VintageBigBlue.org

 

Re: [Losmandy_users] Re: please guys!!


Dec 10, 2004

 


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

#23378 Dec 10, 2004

Really guys!.



I am expecting my Gemini system to arrive any day now,

and to me, this is a major investment. I hope i did

the right thing.

There has been a lot of talk about fried motors and

bolwn fuses on this group lately, and i am getting a

little worried here. Of course, you would normally not

post here if you had no problems or no issue to

adress, so hopefully there is a silent majority out

here with no problems.

PLEASE GUYS, speak up and tell me that i did the rigth

thing!!!!



regards

Per Jorgensen/Denmark



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

#23379 Dec 10, 2004

In my opinion, Gemini and G11 work, and work fine together.



This system is reasonably complex, and often requires some learning

and some adjustments to become stable and fully functional. It may

not be fully functional out of the box. Scott can probably do well to

offer (even as an option at additional cost) a service to tune the

mount before shipping.



There've been problems reported with Gemini and G11, and many of

these were addressed by newer versions or fixes released by both,

Scott and Rene.



The new (and old) user can take some steps to prevent these problems,

and I don't think that everyone does:



1. Before plugging the mount in for the first time, and each time,

balance it well. Slight imbalance is necessary only in the presence

of backlash, and should be SLIGHT!



2. Check that the mount does not bind in DEC or RA for the full

rotation of the worm and gear: adjust worm to gear spacing to be

loose enough not to provide any resistance. A little backlash is far

more acceptable than burnt-out motors, IMO.



3. Lower slewing speeds to 800x or even 600x -- this is still plenty

fast enough and will be less of a load on the motor. Plus, if

something does bind, you'll have a greater chance of stopping the

mount before anything fails.



4. Use a power supply that's not going to push too much current

through Gemini: 5A at 18v is too much, IMHO. If you're going to use

such a supply, either limit it at 2A if has a limiter, or put a 1.5-

2A fuse in line. I've used my G11/Gemini with 50 lbs of weight, and

slewing all over the sky without blowing a 1.5A fuse at 16v.



5. Check the motor temperature at least once per session. I usually

do this when doing the intial "goto bright star". If a motor is warm

to the touch, don't run the mount and find out what's causing it to

heat up. 9 times out of 10 it will be imbalance, and 7 times out of

10 it'll be worm to gear mesh.



6. Watch for wires getting tangled, and double-check that your safety

limits are set far enough from the tripod to stop before the OTA gets

a chance to hit it.



That's what I've done for the past 4 years. Not to say that I've not

had my share of problems, but these were either fixed by Scott/Rene,

and in most cases were my own fault :)



-Paul



--- In Losmandy_users@yahoogroups.com, per j.rgensen

per_942000@y...> wrote: > Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark



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

#23381 Dec 10, 2004

Hi:



One of the most important things you can do is put a fuse into the

system to prevent the kinds of issues discussed here. You might get

a system with no problems, but preparation is a good thing!



regards

Greg N





--- In Losmandy_users@yahoogroups.com, per j.rgensen

per_942000@y...> wrote: > Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> regards

> Per Jorgensen/Denmark



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

#23383 Dec 10, 2004

Well--as a recent "victim" of a fried Gemini board (going in for repairs today), I still am a big propoenent of the Gemini system. In the 1 1/2 years that I've been using regularly, this is the first problem I've had with my G11/Gemini combo. It's been a great performer. Pointing accuracy truly near/less than 1 arc-sec in pointing (with a good model), and a great set of features built in are really a good bargain for the price.



There are flaws, but Scott/Rene really stand by their product, and do an excellent job of taking care of the issues as they come along.



Take care,

Bob



-------------- Original message --------------

>

> Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark

>

>

>

>

> Yahoo! Groups Links

>

>

>

>

>

>

>



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







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

#23386 Dec 10, 2004

Per,

Yes, you did the right thing. Look at my post yesterday the ninth. I stated most all of the problems that I had with the Gemini Level 1 later Level 3. Besides the waiting times and postage and insurance, Scott Losmandy and associates fixed all the problems that I encountered. Also, Scott answers his phone at Hollywood General Machinery. He offers suggestions and when an issue could not be corrected with conversation he had me send back the Gemini system. I had a lot of problems at different times and he fixed each with courtesy. I would be afraid to purchase any other system.

Matt Johnson

West Hartford, CT







-----Original Message-----

From: per j.rgensen per_942000@...>

Sent: Dec 10, 2004 8:41 AM

To: Losmandy_users@yahoogroups.com

Subject: [Losmandy_users] please guys!!





Really guys!.



I am expecting my Gemini system to arrive any day now,

and to me, this is a major investment. I hope i did

the right thing.

There has been a lot of talk about fried motors and

bolwn fuses on this group lately, and i am getting a

little worried here. Of course, you would normally not

post here if you had no problems or no issue to

adress, so hopefully there is a silent majority out

here with no problems.

PLEASE GUYS, speak up and tell me that i did the rigth

thing!!!!



regards

Per Jorgensen/Denmark









Yahoo! Groups Links



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

#23387 Dec 10, 2004

Hey Per,



--- per j.rgensen per_942000@...> wrote: > PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!



You did. I love mine and have had no problems, once I got used to it. I

did have to replace the 2032 very shortly after getting the system, so

be prepared for that. Just because it's a new mount doesn't mean that

that particular battery is going to be good for a year.



Alan







=====

SCT Astrophotography: www.pbase.com/avoetsch/astrophotography

FS-102 G-11/Gemini: www.pbase.com/avoetsch12952/tak_fs102

& www.pbase.com/avoetsch12952/fs102







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

Do you Yahoo!?

Take Yahoo! Mail with you! Get it on your mobile phone.

mobile.yahoo.com/maildemo



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

#23388 Dec 10, 2004

Hi,

Just make sure about any potential worm/worm gear binding problems,

and you will be fine. I know two guys in our club who have now gone

over 2 years apiece with ZERO motor problems, because they checked

and adjusted theirs as soon as they got them. My two fried servos

were completely my own fault, for not realizing the symptoms quickly

enough. I had NO motor stalls at the 500-700 speed slewing I was

using, but DID have stalls at 900 up periodically. So, I thought

this was "normal" from what I had read here and been told by others

off group from another Internet source. My advice to you is be

absolutely sure you have no gear binding at all at ANY speed...then

you will be safe from frying a servo. Also, it would behoove you

when you first set it up, to feel the motors with your hand to see

if they are heating up conspiculously while you slew the mount. If

they are, the gear mesh is too tight and you will definitely have

problems down the road with your servos if this is not corrected.



Also, be meticulous about balancing the mount properly, particularly

with the heavier payloads (11 inch tubes, etc..), and this will keep

the motors from being overtaxed and giving up prematurely.



One other tip I would offer from learning it the hard way..Call

Scott at Losmandy and get a spare rebuilt servo to keep on hand just

in case. They are money well-spent at only $80 apiece, and often

perform better than the new ones!



There are some things with the Losmandy that I consider top-notch,

and would not trade for anything...the servos are very easy to

replace yourself, the gear mesh is very easy to adjust yourself,

with the aid of automotive feeler gauges (see the .pdf file on this

site), and you cannot beat Scott for good service if something does

go wrong.



Clear skies,

Wade



//////////////////////////////////////////////////////////////////









--- In Losmandy_users@yahoogroups.com, per j.rgensen

per_942000@y...> wrote: > Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark



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

#23391 Dec 10, 2004

Paul-



A really smart system would sense the current drawn by the

servos and automatically slow the slew rate down if the current

is too high. It might also flash a warning of excess current

draw.



Jim Benet







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

#23392 Dec 10, 2004

Jim,



Absolutely. I'm certainly not saying Gemini is perfect. It has the

logic to stall the motor under excessive load, but there are

obviously some cases when it doesn't. When my OTA ran into the pier,

for some reason Gemini didn't stall the motor. The motor started

warming up, and soon blew the fuse (I was really happy I had that

fuse in the circuit :)



I do believe that users that use the 5A+ or unregulated power

supplies are more likely to experience motor burn outs. I find that

1.5A at 16V is sufficient for my mount, even with a heavy load.



Maybe Rene can work out a better servo protection logic in a future

release, but for now, following the simple steps that I outlined

should help protect the motors from a rapid destruction.



Regards,



-Paul





--- In Losmandy_users@yahoogroups.com, "Jim Benet" jimbenet@p...>

wrote: > Paul-

>

> A really smart system would sense the current drawn by the

> servos and automatically slow the slew rate down if the current

> is too high. It might also flash a warning of excess current

> draw.

>

> Jim Benet



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

#23393 Dec 10, 2004

Jorgensen

Equipment forums can appear to amplify the "issues" with a product due to

their very nature as you suggested. It is great to have a venue like this for

feedback and advice, but keep in mind that there are also literally thousands of

happy customers who have not experienced problems as well.

I have had my G-11 with Gemini for 18 months now with no motor burnouts, good

performance and many, many hours of imaging to it's credit.

I am quite certain that the odds are very much in your favor that you will be

delighted with your purchase. Their are also a small percentage of

individuals who have spent much more for some very well reputed mounts (APs, Taks) that

still experience some challenges.



Congratulations on your new mount, and expect (as I was) to be impressed with

the fit and finish when you unpack it.



Charlie

www.astrofx.com

l





In a message dated 12/10/2004 11:50:18 AM Eastern Standard Time,

per_942000@... writes:

Really guys!.



I am expecting my Gemini system to arrive any day now,

and to me, this is a major investment. I hope i did

the right thing.

There has been a lot of talk about fried motors and

bolwn fuses on this group lately, and i am getting a

little worried here. Of course, you would normally not

post here if you had no problems or no issue to

adress, so hopefully there is a silent majority out

here with no problems.

PLEASE GUYS, speak up and tell me that i did the rigth

thing!!!!



regards

Per Jorgensen/Denmark





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



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

#23403 Dec 11, 2004

--- In Losmandy_users@yahoogroups.com, "Greg Crawford" gc@n...>

wrote: > I bought my Gemini system in February 2001. I've never had a motor

burnout or > anything "fried."



I got my G11 this past March. I had a couple of frustrating nights

in the begining because I am one of those guy who says "I don't need

no crummy map" and then I get hopelessly lost. After reading my

instruction & the postings on this group I have had no problems with

my G11, in fact I have not even had to make any adjustments using it

visualy with 29 lb.'s of scope on it.

I have had a couple of stalls due to improper balance. I slew at

600 simply because I don't feel a need to slew faster. Also after

reading about all of the hot motors, one evening in my garage I

slewed at 800 for 5min,'s to see if my motors would get hot, never

happened , they stayed cool. I was using a 12V agm Battery and not

my Lacy 18V converter.

I believe those who are having motor problems but I want to let

folks know that some of us are not having problems. FWIW. The

Losmandy product is a great value with great service. I have owned

AP mounts & vixen mounts.



Regards,

Jeff Vickers



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

#23404 Dec 11, 2004

--- In Losmandy_users@yahoogroups.com, "jjvickers2000"

jvickers@v...> wrote: >

> --- In Losmandy_users@yahoogroups.com, "Greg Crawford" gc@n...>

> wrote:

> > I bought my Gemini system in February 2001. I've never had a

motor > burnout or

> > anything "fried."

>

> I got my G11 this past March. I had a couple of frustrating nights

> in the begining because I am one of those guy who says "I don't

need > no crummy map" and then I get hopelessly lost. After reading my

> instruction & the postings on this group I have had no problems

with > my G11



I would like to add that my initial frustratins with the G11 was

understanding the use of the Gemini system without ready the

instructions fully. The G11 has been great so far.



Jeff



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

#23405 Dec 11, 2004

Per;



You didn't go wrong. Just be open to tuning your G-11, get the balance

right and gear spacings correct. Although some people receive 'out of the

box' mounts Losmandy mount are not known to be 'out of the box' mounts, you

need to fine tune 'em...joe :)





"May You Go Among The Imperishable Stars"



Joe Mize: jmize@...

StarFields Observatory www.cav-sfo.com

Chiefland, FL 29:24'33.4"N 82:51'37.7"W

Moon Phase: tycho.usno.navy.mil/cgi-bin/phase.gif

----- Original Message -----

From: "per j.rgensen" per_942000@...>

To: Losmandy_users@yahoogroups.com>

Sent: Friday, December 10, 2004 11:41 AM

Subject: [Losmandy_users] please guys!!





>

> Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark

>

>

>

>

> Yahoo! Groups Links

>

>

>

>

>

>

>

>







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

#23416 Dec 11, 2004

Thanks a lot guys.

Your knowledgeable answers have saved my night's sleep

and made me feel fine about deciding on upgrading my

G11.

One of the reasons i bought a G11 in the first place

was this user group. A huge database free of charge!!.

I allready joined the Gemini users group, and i will

not hesitate to take advantage!!

Thanks!!



Per Jorgensen













--- joe jmize@...> skrev:



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

Per;



You didn't go wrong. Just be open to tuning your

G-11, get the balance

right and gear spacings correct. Although some people

receive 'out of the

box' mounts Losmandy mount are not known to be 'out of

the box' mounts, you

need to fine tune 'em...joe :)





"May You Go Among The Imperishable Stars"



Joe Mize: jmize@...

StarFields Observatory www.cav-sfo.com

Chiefland, FL 29:24'33.4"N 82:51'37.7"W

Moon Phase:

tycho.usno.navy.mil/cgi-bin/phase.gif

----- Original Message -----

From: "per j.rgensen" per_942000@...>

To: Losmandy_users@yahoogroups.com>

Sent: Friday, December 10, 2004 11:41 AM

Subject: [Losmandy_users] please guys!!





>

> Really guys!.

>

> I am expecting my Gemini system to arrive any day

now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally

not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the

rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark

>

>

>

>

> Yahoo! Groups Links

>

>

>

>

>

>

>

>







Yahoo! Groups Sponsor ADVERTISEMENT





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

Yahoo! Groups Links



To visit your group on the web, go to:

groups.yahoo.com/group/Losmandy_users/



To unsubscribe from this group, send an email to:

Losmandy_users-unsubscribe@yahoogroups.com



Your use of Yahoo! Groups is subject to the Yahoo!

Terms of Service.



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

#23417 Dec 11, 2004

--- In Losmandy_users@yahoogroups.com, per j.rgensen

per_942000@y...> wrote: > Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark





Per,

I have been using G11/Gemini for just over a year now and I am

delighted with it. The only time a motor ran warm was when I mucked

about with the gear mesh. Take my advice, just use the mount and

don't muck about with it.



Dennis



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

#23424 Dec 12, 2004

Per:

You did right, I have been using my Gemini since they came out many

years ago. I have fried 2 R.A servos during that time, so I got

replacements and now have 2 spares. The last time that the R.A. servo

fried was about a year ago, but I think I have solved my personal

problem using a moistened cloth wrapped around the servo case, it has

worked wonders for me. Lately I found out in the threads of this

group, that the frying was caused aside of not having enough gear

clearance which is logical but was not my case, also a matter of heat

conduction in the servomotor and lack of its radiation, so that

explained me my low tech. approach during the last year, but also

explained my success in avoiding burning again the servo.

As for the Gemini system, I can tell you that it is superior than my

personal A-P 1200 Goto and my LX-200GPS, the Gemini moves my old

Losmandy HG-200 mount with incredible goto accuracy and has a superb

tracking ability, every time that I use the scopes mounted on the

Gemini HGM-200( that is a 6" f/12 A-P triplet refractor, a 76mm

TeleVue, a 4" f/9 Coronagraph, a 2.4 Polarex,a piggyback camera and 2

finders), the goto is always on the exact spot, even if I have not

used the system for months, it goes to eitherside of the Meridian

with no problem and keeps the exact object, I still have not been

able to get this accuracy with my other two mounts but I will keep

trying.

Also the 5 button handpad is very simple to use once you get the

feeling and understand the German simplicity approach. I get more

confused with the other 2 handpads (specially with the AutoStar from

the LX-200 GPS), but not with this one because it is very logical.

My 2 cents on the subject.

Regards,

Eric. (M.xico)







--- In Losmandy_users@yahoogroups.com, per j.rgensen

per_942000@y...> wrote: > Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark







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

#23427 Dec 12, 2004

Eric,



What a nice testimonial to the work that Scott and Rene have done. It is

not like this system was developed in a Lab somewhere by a large corporation

with a big budget. Good choices appear to have been made and problems

cannot be avoided in all cases. Scott surely seems willing to address the

problems that are brought to his attention.



Hope Santa leaves a retrofit Gemini system under my tree.



Cheers, Marty



----- Original Message -----

From: "Eric Roel" eroel@...>

To: Losmandy_users@yahoogroups.com>

Sent: Sunday, December 12, 2004 12:14 PM

Subject: [Losmandy_users] Re: please guys!!









Per:

You did right, I have been using my Gemini since they came out many

years ago. I have fried 2 R.A servos during that time, so I got

replacements and now have 2 spares. The last time that the R.A. servo

fried was about a year ago, but I think I have solved my personal

problem using a moistened cloth wrapped around the servo case, it has

worked wonders for me. Lately I found out in the threads of this

group, that the frying was caused aside of not having enough gear

clearance which is logical but was not my case, also a matter of heat

conduction in the servomotor and lack of its radiation, so that

explained me my low tech. approach during the last year, but also

explained my success in avoiding burning again the servo.

As for the Gemini system, I can tell you that it is superior than my

personal A-P 1200 Goto and my LX-200GPS, the Gemini moves my old

Losmandy HG-200 mount with incredible goto accuracy and has a superb

tracking ability, every time that I use the scopes mounted on the

Gemini HGM-200( that is a 6" f/12 A-P triplet refractor, a 76mm

TeleVue, a 4" f/9 Coronagraph, a 2.4 Polarex,a piggyback camera and 2

finders), the goto is always on the exact spot, even if I have not

used the system for months, it goes to eitherside of the Meridian

with no problem and keeps the exact object, I still have not been

able to get this accuracy with my other two mounts but I will keep

trying.

Also the 5 button handpad is very simple to use once you get the

feeling and understand the German simplicity approach. I get more

confused with the other 2 handpads (specially with the AutoStar from

the LX-200 GPS), but not with this one because it is very logical.

My 2 cents on the subject.

Regards,

Eric. (M.xico)







--- In Losmandy_users@yahoogroups.com, per j.rgensen

per_942000@y...> wrote:

> Really guys!.

>

> I am expecting my Gemini system to arrive any day now,

> and to me, this is a major investment. I hope i did

> the right thing.

> There has been a lot of talk about fried motors and

> bolwn fuses on this group lately, and i am getting a

> little worried here. Of course, you would normally not

> post here if you had no problems or no issue to

> adress, so hopefully there is a silent majority out

> here with no problems.

> PLEASE GUYS, speak up and tell me that i did the rigth

> thing!!!!

>

> regards

> Per Jorgensen/Denmark















Yahoo! Groups Links



Contact Us
This Site's Privacy Policy
Google's privacy policies

S
e
n
i
o
r
T
u
b
e
.
o
r
g