My Barn Door Tracker

Wanna make a scope? Or better still, grind a mirror yourself. Or, you have some good tips in making a really useful accessory? This is the place to show what your hands can do...
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Sivakis
 
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Favourite scope: Astrotech AT66ED APO

Re: My Barn Door Tracker

Postby Sivakis » Thu Sep 05, 2013 12:45 pm

Arrgh. Guess that option's out the window.....

Ok, how about this - I buy a 12V 10RPM motor, connect 2x 6V batteries (series) so that it runs at 10RPM. Then I use a 2nd gear that is 10x the diameter of the gear attached to the motor to reduce the speed to 1RPM.

Would that be more accurate? Or still not getting it?

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orly_andico
 
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Re: My Barn Door Tracker

Postby orly_andico » Thu Sep 05, 2013 3:30 pm

it's not the gear diameter, but rather the number of teeth. There's this shop in the basement of Sim Lim Tower that sells DC motor gearhead with slow speeds. Not sure if they have a 10 RPM one but they do have a 30 RPM one. They also sell various gears and stuff, so you could start counting teeth...

also Tamiya sells many gearboxes with fixed ratios. You could check that out.

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orly_andico
 
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Re: My Barn Door Tracker

Postby orly_andico » Thu Sep 05, 2013 3:35 pm

Here's a (rather pricey) 1.5 RPM gear motor.

http://sg.element14.com/crouzet/8286220 ... dp/3087335

Since it's 1.5 RPM you'd need to move the bolt some distance further from the hinge.

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Sivakis
 
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Re: My Barn Door Tracker

Postby Sivakis » Thu Sep 05, 2013 8:07 pm

Thanks orly.

Looks like a trip to SLS is... inevitable.... hopefully they can also give me tips on how I should go about this [smilie=confused.gif]

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orly_andico
 
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Re: My Barn Door Tracker

Postby orly_andico » Thu Sep 05, 2013 11:18 pm

Sim Lim Tower.

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Sivakis
 
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Joined: Mon Aug 10, 2009 12:55 pm
Favourite scope: Astrotech AT66ED APO

Re: My Barn Door Tracker

Postby Sivakis » Fri Sep 06, 2013 9:08 am

Ah yes what was I thinking... SLT... thanks!

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