[modeleng] Re: Another question
- From: Roger Mason <roger.g3tdm@xxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Thu, 14 Oct 2004 17:08:23 +0100
Hi,
Peter asked:
>Any ideas on how to cut a variable pitch spiral on a round rod?
>
The obvious one is CNC.
If that is not possible - how about a cam driven saddle?
or
How about the saddle moved along the bed by a lever system, which
in turn is driven by the normal leadscrew. As the lever gets to be at
right angles to the motion the speed along the bed increases.
or
I am sure a fusee could be used in some way, perhaps driving the
leadscrew on the lathe.
Alternatively any of these ideas might be used to move the ferrite
(or whatever) to alter the inductance in the electronic device you are
working on, and obtain the linear frequency/displacement curve that way?
I thought these days it was all done with PLL's, but perhaps this
coil is not on the oscillator side. Can I try out the communications
set when it is finished? ;-)
There is a spare saddle for a Myford on e-Bay at the moment - just
right for such experiments.
The project sounds to be interesting - need any further expertise?
Cheers,
Roger Mason, G3TDM, in St. Agnes.
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