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'Machined' means the ends of the ballscrew have been turned on a lathe. This is to create a smooth and accurate cylindrical surface to attach the bearings and coupling. The ballscrew will not be...

You can control the speed of a modified servo ... just remove the potentiometer from the casing, make the wires a bit longer and that's your speed control. The closer you move the pot. to the...

bear in mind that the type of bearing blocks and rails we use in cnc are going to be pretty heavy to be lugging around in the field

it may be cheeper to buy carbon fibre rods, maybe 30mm or 40mm...

i forgot to say that you need to remove the mechanical link to the feedback pot in the RC servo to get it to run endlessly in which ever direction (and speed) you dail into the servo tester

for focus stacking i would just concentrait on camera stability and hand crank a gearbox attached to a 1mm pitch screw to drive it (backlash wont be an issue as you will only be driving in one...

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this is a pan tilt head i made a few of years ago for stopmotion animation so hand cranking them was the way to go (motion blur has to be done in post production with stopmotion)

the...

for the tracking shots i would use a simple RC servo with a servo tester to drive it and add a step down gearbox of some description... should be easy to build and cost £30/£40 ish for the drive side...

A Tutorial on motor torque calculations

A question oft asked on MYCNCUK is "how big a motor do I need?". There is no simple answer to this, and the options are usually:
a) follow someone elses...

The limit switches are micro switches with an attached lever.

They are available from RadioShack and the like; the ones shown here are from Mouser.com (part number 101-1203).

They are single...