making a Barn-door tracking platform

[garygoh]

Hi to all, i want to make a barn-door tracking platform that is motorised but i can't find the motor that i want in Sim Lim tower is there anyplace i could get the following item in singapore :
-4-Rpm,3-volt DC Motor
-16-tooth spur gear
-64-tooth spur gear
-10-32 brass treaded rod

or any local website that sells the following item.

hope to hear from you all, Tks .

[weixing]

Hi,
You can try RS or farnell:
1) RS Component: http://www.rssingapore.com/
2) Farnell: http://sg.farnell.com

But might be more expensive.

Have a nice day.

[michael]

for 4 rpm u btr use some device to control your speed.

u can use normal gear motor for it. it is available in simlim and quite cheap.

[garygoh]

hi michael what kind of device can i use to control the speed, i want to simlim tower to find the motor but only one shop on the 3th floor got a 3V ,3 rpm DC motor. But i can't fine the spur gear to step down the speed to turn 1 RPM.If you know of any shop pls tell me Tks.

[michael]

hi michael what kind of device can i use to control the speed, i want to simlim tower to find the motor but only one shop on the 3th floor got a 3V ,3 rpm DC motor. But i can't fine the spur gear to step down the speed to turn 1 RPM.If you know of any shop pls tell me Tks.

i dn't know where u get the project for Barn-door. if u dn't mind can i have a look which type of project r u building? i know about barn door..are u going for astrophotography or only for visual perpose. it only will track about few munits. i can give u some idea to get parts in singapore.

about motor, u have to make a pwm circuit for the dc motor to control.

u can use other voltage to drive motor.


spor gear u can get at jalan basar, i dn't know the name...i bought my gear from there. u can see the yellow pages. anyway it wont be easy to get gear what u want.

[garygoh]

i want to do this for astrophotography, the june issure of SKY and telescope got a guide on making one.can you tell me where can i get the part in singapore, you have made one barndoor already?
tks:>

[michael]

i want to do this for astrophotography, the june issure of SKY and telescope got a guide on making one.can you tell me where can i get the part in singapore, you have made one barndoor already?
tks:>

i didn't make but i was thinking to make one.

i am not shure why they show 3rpm motor to use. if i am not wrong it should be with gear head motor. u can't get like this at simlim. u have to modifie there project for your self. actually all u can get at simlim and jalan basar hardware shop. they are selling many types of gear and trreaded rod too. i bought for my Alt-Az mount. i use stepper motor to track.

[vermin498]

Wouldn't it be easier if u use stepper motor instead? it is quite cheap to get if u know where and what to look for ..... then write a simple program on a 'PIC' chip to run the motor ... then you would not need a step down gear.... you will still need some sort of gears to run the barn door component but it will only be used as a saving mechanism for your drive motors .... I was thinkin of building one but haven't got the time to doing it .... anyway all the best and let me know of ur progress .... cheers

[kayheem]

If it is only for widefield astrophotography, how about this:

http://www.telescope.com/shopping/produ ... ductID=296

This is a mini-EQ mount that accepts a RA drive. Less hassle (but more expensive) to build your own.