Re: [CAD_CAM_EDM_DRO] Re: Gear milling

Why not just use your cnc equipment to make a fly cutter with a suitable
profile? If the gear is not too big and is in a fairly soft material
(aluminium, brass etc.) you can even make the fly cutter by turning the
profile on the end of a bar and then filing down to half thickness.
Otherwise, make a disc cutter by turning the profile on the edge of a disc
of tool steel, cut a notch out of one side and then mount the disc off
centre so the notch is furthest away from the spindle. This will give the
necessary relief.

______
( )
_____( ) excuse the hopeless ASCII
( O ) art but the cutting face is the flat
( ) bit on the left and its rotating
( ________) clockwise about the 'O'

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: <npalen@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 02 October 2001 03:18
Subject: [CAD_CAM_EDM_DRO] Re: Gear milling


> --- In CAD_CAM_EDM_DRO@y..., machines@n... wrote:
> > --- In CAD_CAM_EDM_DRO@y..., smoke@t... wrote:
> > > Anyone know of a SIMPLE program (possibly a plug in?) for
> > generating
> > > drawings of gears so's I can generate some g code for milling
> them?
> > >
> > Smoke,
> > Unless these are big gears how are you going to get a tool into the
> > gear shape?
> > Most of the gear generating programs are for wire eroders. Milling
> > with small cutters won't give you a deep enough face width.
> > There is a program here:-
> > http://www.simtel.net/pub/pd/41862.shtml
> > This will even generate the G code for you, or save as a DXF file,
> > but beware they are large files as it's all small moves.
> >
> > John Stevenson
>
> A possible solution for making gears for low speed applications would
> be laminating with rivets, screws etc. several thin gears machined
> out of sheet metal. The X and Y milling coordinates would generate
> the profile of the teeth around the periphery. The thin sheet metal
> would allow use of a small enough endmill diameter for a given tooth
> pitch as well as the keyslot. Machinery's Handbook should give tooth
> profiles which can be
> circular arrayed in a CAD program and dxf'd out for G-coding.
> Nelson Palen
>
>
>
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