Get it as soon as mon sep 14.
Type 4 barn door tracker.
For a type 2 and type 3 drive b is measured from the drive arm hinge point to the sliding contact point.
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That means we want to spin our barn door tracker at a rate of 360 degrees every 24 hours which comes out to be 0 25 degrees per minute.
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You can however make a 6 wide board and use a 4 hinge but you may give up some stability.
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Ideally this drive requires a 1 rpm stepper motor however for shorter exposures on a stable platform tripod a well designed type 4 barn door tracker produces very acceptable results manually advancing the drive in small sequential steps in order to achieve one full revolution per minute.
The double arm design was first described in an article by dave trott published in the february 1988 issue of sky telescope magazine.
So my question is how to connect the motor which comes with two wires of about 18cm length to the power socket and how to switch between cw ccw.
Cut your two blocks of wood pieces into 13 x 4 pieces.
I m about to order the motor now but don t know how to power it beause i m a greenhorn in electronics.
Hello peter i m buidling a type 4 barn door tracker.
A barn door is a specialized type of equatorial mount.
A followup appeared in the april 1989 issue.
For a type 1 and type 4 drive b is measured from the camera platform hinge point to the sliding contact point.
The hinge you measure from depends on the drive geometry since this distance must not vary as the arms close.
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The mount shown here employs a type 4 double arm design.