Shaft coupler woes - Page 2 - SailNet Community
 LinkBack Thread Tools
Old 06-30-2008
Telstar 28

Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 18 Times in 14 Posts
Rep Power: 16

it depends on how well machined the shaft and face are to begun with. If they're relatively true, should be able to sneak by without facing and fitting, but will probably end up with more wear and tear on the shaft in the long run.
Quote:
Originally Posted by jr438234606 View Post
Is it possible to get a true fit, or at least an acceptably true fit, without having the coupler machined to the shaft? I realize that would be ideal, but it's not very practicle for me right now.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline
Sponsored Links
Advertisement

Old 06-30-2008
Senior Member

Join Date: Sep 2006
Location: Scotland
Posts: 2,365
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 11

Here is a link to help calculate the interference between shaft and coupling...

http://www.tribology-abc.com/calculators/e3_8.htm

It looks like a typical interference ratio... delta/d... is about 0.001. The units in the article are those silly metric things.

Anyway, a shaft of diameter 1.25" should have an interference delta of about a thousandth of the shaft diameter, or about 1.25 thousandths of an inch, or 1.25 thou" as it is written sometimes.

I am not familiar with the surface finish arguments there, but it looks very much like you have consider them also.

Still, it gives an idea of what the designers have to consider.

Rockter.

Last edited by Rockter; 06-30-2008 at 08:34 PM.
Rockter is offline
Old 07-01-2008
Senior Member

Join Date: Sep 2006
Location: Scotland
Posts: 2,365
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 11

Hal...

I am shocked, stunned, and deeply hurt.

I want a full written apology, carved in 3" letters into a solid granite slab, 3 ft x 4 ft x 24 ft, sent to Scotland by 6 pm today, GMT.

I said 0.43 thou"..... and not 0.43" .......yeeeeaaaarrrrgggghhhhh

That is 0.43 thousandths of an inch, and not 0.43 inch.

Don't miss the thou" bit.

0.43 thou" is an interference fit and won't go in without force but 0.43" won't go in at all, at all.

Rockter.

Last edited by Rockter; 07-01-2008 at 04:53 AM.
Rockter is offline

Old 07-01-2008
Senior Member

Join Date: Sep 2006
Location: Scotland
Posts: 2,365
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 11

There is one hour and 3 minutes left.
Rockter is offline
Old 07-01-2008
Senior Member

Join Date: May 2008
Location: sw florida
Posts: 196
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9

how close is close enough

Following the above instructions would most certainly ensure a proper fit of the coupling to the shaft. My boat has a large rusty chunk of something between the prop shaft and transmission. I know this because I am always saying to myself "that don't look right".
funsailthekeys is offline
Old 07-01-2008
Telstar 28

Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 18 Times in 14 Posts
Rep Power: 16

Not anymore.
Quote:
Originally Posted by Rockter View Post
There is one hour and 3 minutes left.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline
Old 07-01-2008
Senior Member

Join Date: Sep 2006
Location: Scotland
Posts: 2,365
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 11

Saildog...

I guess I just have to sulk.
He though I meant an interference of 0.43" on a 1.25" shaft!!!!!
How do you write thou" anyway?
I mean what can you do but sulk?
I am sulking.
I have been sulking for 4.5 hours.
Rockter is offline
Old 07-01-2008
Telstar 28

Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 18 Times in 14 Posts
Rep Power: 16

A sulking scotsman is not a pretty sight. You wrote it properly, he mis-read it.
Quote:
Originally Posted by Rockter View Post
Saildog...

I guess I just have to sulk.
He though I meant an interference of 0.43" on a 1.25" shaft!!!!!
How do you write thou" anyway?
I mean what can you do but sulk?
I am sulking.
I have been sulking for 4.5 hours.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline
Old 07-01-2008
Senior Member

Join Date: Jan 2003
Location: Maine Coast
Posts: 6,400
Thanks: 22
Thanked 303 Times in 235 Posts
Rep Power: 18

Quote:
Originally Posted by Rockter View Post
Hal...

I am shocked, stunned, and deeply hurt.

I want a full written apology, carved in 3" letters into a solid granite slab, 3 ft x 4 ft x 24 ft, sent to Scotland by 6 pm today, GMT.

I said 0.43 thou"..... and not 0.43" .......yeeeeaaaarrrrgggghhhhh

That is 0.43 thousandths of an inch, and not 0.43 inch.

Don't miss the thou" bit.

0.43 thou" is an interference fit and won't go in without force but 0.43" won't go in at all, at all.

Rockter.
Rock I read it correctly! I was just making a little light fun hence all the smilies and winkies and the lack of me including "thou" in my response... I thought the winkines would be a give away that I was merely ribbing ya...

Your carved granite apology slab is in the mail postage due on receipt..!!

______
-Maine Sail / CS-36T

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

© Images In Posts Property of Compass Marine Inc.

Maine Sail is offline
Old 07-02-2008
Senior Member

Join Date: Sep 2006
Location: Scotland
Posts: 2,365
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 11

Yea, but 0.43".
It's a disgrace!!!
Rockter is offline

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

## Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Password
 Please enter a password for your user account. Note that passwords are case-sensitive. Password: Confirm Password:
Email Address
 Please enter a valid email address for yourself. Email Address:
OR

## Log-in

 User Name Password Remember Me?
Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

 Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 Thread Tools Show Printable Version Show Printable Version Email this Page Email this Page

 Similar Threads Thread Thread Starter Forum Replies Last Post ljbabin Gear & Maintenance 10 06-06-2009 11:18 AM dhornsey Gear & Maintenance 20 06-30-2008 02:07 PM clayjay Gear & Maintenance 24 03-13-2008 08:17 PM thurston Gear & Maintenance 2 12-31-2001 06:00 AM Tom Wood Gear and Maintenance Articles 0 04-27-1999 08:00 PM

 Posting Rules You may post new threads You may post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OnTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

For the best viewing experience please update your browser to Google Chrome
 Terms of Use