Rotary to linear drive
by mgg942, published
This is a reworked update of Things 614962 and 652717.
The geometry has been corrected to give a more truly linear output, and some fixing points have been enlarged for greater robustness.
A complete set of stl file have been uploaded here.
The model is based on mechanism 329 from 507movements.com.
Designed in Moi and made in PLA on an Ultimaker 1.
Resolution: 0.2 mm layers
Notes:Please check orientation prior to printing. I used PLA and recommend it over ABS for this application. I recommend 1.2mm walls and 40% fill. For the larger prints I used a brim. I used support for one item only - the smaller gear. This was a disadvantage of the improved geometry. In the earlier version I cheated a bit on the geometry to make the gear easier to print but when I (recently) created an animation of the older version I was a bit shocked by how much adverse effect the cheat had on the linearity of the output. Hence the redesign.
Generally I design holes in which something rotates to a nominal dimension such as 6mm diameter or 8mm diameter and the male parts about 0.3mm of 0.4mm under nominal.
Post printing I use hand reamers to bring the holes to the correct size and roundness.
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Rotary to linear drive by mgg942 is licensed under the Creative Commons - Attribution license.
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