Re: [CAD_CAM_EDM_DRO] Machining curved strip for a thickness

(changed the title because the one I started with was pretty vague)

That sounds like what I want.
What do they make the strip out of?

I'm not seeing how the drum pressure works. The drum is fairly
aggressive in grinding the fiberglass. If the fiberglass doesn't lay
pressed to the strip and the strip against the roller (or whatever),
then even if it would press flat with only a couple of pounds of force
the sander's going to cut it before pressing it flat and that would be
cutting beyond the specified thickness.

Danny

R Rogers wrote:

>
> "One of the better ideas is to machine a somewhat flexible strip that
>
> goes on the back of the fiberglass whose thickness increases as the
>
> fiberglass's specified thickness decreases, so when they're paired
>
> together the total thickness is constant and I can hard-attach a guild
>
> roller to the cutting head itself (not the table) at a fixed distance
>
> from the cutter and feed it through."
>
> This is how tapered lams for bows are cut. Works well. However the
> strip isn't flexible, rather a tapered block. The pressure of the drum
> sander holds the lam tight to the fixture.
>
> Thank You, Ron RogersRogers MachineRomaxxCNC http://www.romaxxcnc.com
> <http://www.romaxxcnc.com>
>
>
> --- On Sat, 10/25/08, Danny Miller <dannym@...
> <mailto:dannym%40austin.rr.com>> wrote:
> From: Danny Miller <dannym@... <mailto:dannym%40austin.rr.com>>
> Subject: [CAD_CAM_EDM_DRO] Machining width
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> Date: Saturday, October 25, 2008, 2:46 PM
>
> I have a case where I need to use a Taig to machine curved (bowed)
>
> fiberglass to a new, specific thickness which varies down its length. I
>
> can stand the part up on edge and probably use a diamond sanding drum
>
> for removing material from one side to achieve the desired thickness. I
>
> cannot start from a fiberglass block or anything like that it needs to
>
> be remachining these pieces already formed in a curve (the glass fibers
>
> need to run the length of the piece continuously) .
>
> How can I regulate the thickness? My first thought is to cut a holder
>
> in the exact curvature of the original piece, mount the fiberglass in it
>
> and run the cutter in a fixed toolpath. However, the part's original
>
> curvature may be slightly inconsistent and if it does not exactly fit
>
> the holder's curve then the thickness will be wrong. The fiberglass is
>
> too thick to force into a holder.
>
> I've had a number of ideas, even touch sensors to sense the thickness,
>
> but nothing's really jumping out at me here.
>
> One of the better ideas is to machine a somewhat flexible strip that
>
> goes on the back of the fiberglass whose thickness increases as the
>
> fiberglass's specified thickness decreases, so when they're paired
>
> together the total thickness is constant and I can hard-attach a guild
>
> roller to the cutting head itself (not the table) at a fixed distance
>
> from the cutter and feed it through.
>
> It's an idea but there's a lot of funk to that, the line between the
>
> guide roller and the cutter's center *must* be perpendicular to the
>
> fiberglass's curve. So there is thought of mouting only one end of the
>
> fiberglass to the Taig table, using a mount with a bearing that can
>
> support rotation, and use the Taig table to steer that end of the
>
> fiberglass back and forth to steer it as it feeds. It's a thought anyways.
>
> Any ideas?
>
> Danny
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