If the profile is offset before converting to polar coordinates then it 
will allow for the situation where you are grinding above or below the 
center line. If you convert the profile to polar then simply increase 
the distance you will get errors in the resultant cam profile.

Les


On 16/06/2011 16:40, Viesturs Lācis wrote:
> 2011/6/16 Dave<[email protected]>:
>> On 6/15/2011 12:37 PM, andy pugh wrote:
>>> On 15 June 2011 17:07, Viesturs Lācis<[email protected]>    wrote:
>>>
>>>> And, if the required CAM profile is offset by the radius of the
>>>> grinding wheel, then moving the center of grinding wheel along that
>>>> line will produce the required profile.
>>>>
>>> I don't think that this is true for all shapes of cam. If you consider
>>> a cam with a flat or near-flat face, the wheel will often be grinding
>>> a part of the cam significantly above or below the centreline.
>>>
>>>
>> That is correct....  if you look at the diagram I attached via the link
>> you can see how that can be.
> I do not understand, where is the problem besides defining initial
> shape to be produced.
> Once that is done, my suggestion would give You the code to do it.
> Guys, where do You see the problem? Do You think that grinding wheel
> will not be moved away or closer to camshaft in a correct manner, when
> camshaft is rotated?
>
> Viesturs


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