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

Post by Sivakis »

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

Post by orly_andico »

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

Post by orly_andico »

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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Favourite scope: Astrotech AT66ED APO

Re: My Barn Door Tracker

Post by Sivakis »

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

Post by orly_andico »

Sim Lim Tower.

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Sivakis
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Joined: Mon Aug 10, 2009 12:55 pm
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Re: My Barn Door Tracker

Post by Sivakis »

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

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