Home | Classifieds | History | Technical | Links | Store | About Us | Email
Topics Topics Edit Profile Profile Help/Instructions Help Member List Register  
Search Last 1|3|7 Days Search Search Tree View Tree View  

Checking taper bores on gears

Old Marine Engine » Gears, Transmissions, and Propellers » Checking taper bores on gears « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Richard Alcock
Senior Member
Username: raa

Post Number: 65
Registered: 02-2007


Posted on Tuesday, November 26, 2013 - 08:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

This is a easy way to check to see what the taper angle is on a bore. Pour in Ceroloy(woods Metal) and find a local machine shop to use their shadow graph. It only takes a few minutes to use the shadow graph to find the taper of the Ceroloy plug. In this case it is 10 degrees on a side.taper bore checkingtaper bore checkingtaper bore checkingtaper bore checkingtaper bore checking
Top of pagePrevious messageNext messageBottom of page Link to this message

J.B. Castagnos
Senior Member
Username: jb_castagnos

Post Number: 847
Registered: 07-2002


Posted on Tuesday, November 26, 2013 - 08:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Learned two things, how to get the taper from the gear and that such a machine exist.
Top of pagePrevious messageNext messageBottom of page Link to this message

miro forest
Senior Member
Username: miro

Post Number: 730
Registered: 11-2001


Posted on Monday, December 02, 2013 - 08:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

OK Dick - now that you know what the taper in the bore is, how are you going to do the dental work to fix the broken teeth?

miro
Top of pagePrevious messageNext messageBottom of page Link to this message

Richard Alcock
Senior Member
Username: raa

Post Number: 66
Registered: 02-2007


Posted on Monday, December 02, 2013 - 08:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

That is the easy part. I picked up two 3.75x .627 class 40 cast iron blanks today for $10. Will turn the blanks asap and take them down to a gear shop in Rockford and for $75 will get them hobbed 12 dp 14.5 pa 42 tooth. After hobbing will finish bore them. One get s a .875/.876 bore and the other get a 10 degree tapered bore. I will mike the ceroloy slug the get the right minor dia.
Top of pagePrevious messageNext messageBottom of page Link to this message

Keith Billet
Senior Member
Username: keith

Post Number: 405
Registered: 02-2002


Posted on Monday, December 02, 2013 - 10:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Dick.
What engine are you working on?
Top of pagePrevious messageNext messageBottom of page Link to this message

Richard Alcock
Senior Member
Username: raa

Post Number: 67
Registered: 02-2007


Posted on Tuesday, December 03, 2013 - 12:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

These two gears are used on a fire pump which I was told was made in Canada. Sure looks like a Waterman K2 with copper jackets. The carb is a standard Schebler but is mounted under the intake manifold instead a normal K2 position. The gears drive a magneto of undetermined parents.
Top of pagePrevious messageNext messageBottom of page Link to this message

J.B. Castagnos
Senior Member
Username: jb_castagnos

Post Number: 848
Registered: 07-2002


Posted on Tuesday, December 03, 2013 - 05:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Those gears would have been good candidates for a ring gear shrunk in place. Machine the old teeth off, make a ring, shrink it on and have the teeth cut. You can drill and tap several small holes in the parting line and install screws with loctite for security.
Top of pagePrevious messageNext messageBottom of page Link to this message

Keith Billet
Senior Member
Username: keith

Post Number: 406
Registered: 02-2002


Posted on Tuesday, December 03, 2013 - 11:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

That's a great idea J.B. I will have to keep that in mind for the future.
Top of pagePrevious messageNext messageBottom of page Link to this message

Richard Alcock
Senior Member
Username: raa

Post Number: 68
Registered: 02-2007


Posted on Tuesday, December 03, 2013 - 12:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

In my case the other gear was all busted up so I had no choice. The other issue would be if the gear blank were hobbed it would require a mandrel to support the rings. I shaped probably held on the id with chuck.The ring id would certainly work well if the gear hub were complex.
Top of pagePrevious messageNext messageBottom of page Link to this message

Richard Alcock
Senior Member
Username: raa

Post Number: 71
Registered: 02-2007


Posted on Thursday, December 05, 2013 - 11:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I dropped off the gear blanks this morning and took a few pictures of gear hobbers and gear shapers so that if you have never seen one you can see how the gear tooth is formed. These are old manual machines which helps keep the cost down and are more than adequate for the typical old marine engine.
I thought I would also pass along a good shop to get gears made: Carmona Gear Cutting,2415 Kishwaukee St. Rockford, Il. 815 963-8236 ask for either Robert or Victor Carmonagear machinesgear machinesgear machinesgear machines
Top of pagePrevious messageNext messageBottom of page Link to this message

Richard Alcock
Senior Member
Username: raa

Post Number: 73
Registered: 02-2007


Posted on Wednesday, December 18, 2013 - 04:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I used the Ceroloy plug casting to check as I machined the bore.gear with tapered boregear with tapered boregear with tapered bore
Top of pagePrevious messageNext messageBottom of page Link to this message

J.B. Castagnos
Senior Member
Username: jb_castagnos

Post Number: 855
Registered: 07-2002


Posted on Wednesday, December 18, 2013 - 07:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The gear looks good Dick, you're getting full use out of this run of the Ceroloy.

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Password:
E-mail:
Options: Automatically activate URLs in message
Action:

Administration Administration Log Out Log Out   Previous Page Previous Page Next Page Next Page

Home | Classifieds | History | Technical | Links | Store | About Us | Email
&copy 2005 OldMarineEngine.com, P.O. Box 188, Forest Dale, VT 05745-0188 • Phone: 802-247-4864 • All rights reserved.
   Marine Engine Seloc Repair Manual Lookup Tool

marine gas engine repair and restoration