Shaft Log / Cutlass Bearing - tight fit...?
 

My new Buck Algonquin bronze shaft log is advertised as being bored to
accept a 1.5" cutlass bearing. My new Duramax cutlass bearing is
advertised as having an outside diameter od 1.5" (to accommodate a 1"
prop shaft).

I tried to slide the Bearing into the Log - no way.

I got out the calipers; the O.D. of the bearing is indeed 1.50", but
the I.D. of the Log is just 1.4875"

Is it expected that one must heat / cool these pieces in order to get
them to fit? Or, did Buck Algonquin use the wrong "drill bit"?

If heating / cooling is expected, is it a hair dryer or a blow torch...


Many Thanks.

MW

Shaft Log / Cutlass Bearing - tight fit...?
 

On 15 Jan 2007 13:38:32 -0800, wrote:

My new Buck Algonquin bronze shaft log is advertised as being bored to
accept a 1.5" cutlass bearing. ///
I tried to slide the Bearing into the Log - no way.

I got out the calipers; the O.D. of the bearing is indeed 1.50", but
the I.D. of the Log is just 1.4875"

Is it expected that one must heat / cool these pieces in order to get
them to fit?

Many Thanks.
MW


the ratio of diameters is 1.5000 / 1.4875 = 1.0084

Brass and bronze alloys typically show thermal linear
expansivities of 16 to 19 ppm per degC
To expand by 0.8% would need a temp rise of more
than 525 degC This is not the usual range for
shrinking in place.
I expect the Buck bearing housing should have been
machined to fit e.g a 1 X 1.5 inch bearing.

Brian Whatcott Altus OK

Shaft Log / Cutlass Bearing - tight fit...?
 

Mike,
Call someone.
Shaft log fittings and struts for bronze carrier cutlass bearing only
come two ways:
1 - light press fit
2 - fastener retained.
..0125 Ain't NO Light Press and if you can't get the bearing in at all
then don't bother look for where the screws that hold the bearing go.

Two Possiblities:
1 - the log casting missed the final reaming step. Fortunately, this
can be done by hand in place, but the reamer is and expensive tool.
2 - the casting was made for one of the new all rubber cutlass bearings.

I think you better call someone at Algonquin.

Matt Colie


wrote:
My new Buck Algonquin bronze shaft log is advertised as being bored to
accept a 1.5" cutlass bearing. My new Duramax cutlass bearing is
advertised as having an outside diameter od 1.5" (to accommodate a 1"
prop shaft).

I tried to slide the Bearing into the Log - no way.

I got out the calipers; the O.D. of the bearing is indeed 1.50", but
the I.D. of the Log is just 1.4875"

Is it expected that one must heat / cool these pieces in order to get
them to fit? Or, did Buck Algonquin use the wrong "drill bit"?

If heating / cooling is expected, is it a hair dryer or a blow torch...


Many Thanks.

MW

Shaft Log / Cutlass Bearing - tight fit...?
 

Don't heat the log, chill the cutless bearing. Pack it in dry ice, or a
dry ice/alcohol slush for a half hour or so and you'll find it slides
right in. It will expand, holding it in place as it was designed to do.

Shaft Log / Cutlass Bearing - tight fit...?
 

On 16 Jan 2007 04:18:40 -0800, "Keith"
wrote:

Don't heat the log, chill the cutless bearing. Pack it in dry ice, or a
dry ice/alcohol slush for a half hour or so and you'll find it slides
right in. It will expand, holding it in place as it was designed to do.


Supposing I worked the numbers correctly - that you would need
to heat the outer part by 500 degC plus - it is always possible to
produce the required difference the other way - by freezing the
inner part. Oh wait, there is no temperature in the universe that
is 500 degC cooler than ambient. Maybe not then.

Brian Whatcott Altus OK

Shaft Log / Cutlass Bearing - tight fit...?
 

Mike,
I had the yard mechanic remove the old and install the new cutlass bearing
on my GS 41 for $40 4 years ago. I'm sure it's gone up some by now.
He used a special puller/press and it took minutes to do.
MMC

wrote in message
ps.com...
My new Buck Algonquin bronze shaft log is advertised as being bored to
accept a 1.5" cutlass bearing. My new Duramax cutlass bearing is
advertised as having an outside diameter od 1.5" (to accommodate a 1"
prop shaft).

I tried to slide the Bearing into the Log - no way.

I got out the calipers; the O.D. of the bearing is indeed 1.50", but
the I.D. of the Log is just 1.4875"

Is it expected that one must heat / cool these pieces in order to get
them to fit? Or, did Buck Algonquin use the wrong "drill bit"?

If heating / cooling is expected, is it a hair dryer or a blow torch...


Many Thanks.

MW

Shaft Log / Cutlass Bearing - tight fit...?
 

I had the vendor call Buck Algonquin, They replied that the bore on
the log shoud measure .001 smaller than the bearing, i.e. 1.499".
Since mine measures 1.488, they decided to send me a replacement.

Yipee!

Thanks for all your replies.

MW

Shaft Log / Cutlass Bearing - tight fit...?
 

wrote:
My new Buck Algonquin bronze shaft log is advertised as being bored to
accept a 1.5" cutlass bearing. My new Duramax cutlass bearing is
advertised as having an outside diameter od 1.5" (to accommodate a 1"
prop shaft).

I tried to slide the Bearing into the Log - no way.

I got out the calipers; the O.D. of the bearing is indeed 1.50", but
the I.D. of the Log is just 1.4875"

Is it expected that one must heat / cool these pieces in order to get
them to fit? Or, did Buck Algonquin use the wrong "drill bit"?

If heating / cooling is expected, is it a hair dryer or a blow torch...


Many Thanks.

MW

Shaft Log / Cutlass Bearing - tight fit...?
 

On 22 Jan 2007 08:22:08 -0800, wrote:

I had the vendor call Buck Algonquin, They replied that the bore on
the log shoud measure .001 smaller than the bearing, i.e. 1.499".
Since mine measures 1.488, they decided to send me a replacement.

Yipee!

Thanks for all your replies.

MW

I earlier wrote this:
Brass and bronze alloys typically show thermal linear
expansivities of 16 to 19 ppm per degC
To expand by 0.8% would need a temp rise of more
than 525 degC This is not the usual range for
shrinking in place.
I expect the Buck bearing housing should have been
machined to fit e.g a 1 X 1.5 inch bearing.
******************

Now, to expand the diameter 3 thou over 1.5 inch
(for a little chilling allowance) - that's an expansion of
0.004/1.49 = 2685 parts per million.

So you would heat bronze by
2685/16 = 168 degrees.C (at most)

Or if you can pull it off with just one thou of slop,
boiling water would do it

Now THAT's more like it!

Brian Whatcott Altus OK

Shaft Log / Cutlass Bearing - tight fit...?
 

On 15 Jan, 21:38, wrote:
My new Buck Algonquin bronze shaft log is advertised as being bored to
accept a 1.5" cutlass bearing. My new Duramax cutlass bearing is
advertised as having an outside diameter od 1.5" (to accommodate a 1"
prop shaft).

I tried to slide the Bearing into the Log - no way.

I got out the calipers; the O.D. of the bearing is indeed 1.50", but
the I.D. of the Log is just 1.4875"

Is it expected that one must heat / cool these pieces in order to get
them to fit? Or, did Buck Algonquin use the wrong "drill bit"?

If heating / cooling is expected, is it a hair dryer or a blow torch...

Many Thanks.

MW


Why not buy a composite bearing machined to 0.5-0.15mm less than
carrier ID, slides in and should rotate easily, (this is a good way to
check for shaft alignment) then simply bed with epoxy. When you come
to change the bearing, simply heat the bearing carrier and it will
slide out like its on grease. No corrossion no pullers .

I have heard warnings that using dry ice to cool cutlass bearings will
seperate the bond between the rubber and the phenolic or bronze, but I
havn't tried this one myself.