[modeleng] Re: Ideas wanted

Thanks Jeff and Harry.

My ideas thus far are:

The ideas so far are,
1) grind up a milling cutter to half the profile, then run the metal through 
in two passes, hopeing that the "joins" meet!

2) ditto but for the shaper. Much easier to make the tool for that.

2) Chuck the bar in the lathe and turn off the widest parts, thus leaving a 
rectangle with rounded ends.
This ends to be the smallest radius.

Then make a jig to hold them at a wide radius, probably close to the edge of 
a faceplate, turn so as to machine one side to the large radius, then 
reverse in jig and ditto for the other side.
Might be easiest, and better balance, to make two jigs and do two at the 
same time.
Then, there would just be some hand work to blend the two radii.


Alan Stepney

http://www.alanstepney.info
Model Engineering & steam engine information pages
----- Original Message ----- 
From: "Harry Wade" <hww@xxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, February 28, 2007 2:28 PM
Subject: [modeleng] Re: Ideas wanted


At 09:01 AM 2/28/07 -0500, you wrote:
>Or, could you grind a single point form tool - Jeff

Alan,
      This is my first thought also, and it could be done in quarters as
well as halves, however the problem would be, how to hold the sticks during
flycutting?  It's a very small section with very little rigidity.
     This would be a fiddley business, but it comes to mind that one could
make two jigs.  The first would hold the rectangular stock under a
continuous clamping bar along the off-side.  In this jig the first quarter
pass would be made along the near side, then reverse the stock and make the
second quarter pass.  The second jig would be slotted to cradle the
finished elipse half, again under a continuous clamping bar, where the
remaining quarter passes would be made as in the first operation.
     To insure alingnment perhaps the sticks could be made over-length so
that a short section of rectangle is left on an end.  This "key" would then
rest in the slot in the jig assuring that the quarters would be milled
identically at 90 degr.  I'm sure I've missed something but if I had the
job that's what I would try first.


Regards,
Harry Wade
Nashville  Tennessee

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