[R-390] pinned down

Tue Jun 19 14:49:05 EDT 2012

If youre tryong to service the pto then it may be possible to remove the whole assembly.
.gears and cosmos from the device. Then the gear assy might be removed from the pto. If the pto shaft is held with a screw or clamp it can be loosened. If you need to remove the pto cover it should be possible while leaving the gears in place. You can google my aeticle called "journey through the cosmos" for more info.
Jim n4be
-- 
Sent from my Android phone with K-9 Mail. Please excuse my brevity.

r-390-request at mailman.qth.net wrote:

Send R-390 mailing list submissions to
	r-390 at mailman.qth.net

To subscribe or unsubscribe via the World Wide Web, visit
	http://mailman.qth.net/mailman/listinfo/r-390
or, via email, send a message with subject or body 'help' to
	r-390-request at mailman.qth.net

You can reach the person managing the list at
	r-390-owner at mailman.qth.net

When replying, please edit your Subject line so it is more specific
than "Re: Contents of R-390 digest..."

Today's Topics:

1. Pinned Down - advice needed (Chris Kepus)
2. Re: Pinned Down - advice needed (Barry)
3. Re: Pinned Down - advice needed (Steve Byan)

_____________________________________________

Message: 1
Date: Mon, 18 Jun 2012 20:02:34 -0700
From: "Chris Kepus" <ckepus at comcast.net>
Subject: [R-390] Pinned Down - advice needed
To: <r-390 at mailman.qth.net>
Message-ID: <000001cd4dc7$f9ec0e40$edc42ac0$@net>
Content-Type: text/plain;	charset="us-ascii"

Various refurb and repair projects are underway in preparation (practice)
for a newbie to tackle the BIG ONE...a R-390A. 

Here's the latest. I'm working on a device that has a Cosmos PTO, a close
relative to that which in our R-390's, that is driven by a rather
interesting geared system. 

To get to the point of my inquiry, a number of the gears and levers are
pinned through their hub to the PTO shaft or idler shafts with mighty small
diameter pins. Based on recent advice given to another refurb newbie, pins
found in the R-390A gear train, can be a pain in the gear, I mean rear, even
a show stopper. I need to remove the tiny diameter pins holding the gears
and lever on the PTO shaft. 

Where does one buy the extremely small diameter super strong punches? Has
anyone devised a "best" way to remove the pins? Heating the hub?, soaking
with penetrant?, drilling 'em out, etc. Yes, I've considered cutting them
off with a Dremel with cutting wheel but it would be rather difficult to do
so without collateral damage.

If you'd like to see the gears, please Google "ME-398/U", go to the photos
on Flickr, check out the PTO and close up pics of the gears and levers that
are pinned.

Thanks for any and all ideas. 
Chris
W7JPG 

PS - OT: Is there anyone on this reflector that worked for Cosmos in the
late 70's and 80's? Please contact me direct.

_____________________________________________

Message: 2
Date: Mon, 18 Jun 2012 23:47:25 -0400
From: Barry <n4buq at knology.net>
Subject: Re: [R-390] Pinned Down - advice needed
To: <r-390 at mailman.qth.net>, "Chris Kepus" <ckepus at comcast.net>
Message-ID: <58974.1340077645 at knology.net>
Content-Type: text/plain; charset="utf-8"

I'm going to guess those are roll pins and they're not too difficult to drive out. You can get pin punches to do that (not sure where you'd get one but try McMaster if you really want one). You could probably get them out with a small brad or finishing nail of the correct size. You might want to blunt the end of a nail first, though, as the point might tend to expand the roll pin.

Good luck,
Barry - N4BUQ

On Mon 18/06/12 10:02 PM , "Chris Kepus" ckepus at comcast.net sent:
> Various refurb and repair projects are underway in preparation
> (practice)for a newbie to tackle the BIG ONE...a R-390A. 
> 
> Here's the latest. I'm working on a device that has a Cosmos PTO, a
> closerelative to that which in our R-390's, that is driven by a rather
> interesting geared system. 
> 
> To get to the point of my inquiry, a number of the gears and levers are
> pinned through their hub to the PTO shaft or idler shafts with mighty
> smalldiameter pins. Based on recent advice given to another refurb newbie,
> pinsfound in the R-390A gear train, can be a pain in the gear, I mean rear,
> evena show stopper. I need to remove the tiny diameter pins holding the
> gearsand lever on the PTO shaft. 
> 
> Where does one buy the extremely small diameter super strong punches?
> Hasanyone devised a "best" way to remove the pins? Heating the hub?,
> soakingwith penetrant?, drilling 'em out, etc. Yes, I've considered cutting
> themoff with a Dremel with cutting wheel but it would be rather difficult to
> doso without collateral damage.
> 
> If you'd like to see the gears, please Google "ME-398/U", go to the
> photoson Flickr, check out the PTO and close up pics of the gears and levers
> thatare pinned.
> 
> Thanks for any and all ideas. 
> Chris
> W7JPG 
> 
> PS - OT: Is there anyone on this reflector that worked for Cosmos in
> thelate 70's and 80's? Please contact me direct.
> 
> 
> 
> 
>_____________________________________________

> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390Help: http://mailman.qth.net/mmfaq.htmPost: R-390 at m
> ailman.qth.net
> This list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.html
> 
> 

_____________________________________________

Message: 3
Date: Tue, 19 Jun 2012 11:58:32 -0400
From: Steve Byan <stevebyan at verizon.net>
Subject: Re: [R-390] Pinned Down - advice needed
To: Chris Kepus <ckepus at comcast.net>
Cc: r-390 at mailman.qth.net
Message-ID: <ED12B056-9527-4C21-8268-7593F580F6E6 at verizon.net>
Content-Type: text/plain; charset=us-ascii

On Jun 18, 2012, at 11:02 PM, Chris Kepus wrote:

> Where does one buy the extremely small diameter super strong punches? Has
> anyone devised a "best" way to remove the pins? Heating the hub?, soaking
> with penetrant?, drilling 'em out, etc. Yes, I've considered cutting them
> off with a Dremel with cutting wheel but it would be rather difficult to do
> so without collateral damage.

Are they dowel pins or roll pins?

Here's some sources for pin punches for dowel pins:

<http://www.amazon.com/General-Tools-SPC75-Drive-8-Piece/dp/B00004T7RT>;

<http://www.amazon.com/Starrett-S565WB-Drive-Punch-Pieces/dp/B00008IHTJ/ref=pd_sbs_indust_2>;

<http://www.micromark.com/pin-pusher,10283.html>;

<http://www.micromark.com/press-it-precision-arborandpunch-press,9309.html>;

<http://www.mcmaster.com/#pin-punches/=i1o76u>;

-- 
Steve Byan <stevebyan at me.com>
Littleton, MA 01460

_____________________________________________

_____________________________________________

R-390 mailing list
R-390 at mailman.qth.net
http://mailman.qth.net/mailman/listinfo/r-390

End of R-390 Digest, Vol 98, Issue 16
*************************************