Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Thanks so much for the parts references, David. Nice to have all this stated in one place.
Regards,
John
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Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Robert, the Belleville washer is used to keep the worm bearing race centered and eliminate a massive 76 second periodic error I had that could not be guided out.
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Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Well since you brought it up¡ the Titan wasn¡¯t quite the biggest mount. That would be its predecessor, the HGM200, which weighs 9 lb more and has a rated 150 lb capacity, vs 100 lb for the Titan. It was replaced by the Titan in 2002. ?No idea how many were made, but they don¡¯t show up on the used market very often, so either production was limited, they are really great mounts that no one ever wants to sell, or they are crap that has mostly been scrapped. Probably a combination of the first two.?
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On Aug 7, 2021, at 12:33 PM, Michael Herman <mherman346@...> wrote:
? Isn't it fun that every day is another IQ test?!? My "dictionary" would include these ...I'm sure there are more I left out...
Losmandy terms and abbreviations:
SLW is the Spring Loaded Worm?
G11 is the G11 mount (mean for up to 11 inch SCT) having 1.25 inch shafts. This mount has undergone many design variants during the production.?
CG11 is the original Celestron G11 mount, it was packaged with the Celestron C11 telescope
GM8 is the lighter duty mount made for up to 8 inch SCTs. It has 1.25 inch shafts
Titan was the biggest mount Losmandy made, having 2 inch diameter shafts.? Made for very large heavy telescopes.? The full Titan with 2 inch RA and DEC axes is no longer in production.??
G11T is a hybrid mount with a Titan (2 inch shaft) RA axis and a G11 (1.25 inch shaft) DEC axis
GM811 is a hybrid mount with a G11 RA and a GM8 DEC axis.??
OPW is a "one piece worm" assembly.? It consists of a metal L bracket to hold the two worm blocks (one at each end) in alignment.??
Gemini is a computer controller for GoTo operation using it's Servo Motors.? It can run any Losmandy mount or many other mounts, and permits custom settings.
G1 or G-1 means the first version of the Gemini computer controller.? It uses a serial port interface (easily connects to a serial-to- USB device) to connect to a computer for remote GoTo operation.
G2 or G-2 is the smaller and newer Gemini-2?computer controller. It has a serial port and USB port and added a CAT5 internet type of serial interface for remote computer operation.??
Auto-Guiding aka "guiding":
PHD2 is a free yet sophisticated PC computer program that rapidly analyses star images on a video camera, then issues movement commands to the mount to keep the stars in that image in place.??
OAG is an Off Axis Guider that permits autoguiding from the same primary telescope view as the main imaging camera.? This is important to eliminate effects of imperfect polar axis alignment. The alternative to OAG is Piggyback guiding using a second telescope strapped or bolted to the primary imaging telescope.
Telescopes:
SCT is a Schmidt-Cassegrain Telescope design
RC means a Ritchey-Cretien telescope design.? This is very similar to an SCT but has some advantages to reduce coma in an SCT.??
Petzval is a design of refractor using two doublet lens groups to focus all colors to the same pinpoint spot.? An alternative is a triplet telescope using 3 lens elements in one group.
FL is focal length, which describes the ratio of the focal length (distance from the front lens front surface to the rear image plane) divided by the diameter of the front lens or telescope aperture.??
"Fast optics" means a short FL focal length.? This means a very wide optical opening (aperture) compared to the image size, so the film can be exposed quickly (hence a fast lens allows for fast imaging).? F4 is generally a "fast" lens but f8 is a generally a "slow" lens.? Most SCTs are f10 or f11.? Some are f6.3, and some are f4.?
.... All the best, Michael On Sat, Aug 7, 2021, 11:14 AM Paul Kanevsky < yh@...> wrote: Hi Robert,
Welcome to the forum! I agree with you, some abbreviations are pretty obscure. SLW stands for spring-loaded worm.
I¡¯ll see if we can start a community-maintained glossary of terms here.
Regards,
? ? -Paul
On Sat, Aug 7, 2021 at 01:57 PM, Robert Hancey wrote:
R. Hancey here, I am somewhat new to this forum (in terms of commenting), and my problem is I see so many abbrevations like SLW, just what blank is it. Is there a glossary of terms available who yet to ;learn the "lingo" that is used when discussing Losmandy mounts, tried Googling the term no luck, any assistance or direction that one can point me as many folks use these terms and I lose understanding of topic that is discussed. Respectfully submitted.
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Re: Relationship between needle bearing wobble and variable worm mesh and backlash
Bob:
Correct. On this era of G11 there is no bearing in the worm wheel.
Keith
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Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
David,
Will adding the Bellville spring washer allow you to insert the bearing blocks into the plate?? Do you have 0.013 clearance?? Is 7 lbs of force enough to overcome any imbalance you might have?
Bob
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On Sat, Aug 7, 2021 at 08:33 AM, David Malanick wrote:
Here are the parts I used for retrofit, including Belleville worm block upgrade.
Qty listed as needed per axis. Belleville washers come int 10 pack, so only 1 needed for both axis.
?????
Qty
2???? 5909K38??? ??? Needle-Roller Thrust Bearing for 1-1/4" Shaft Diameter, 1-15/16" OD
1 ??? 5909K28??? ??? Needle-Roller Thrust Bearing for 3" Shaft Diameter, 3-3/4" OD
? ? ? ?
3? ?? 5905K29??? ??? Needle-Roller Bearing, Open, for 1-1/4" Shaft Diameter
? ?? ?
1??? 94065K32??? Belleville Disc Springs for Ball Bearing Trade No. R4, 0.406" ID, Packs of 10
? ? ?
2?????? SR4-ZZC #7 PS2?? BG (.250X.625X.196)
? ? ?? ?
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Re: Relationship between needle bearing wobble and variable worm mesh and backlash
Keith,
Boy that is some nasty out-of-square shaft you have there.? I also notice you don't have a bearing in the worm wheel?? Does the worm wheel just run on the brass bearing tube?
Michael,
I agree, my worm wheel does the same thing.? Rotate one way and it's fine, and the other way it wants to lift off the brass bearing tube.
Bob
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Re: Relationship between needle bearing wobble and variable worm mesh and backlash
Wow, that shaft is way out of perpendicular. ?I wonder how that happened.
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[Edited Message Follows]
On Sat, Aug 7, 2021 at 01:11 PM, Les Niles wrote:
Your drawing illustrates another potential issue: if the shaft is not exactly perpendicular to the clutch plate, there will be a twisting force when the clutch is tightened. ?This force would be taken up in two places: forcing the shaft to contact the needle bearings at opposite sides as illustrated, and also by slightly tilting the worm wheel on the brass bushing. The former shouldn¡¯t be a problem; those contact points will just rotate around as the shaft turns. But the latter will cause the wheel to ride up and down slightly on the worm as the axis rotates. ?It would be interesting to put a dial gauge on the surface of the wheel to see how much this actually happens. ?
Well here is my N=1 for this exact thing (these photos include before and after Scott re-machined it for me after sending it in, hence the non-anodized surface).? ?? /g/Losmandy_users/photo/54848/5?p=Created,,,20,2,0,0Keith
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Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Excellent start, Michael! Can you please add these to the definitions database I just created? Just add one row per term/abbreviation in first column, and paragraph description in the second: /g/Losmandy_users/table?id=33190Everyone can add more information/definitions to this table. Please keep the description reasonably brief, include links to other pages or messages that have details in them if possible. Regards, ? ? ?-Paul
On Sat, Aug 7, 2021 at 03:33 PM, Michael Herman wrote:
Isn't it fun that every day is another IQ test?!? My "dictionary" would include these ...I'm sure there are more I left out...
?
Losmandy terms and abbreviations:
?
SLW is the Spring Loaded Worm?
?
G11 is the G11 mount (mean for up to 11 inch SCT) having 1.25 inch shafts. This mount has undergone many design variants during the production.?
?
CG11 is the original Celestron G11 mount, it was packaged with the Celestron C11 telescope
?
GM8 is the lighter duty mount made for up to 8 inch SCTs. It has 1.25 inch shafts
?
Titan was the biggest mount Losmandy made, having 2 inch diameter shafts.? Made for very large heavy telescopes.? The full Titan with 2 inch RA and DEC axes is no longer in production.??
?
G11T is a hybrid mount with a Titan (2 inch shaft) RA axis and a G11 (1.25 inch shaft) DEC axis
?
GM811 is a hybrid mount with a G11 RA and a GM8 DEC axis.??
?
OPW is a "one piece worm" assembly.? It consists of a metal L bracket to hold the two worm blocks (one at each end) in alignment.??
?
Gemini is a computer controller for GoTo operation using it's Servo Motors.? It can run any Losmandy mount or many other mounts, and permits custom settings.
?
G1 or G-1 means the first version of the Gemini computer controller.? It uses a serial port interface (easily connects to a serial-to- USB device) to connect to a computer for remote GoTo operation.
?
G2 or G-2 is the smaller and newer Gemini-2?computer controller. It has a serial port and USB port and added a CAT5 internet type of serial interface for remote computer operation.??
?
Auto-Guiding aka "guiding":
?
PHD2 is a free yet sophisticated PC computer program that rapidly analyses star images on a video camera, then issues movement commands to the mount to keep the stars in that image in place.??
?
OAG is an Off Axis Guider that permits autoguiding from the same primary telescope view as the main imaging camera.? This is important to eliminate effects of imperfect polar axis alignment.
The alternative to OAG is Piggyback guiding using a second telescope strapped or bolted to the primary imaging telescope.
?
Telescopes:
?
SCT is a Schmidt-Cassegrain Telescope design
?
RC means a Ritchey-Cretien telescope design.? This is very similar to an SCT but has some advantages to reduce coma in an SCT.??
?
Petzval is a design of refractor using two doublet lens groups to focus all colors to the same pinpoint spot.? An alternative is a triplet telescope using 3 lens elements in one group.
?
FL is focal length, which describes the ratio of the focal length (distance from the front lens front surface to the rear image plane) divided by the diameter of the front lens or telescope aperture.??
?
"Fast optics" means a short FL focal length.? This means a very wide optical opening (aperture) compared to the image size, so the film can be exposed quickly (hence a fast lens allows for fast imaging).? F4 is generally a "fast" lens but f8 is a generally a "slow" lens.? Most SCTs are f10 or f11.? Some are f6.3, and some are f4.?
?
....
All the best,
Michael
On Sat, Aug 7, 2021, 11:14 AM Paul Kanevsky < yh@...> wrote:
Hi Robert,
Welcome to the forum! I agree with you, some abbreviations are pretty obscure. SLW stands for spring-loaded worm.
I¡¯ll see if we can start a community-maintained glossary of terms here.
Regards,
? ? -Paul
On Sat, Aug 7, 2021 at 01:57 PM, Robert Hancey wrote:
R. Hancey here, I am somewhat new to this forum (in terms of commenting), and my problem is I see so many abbrevations like SLW, just what blank is it. Is there a glossary of terms available who yet to ;learn the "lingo" that is used when discussing Losmandy mounts, tried Googling the term no luck, any assistance or direction that one can point me as many folks use these terms and I lose understanding of topic that is discussed. Respectfully submitted.
|
Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Isn't it fun that every day is another IQ test?!? My "dictionary" would include these ...I'm sure there are more I left out...
Losmandy terms and abbreviations:
SLW is the Spring Loaded Worm?
G11 is the G11 mount (mean for up to 11 inch SCT) having 1.25 inch shafts. This mount has undergone many design variants during the production.?
CG11 is the original Celestron G11 mount, it was packaged with the Celestron C11 telescope
GM8 is the lighter duty mount made for up to 8 inch SCTs. It has 1.25 inch shafts
Titan was the biggest mount Losmandy made, having 2 inch diameter shafts.? Made for very large heavy telescopes.? The full Titan with 2 inch RA and DEC axes is no longer in production.??
G11T is a hybrid mount with a Titan (2 inch shaft) RA axis and a G11 (1.25 inch shaft) DEC axis
GM811 is a hybrid mount with a G11 RA and a GM8 DEC axis.??
OPW is a "one piece worm" assembly.? It consists of a metal L bracket to hold the two worm blocks (one at each end) in alignment.??
Gemini is a computer controller for GoTo operation using it's Servo Motors.? It can run any Losmandy mount or many other mounts, and permits custom settings.
G1 or G-1 means the first version of the Gemini computer controller.? It uses a serial port interface (easily connects to a serial-to- USB device) to connect to a computer for remote GoTo operation.
G2 or G-2 is the smaller and newer Gemini-2?computer controller. It has a serial port and USB port and added a CAT5 internet type of serial interface for remote computer operation.??
Auto-Guiding aka "guiding":
PHD2 is a free yet sophisticated PC computer program that rapidly analyses star images on a video camera, then issues movement commands to the mount to keep the stars in that image in place.??
OAG is an Off Axis Guider that permits autoguiding from the same primary telescope view as the main imaging camera.? This is important to eliminate effects of imperfect polar axis alignment. The alternative to OAG is Piggyback guiding using a second telescope strapped or bolted to the primary imaging telescope.
Telescopes:
SCT is a Schmidt-Cassegrain Telescope design
RC means a Ritchey-Cretien telescope design.? This is very similar to an SCT but has some advantages to reduce coma in an SCT.??
Petzval is a design of refractor using two doublet lens groups to focus all colors to the same pinpoint spot.? An alternative is a triplet telescope using 3 lens elements in one group.
FL is focal length, which describes the ratio of the focal length (distance from the front lens front surface to the rear image plane) divided by the diameter of the front lens or telescope aperture.??
"Fast optics" means a short FL focal length.? This means a very wide optical opening (aperture) compared to the image size, so the film can be exposed quickly (hence a fast lens allows for fast imaging).? F4 is generally a "fast" lens but f8 is a generally a "slow" lens.? Most SCTs are f10 or f11.? Some are f6.3, and some are f4.?
.... All the best, Michael
On Sat, Aug 7, 2021, 11:14 AM Paul Kanevsky < yh@...> wrote: Hi Robert,
Welcome to the forum! I agree with you, some abbreviations are pretty obscure. SLW stands for spring-loaded worm.
I¡¯ll see if we can start a community-maintained glossary of terms here.
Regards,
? ? -Paul
On Sat, Aug 7, 2021 at 01:57 PM, Robert Hancey wrote:
R. Hancey here, I am somewhat new to this forum (in terms of commenting), and my problem is I see so many abbrevations like SLW, just what blank is it. Is there a glossary of terms available who yet to ;learn the "lingo" that is used when discussing Losmandy mounts, tried Googling the term no luck, any assistance or direction that one can point me as many folks use these terms and I lose understanding of topic that is discussed. Respectfully submitted.
|
Re: Relationship between needle bearing wobble and variable worm mesh and backlash
Hi Eric,
You raised an interesting question ...could you operate the axis with the shaft removed?
I tried this recently on my GM8. .I was surprised to find the worm would jam in the ring gear with the shaft out.? I realized that the shaft upper part is the only thing that holds the ring gear down on the upper thrust bearing.? If the ring gear shift up slightly, the worm (if rotating upward at the worm wheel teeth) grabs the lower edge of the ring gear thread, and of course jams itself.
I think that if the worm is rotating downward at the worm wheel teeth, it would not jam.? The ring gear can't go lower as it rides on top of the upper thrust bearing...but it can rise up with nothing holding it from above.
Anyway....that was my experience.... trying to run with the shaft out.
Best, Michael
Has anyone checked the worm-gear mesh when the Dec shaft is removed? Are there still tight spots around the axis with the shaft removed? Or is the mesh equal all around the axis?
Eric
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Re: Relationship between needle bearing wobble and variable worm mesh and backlash
On Sat, Aug 7, 2021 at 01:11 PM, Les Niles wrote:
Your drawing illustrates another potential issue: if the shaft is not exactly perpendicular to the clutch plate, there will be a twisting force when the clutch is tightened. ?This force would be taken up in two places: forcing the shaft to contact the needle bearings at opposite sides as illustrated, and also by slightly tilting the worm wheel on the brass bushing. The former shouldn¡¯t be a problem; those contact points will just rotate around as the shaft turns. But the latter will cause the wheel to ride up and down slightly on the worm as the axis rotates. ?It would be interesting to put a dial gauge on the surface of the wheel to see how much this actually happens. ?
Well here is my N=1 for this exact thing (these photos include before and after Scott re-machined it for me after sending it in, hence the non-anodized surface).? ?? /g/Losmandy_users/photo/54848/5?p=Created,,,20,2,0,0Keith
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Re: Relationship between needle bearing wobble and variable worm mesh and backlash
Has anyone checked the worm-gear mesh when the Dec shaft is removed? Are there still tight spots around the axis with the shaft removed? Or is the mesh equal all around the axis?
Eric
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Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Hi Robert,
Welcome to the forum! I agree with you, some abbreviations are pretty obscure. SLW stands for spring-loaded worm.
I¡¯ll see if we can start a community-maintained glossary of terms here. Meanwhile, you can check out this link:
Or search for terms within this forum from the browser.
Regards,
? ? -Paul
On Sat, Aug 7, 2021 at 01:57 PM, Robert Hancey wrote:
R. Hancey here, I am somewhat new to this forum (in terms of commenting), and my problem is I see so many abbrevations like SLW, just what blank is it. Is there a glossary of terms available who yet to ;learn the "lingo" that is used when discussing Losmandy mounts, tried Googling the term no luck, any assistance or direction that one can point me as many folks use these terms and I lose understanding of topic that is discussed. Respectfully submitted.
|
Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
R. Hancey here, I am somewhat new to this forum (in terms of commenting), and my problem is I see so many abbrevations like SLW, just what blank is it. Is there a glossary of terms available who yet to ;learn the "lingo" that is used when discussing Losmandy mounts, tried Googling the term no luck, any assistance or direction that one can point me as many folks use these terms and I lose understanding of topic that is discussed. Respectfully submitted.
|
Re: Relationship between needle bearing wobble and variable worm mesh and backlash
Thanks for the drawing. ?Slop between the brass bushing and the worm wheel bearing will only push the wheel into the worm if the shaft is snug in the needle bearings. I would guess that the design intends the opposite: the worm wheel should be a fairly snug fit on the brass bushing, just loose enough to allow disassembly for cleaning, while the shaft should be somewhat looser in the needle bearings to allow the the long shaft to be removed and replaced. ?
Your drawing illustrates another potential issue: if the shaft is not exactly perpendicular to the clutch plate, there will be a twisting force when the clutch is tightened. ?This force would be taken up in two places: forcing the shaft to contact the needle bearings at opposite sides as illustrated, and also by slightly tilting the worm wheel on the brass bushing. The former shouldn¡¯t be a problem; those contact points will just rotate around as the shaft turns. But the latter will cause the wheel to ride up and down slightly on the worm as the axis rotates. ?It would be interesting to put a dial gauge on the surface of the wheel to see how much this actually happens. ?
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Very Interesting discussion. I just wanted to share what I think is going on more graphically.?
The image shows what I believe to a be a bias force that is locked into the ring gear when the clutch is tightened. This is due to the clutch disc being ever so slightly off center due to slop in the needle bearings and/or space between the brass busing and ring gear bearing, also possibly due to deformation of the clutch disc itself or differential pressure on the thrust bearing . Whatever the source, it produces a force that varies on rotation such that at 180 degrees from the CDW it pushes the into gear into the worm by the greatest amount.
Peter
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Re: Relationship between needle bearing wobble and variable worm mesh and backlash
On Thu, Aug 5, 2021 at 03:24 PM, Robert Benward wrote:
I just went downstairs to play with my RA axis.? The thrust bearings did need a good cleaning, I could feel the difference before and after cleaning.? I think my worm is also stainless, is that possible?? I have my worm spring loaded on to the worm wheel, which seems to help in backlash. I have what I would describe as a periodic friction, as if the worm shaft was not straight.? I will need to take a dial indicator to it and see what is going on.? I'm attaching a picture of the rear most thrust bearing washer.? It has taken a set, probably from me cranking down on the clutch.? I am just flipping it over.? I don't see it on the larger worm wheel thrust bearing, so I am good there.? FYI, that 4.5" thrust bearing is like $50 or so...not including washers.? Yikes!
Bob
Bod, This I think supports my idea that the down force from tightening the clutch is not uniformly applied leading to a side force being applied to the worm that varies upon rotation. Peter
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Re: Relationship between needle bearing wobble and variable worm mesh and backlash
Very Interesting discussion. I just wanted to share what I think is going on more graphically.?
The image shows what I believe to a be a bias force that is locked into the ring gear when the clutch is tightened. This is due to the clutch disc being ever so slightly off center due to slop in the needle bearings and/or space between the brass busing and ring gear bearing, also possibly due to deformation of the clutch disc itself or differential pressure on the thrust bearing . Whatever the source, it produces a force that varies on rotation such that at 180 degrees from the CDW it pushes the into gear into the worm by the greatest amount.
Peter
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Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Here are the parts I used for retrofit, including Belleville worm block upgrade.
Qty listed as needed per axis. Belleville washers come int 10 pack, so only 1 needed for both axis.
?????
Qty
2???? 5909K38??? ??? Needle-Roller Thrust Bearing for 1-1/4" Shaft Diameter, 1-15/16" OD
1 ??? 5909K28??? ??? Needle-Roller Thrust Bearing for 3" Shaft Diameter, 3-3/4" OD
? ? ? ?
3? ?? 5905K29??? ??? Needle-Roller Bearing, Open, for 1-1/4" Shaft Diameter
? ?? ?
1??? 94065K32??? Belleville Disc Springs for Ball Bearing Trade No. R4, 0.406" ID, Packs of 10
? ? ?
2?????? SR4-ZZC #7 PS2?? BG (.250X.625X.196)
? ? ?? ?
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Re: Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
That's interesting, David. Would you please post the parts numbers for all the bearings you used and the source? I'll probably buy these to have on hand for my next rebuild.
Your RA shaft wear looks pretty similar to what I saw when I did my mount last year. Looking at your photo detail, it looks like the needle bearings gave the shaft a "polish" job. I would bet the needle bearings have a smoother surface than the shaft does, and over time they start wearing down the shaft's high spots. The shaft should perhaps be more finely machined to start with to avoid this wear pattern or a break in period.
Putting the wavy washer on the Dec shaft I haven't heard about yet. Since you can tilt this shaft to horizontal easily, the stiction is usually pretty low. Hope this has helped your balancing efforts.
Thanks,
John
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Things noticed with my G11G regarding recent topics including shaft wear, bearings, worms and miscellaneous
Okay so I've got my mount to a pretty good point. I have the SLW and tucked motors. Guiding is between 0.30 and 0.65.
After working on my DEC axis and getting it all straightened out I started on my RA axis.
After tear down and analysis, here are the things I've noticed regarding recent lengthy threads.
There is a little bit of wear on the upper and lower section of my shaft.
On the section to the right there is only a small little area I can feel with my fingernail that's a little uneven.
I went ahead and replaced the two stock bearings with three of the caged bearings.
I was informed by the metal fabricator who removed the old bearings for me that the stock bearings have more needles
so it should be smoother, however the new bearings are caged so they should have less play. Three bearings
should be better than two I hope.
Replacing the ring bearing with the sturdier model. Measured and they are exactly the same
height. Old bearing has smaller but more needle bearings and the new bearings
have longer needle bearings but fewer. Seems to even out contact surface area.
And the new bearings look like they hold a lot more grease in place.
Have the wavy washer on both axis because my scope is a pain to balance.
Noticed when I had the DEC apart the sharp edges of the washer were digging into the disk
and creating little plastic particles. I assume these particles get into the grease
and can cause the random excursions I had in the DEC axis. What I did was
clean everything up as good as I can and sand down the sharp edges
of the wavy washer till they're rounded slightly and smooth. Seem to fix the
DEC axis, I'll see what effect it has on the RA.
When I did the Bellevue washer upgrade, to get rid of my 76 second error, I ordered a pair of
worm blocks for that just in case I screw something up moment. Comparing them to the
current worm blocks found on the SLW, I found the current worm blocks on my mount
were machine down on one side 0.01mm and the spring side block's index peg also machined
smaller. I assume they are machined to fit against the block holder better and allow more
movement for the spring-loaded block. Just a heads up if you order some.
Technically this shouldn't really affect guiding. When I took this apart,
having never been touched by me before, these two screws
weren't even finger tight. Just put the Allen wrench in and they turned
without any effort. Just a heads up. Heard too many of those horror stories
about IOptron mounts coming from the factory with loose nuts and bolts
causing whacked guiding.
That's one of the reasons why I bought a Losmandy mount.
So time to double check everything on my mount.
I've absorbed a lot of great information and ideas from this group.
Just wanted to share any information that might be helpful to people.
Overall happy with my mount now, just trying to get that last 1%.
David Malanick
?
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David Malanick
Paul Kanevsky
Michael Herman