Disaster Area
Cast Iron
- Joined
- May 6, 2005
i have a connecting rod (crank arm), that had its bore worn out. i bored it oversized with a boring head, and installed a (sae 660) bronze bearing with a press fit. a new spindle was also made to replace the old one.
my (very limited) understanding of bronze bearings is that under the following circumstances you must add an oil groove:
if the circumfrance of the bearing is > 1.0 inches (oil will travel in a un-grooved bearing only 0.5 inches axially in each direction from the oil hole)
the specifications for the oil groove are:
a. 1/16"deep, or 1/3 the wall thickness.
b. 1/8" wide
c. terminating not closer than 1/8", or (.05 x length of bearing) to end of bearing.
the thickness of the bronze bearing is .090", the diameter of the spindle (shown in photo) is 1 1/4 inches. the length of the spindle is 2 1/4 inches. the target rpm is below 100 rpm, and will have extremely heavy shock loads (its part of a planer).
my conclusion of the above, is that i must add an oil-groove (due to width of bearing), and it also must be helical (circumfrance of bearing is > 3", oil will only travel 1").
depth of oil-groove should be .030"
uh, is my assesment of the above correct?
can anyone reccomend a procedure to cut an internal helix in a bronze bearing (this will be my first helix).
tia
my (very limited) understanding of bronze bearings is that under the following circumstances you must add an oil groove:
if the circumfrance of the bearing is > 1.0 inches (oil will travel in a un-grooved bearing only 0.5 inches axially in each direction from the oil hole)
the specifications for the oil groove are:
a. 1/16"deep, or 1/3 the wall thickness.
b. 1/8" wide
c. terminating not closer than 1/8", or (.05 x length of bearing) to end of bearing.
the thickness of the bronze bearing is .090", the diameter of the spindle (shown in photo) is 1 1/4 inches. the length of the spindle is 2 1/4 inches. the target rpm is below 100 rpm, and will have extremely heavy shock loads (its part of a planer).
my conclusion of the above, is that i must add an oil-groove (due to width of bearing), and it also must be helical (circumfrance of bearing is > 3", oil will only travel 1").
depth of oil-groove should be .030"
uh, is my assesment of the above correct?
can anyone reccomend a procedure to cut an internal helix in a bronze bearing (this will be my first helix).
tia