Flat top knuckle machining - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Axle Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old January 22nd, 2009, 11:13 PM   #1
RANGER_DANGER
Now I Got a V8!
 
RANGER_DANGER's Avatar
 
Join Date: 11-06-06
Location: Sanford/Midland
Posts: 692
iTrader: (14)
Mentioned: 0 Post(s)
Send a message via AIM to RANGER_DANGER
Default Flat top knuckle machining

I have FSJ flat top knuckles for a dana 44 and don't know if the top should be machined 90* to the spindle mounting surface. Should it actually be 80* like in the pic? I was going to just buy arms with a 10* correction. So if I did that would the top just have to be milled smooth and tapped at the stock angle?


RANGER_DANGER is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old January 23rd, 2009, 12:17 AM   #2
Monkeyevil
I <3 Miatas
 
Monkeyevil's Avatar
 
Join Date: 11-05-05
Location: Kalamazoo, MI
Posts: 8,988
iTrader: (16)
Mentioned: 3 Post(s)
Send a message via AIM to Monkeyevil
Default

80* to the spindle surface.
__________________
JcrOffroad
Zoom Zoom!
Monkeyevil is offline   Reply With Quote
Old January 23rd, 2009, 08:40 AM   #3
95geo
newbie
 
95geo's Avatar
 
Join Date: 11-05-05
Location: dryden
Posts: 5,777
iTrader: (6)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by Monkeyevil View Post
80* to the spindle surface.
yep!

I always clean the bottom off really well and use that to sit on and then fixture it up from there.
95geo is offline   Reply With Quote
Old January 23rd, 2009, 11:45 AM   #4
RANGER_DANGER
Now I Got a V8!
 
RANGER_DANGER's Avatar
 
Join Date: 11-06-06
Location: Sanford/Midland
Posts: 692
iTrader: (14)
Mentioned: 0 Post(s)
Send a message via AIM to RANGER_DANGER
Default

Okay, so that will have a slope towards the spindle mounting surface right? Right now my buddy that's machining it says they are 7* off. So he would just want to change the angle by 3* not 10*.
RANGER_DANGER is offline   Reply With Quote
Old January 23rd, 2009, 11:57 AM   #5
PavementPounder
I am the law.
 
PavementPounder's Avatar
 
Join Date: 11-05-05
Location: Birmingham, Michigan 48009
Posts: 29,824
iTrader: (224)
Mentioned: 2 Post(s)
Default

Quote:
Originally Posted by RANGER_DANGER View Post
Okay, so that will have a slope towards the spindle mounting surface right? Right now my buddy that's machining it says they are 7* off. So he would just want to change the angle by 3* not 10*.
You don't want to set it up to be 3° different from "whatever the surface is currently at". The spindle surface is your datum, not the top of the knuckle. If you set up based on the top to machine the difference, you risk not ending up with the correct 80° angle to the spindle surface (due to measurement error or incorrect fixturing) and a possible compound angle depending how the top of the knuckle was manufactured (previously machined, virgin cast surface, etc). There will also be small amounts of variation between the two knuckles, so setting up from the surface to be machined will yield different results left to right.

Just set up to go 80° from the spindle surface regardless of whatever the top of the knuckle is currently at. By doing it this way, you can tell if there was an undesireable compound angle going on before you started by observing for any spot that was missed by the cutter. Then you can make another pass and go a little deeper if you need to in order to ensure the entire surface is flat.

Last edited by PävementPounder; January 23rd, 2009 at 12:06 PM. Reason: Didn't explain it well. Probably still didn't.
PavementPounder is offline   Reply With Quote
Old January 23rd, 2009, 12:13 PM   #6
RANGER_DANGER
Now I Got a V8!
 
RANGER_DANGER's Avatar
 
Join Date: 11-06-06
Location: Sanford/Midland
Posts: 692
iTrader: (14)
Mentioned: 0 Post(s)
Send a message via AIM to RANGER_DANGER
Default

Okay, so 80* angling towards the SMS correct?
RANGER_DANGER is offline   Reply With Quote
Old January 23rd, 2009, 12:28 PM   #7
95geo
newbie
 
95geo's Avatar
 
Join Date: 11-05-05
Location: dryden
Posts: 5,777
iTrader: (6)
Mentioned: 0 Post(s)
Default

you really cant go wrong by locating off the bottom machined face of the knuckle for the angle.... it will be the right angle nomatter what the number is... and from what I remember the angle was 6 or 7 degrees on the 44's that I have machined.... I havent done it in a long time so it could be different?
95geo is offline   Reply With Quote
Old January 23rd, 2009, 01:06 PM   #8
RANGER_DANGER
Now I Got a V8!
 
RANGER_DANGER's Avatar
 
Join Date: 11-06-06
Location: Sanford/Midland
Posts: 692
iTrader: (14)
Mentioned: 0 Post(s)
Send a message via AIM to RANGER_DANGER
Default

He said it was 7 degrees off so it would be like 83 degrees toward the SMS when the SMS was straight up and down. So would it be 80 degrees with the slope towards the SMS not the ball joint? Just want to make sure it's done correct so I don't waste a set of knuckles.
RANGER_DANGER is offline   Reply With Quote
Old January 23rd, 2009, 01:14 PM   #9
Monkeyevil
I <3 Miatas
 
Monkeyevil's Avatar
 
Join Date: 11-05-05
Location: Kalamazoo, MI
Posts: 8,988
iTrader: (16)
Mentioned: 3 Post(s)
Send a message via AIM to Monkeyevil
Default

My jig holds the spindle studs..

__________________
JcrOffroad
Zoom Zoom!
Monkeyevil is offline   Reply With Quote
Old January 23rd, 2009, 01:20 PM   #10
PavementPounder
I am the law.
 
PavementPounder's Avatar
 
Join Date: 11-05-05
Location: Birmingham, Michigan 48009
Posts: 29,824
iTrader: (224)
Mentioned: 2 Post(s)
Default

Quote:
Originally Posted by Monkeyevil View Post
My jig holds the spindle studs..


Hard to tell from the angle, but I assume that vertical plate is flat against the SMS, or has pads to it?
PavementPounder is offline   Reply With Quote
Old January 23rd, 2009, 01:35 PM   #11
brimy311
Smells like a Fork Liftis
 
brimy311's Avatar
 
Join Date: 11-05-05
Location: Kzoo, mi
Posts: 4,092
iTrader: (42)
Mentioned: 0 Post(s)
Send a message via AIM to brimy311
Default

Quote:
Originally Posted by PavementPounder View Post


Hard to tell from the angle, but I assume that vertical plate is flat against the SMS, or has pads to it?

Yes, flat against the SMS.
__________________
JcrOffroad.com
Like us on Faceook!
brimy311 is offline   Reply With Quote
Old January 23rd, 2009, 01:45 PM   #12
RANGER_DANGER
Now I Got a V8!
 
RANGER_DANGER's Avatar
 
Join Date: 11-06-06
Location: Sanford/Midland
Posts: 692
iTrader: (14)
Mentioned: 0 Post(s)
Send a message via AIM to RANGER_DANGER
Default

Quote:
Originally Posted by Monkeyevil View Post
My jig holds the spindle studs..

Do you have a pic of the final product (doesn't need holes in it)? Preferably in that jig and camera level with the knuckle so I can see the angle and everything. If so, that would help a ton!
RANGER_DANGER is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Axle Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off

Forum Jump


All times are GMT -5. The time now is 04:43 AM.


Powered by: vBulletin, Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 0.17506 seconds with 58 queries