well, it was a thought !
keep in mind that we are not talking about high speed or precission gears here
Chuck Harris <cfharris@...> wrote:
You can't do a decent job of cutting a bevel gear on a mill. To quote
Machinery's Handbook:
"Cutting Bevel Gear Teeth - A correctly formed bevel gear tooth has the same
sectional shape throughout its length, but on a uniformly diminishing scale from the
large to the small end. The only way to obtain this correct form is by using a gener-
ating type of bevel gear cutting machine. This accounts, in part, for the extensive use
of generating type gear cutting equipment in the production of bevel gears.
"Bevel gears too large to be cut...<snip>...
"Although generating methods are to be preferred, there are still some cases where
straight bevel gears are produced by milling. Milled gears cannot be produced with
the accuracy of generated gears and generally are not suitable for use in high-speed
applications or where angular motion must be transmitted with a high degree of
accuracy. Milled gears are used chiefly as replacement gears in certain applications,
and gears which are subsequently to be finished on generating type equipment are
sometimes roughed out by milling...
And having made bevel gears on a milling machine, I can attest to the truth of
this statement. They work like crap! Very rough turning.
-Chuck Harris
lothar baier wrote:
First off the 8640B was designed in spokane and as to my knowledge this division was disolved years ago, most
engineers were send to other divisions or into early retirement. This question would have to be answered by a ME and
not a EE , most large companies have a strict separation in between system engineering, mechanical engineering and
electrical engineering, then the ME who designed the gear doesnt necesarily have knowledge about who makes the gear
this is normally done by purchasing. so even the ME might not have the info you are looking for. I doubt HP used
catalog parts, HP was famous for custom parts, yes the qty was not too high for the stanbarts of running a injection
molder but first of you dont have to think in today standarts but have to think 20 to 30 years back plus the 8640 was
not cheap so HP could afford to pay a premium on the price. A CNC with a CNC Dividing head could possibly do the
job, you would have to slant the dividing head, the other part could be hobbed.
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