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Re: Ovision worm adjustments


Mar 20, 2009

 


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

#42164 Mar 20, 2009

Hi,



Has anyone written up tips on adjusting/tuning a mount with the Ovision worm? I've had mine about 6 months and it was working great, but now I'm getting sudden jumps of several arc-seconds, which might be related to the warmer weather now. I plan to work on it this weekend, so I'm looking for any pointers beyond the instructions that come from Ovision. It's been a year since I last dismantled and cleaned my G-11, so maybe it's time to do this again?



Thanks,

-Joe



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

#42166 Mar 20, 2009

Hi Joe,

Well, I can tell you that as it warms up, the worm gets tighter and that could cause the jumps you describe.



In my write-up on the MC Mod, I did not get into the adjustment of the worm, mainly because that had be discussed here as I recall.

I can tell you that you want to adjust it warm because that will be the tight lash. I use about 1mm movement at the end of the weight shaft warm or 2mm when cold for a lash measurement, which is what OVision recommends.



There is only a little adjustment available on the Oldham coupler side, so I do try to get the gap between the two ends of the block and the mount to be as close to equal as possible and still get the play at the end of the shaft that I want. I measure this with feeler gauges.



Another thing to look at is possible contamination of the grease on the worm and wheel. If just a bit of grit gets in there, there will be a jump when you hit the grit. You might want to clean off the old grease and apply new grease just to be sure. Then go ahead and adjust the worm again when it is warm, room temperature. Be aware that if you adjusted it at say 70f and the mount gets to 100f it will be tight. But for most of us the temperature at night when we are actually using the mount will be at or below the 70f, except during the summer here in the desert that is! :^) But if you have 1mm of lash then it should still be OK at a higher temp as I only see about 1mm change between quite cold and warm temperatures.



Every place is different, so these measurements are just a suggestion and your area may require a slightly different setup.

Floyd

--- In Losmandy_users@yahoogroups.com, "Joe Ulowetz" joe.ulowetz@...> wrote:

>

> Hi,

>

> Has anyone written up tips on adjusting/tuning a mount with the Ovision worm? I've had mine about 6 months and it was working great, but now I'm getting sudden jumps of several arc-seconds, which might be related to the warmer weather now. I plan to work on it this weekend, so I'm looking for any pointers beyond the instructions that come from Ovision. It's been a year since I last dismantled and cleaned my G-11, so maybe it's time to do this again?

>

> Thanks,

> -Joe

>



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

#42167 Mar 20, 2009

Floyd,

Thanks for the suggestions!

-Joe

--- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@...> wrote:

>

> Hi Joe,

> Well, I can tell you that as it warms up, the worm gets tighter and that could cause the jumps you describe.

>

> In my write-up on the MC Mod, I did not get into the adjustment of the worm, mainly because that had be discussed here as I recall.

> I can tell you that you want to adjust it warm because that will be the tight lash. I use about 1mm movement at the end of the weight shaft warm or 2mm when cold for a lash measurement, which is what OVision recommends.

>

> There is only a little adjustment available on the Oldham coupler side, so I do try to get the gap between the two ends of the block and the mount to be as close to equal as possible and still get the play at the end of the shaft that I want. I measure this with feeler gauges.

>

> Another thing to look at is possible contamination of the grease on the worm and wheel. If just a bit of grit gets in there, there will be a jump when you hit the grit. You might want to clean off the old grease and apply new grease just to be sure. Then go ahead and adjust the worm again when it is warm, room temperature. Be aware that if you adjusted it at say 70f and the mount gets to 100f it will be tight. But for most of us the temperature at night when we are actually using the mount will be at or below the 70f, except during the summer here in the desert that is! :^) But if you have 1mm of lash then it should still be OK at a higher temp as I only see about 1mm change between quite cold and warm temperatures.

>

> Every place is different, so these measurements are just a suggestion and your area may require a slightly different setup.

> Floyd

>

> --- In Losmandy_users@yahoogroups.com, "Joe Ulowetz" joe.ulowetz@> wrote:

> >

> > Hi,

> >

> > Has anyone written up tips on adjusting/tuning a mount with the Ovision worm? I've had mine about 6 months and it was working great, but now I'm getting sudden jumps of several arc-seconds, which might be related to the warmer weather now. I plan to work on it this weekend, so I'm looking for any pointers beyond the instructions that come from Ovision. It's been a year since I last dismantled and cleaned my G-11, so maybe it's time to do this again?

> >

> > Thanks,

> > -Joe

> >

>



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

#42172 Mar 20, 2009

Floyd,



Where are you using a feeler gauge? I don't have my worm yet so I don't have an idea of what you're measuring or how you're doing it.



Can you elaborate?



Thanks.





--- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@...> wrote:

>

> Hi Joe,

> Well, I can tell you that as it warms up, the worm gets tighter and that could cause the jumps you describe.

>

> In my write-up on the MC Mod, I did not get into the adjustment of the worm, mainly because that had be discussed here as I recall.

> I can tell you that you want to adjust it warm because that will be the tight lash. I use about 1mm movement at the end of the weight shaft warm or 2mm when cold for a lash measurement, which is what OVision recommends.

>

> There is only a little adjustment available on the Oldham coupler side, so I do try to get the gap between the two ends of the block and the mount to be as close to equal as possible and still get the play at the end of the shaft that I want. I measure this with feeler gauges.

>

> Another thing to look at is possible contamination of the grease on the worm and wheel. If just a bit of grit gets in there, there will be a jump when you hit the grit. You might want to clean off the old grease and apply new grease just to be sure. Then go ahead and adjust the worm again when it is warm, room temperature. Be aware that if you adjusted it at say 70f and the mount gets to 100f it will be tight. But for most of us the temperature at night when we are actually using the mount will be at or below the 70f, except during the summer here in the desert that is! :^) But if you have 1mm of lash then it should still be OK at a higher temp as I only see about 1mm change between quite cold and warm temperatures.

>

> Every place is different, so these measurements are just a suggestion and your area may require a slightly different setup.

> Floyd

>

> --- In Losmandy_users@yahoogroups.com, "Joe Ulowetz" joe.ulowetz@> wrote:

> >

> > Hi,

> >

> > Has anyone written up tips on adjusting/tuning a mount with the Ovision worm? I've had mine about 6 months and it was working great, but now I'm getting sudden jumps of several arc-seconds, which might be related to the warmer weather now. I plan to work on it this weekend, so I'm looking for any pointers beyond the instructions that come from Ovision. It's been a year since I last dismantled and cleaned my G-11, so maybe it's time to do this again?

> >

> > Thanks,

> > -Joe

> >

>







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

#42175 Mar 20, 2009

Hi,

The feeler gauge goes between the worm block and the mount body. Not talking about the flat where the bolts go through, but behind the block there is a space. You place the gauge there before you tighten the bolt on each side. I use two feeler gauge sets, one on each side. Then try to find an equal distance, like .03x" of so that will fit on both sides and give me the play I want at the end of the weight shaft.

Floyd

--- In Losmandy_users@yahoogroups.com, "Tom Picciani" tpicciani@...> wrote:

>

> Floyd,

>

> Where are you using a feeler gauge? I don't have my worm yet so I don't have an idea of what you're measuring or how you're doing it.

>

> Can you elaborate?

>

> Thanks.

>

>

>

> --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> >

> > Hi Joe,

> > Well, I can tell you that as it warms up, the worm gets tighter and that could cause the jumps you describe.

> >

> > In my write-up on the MC Mod, I did not get into the adjustment of the worm, mainly because that had be discussed here as I recall.

> > I can tell you that you want to adjust it warm because that will be the tight lash. I use about 1mm movement at the end of the weight shaft warm or 2mm when cold for a lash measurement, which is what OVision recommends.

> >

> > There is only a little adjustment available on the Oldham coupler side, so I do try to get the gap between the two ends of the block and the mount to be as close to equal as possible and still get the play at the end of the shaft that I want. I measure this with feeler gauges.

> >

> > Another thing to look at is possible contamination of the grease on the worm and wheel. If just a bit of grit gets in there, there will be a jump when you hit the grit. You might want to clean off the old grease and apply new grease just to be sure. Then go ahead and adjust the worm again when it is warm, room temperature. Be aware that if you adjusted it at say 70f and the mount gets to 100f it will be tight. But for most of us the temperature at night when we are actually using the mount will be at or below the 70f, except during the summer here in the desert that is! :^) But if you have 1mm of lash then it should still be OK at a higher temp as I only see about 1mm change between quite cold and warm temperatures.

> >

> > Every place is different, so these measurements are just a suggestion and your area may require a slightly different setup.

> > Floyd

> >

> > --- In Losmandy_users@yahoogroups.com, "Joe Ulowetz" joe.ulowetz@> wrote:

> > >

> > > Hi,

> > >

> > > Has anyone written up tips on adjusting/tuning a mount with the Ovision worm? I've had mine about 6 months and it was working great, but now I'm getting sudden jumps of several arc-seconds, which might be related to the warmer weather now. I plan to work on it this weekend, so I'm looking for any pointers beyond the instructions that come from Ovision. It's been a year since I last dismantled and cleaned my G-11, so maybe it's time to do this again?

> > >

> > > Thanks,

> > > -Joe

> > >

> >

>



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

#42176 Mar 20, 2009

Hi,



Another place to look is the gearbox./ Oldham coupler connection - are the grub screws tight?. I had a Dec tracking problem the other night and just found that the grub screws had worked loose, so there was a lot of slop connection of gearbox to coupler.



Cheers

Rod









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

From: Floyd Blue fblue@...>

To: Losmandy_users@yahoogroups.com

Sent: Saturday, 21 March, 2009 6:42:09 AM

Subject: [Losmandy_users] Re: Ovision worm adjustments





Hi Joe,

Well, I can tell you that as it warms up, the worm gets tighter and that could cause the jumps you describe.



In my write-up on the MC Mod, I did not get into the adjustment of the worm, mainly because that had be discussed here as I recall.

I can tell you that you want to adjust it warm because that will be the tight lash. I use about 1mm movement at the end of the weight shaft warm or 2mm when cold for a lash measurement, which is what OVision recommends.



There is only a little adjustment available on the Oldham coupler side, so I do try to get the gap between the two ends of the block and the mount to be as close to equal as possible and still get the play at the end of the shaft that I want. I measure this with feeler gauges.



Another thing to look at is possible contamination of the grease on the worm and wheel. If just a bit of grit gets in there, there will be a jump when you hit the grit. You might want to clean off the old grease and apply new grease just to be sure. Then go ahead and adjust the worm again when it is warm, room temperature. Be aware that if you adjusted it at say 70f and the mount gets to 100f it will be tight. But for most of us the temperature at night when we are actually using the mount will be at or below the 70f, except during the summer here in the desert that is! :^) But if you have 1mm of lash then it should still be OK at a higher temp as I only see about 1mm change between quite cold and warm temperatures.



Every place is different, so these measurements are just a suggestion and your area may require a slightly different setup.

Floyd

--- In Losmandy_users@ yahoogroups. com, "Joe Ulowetz" joe.ulowetz@ ...> wrote:

>

> Hi,

>

> Has anyone written up tips on adjusting/tuning a mount with the Ovision worm? I've had mine about 6 months and it was working great, but now I'm getting sudden jumps of several arc-seconds, which might be related to the warmer weather now. I plan to work on it this weekend, so I'm looking for any pointers beyond the instructions that come from Ovision. It's been a year since I last dismantled and cleaned my G-11, so maybe it's time to do this again?

>

> Thanks,

> -Joe

>











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

#42177 Mar 20, 2009

I think I see what you're talking about; The space between the worm gear cover, which is flat on either side of the worm, and the worm blocks themselves. Correct?







--- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@...> wrote:

>

> Hi,

> The feeler gauge goes between the worm block and the mount body. Not talking about the flat where the bolts go through, but behind the block there is a space. You place the gauge there before you tighten the bolt on each side. I use two feeler gauge sets, one on each side. Then try to find an equal distance, like .03x" of so that will fit on both sides and give me the play I want at the end of the weight shaft.

> Floyd

>

> --- In Losmandy_users@yahoogroups.com, "Tom Picciani" tpicciani@> wrote:

> >

> > Floyd,

> >

> > Where are you using a feeler gauge? I don't have my worm yet so I don't have an idea of what you're measuring or how you're doing it.

> >

> > Can you elaborate?

> >

> > Thanks.

> >

> >

> >

> > --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> > >

> > > Hi Joe,

> > > Well, I can tell you that as it warms up, the worm gets tighter and that could cause the jumps you describe.

> > >

> > > In my write-up on the MC Mod, I did not get into the adjustment of the worm, mainly because that had be discussed here as I recall.

> > > I can tell you that you want to adjust it warm because that will be the tight lash. I use about 1mm movement at the end of the weight shaft warm or 2mm when cold for a lash measurement, which is what OVision recommends.

> > >

> > > There is only a little adjustment available on the Oldham coupler side, so I do try to get the gap between the two ends of the block and the mount to be as close to equal as possible and still get the play at the end of the shaft that I want. I measure this with feeler gauges.

> > >

> > > Another thing to look at is possible contamination of the grease on the worm and wheel. If just a bit of grit gets in there, there will be a jump when you hit the grit. You might want to clean off the old grease and apply new grease just to be sure. Then go ahead and adjust the worm again when it is warm, room temperature. Be aware that if you adjusted it at say 70f and the mount gets to 100f it will be tight. But for most of us the temperature at night when we are actually using the mount will be at or below the 70f, except during the summer here in the desert that is! :^) But if you have 1mm of lash then it should still be OK at a higher temp as I only see about 1mm change between quite cold and warm temperatures.

> > >

> > > Every place is different, so these measurements are just a suggestion and your area may require a slightly different setup.

> > > Floyd

> > >

> > > --- In Losmandy_users@yahoogroups.com, "Joe Ulowetz" joe.ulowetz@> wrote:

> > > >

> > > > Hi,

> > > >

> > > > Has anyone written up tips on adjusting/tuning a mount with the Ovision worm? I've had mine about 6 months and it was working great, but now I'm getting sudden jumps of several arc-seconds, which might be related to the warmer weather now. I plan to work on it this weekend, so I'm looking for any pointers beyond the instructions that come from Ovision. It's been a year since I last dismantled and cleaned my G-11, so maybe it's time to do this again?

> > > >

> > > > Thanks,

> > > > -Joe

> > > >

> > >

> >

>



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