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OnStep Goto Conversion
A few GM8/G11s have been converted to stepper operation by members of?/g/onstep. Stepper drivers, basically current amplifiers, have come a long way since the 492 was developed in the early '90s as have microprocessors. Stepper motors are quite quite when operated at high microstepping rates. Current drives can break each step into 128 movements.? These improvements permit a NEMA 11 stepper (?Frame Size (28 x 28mm)?with a 18;1 gear head to drive a G11. The motor and its gear head tuck neatly under the RA worm housing.? ? |
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Re: Just purchased GM811GHD
开云体育Bryan I agree.? Look at the weight of a slave vs li-fe-po4, though.? An sla gives you a good workout lugging it around! Chuck Sent from my Samsung Galaxy Tab?|PRO -------- Original message -------- From: "bryancashion@... [Losmandy_users]" <Losmandy_users@...> Date: 12/08/2017 12:28 PM (GMT-08:00) To: Losmandy_users@... Subject: RE: [Losmandy_users] Re: Just purchased GM811GHD ? At 0.5 A, a 22 Ah battery would be good for 22 hours on the basis that these types of batteries should not be discharged to more than 50% pf their capacity. 22 Ah*50%/0.5A? = 22 hours
I have had good luck with Power-Sonic SLAs (I have 3).? This is a link to their 12V series. ? Bryan Sent from my Samsung Galaxy Tab?|PRO -------- Original message -------- From: "bvalente@... [Losmandy_users]" <Losmandy_users@...> Date: 12/08/2017 11:33 AM (GMT-08:00) To: Losmandy_users@... Subject: [Losmandy_users] Re: Just purchased GM811GHD ? yes, they will definitely work.? Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? for astro that's not important -? instead we want greater battery capacity, hence amp-hours if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. just FYI B ? |
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Re: Just purchased GM811GHD
开云体育Right – what he said ;) ? Thanks ? Brian ? ? Brian Valente Brianvalentephotography.com ? From: Losmandy_users@... [mailto:Losmandy_users@...]
Sent: Friday, December 8, 2017 12:28 PM To: Losmandy_users@... Subject: RE: [Losmandy_users] Re: Just purchased GM811GHD ? ? At 0.5 A, a 22 Ah battery would be good for 22 hours on the basis that these types of batteries should not be discharged to more than 50% pf their capacity. ? 22 Ah*50%/0.5A? = 22 hours ? I have had good luck with Power-Sonic SLAs (I have 3).? This is a link to their 12V series. ? ? ? Bryan ? ? Sent from my Samsung Galaxy Tab?|PRO
yes, they will definitely work.? ? Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? ? for astro that's not important -? instead we want greater battery capacity, hence amp-hours ? if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long ? ? me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. ? just FYI ? ? B ? |
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Re: Just purchased GM811GHD
At 0.5 A, a 22 Ah battery would be good for 22 hours on the basis that these types of batteries should not be discharged to more than 50% pf their capacity.
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22 Ah*50%/0.5A? = 22 hours I have had good luck with Power-Sonic SLAs (I have 3).? This is a link to their 12V series. ? Bryan Sent from my Samsung Galaxy Tab?|PRO -------- Original message -------- From: "bvalente@... [Losmandy_users]" <Losmandy_users@...> Date: 12/08/2017 11:33 AM (GMT-08:00) To: Losmandy_users@... Subject: [Losmandy_users] Re: Just purchased GM811GHD ? yes, they will definitely work.? Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? for astro that's not important -? instead we want greater battery capacity, hence amp-hours if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. just FYI B ? |
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Re: Just purchased GM811GHD
开云体育On power, you might consider using a lithium iron phosphate battery.? It is tolerant of temp unlike lithium batteries but is not cheap.? But it is lighter and, with purchased battery charger, you can use it at home plugged in.? You just add cig lighter jack and fuse and away you go. https://www.powerstream.com/LLLF-12v.htm Chuck Sent from my Samsung Galaxy Tab?|PRO -------- Original message -------- From: "bvalente@... [Losmandy_users]" <Losmandy_users@...> Date: 12/08/2017 11:33 AM (GMT-08:00) To: Losmandy_users@... Subject: [Losmandy_users] Re: Just purchased GM811GHD ? yes, they will definitely work.? Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? for astro that's not important -? instead we want greater battery capacity, hence amp-hours if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. just FYI B
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Re: Just purchased GM811GHD
Ditto B,
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I use two 55 amp-hr batteries to power? all my imaging equipment each session. John Hobbs
hobbs_john@... -----Original Message----- From: bvalente@... [Losmandy_users] To: Losmandy_users Sent: Fri, Dec 8, 2017 2:33 pm Subject: [Losmandy_users] Re: Just purchased GM811GHD
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yes, they will definitely work.?
Car starter batteries are more designed around offering a maximum amperage to kick over the motor.?
for astro that's not important -? instead we want greater battery capacity, hence amp-hours
if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long
me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more.
just FYI
B
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Re: Just purchased GM811GHD
yes, they will definitely work.?
Car starter batteries are more designed around offering a maximum amperage to kick over the motor.? for astro that's not important -? instead we want greater battery capacity, hence amp-hours if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more. just FYI B |
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Re: Just purchased GM811GHD
Yes for that amount of money you ca buy a 50 Amp/hr battery.
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John Hobbs
hobbs_john@... -----Original Message----- From: Brian Valente bvalente@... [Losmandy_users] To: Losmandy_users Sent: Thu, Dec 7, 2017 11:10 am Subject: Re: [Losmandy_users] Re: Just purchased GM811GHD
?
I'm not sure that's a great battery for astro (although that seems like a good price for a general battery safety thing). 1200 amps is the max for starting a car, which is not important for steady power to astro gear. the important one is 22amp hours. A straight 22 amp hour 12v battery is about $45.?
B
On Thu, Dec 7, 2017 at 5:47 AM, steve hammel shammel00@... [Losmandy_users] <Losmandy_users@...> wrote:
Brian?
Brian Valente
portfolio
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Re: Just purchased GM811GHD
开云体育But if you buy a bare battery you of course also need a charger, connectors for whatever you want to hook to it, an inverter if you have stuff that needs 110VAC, and probably some kind of case.?Going the other way, there’s this kind of thing??which costs quite a bit more per watt-hour, but it’s a lithium battery so weighs only about 1/3 of the lead-acid equivalent, and has 5V, 12V, and 110V outputs. Although, come to think of it, a lead-acid battery is still light weight compared to a Losmandy mount. :) ??-Les On Dec 7, 2017, at 8:10 AM, Brian Valente bvalente@... [Losmandy_users] <Losmandy_users@...> wrote:
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Re: Just purchased GM811GHD
wes Bolin
I bought the jump-start battery with minimum number of bells and whistles at Harbor Freight for about $50.? It ran all night with my G11GT and still showed a green led saying it was charged.? YMMV. Wes On Thu, Dec 7, 2017 at 10:10 AM, Brian Valente bvalente@... [Losmandy_users] <Losmandy_users@...> wrote:
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Re: Just purchased GM811GHD
I'm not sure that's a great battery for astro (although that seems like a good price for a general battery safety thing). 1200 amps is the max for starting a car, which is not important for steady power to astro gear. the important one is 22amp hours. A straight 22 amp hour 12v battery is about $45.? B On Thu, Dec 7, 2017 at 5:47 AM, steve hammel shammel00@... [Losmandy_users] <Losmandy_users@...> wrote:
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Brian? Brian Valente portfolio |
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Re: Just purchased GM811GHD
For a battery pack? check out Lowe's they have a Shuemacher 1200 hundred amp power pack on sale for $100
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It has 12 volt Outlets plus a 110 inverter.? Just an option?
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Re: G11 cable management
At 08:13 07-12-17, jfev5mnsvqiyzpq756wvokt55jve7sbg2esr5mip@... [Losmandy_us wrote:
A slight detour from the topic, but as I'm trying to get to know the full landscape:There is the Explore Scientific GoTo system which can be retrofitted to G-11 mounts. It uses stepper motors that are not noisy. The best information about this that I have found is at: David |
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Re: Just purchased GM811GHD
Thank you all for the help! I just got my GM811GHD!?
I bought a large rolling toolbox from home depot and bought some foam online to make a cheap but protective case such as the pelican cases (not airline safe though). I'll use this for the RA and DEC axis' and any smaller accessories. I got an Orion padded telescope case to carry the HD tripod around (that thing is a beast). Luckily my apartments have an elevator so rolling/carrying these down won't be too difficult.? I also just purchased a QHY Polemaster that will come in the mail this week.? Still deciding on if I need to get the RA extension yet. Might try to machine something myself to do something similar.? Next will be to figure out how to DIY a portable 12V battery pack? I'll probably make a more detailed post on how I DIY'd my carrying solution for the mount + tripod. Can't wait for clear skies to try everything out! |
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Re: G11 cable management
开云体育Magnus,The stepper motors are the original motors used on the G11, they do not support Go To, just tracking and guiding. I replaced them only because I wanted to remotely control my telescope. They are still available as an option on the web site. 'G11 S - G11 Mount with Digital Control 492 System. Stepper Motors outboard of mount. Standard 2 Point Worm Gear Block Assembly.' Regards Paul
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Re: G11 cable management
Hi!
A slight detour from the topic, but as I'm trying to get to know the full landscape: - what stepper motors? I see that there are stepper motors sold by Losmandy, and another set for using with a different GoTo system in Germany. But what are the Losmandy stepper motors for? I recently upgraded my servo motors to new high torque servo motors.. should I have had steppers instead? Magnus |
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Re: G11 cable management
开云体育Chip,It’s funny you should say that, the first thing that people comment about when they see my tucked in motors is “they are a lot quieter than normal”. I hadn’t noticed because I moved from the stepper motors, which are effectively silent. Regards Paul
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David Cochrun
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