Pulley & Idler for string driven Rostock

by Hendrik, published

Pulley & Idler for string driven Rostock by Hendrik Dec 6, 2012
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Pulley & Idler for string driven Rostock

This Thing is a work in progress. You may want to check it out every now and then as updates and/or additions may be uploaded.



11 Dec 2012: Update
Added an idler matching the pulley
Separated parameters in parameter file for the OpenSCAD users/pupils
Added "Resolution and spectra length.ods" to help you calculate diameters and spectra length

Remark: If you downloaded before today, please redo as the first version contained a glitch

1) Print
2) Post pic
3) Use
4) Give feedback

1) File is 'parameterized' and preset for use with M3 nuts and bolts
2) This is my first OpenSCAD adventure. Hope it works out well (didn't print it myself yet as I am still building my printer).

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reminds me of my original design for my prusa before I found a source for timing belts.

I had built a repstrap out of 3 dot matrix printers and one was an old apple image writer. It used a tensiled wire coated in rubber to drive the head. Essentially had wound on the spool attached to the motor enough wire to go the length between the 2 pulleys once ( no need for double as head cant move past the pulley) plus a couple of turns to ensure it stayed wound properly. It had both end achored at the top and bottom of the pulley on the motor with half wound on each side so there was a loop in the middle that went up to the other pulley and back, as head goes to one side the wire unwound from the top and wound back on the bottom and vice versa.

Kinda wished I had gone with that idea to begin with as there's very little backlash if setup correctly

What sort of wire/string are you going to use with this and how many turns around the pulley are you planning?

Hi Simon,

Thanks for the question. I have .2mm Spectra braided wire which is a lot thinner than most others are using. The hole for the wire is preset at 1mm but can be changed via the params section at the top of the SCAD file.

As for number of turns, I tested with 5 turns on either side and had some slippage, so I'll go for a double or triple pass through the hole.

There are some interesting threads on the subject on: https://groups.google.com/forum/?fromgroups#!topicsearchin/deltabot/spectrahttps://groups.google.com/foru...

(You can search for spectra, fishing line or fisherman, ... or browse through the while group as it is quite interesting and educational).

Hope this answers the questions.