Re: Can anyone advise me please?

Hi Dave.
Thanks very much for your reply.
To be honest I dont know what resolution I need. I want to make the indexer to use on a small cnc router hopefully to recreate some of the ornamental type patterns on to objects turned from wood ( small vases, stands etc.)
I have the timing pulleys from a heath robinson machine I built a few years ago ( Non cnc , all turning by hand ) I uses it to put barley twist onto miniature stems etc.these pulleys are all thats left of it so I would like to use them rather than buy new ones :-) if possible.
I will look into it a bit more.
Thanks again.
Graham

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "David G. LeVine" <dlevine@...> wrote:
>
> On 02/16/2013 03:42 AM, snokket wrote:
> > Hi.
> > can any one give me some advice please.
> > I am building an indexer or fourth axis and have several timing belt pulleys but am not sure which ones to use to get the best results.
> > The number of teeth on the ones I have are --- 12 24 32 36 48 60.
> > Any help will be gratefully received.
> > Thanks.
> > Gray
>
> It's complicated. First of all, what resolution do you want? One
> degree required a 200:360 ratio, or 1:1.8
>
> Minutes (desirable for cutting some gears) or seconds is a lot harder.
> Let's assume a 1:1 ratio and a 35 tooth gear, each tooth is 10.28571429
> or so degrees, 1.8 degree steps just won't cut it. With one minute
> resolution, you can get within 0.1%, with 1 second resolution, you can
> get within 1/60th of that.
>
> Dave 8{)
>
> --
>
>
> /"Among the many misdeeds of British rule in India, history will look
> upon the Act of depriving a whole nation of arms as the blackest."/
>
> Mohandus Ghandi, An Autobiography, Page 446.
>
>
> [Non-text portions of this message have been removed]
>