The contact stress will be greatest at the tip of the pinion and the lowest will be at the greatest contact depth point of penetration of the pinion in the rack. Using an infinite number of teeth for the rack seems like an spproach to estimate the stresses as you suggest. The tangential forces...
You might try looking at a 13 tooth pinion on a 14 tooth blank
and center distance for a 14 tooth/ 35 tooth center distance
while you are checking out calculations
You can get your PHD if you figure out how to get the right torque.
In some cases the torque of the seals is greater than the frictional
torque. The amount of clearance or whether it is preloaded causes
great variation as well. Is this a thrust or radial bearing, etc,
is it a roller, ball or...
You are really limiting the function by using
flat washers as raceways. Contact several
bearing manufacturers with your request as to
ball and race material. If you can buy it, so
can they. Give the them the loads involved and how
you plan on shielding the bearing. What type of
grease is...
If the center distance is not fixed, I would recommend
a smaller profile change on the pinion to avoid not
only pointed teeth but assure than the addendum is not
truncated. Did these brittle pointed teeth break off
and create the debree that obviously was in the mesh?
This is a poor design...
What is the outside diameter???
Thanks for the drawing.
Is the od truncated like I suspect?
It appears to be about 25 percent which
is a lot if the od is 4.44 mm. This would
then give you a contact ratio of 1.107
assuming the center distance is 8.57 mm.
thetank8,
Please confirm your outside diameter of the pinion.
If the profile shift is 1.1 you would have pointed
teeth. Do you mean a profile shift of .55 ?
(9 plus 2 plus 2.2) x .35 yields 4.62 mm.
Is the outside diameter 4.62 mm? My layout shows
the hob creating a 4.44 mm truncating the...
The basic tooth thickness for a module is
1.5708 x the module which would give
a rough value of .5498mm or .0216 inches.
This is a little module of .35mm.
Somehow, I think debree entered the system
and caused jamming and a bad mesh problem.
Did tips of the pinion break off and then
bottom out...
The cleanliness of the steel, grain size, etc. all contribute.
You probably already know about vacuum degassed steels giving
exceptional life. If the pinion was hobbed, I would not expect
any root problem on it. I agree too that shotpeening would
help but may not be practical on this little...
The University of Akron has this periodical in the NE Regional Depository:
http://library.uakron.edu/record=b1853624~S24
The NE Regional Depository is located behind the medical college in Rootstown. You could call them and ask what would be the best way to request a copy of the article...
You might want to try this group. I think they have Elliot and Earle Buckingham's publications or should have. Note it is Buckingham and not Buckigham if you are trying to search for the article. If I can get to campus, I will check to see if they have the magazine in their technical...
You might want to incorporate a full fillet radius in the root.
Did the deformation of the tooth occur because of some debree
in the pinion root? Nothing wrong with the hardening specs.
How many teeth in the mating pinion?
Are you asking how do you get the material to the plastic stage or to its yield range
by applying pressure such are rolling etc and/or by applying heat?
