## Re: [cw_bugs] Re: slowing bugs--CABLE CLAMP

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• Hi, Buggies - Been lurking for a long time, just listening to the scratchy dots and bug weight threads, and my 2 cents worth has come to the surface. Isaac
Message 1 of 20 , Jun 19, 2007
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Hi, Buggies -

Been lurking for a long time, just listening to the "scratchy dots" and "bug weight" threads, and my 2 cents worth has come to the surface.

Isaac Newton showed long ago that what matters about the effective mass of an object (as far as distant measurements go) is the center of mass.  This is why the law of universal gravitation treats the center-to-center distance between two massive bodies to calculate the gravitational attraction.  From a more earthly point of view (but just as important to a bug enthusiast) is the fact that for any cylindrical weight, whether it is long and thin or short and fat, the center of its mass will be on its long axis and equidistant from either end.  This is the distance from the pendulum spring that matters.

The advantage of a short and fat weight is that it allows for a greater range of speed adjustment because it takes up less space on the pendulum and can be moved further back and forth.  The advantage of a long thin weight is that it is less likely to run into stuff (like terminal posts, damper supports, etc.) as the pendulum swings.  And a long thin weight with a setscrew near one end can be extended out beyond the actual end of the pendulum to provide greater slowing.
When I have finished my current round of bug-building, I intend to work further on a new way to slow a bug - by effectively (but not permanently) reducing the strength of the pendulum spring.  I will report back if I am successful (but probably not if it doesn't work!)

I have enjoyed the bits of bug lore that these posts have provided, and I have done a lot of book marking of interesting sites.  Thanks to all.

73 de Rich, WB9LPU

-----Original Message-----
From: Grover Cleveland
Sent: Jun 19, 2007 9:42 AM
To: cw_bugs@yahoogroups.com
Subject: Re: [cw_bugs] Re: slowing bugs--CABLE CLAMP

Buggies All,

I attached a cable clamp to a standard Vibroplex to conduct tests on the weight's effectiveness. I concluded nothing in terms of speed that isn't obvious.

However, the cable clamp is 1.0 oz. and the standard Vibroplex weight is 0.4 oz. It would have the advantage, in line with the current discussion, of concentrating the weight in one spot on the pendulum.

A photo is attached.

Grover K7TP

On 6/18/07, k4oso <k4oso@...> wrote:

Hi Grover,
Have you conducted any speed tests with your clamp yet? If so, what
kind of results did you yield? Also, will there a picture(s)?
Milt k4oso

--- In cw_bugs@yahoogroups .com, "Grover Cleveland" <clevelandg@. ..>
wrote:
>
> Buggies All,
>
> I bought a large cable clamp of a size I believe is close to the
one used on
> the bug at KPH (http://www.radiomar ine.org/Pictures /HIST-RS- OP-
4.jpg). The
> weight of the cable clamp is 1.0 oz. while the weight of the
standard
> Vibroplex weight is 0.4 oz. That's a significant difference.
>

--
Grover Cleveland K7TP

"Morse - everything else is QRM"

• Hi Grover, Maybe I m the only one to whom its not obvious:-) But, what did you find out about speed, using the clamp? Nice pic....and appears to be
Message 2 of 20 , Jun 19, 2007
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Hi Grover,
Maybe I'm the only one to whom its not obvious:-) But, what did you
find out about speed, using the clamp?
Nice pic....and appears to be historically correct.
73, Milt k4oso

--- In cw_bugs@yahoogroups.com, "Grover Cleveland" <clevelandg@...>
wrote:
>
> Buggies All,
>
> I attached a cable clamp to a standard Vibroplex to conduct tests
on the
> weight's effectiveness. I concluded nothing in terms of speed that
isn't
> obvious.
>
> However, the cable clamp is 1.0 oz. and the standard Vibroplex
weight
> is 0.4oz. It would have the advantage, in line with the current
> discussion, of
> concentrating the weight in one spot on the pendulum.
>
> A photo is attached.
>
> Grover K7TP
>
> On 6/18/07, k4oso <k4oso@...> wrote:
> >
> > Hi Grover,
> > Have you conducted any speed tests with your clamp yet? If so,
what
> > kind of results did you yield? Also, will there a picture(s)?
> > Milt k4oso
> >
> > --- In cw_bugs@yahoogroups.com <cw_bugs%
40yahoogroups.com>, "Grover
> > Cleveland" <clevelandg@>
> > wrote:
> > >
> > > Buggies All,
> > >
> > > I bought a large cable clamp of a size I believe is close to the
> > one used on
> > > the bug at KPH (http://www.radiomarine.org/Pictures/HIST-RS-OP-
> > 4.jpg). The
> > > weight of the cable clamp is 1.0 oz. while the weight of the
> > standard
> > > Vibroplex weight is 0.4 oz. That's a significant difference.
> > >
> >
> >
> >
>
> --
> Grover Cleveland K7TP
>
> "Morse - everything else is QRM"
>
• Milt - What I discovered is that the effect of a one ounce weight at that point is that the speed (on my bug at least) is to reduce the speed to about 25 wpm.
Message 3 of 20 , Jun 19, 2007
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Milt -

What I discovered is that the effect of a one ounce weight at that point is that the speed (on my bug at least) is to reduce the speed to about 25 wpm. With one standard weight (0.4 oz.) out at the end of the pendulum the speed was more like 30+ wpm. Your mileage may vary.

Cheers,

Grover K7TP

On 6/19/07, k4oso <k4oso@...> wrote:

Hi Grover,
Maybe I'm the only one to whom its not obvious:-) But, what did you
find out about speed, using the clamp?
Nice pic....and appears to be historically correct.
73, Milt k4oso

--
Grover Cleveland K7TP

"Morse - everything else is QRM"
• I noticed something else on Les Burger s bug (http://www.radiomarine.org/historic-5.html) that I had not noticed before. It would seem as though there is still
Message 4 of 20 , Jun 19, 2007
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I noticed something else on Les Burger's bug
that I had not noticed before. It would seem as though there is still
a standard Vibroplex weight at the end of pendulum, that is in
addition to the cable clamp. I'll purchase a larger cable clamp (I
think that the one I bought is a size too small) and add a standard
weight at the end of the arm as see what the result is.

Grover K7TP

'sperimentin' with bugs
• I earlier wrote off the McElroy idea. I had attached a flat style 1 oz weight to a .4 oz round weight on my Original using a long nylon screw. I still had
Message 5 of 20 , Jun 20, 2007
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I earlier wrote off the McElroy idea. I had attached a flat style 1
oz weight to a .4 oz round weight on my Original using a long nylon
screw. I still had another .4 oz a little closer. The total weight
was 1.8 oz, from the three weights, was not enough to slow it down.
And the action felt shaky.

On further thought, that really isn't the equilavent of a McElroy
style weight. The extra weight was concentrated above the lever and
there was still two .4 oz weights present. I can't really claim I
tried the McElroy method.

I also found these adjustments are quite complex. There are many ways
to add the weight to slow down a bug. And the same method won't
behave the same way on a different bug.

I've been playing with my Original and found there are so many
interactions. It is too complex for a hobbyist like me to come up
with hard rules.

I'd like to see a photo of the McElroy bug. The idea is intriguing.

I also want to give the cable clamp a try. My Original has a 5/32"
diameter rod. I guess that is the size of cable clamp to look for. I
wonder if a pair of wing nuts would work for quick adjustments. They
might be too close and hit each other. Also a chrome job might be
neat on a cable clamp.

That said, I am sorry about writing off the McElroy weight earlier in
this thread. I am a newbie at bug and was a little impatient at the
results I was getting.

73,

Steve N6VL
• Steve, A very nice photo of a McElroy bug like mine can be seen at http://www.w1tp.com/7627.jpg . 73, Troy, W6HV ... From:
Message 6 of 20 , Jun 20, 2007
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Steve, A very nice photo of a McElroy bug like mine can be seen at  http://www.w1tp.com/7627.jpg  .
73,
Troy, W6HV
----- Original Message -----
From: n6vl
Sent: Wednesday, June 20, 2007 8:00 AM
Subject: [cw_bugs] Re: slowing bugs
----------- I'd like to see a  photo of the McElroy bug. The idea is intriguing. ------------
73,

Steve N6VL

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