Re: Re: Engraving and engine turning

I bought a constant tension cable drive for C&H sales for $9.95. I used it
on my bandsaw to keep tension on the barstock as it rode thru the pinch
rollers of my cnc bandsaw. The constant tension cable was attached to the
end of the bar stock. This coupled with the ball bearing rollers made moving
large pieces of material thru my cnc bandsaw ( a $165 Enco hor/vert bandsaw)
very nicely.
Dan
-----Original Message-----
From: Steve Carlisle <quatsein@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Thursday, August 05, 1999 3:10 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Engraving and engine turning

>From: "Steve Carlisle" <quatsein@...>
>
>I have seen this type of spring in the Stock Drive
>catalog, called a Negator spring.
>
>Steve Carlisle
>
>----------
>From: David M. Munro <Munro@...>
>To: CAD_CAM_EDM_DRO@onelist.com
>Subject: Re: [CAD_CAM_EDM_DRO] Re: Engraving and engine turning
>Date: Thursday, August 05, 1999 6:18 AM
>
>From: "David M. Munro" <Munro@...>
>
>>From: "Ian W. Wright" <Ian@...>
>
>>Regarding the Tensator spring thing, I'm not sure it is the same
>>Tensator I know. The one I know from clocks - and which I thought was
>>the only one, needs two cylinders to wrap around. It is made in the same
>>fashion as a pocket tape measure spring, dished along its length and has
>>a natural tendency to straighten itself out. In clocks, it is this
>>force, rather than the more normal tensioning of a spiral spring which
>>is used to provide the drive. The spring you seem to describe is more
>>like a normal coiled spring and would follow Hookes Law 'Ut tensio, sic
>>vis' giving a non-linear force.
>>
>There are two types of constant force springs, the type Ian described which
>I once used in a clock, where the spring comes off the storage reel and
>winds "backwards" onto the takeup reel, to which it imputs a constant
>rotational force. The second type unwinds from a reel and imputs linear
>force to the thing that unwinds it. I've not seen these, and can't comment
>on how constant the force is.
>
>David M. Munro
>
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