Re: gear grinding

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Posted by DanO on June 10, 2003 at 08:03:19:

In Reply to: gear grinding posted by jason o on May 28, 2003 at 16:27:20:

This depends on if the gear grinding machine is
a 'generating' type or a 'form' type. Considering
a spur form, the wheel on a 'form' type grinder
is an involute. The 'generating' type gear grinder
uses some mechanical method to utilize the same
process as the hobber to generate an involute
form on the same principle about some base diameter,
the gear requires, the base diameter being the
origin point of the involute (visualize a string
unwrapping from a diameter with a pencil on it;
the line drawn is an involute of that base dia).
The form grinder has trouble grinding a helical
form however because of a 'heel and toe' scrubbing
of the form so a transformation must be applied
to the form in order to compensate for this and
trim extra material away from the form to match
the amount of material interference. There are
several articles written in the literature that
have defined this transformation. I have used
one by Oliver Saari written years ago to adapt
this to a major producer of gear grinding equipment
to dress a form that will grind helical gears using
a CNC dresser, correctly predicting the form to
result in the helical gear using a 'form type
machine. I believe it was the first such application.
It worked quite well. I believe there are many
others on the market now doing this.There are
many forms of 'generating' type grinders that
work well, most of them using some form of a
base roll.

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