Re: [CAD_CAM_EDM_DRO] Re: Guides

Jan, I can hear voice of experience.
Just want to point out that in this application loads are very small,
basically it just
involves positioning.
I think I will be able to make it quite rigid with chain approach, and
hopefully
within budget.
Alex

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, May 13, 2003 5:39 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Guides


> In a message dated 5/13/2003 3:44:27 PM Central Standard Time,
> telecomt@... writes:
>
> > What do you think, can I swap teethed belt for a #40 chain?
> >
>
> I have no PERSONAL experience doing this, but I built a large machine,
once,
> which used sprocket-chain to "synchronize" two long lead-screws, and this
> failed rapidly. The machine's owner (in England!) replaced all the
sprockets
> and chain with rubber "timing belt" as you propose, and that failed
> eventually, as well---I have NO idea which lasted longer! So, they
simply
> REMOVED one X-lead-screw, and let the rigidity of the carriage determine
> accuracy, and they were happy with that, so, I guess they simply did not
MILL
> with the router near the "free end". I really have NO idea, as I was not
> there, once it got running in '86.
>
> Now, if you want PRECISION and NON-slip/no-play in "timing belt/chain"
look
> to W.M.Berg's polyurethane-coated cable-chain series! That is super
stuff,
> if $$ is not a determining factor in a design.
>
> It's a sad fact of life, if you must build a machine that has NO dead-play
> and "repeatability", you simply have to resign yourself to spending some
> MONEY! Usually, the result will then cost you LESS than were you to go
> ahead and build it TOO cheaply, as many do! I KNOW! Been there, DONE
that!
>
> Jan Rowland
>
>
> [Non-text portions of this message have been removed]
>
>
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