Our "engineer" bought a bearing and bar of precision ground rod. It
easily slipped through the bearing and since it had screws to lock it
down all was find untill. Untill i read the literature that came with
the bearing and it said to have a "Press Fit" if using their bearing
for "heavey loads" I just guessed that the 6,000 + lbs we were going
to support qualified. After doing some calculations our "engineer"
said i was right.
So he ordered some bar stock that has to be machined.
I told him to look it up in Machinerys Handbook for the tolerance
but he got it all wrong. When i tried to find it in there i found the
newer additions were a little confusing. So all i want to know is if
our bearing is 1.5000 what should the shaft be turned down to. The
width of bearing is about two inches.
Thanks
Rosco

If the ground stock is within a thousanth or so of 1.500" you can lock
the bearing to the shaft with Loctite bearing compound, available at
most hardware and auto supply stores.

Engineman


On Jul 27, 3:24�pm, Butter wrote:
�Our "engineer" bought a bearing and bar of precision ground rod. It
easily slipped through the bearing and since it had screws to lock it
down all was �find untill. Untill i read the literature that came with
the bearing and it said to have a "Press Fit" if using their bearing
for "heavey loads" I just guessed that the 6,000 + lbs we were going
to support qualified. After doing some calculations our "engineer"
said i was right.
�So he ordered some bar stock that has to be machined.
� I told him to look it up in Machinerys Handbook for the tolerance
but he got it all wrong. When i tried to find it in there i found the
newer additions were a little confusing. So all i want to know is if
our bearing is 1.5000 what should the shaft be turned down to. The
width of bearing is about two inches.
Thanks
Rosco

"Butter" wrote in message
...
Our "engineer" bought a bearing and bar of precision ground rod. It
easily slipped through the bearing and since it had screws to lock it
down all was find untill. Untill i read the literature that came with
the bearing and it said to have a "Press Fit" if using their bearing
for "heavey loads" I just guessed that the 6,000 + lbs we were going
to support qualified. After doing some calculations our "engineer"
said i was right.
So he ordered some bar stock that has to be machined.
I told him to look it up in Machinerys Handbook for the tolerance
but he got it all wrong. When i tried to find it in there i found the
newer additions were a little confusing. So all i want to know is if
our bearing is 1.5000 what should the shaft be turned down to. The
width of bearing is about two inches.
Thanks
Rosco

I had a high-speed shaper with 1.5" shaft and 2 matched Barden bearings on
one end. We made the shaft about .00025" - .0005" big (depending on the
temp) We heated the bearings on a lightbulb and seated them with a length
of tube and a hammer. I have since sold the shaper.

Butter wrote:

Our "engineer" bought a bearing and bar of precision ground rod. It
easily slipped through the bearing and since it had screws to lock it
down all was find untill. Untill i read the literature that came with
the bearing and it said to have a "Press Fit" if using their bearing
for "heavey loads" I just guessed that the 6,000 + lbs we were going
to support qualified. After doing some calculations our "engineer"
said i was right.

Did the bearing manual have information on the amount of interference? The reason I am
asking is a press fit is going to reduce the internal clearance of the bearing. That
isn't a bad thing since it may cause more rolling elements to support your load.


Wes

On Jul 28, 4:28*pm, Wes wrote:
Butter wrote:
Our "engineer" bought a bearing and bar of precision ground rod. It
easily slipped through the bearing and since it had screws to lock it
down all was *find untill. Untill i read the literature that came with
the bearing and it said to have a "Press Fit" if using their bearing
for "heavey loads" I just guessed that the 6,000 + lbs we were going
to support qualified. After doing some calculations our "engineer"
said i was right.

Did the bearing manual have information on the amount of interference? *The reason I am
asking is a press fit is going to reduce the internal clearance of the bearing. *That
isn't a bad thing since it may cause more rolling elements to support your load.

Wes

The info with the bearing only mentioned to use a presss fit if used
with a heavy load. I'm going to make shaft .001 over and that seems
about right.

On Jul 28, 8:24 am, Butter wrote:
Untill i read the literature that came with
the bearing and it said to have a "Press Fit" if using their bearing
for "heavey loads"

Rosco - theres a chart in my school textbook giving all this info
(including type of fit) - if it scans ok, happy to email you a copy.
(I learnt it, not saying I remember it...)
Andrew VK3BFA.

"Andrew VK3BFA" wrote in message
...
On Jul 28, 8:24 am, Butter wrote:
Untill i read the literature that came with
the bearing and it said to have a "Press Fit" if using their bearing
for "heavey loads"

Rosco - theres a chart in my school textbook giving all this info
(including type of fit) - if it scans ok, happy to email you a copy.
(I learnt it, not saying I remember it...)
Andrew VK3BFA.

Andrew: I would love to have a copy of it. Presently looking to re-design
a transmission for my helicopter and that information would be highly
desirable.
Stu Fields