Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Machining

SFT Search:   
Reply
 
Thread Tools Display Modes
  #1  
Old 10-09-2020, 12:59 PM
Cavalry's Avatar
Cavalry Cavalry is offline
Below Wholesale
 
Join Date: Jul 2005
Location: Evil Empire State
Posts: 9,034
Default Loader Pin Debacle

A simple job made overly complicated.
I acquired a clapped out wheel loader last year that desperately needs pins and bushings on the bucket pivots. I popped apart what was left and guessed it was 1.5" diameter pins. I originally was going to machine both the pins and bushings but after finding some 1.5" 4140 prehard in my steel rack said I'll buy the bushings and make the pins to save some time and get this thing back together.
All the pin bosses have wear, but i didn't know how much exactly. The pin material I had on hand measures 1.495" which would be great for a 1.500 ID bushing and they were a bit loose in the bosses but acceptable for this pile of shit.

I got a little surprise when the OE bushings arrived and were 1.496 ID" Whoops. I have neither the time or inclination to repair all the bosses and then make or buy 1.490" pins.
The replacement bushings are very hard so reaming/turning is out. with the carbide technology I have. I could anneal and re harden but I have no clue what they are made of exactly and it would likely go bad.
I did just buy a tool post grinder which would make simple work of enlarging the ID of bushings but wont have it until next week and do not know completeness or functionality.
The only other thing I thought of which is kind of a terrible idea is to turn the 1.495 pins 2/3 of the way to 1.490. That way I get one boss that fits kind of good but can still get it in the bushing. Maybe make a collar of shim stock and loctite it in for the loose boss? Its going to be a low hour use machine a couple hundred hours a year would be a lot.
Any other ideas?
__________________
Director of Cryptography-Upstate NY Division

Last edited by Cavalry; 10-09-2020 at 03:33 PM.
Reply With Quote
  #2  
Old 10-09-2020, 02:06 PM
greywynd's Avatar
greywynd greywynd is offline
I can dig it
 
Join Date: Dec 2005
Location: Wainwright, Alberta
Posts: 5,351
Default

Tool post grinder and make the pins 1.490?


Sent from my iPhone using ShopFloorTalk
Reply With Quote
  #3  
Old 10-09-2020, 02:18 PM
toprecycler's Avatar
toprecycler toprecycler is offline
Administrator
 
Join Date: Jan 2009
Location: Petoskey, Michigan
Posts: 4,900
Default

If it is just for home use, unless you need super tight tolerances, it probably would be fine to turn 2/3rds of the pin to 1.490”. As long as you can get grease into it, you probably will not notice it too much.

But, it all depends on how fine of bucket control you need for your application.


Sent from my iPhone using ShopFloorTalk
__________________
Brian

You don't know what you don't know.

"It's what you learn after you know it all that counts." John Wooden
Reply With Quote
  #4  
Old 10-09-2020, 02:21 PM
digger doug's Avatar
digger doug digger doug is offline
Not to be used as a Flotation Device
 
Join Date: Jan 2008
Location: NW Pa
Posts: 12,752
Default

A box tool in the lathe would take those pins right down in one pass, hold size, and leave a very good finish.
Reply With Quote
  #5  
Old 10-09-2020, 03:14 PM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 8,562
Default

Tool post, do it wright and forget it IMHO
__________________
Drawing by Smartdraw
Reply With Quote
  #6  
Old 10-09-2020, 03:40 PM
Cavalry's Avatar
Cavalry Cavalry is offline
Below Wholesale
 
Join Date: Jul 2005
Location: Evil Empire State
Posts: 9,034
Default

Quote:
Originally Posted by greywynd View Post
Tool post grinder and make the pins 1.490?


Sent from my iPhone using ShopFloorTalk

I really don't want undersized (well correct size) pins as the bosses are worn. the 1.495 pin material fits reasonably well in the worn bosses. Do do it "more correctly" I should ream the bosses out to a uniform size like 1.500, grind the bushings to 1.505 and make new pins.
__________________
Director of Cryptography-Upstate NY Division
Reply With Quote
  #7  
Old 10-09-2020, 03:44 PM
Cavalry's Avatar
Cavalry Cavalry is offline
Below Wholesale
 
Join Date: Jul 2005
Location: Evil Empire State
Posts: 9,034
Default

Quote:
Originally Posted by toprecycler View Post
If it is just for home use, unless you need super tight tolerances, it probably would be fine to turn 2/3rds of the pin to 1.490”. As long as you can get grease into it, you probably will not notice it too much.

But, it all depends on how fine of bucket control you need for your application.


Sent from my iPhone using ShopFloorTalk

The purpose of this machine was to save my Kubota MX5100 tractor. Digging into gravel banks, pushing snow, killing vegitation. I refer to the loader as the hatchet and the tractor as the scalpel
__________________
Director of Cryptography-Upstate NY Division
Reply With Quote
Reply

Thread Tools
Display Modes

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

Web Search:

All times are GMT -5. The time now is 11:40 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.