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.
Type 4 barn door tracker.
4 4 out of 5 stars 127.
The double arm design was first described in an article by dave trott published in the february 1988 issue of sky telescope magazine.
Hello peter i m buidling a type 4 barn door tracker.
A barn door is a specialized type of equatorial mount.
You can however make a 6 wide board and use a 4 hinge but you may give up some stability.
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.
For a type 2 and type 3 drive b is measured from the drive arm hinge point to the sliding contact point.
I m about to order the motor now but don t know how to power it beause i m a greenhorn in electronics.
A sidereal day on earth is 23 hours 56 minutes and 4 091 seconds long or 1436 minutes about 4 minutes shorter than a standard solar day and we can use this time to calculate the rate at which the barn door tracker needs to turn.
A followup appeared in the april 1989 issue.
The mount shown here employs a type 4 double arm design.
Assembly setting up your door tracker.
Cut your two blocks of wood pieces into 13 x 4 pieces.
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The hinge you measure from depends on the drive geometry since this distance must not vary as the arms close.
For a type 1 and type 4 drive b is measured from the camera platform hinge point to the sliding contact point.