New macro Rail.pdf

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Some may have seen the heavy duty macro rail and related threads. The project has gotten to a point

where I am mostly happy with it.

The system has been performing beyond expectations, bot just in accuracy, but in speeds and functionality.

The original spec was to be able to move a heavy camera and lense, these can weigh more then 4kg when

combined. After that i would need it to be able to calculate the depth of feild (DoF) , photo overlap and thus

distance between shots, from user inputs. This possed a sizeable issue as results could be due to many of

number being a fair amount less than 1 and some possibly being over 100. It must also be able to cope

with deep objects such as flowers that can exceed to 3.8cm limits of the DVD RW rails (which cn be hard to

mount flowers on by the way).

After some head scratching, lots of conversation both here and else where solutions started to appear for

various things. the design eveloved

this was an early design

proto rail by f2268d215cc925918731918f4efa0289, on Flickr

which evelved into something a little more complex

Exploded by f2268d215cc925918731918f4efa0289, on Flickr

this design made use of low backlash lead screw called a trapzoid thread cut to a very fine pitch. It was

suggested that i look into CNC hardware and the use off a ball screw and nut which forced a redesign

alongside production limitations, the final design was something that had teken some time to finalise

exploded by f2268d215cc925918731918f4efa0289, on Flickr

most of the component were design to be laser/water jeted to keep costs down.

rail by f2268d215cc925918731918f4efa0289, on Flickr

there was quite some delay while waiting for the aluminium parts due to being low on the priority list at

small engineering firm that helped me out with this part of the build. it did however allow me to do more

development on the electronics though, which had some last minuite changes.