Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Wade -
OK. Keep in mind that someone else may have lubed those nylon gears
before, causing them to bind on the shaft. That's a fairly common
problem where someone has oiled them in the past, then someone else has
come along and cleaned them up, but the damage was already done. They
should rotate freely on the shaft.
Drake used wheel bearing grease on the front bearing, which dries out
and crumbles after ONLY 35 years. It can feel like sand or gravel, and
since the primary ground for the lead screw / tuning slug is through
them it can cause the tuning to jump and warble slightly as you tune.
Cleaning out all the old grease and cleaning the lead screw threads with
alcohol does wonders. White lithium grease is good for the bearing, and
a drop of light machine oil on the lead screw are all you need. Do not
lubricate the guide rod or follower finger at the top of the gear box.
That is the secondary ground.
You can also do the grounding braid modification, but I find that really
isn't necessary if the cleaning and lube are done properly.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
wmacleod wrote:
"wmacleod" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Thank-you both Garey and Evan. From your descriptions I expect the units I
have need a small amount of lubrication on the worm gear and main bearings.
I am familiar with the article mentioned below and will be careful not to
contaminate the plastic gears.
Wade
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Garey Barrell
Sent: April 18, 2008 5:21 PM
To: [EMAIL PROTECTED]
Subject: Re: [drakelist] C-Line PTO Friction Question
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Wade -
I have owned / worked on a LOT of 4 Series units since about 1964, and
I've never come across one that would 'spin' the way the old Hammarlund
and Hallicrafters flywheel driven dials would.
They should however be easily tuned by resting your finger on the side
of the knob (or in the button on the C Line) and moving your finger in a
circle.
The PTO is driven directly by the lead screw and follower within the
"gearbox" at the front of the PTO. All the gears are there solely to
drive the dial disc(s).
An excellent article on the foibles of this arrangement is at:
<http://www.wb4hfn.com/DRAKE/DrakeArticles/PTO/Drake_PTO.htm>
The article is based on the C Line, but is applicable to all the 4 units
that use the nylon gears. The big "secret" is that nylon gears are
designed to run _DRY_ , i.e., no lubrication at all, especially
petroleum based lubricants.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
H D MAC LEOD wrote:
"H D MAC LEOD" <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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Hi Drakelist.
I am interested in understanding how smooth the Drake C Line dial
mechanisms were when the product was originally shipped from the
factory. Perhaps some of you are original owners of C Line equipment
and would comment?
I have read that "The dial mechanism should offer only slight
resistance to the tuning knob. You should be able to fast spin the
tuning knob by placing your index finger on the outside of the knob
and rotating your hand."
Is this technically correct? I have a couple of C-Line units from
different sources where the dial mechanisms are identical and smooth
but definitely not free finger spinning as described above.
Wade VA3HM
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