Re: Re: What do we want?

Several years ago I had a woodchuck type device for my router. This sends
the router along an x axis via cables and spins a piese of wood between
centers with some gearing. I used it for turning table legs, newel posts,
etc. I had a lot of problems with shavings and dust getting into the cables.
What I did was to build an open topped wooden box around the cable and
extending past the pulleys. The ends were capped, but inside at each end
was a large wooden pulley. A piece of flexible vinyl was attached to the
router carraige and ran across the top, down one pulley, through the box and
up around the other pulley to attach to the other side of the carriage. As
the carriage went back and forth, the vinyl slipped around the pulleys.
This kept the worst of the crap out.

I was looking at making a telescoping metal cover, but I moved and sold the
thing. Haven't really missed it, it had a lot of other design problems.

Marshall Pharoah
Software Engineer
Adirondac Software
PIC/6805/6811/68000
Asm/C/C++

-----Original Message-----
From: Bertho Boman <boman@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Tuesday, October 19, 1999 8:54 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: What do we want?

>From: Bertho Boman <boman@...>
>
>I would also worry about bigger pieces of wood getting stuck between the

chain and sprocket and locking up the movement.

>Bertho
>==============================
>
>> "Ian Wright" <Ian@...> wrote:
>>
>> Hi Andrew,
>>
>> In theory, a chain drive should be less accurate than a cable as movement
>> round the sprockets is not continuous. That is, the links of the chain go
>> round the sprocket as a series of straight lines rather than a pure

curve.

>> Whether the resulting (small) error is significant in your application

would

>> have to be a part of your considerations.
>>
>> Ian
>> --
>> Ian W. Wright
>> Sheffield UK
>
>>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems in the above catagories.

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