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Equipment Discussions >> Mounts

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Cotts
Just Wondering
*****

Reged: 10/10/05

Loc: Toronto, Ontario
Losmandy Counterweight on AP mount. Sacrilege?
      #5471214 - 10/15/12 10:18 AM

My mach 1 GTO currently holds a 1988 6" f/8 refractor. It takes three of the 9 pound counterweights to balance this. (two of the weights are at the end of the travel and one could be slid out about two more inches) I'd like to add my 80mm William Optics as a guide/finder. With rings etc. it is close to another 10 pounds.

Another 9 pound AP weight may not be enough. But a Losmandy 11 pounder might be enough and a Losmandy 21 pound would be excessive, allowing me to remove a couple of the 9#'s.

The AP shaft diameter is 1.125" while the Losmandy shafts are 1.250" so the Losmandy weight could fit. With the locking bolt the Losmandy C. W. won't flop around. Or will it?

Musings over Monday morning coffee.

Especially the 'sacrilege' bit......

Dave


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orlyandico
Postmaster
*****

Reged: 08/10/09

Loc: Singapore
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5471255 - 10/15/12 10:44 AM

You could put the Losmandy weight on top, supported by one AP weight...

incidentally i always wondered if the Losmandy and AP weights were interchangeable. You just answered my question.


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skybsd
Post Laureate
*****

Reged: 02/01/08

Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5471377 - 10/15/12 11:48 AM

Hi,
"Sacrilege" would be a matter for the owner more than anything else..,

One thing to consider is the fact that temperature variations may well contribute to the Losmandy counterweight flopping (even if slightly) as the tighning loosens over time..,

Regards,

skybsd


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Cow Jazz
professor emeritus


Reged: 11/24/03

Loc: Toronto, Ontario
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: skybsd]
      #5471398 - 10/15/12 11:57 AM

Could you add a sleeve to the Los CW? That may solve all issues.

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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5471481 - 10/15/12 12:40 PM

If the counterweight is tightened down, it will be fine, end of story. Sacrilege? I'll tell you what has served me well in this sort of conundrum in the past, Bubba...

"All Cats are Black in the Dark."

Edited by rmollise (10/15/12 01:03 PM)


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bobhen
professor emeritus


Reged: 06/25/05

Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5471491 - 10/15/12 12:43 PM

Quote:

My mach 1 GTO currently holds a 1988 6" f/8 refractor. It takes three of the 9 pound counterweights to balance this. (two of the weights are at the end of the travel and one could be slid out about two more inches) I'd like to add my 80mm William Optics as a guide/finder. With rings etc. it is close to another 10 pounds.

Another 9 pound AP weight may not be enough. But a Losmandy 11 pounder might be enough and a Losmandy 21 pound would be excessive, allowing me to remove a couple of the 9#'s.

The AP shaft diameter is 1.125" while the Losmandy shafts are 1.250" so the Losmandy weight could fit. With the locking bolt the Losmandy C. W. won't flop around. Or will it?

Musings over Monday morning coffee.

Especially the 'sacrilege' bit......

Dave






Ive been using a 21-pound Losmandy weight and a 9-pound AP weight for My C11 and AP155 OTAs works fine (less weights to employ) and no flopping around. The Mach 1 has the standard shaft.

Bob


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skybsd
Post Laureate
*****

Reged: 02/01/08

Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cow Jazz]
      #5471537 - 10/15/12 01:04 PM

Quote:

Could you add a sleeve to the Los CW? That may solve all issues.




I imagine it should work - though what material to use + effectiveness may well vary with local conditions..,

Best..,

skybsd


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Cotts
Just Wondering
*****

Reged: 10/10/05

Loc: Toronto, Ontario
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: skybsd]
      #5471637 - 10/15/12 01:58 PM

Thanks, folks for the timely replies. It seems buying one 21# Lsmandy will do the trick. Apparently no sleeve will be needed. As far as interchangeability, the Losmandys will fit on the AP but not vice versa....

Dave


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RAKing
Postmaster
*****

Reged: 12/28/07

Loc: West of the D.C. Nebula
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5472828 - 10/16/12 07:34 AM

Dave,

I get my counterweights from Robin Casady and they all look the same.

Try it - no one will know!

Cheers,

Ron


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Cotts
Just Wondering
*****

Reged: 10/10/05

Loc: Toronto, Ontario
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: RAKing]
      #5472943 - 10/16/12 09:37 AM

I just went to the Casady website and his counterweights are for the 1.875" shaft so I won't be able to use them...

Thanks for the tip, nevertheless. He shows many other interesting products...

Dave


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EFT
Vendor - Deep Space Products
*****

Reged: 05/07/07

Loc: Phoenix, AZ
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5473100 - 10/16/12 11:11 AM

The problem with mounting a counterwieght with a larger diameter is that it will throw off the DEC balance to some extent since the counterwieght is not centered on the shaft. Some counterwieghts are already off balanced due to the knob and if that is the case with the Losmandy counterwieght, then it will be excentuated by pushing the knob side of the counterwieght further from the shaft.

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RAKing
Postmaster
*****

Reged: 12/28/07

Loc: West of the D.C. Nebula
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5473169 - 10/16/12 11:51 AM

Quote:

I just went to the Casady website and his counterweights are for the 1.875" shaft so I won't be able to use them...

Thanks for the tip, nevertheless. He shows many other interesting products...

Dave




Actually, I was suggesting one of his Losmandy counterweights. The 15 pounder might be a perfect compromise. You could sandwich it between two A-P nine pounders and no one would notice.

Sorry for the confusion,

Ron


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jmiele
Patron Saint?
*****

Reged: 12/04/10

Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5473555 - 10/16/12 04:35 PM

Quote:

I just went to the Casady website and his counterweights are for the 1.875" shaft so I won't be able to use them...

Thanks for the tip, nevertheless. He shows many other interesting products...

Dave




Dave, I think A-P sells a standard 1.875" A-P 900/1220 bar for the Mach1GTO.

Best, Joe


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orlyandico
Postmaster
*****

Reged: 08/10/09

Loc: Singapore
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: jmiele]
      #5474391 - 10/17/12 02:05 AM

Yes they do..

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andysea
Pooh-Bah
*****

Reged: 09/03/10

Loc: Seattle, WA
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: orlyandico]
      #5479441 - 10/19/12 08:21 PM

I must have committed the ultimate sacrilege. I sandwich two 10lb gym plates between my two Tak weights on my NJP!.....Am I going to astronomy hell?

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Dan Finnerty
sage


Reged: 09/11/11

Loc: Pasadena, CA
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: andysea]
      #5484593 - 10/23/12 12:36 AM

Quote:

I must have committed the ultimate sacrilege. I sandwich two 10lb gym plates between my two Tak weights on my NJP!.....Am I going to astronomy hell?




You practice astrophotography in the dark with barbell weights. Indeed, you are already there!


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andysea
Pooh-Bah
*****

Reged: 09/03/10

Loc: Seattle, WA
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Dan Finnerty]
      #5484691 - 10/23/12 01:31 AM

Oh dear!! you might be right Dan:) It's just that at close to $400 a pop those Tak weight aren't cheap....and they rust!
On a different note I am going to try a Meade LX80 weight on the Mach1. I should have the weight by the end of the week. I will report back and let everyone know if it fits.


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andysea
Pooh-Bah
*****

Reged: 09/03/10

Loc: Seattle, WA
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Cotts]
      #5489242 - 10/25/12 08:34 PM

I can confirm that the Meade LX-80 counterweights will fit nicely on the Mach1 standard counterweight shaft. They are 11lbs each and they are probably the cheapest counterweights available on the market. They are also painted a nice silver finish.

Andy


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Starhawk
Space Ranger
*****

Reged: 09/16/08

Loc: Tucson, Arizona
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: andysea]
      #5489989 - 10/26/12 10:50 AM

The only point I'd look out for is if the alternate weights are going to scar up the counterweight bar. AP weights have bronze bushings and noses on their set screws.

The 1.25" diameter of a Losmandy weight would leave room for a bushing.

What would be really cool is a 40 amp-hour 12V battery weight.

-Rich


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andysea
Pooh-Bah
*****

Reged: 09/03/10

Loc: Seattle, WA
Re: Losmandy Counterweight on AP mount. Sacrilege? new [Re: Starhawk]
      #5490544 - 10/26/12 04:57 PM

Good point RIch!
I bought a 12" bronze rod of the right diameter to replace the Meade steel plugs that press against the counterweight shaft. I will cut the rod in pieces of the correct length, one per each counterweight. It came up to a whopping 5 dollars


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