[TowerTalk] Motorized Winch for US Tower

[KB1STH-Ivan Shapiro]

>From the excellent notes from list respondents what I think I should get is
the correct motor/winch/worm-gear assembly for "laying-over" my US Tower HDX
589.  I would want to mount it to the rasing-lowering fixture, which I have
left on the base ad tower.  For sure I would only want to activate this at
the tower and NOT remotely.  

If anyone has suggestions (which I may have missed-sorry) for the make and
model or part number for the motor/winch/worm-gear etc, please let me know
either on the list or directly to me at 
WK1W at ivanshapiro.com.  Thanks and 73
Ivan 

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Subject: TowerTalk Digest, Vol 121, Issue 5

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Today's Topics:

   1. 25G Wanted (Bud Kozloff)
   2. Re: Motorized Winch for US Tower (Richard (Rick) Karlquist)
   3. Re: Motorized Winch for US Tower (Grant Saviers)


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Message: 1
Date: Thu, 3 Jan 2013 08:28:40 -0500
From: Bud Kozloff <W1NSK at Hotmail.com>
To: towertalk at contesting.com
Subject: [TowerTalk] 25G Wanted
Message-ID: <BLU0-SMTP4365D1ADCE5A4AC6EC9119DFF210 at phx.gbl>
Content-Type: text/plain; charset="ISO-8859-1"; format=flowed

I am looking for 3 10' sections of used 25G in reasonable condition.
Pick up 50 miles of Redding CT (in Fairfield County, 06896)
Must be on ground ready to go.


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Message: 2
Date: Thu, 03 Jan 2013 08:14:17 -0800
From: "Richard (Rick) Karlquist" <richard at karlquist.com>
To: K8RI <K8RI-on-TowerTalk at tm.net>
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] Motorized Winch for US Tower
Message-ID: <50E5AE59.7080603 at karlquist.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed



On 1/2/2013 9:40 PM, K8RI wrote:

>
> I think the point to remember is that drill motors are not designed for
> continuous duty, not even the heavy duty ones. I burned up a brand new,
> heavy duty Dewalt hammer drill, drilling 3/4" holes in a guy anchor
> brace in under 5 minutes.

I have to rest my Milwaukee drill and use it at about 1/3 to 1/2 duty
cycle because it gets hot.  I haven't burned it out, but it loses a
lot of power when hot.  This is find because it keeps the winch from
overheating too.

I am a lot more worried about the winch failing than the drill failing.
A failed drill does not put the tower at risk.  And in a motorized 
winch, the motor does not put the tower at risk in any event.  What
I am worried about in a motorized winch is any sort of "brake" that
may fail.  I think you still want a worm drive in a motorized winch
as a safety mechanism.

Rick N6RK


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Message: 3
Date: Thu, 03 Jan 2013 08:16:10 -0800
From: Grant Saviers <grants2 at pacbell.net>
To: K8RI <K8RI-on-TowerTalk at tm.net>
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] Motorized Winch for US Tower
Message-ID: <50E5AECA.6070409 at pacbell.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed


> I think the point to remember is that drill motors are not designed 
> for continuous duty, not even the heavy duty ones. I burned up a brand 
> new, heavy duty Dewalt hammer drill, drilling 3/4" holes in a guy 
> anchor brace in under 5 minutes.
A tough gig, hard on the body and the drill.
>
> If you look at the motor driven winches, they use a monstrous step 
> down through spur gears which puts very little load on the motor just 
> as in the ham series of rotators.  The motor itself has so little 
> torque you can stall it with the pressure from one finger. Drill 
> motors OTOH provide considerable torque, but generally for a short 
> period as the motor is small and is not very efficient at getting rid 
> of heat. The larger rotators using a double worm gear have a  motor 
> capable of substantial torque although the double worm gear multiplies 
> the torque substantially.
The "Hole Hawg" is geared way down and I think will handle long on time 
duty cycles.  It's designed for drilling through lots of studs for piping.
>
> Variable speed Drill motors develop substantial heat when operated at 
> low speeds/RPM under load. they can not get rid of the heat 
> efficiently at low RPM and cooling is critical for these small 
> motors.  Two speed drills use gears and run the motor at full speed so 
> they have better cooling.
Here is my favorite, torque that can hurt, 2 speeds for metal or wood.  
I've drilled dozens of 9/16" holes in 3/8 steel plate non-stop using 
split point cobalt drills.  It wasn't fun.  A Mag-Drill would have made 
it easier but was too heavy to schlep to the remote site.

http://www.milwaukeetool.com/tools/rotary-hammers-and-hammer-drills/hammer-d
rills-corded/1-2-inch-dual-speed-hammer-drill-kit/5387-22 

$180 at HD.

It is also very fast as a hammer drill in concrete, but you need a top 
quality carbide drill bit and some luck in missing the rebar.

Grant KZ1W



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