Out flying one day, the ST NV snapped off at the spraybar. Hmmm. A few weeks later, the Randy NV snapped off at the spraybar.

I'm in a quandry. I know that the imbalance of the bent 'handle' on the NV is what makes them tend to rotate. Plus, the knob (pinion gear) is easier to use, less awkward, therefore less danger of putting your fingers into the prop. But the darned things break off the NV. Anybody got a good solution...a knob that doesn't weigh anything? I expect I'll have to shorten the NV as much as possible. Might also consider a non-needle mixture control valve (pinch fuel line, like the R/C in-flight systems), with a micro screw adjuster vs. servo.

Uhhhh...I use a TF magnetic prop balancer, engines didn't come loose. Also, how to get the broken NV out of the spraybar?  n~ Steve
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Offline Bill Little

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Re: Bending the end of a needle
« Reply #9 on: July 13, 2006, 10:32:00 AM »
I always bend about a 1/4" turn on my needles.  I was wary of putting a "weight" on the end of the needle for the reasons Steve has mentioned.  Plus no one around here uses a knob anyway.  Including Randy Smith.

With the nylon seal lock nut on Randy's NVAs I have not experienced any loosening of the needle.  And the needle is easy to turn!  Now, ST's are  another story.  Get them tight enough to seal and you can't turn them!  **)

Randy's are only finger tight. (my fingers)

Bill <><
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Big Bear <><

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Offline Steve Helmick

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Re: Bending the end of a needle
« Reply #10 on: July 13, 2006, 06:24:06 PM »
The "funny" thing is, the pinion gears don't weigh hardly anything. I'm thinking that if I was to cut off enough of the NV so that the weight of what I cut off is the same as the pinion gear, it should be same-same...yes?

Randy's spraybar assembly is truly a work of art, and exactly like Bill says...no problem turning the NV, and no moving. You can really get the collet set tight and still be able to adjust it easily. Also worth every dollar, IMO. Made by Henry Nelson.  y1 Steve
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"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline Bill Little

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Re: Bending the end of a needle
« Reply #11 on: July 13, 2006, 09:11:54 PM »
Hi Steve,

I think it is a "resonance" issue.  The subtle vibrations of even our smoothest engines today when continuously resonating through the needle with "any" weight on the "pendulum" can lead to fatigue of the metal.  The "bending and pulsing" is done at the point of attachment, causing the metal to fatigue there and eventually breaking.  The relatively "soft" nature of the metal used might contribute to the flexing, speeding up the process.

Bill <><
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Big Bear <><

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James Hylton Motorsports/NASCAR/ARCA

AMA 95351 (got one of my old numbers back! ;D )

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