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RE: [Losmandy_users] Correct play in RA after OPWB installation


Feb 7 4:30 PM

 


----------------------------

#47993 Feb 7 4:30 PM

I just installed the OPWB. It seems like the RA axis has a lot of play

(maybe 5 mm at the end of the counterweight). How much should it have?



Adjusting the block more tightly causes a distinct scrapping noise when I

rock the RA axis. I backed the block away from the RA gear using the T

until just the point where the scrapping stops.





Rob Hawley



----------------------------

#48004 Feb 8 12:01 PM

Rob,

Your experience is similar to mine. The scraping nose is probably because

the mesh is too tight. The reason the mesh is too tight is because there is

still too much end to end play in the worm, consequently to minimize end

play you have over tightened the worm mesh. To get it right, I had to push

the bearing blocks as tightly together as I possibly could by hand and lock

them down. It turned out that even after squeezing them down on the worm as

hard as I could by hand there was still enough clearance for the worm to

turn smoothly. Once I had eliminated as much end play as possible, I could

then get the requited 2 mm of end play at the end of the counterweight shaft

and there was none of the scraping that would indicate too tight mesh. The

other potential problem is with the coupler. The set screws have to be

super tight in order to avoid the coupler slipping because there is no flat

on the shafts. If you do not get the coupler set screws exceptionally tight

an out of balance condition with the mount will allow the coupler to slip.

Once you get everything installed correctly, there is a great deal of

improvement with the OPWB.

Steve ----- Original Message -----

From: "Rob Hawley" rob@...>

To: Losmandy_users@yahoogroups.com>

Sent: Monday, February 07, 2011 4:30 PM

Subject: [Losmandy_users] Correct play in RA after OPWB installation





>I just installed the OPWB. It seems like the RA axis has a lot of play

> (maybe 5 mm at the end of the counterweight). How much should it have?

>

> Adjusting the block more tightly causes a distinct scrapping noise when I

> rock the RA axis. I backed the block away from the RA gear using the T

> until just the point where the scrapping stops.

>

>

> Rob Hawley

>

>

>

>

>

---------------

>

> Yahoo! Groups Links

>

>

>



----------------------------

#48005 Feb 8 12:03 PM

What Steve said!



When I installed mine I also removed the crown gear and cleaned it up with a

light detergent. Then I regreased the entire setup with super lube.



Jared

On Tue, Feb 8, 2011 at 2:01 PM, Steve bullfox@...> wrote:



>

>

> Rob,

> Your experience is similar to mine. The scraping nose is probably because

> the mesh is too tight. The reason the mesh is too tight is because there is

>

> still too much end to end play in the worm, consequently to minimize end

> play you have over tightened the worm mesh. To get it right, I had to push

> the bearing blocks as tightly together as I possibly could by hand and lock

>

> them down. It turned out that even after squeezing them down on the worm as

>

> hard as I could by hand there was still enough clearance for the worm to

> turn smoothly. Once I had eliminated as much end play as possible, I could

> then get the requited 2 mm of end play at the end of the counterweight

> shaft

> and there was none of the scraping that would indicate too tight mesh. The

> other potential problem is with the coupler. The set screws have to be

> super tight in order to avoid the coupler slipping because there is no flat

>

> on the shafts. If you do not get the coupler set screws exceptionally tight

>

> an out of balance condition with the mount will allow the coupler to slip.

> Once you get everything installed correctly, there is a great deal of

> improvement with the OPWB.

> Steve

> ----- Original Message -----

> From: "Rob Hawley" rob@...>

> To: Losmandy_users@yahoogroups.com>

> Sent: Monday, February 07, 2011 4:30 PM

> Subject: [Losmandy_users] Correct play in RA after OPWB installation

>

> >I just installed the OPWB. It seems like the RA axis has a lot of play

> > (maybe 5 mm at the end of the counterweight). How much should it have?

> >

> > Adjusting the block more tightly causes a distinct scrapping noise when I

> > rock the RA axis. I backed the block away from the RA gear using the T

> > until just the point where the scrapping stops.

> >

> >

> > Rob Hawley

> >

> >

> >

> >

> >

---------------

> >

> > Yahoo! Groups Links

> >

> >

> >

>

>

>





[Non-text portions of this message have been removed]



----------------------------

#48008 Feb 8 1:45 PM

I think the scrapping noise was just because the worm was too tight onto the

RA gear. The noise happened as I was manually jiggling the RA axis. I

backed the block back in a manner similar to what you described and that

eliminated the noise.



It's hard to evaluate the play. I tried holding a ruler to the end of the

counterweight, but I am not sure if I am measuring me moving or the play. I

thought I had read about the 2mm target but did not find the reference

yesterday. If I have to adjust the worm again I'll use a laser.



Anyway last night I fired it up after adjusting it. It sounds better when

running. I have not run PEMPRO yet so I don't know how much it improved

things. I did a preliminary run when I originally assembled it and the 76

sec bump was missing. Before the OPWB there was a significant bump at 76

sec.





Rob Hawley



From: Steve [mailto:bullfox@...]

Sent: Tuesday, February 08, 2011 12:01 PM

To: Losmandy_users@yahoogroups.com

Subject: Re: [Losmandy_users] Correct play in RA after OPWB installation



.

Rob,

Your experience is similar to mine. The scraping nose is probably because

the mesh is too tight. The reason the mesh is too tight is because there is

still too much end to end play in the worm, consequently to minimize end

play you have over tightened the worm mesh. To get it right, I had to push

the bearing blocks as tightly together as I possibly could by hand and lock

them down. It turned out that even after squeezing them down on the worm as

hard as I could by hand there was still enough clearance for the worm to

turn smoothly. Once I had eliminated as much end play as possible, I could

then get the requited 2 mm of end play at the end of the counterweight shaft



and there was none of the scraping that would indicate too tight mesh. The

other potential problem is with the coupler. The set screws have to be

super tight in order to avoid the coupler slipping because there is no flat

on the shafts. If you do not get the coupler set screws exceptionally tight

an out of balance condition with the mount will allow the coupler to slip.

Once you get everything installed correctly, there is a great deal of

improvement with the OPWB.

Steve ----- Original Message -----

From: "Rob Hawley" rob@...>

To: Losmandy_users@yahoogroups.com>

Sent: Monday, February 07, 2011 4:30 PM

Subject: [Losmandy_users] Correct play in RA after OPWB installation



>I just installed the OPWB. It seems like the RA axis has a lot of play

> (maybe 5 mm at the end of the counterweight). How much should it have?

>

> Adjusting the block more tightly causes a distinct scrapping noise when I

> rock the RA axis. I backed the block away from the RA gear using the T

> until just the point where the scrapping stops.

>

>

> Rob Hawley

>

>

>

>

>

---------------

>

> Yahoo! Groups Links

>

>

>







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