Shop Floor Talk  

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

SFT Search:   
Reply
 
Thread Tools Display Modes
  #31  
Old 08-22-2016, 10:30 PM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 8,496
Default

I got the gear box out without a problem! I have been procrastinating taking it out not wanting to screw something up. Still haven't found the problem, so far everything looks good.
Attached Thumbnails
Click image for larger version

Name:	1.jpg
Views:	167
Size:	75.1 KB
ID:	135004   Click image for larger version

Name:	2.jpg
Views:	172
Size:	94.0 KB
ID:	135005   Click image for larger version

Name:	3.jpg
Views:	172
Size:	97.1 KB
ID:	135006  
__________________
Drawing by Smartdraw
Reply With Quote
  #32  
Old 08-23-2016, 04:00 AM
cutter's Avatar
cutter cutter is offline

12-29-1943 to 1-17-2020
Curmudgeon emeritus
 
Join Date: Jun 2004
Location: Lubbock,Texas
Posts: 33,114
Default

Damn, that's a gearbox.
__________________
cutter
Housekeeping Staff: the Gatekeeper
Director of Policy, Syntax and Grammar (by appointment)

"Dr. Chandran, will I dream?"

Just Keep Walking

"I am not a body, I am free.
For I am still as God created me."
Reply With Quote
  #33  
Old 08-28-2016, 08:25 AM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 8,496
Default

Well I got the A shifting knob to travel from A-1 to A 3 but it turns very hard when passing A 2. I think the problem was a timing issue with the gears that the A knob turns. The knob turns four gears before the last gear moves the selector gear set. I am gonna have to go in. The A knob shaft is able to be pushed in so there has to be a snap ring missing inside. Who ever was in there before definitely didn't use spanner wrenches because of the shape the nuts are in so the first step is to make spanner wrenches.
Attached Thumbnails
Click image for larger version

Name:	2.jpg
Views:	114
Size:	92.1 KB
ID:	135105   Click image for larger version

Name:	3.jpg
Views:	102
Size:	100.1 KB
ID:	135106   Click image for larger version

Name:	4.jpg
Views:	110
Size:	99.2 KB
ID:	135107   Click image for larger version

Name:	5.jpg
Views:	113
Size:	83.9 KB
ID:	135108   Click image for larger version

Name:	6.jpg
Views:	144
Size:	94.5 KB
ID:	135109  

__________________
Drawing by Smartdraw
Reply With Quote
  #34  
Old 08-28-2016, 12:59 PM
cutter's Avatar
cutter cutter is offline

12-29-1943 to 1-17-2020
Curmudgeon emeritus
 
Join Date: Jun 2004
Location: Lubbock,Texas
Posts: 33,114
Default

That's a beautiful wrench, Ted.
__________________
cutter
Housekeeping Staff: the Gatekeeper
Director of Policy, Syntax and Grammar (by appointment)

"Dr. Chandran, will I dream?"

Just Keep Walking

"I am not a body, I am free.
For I am still as God created me."
Reply With Quote
  #35  
Old 09-01-2016, 11:48 AM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 8,496
Default

I kept digging until I found the problem. I don't know how this could ever happen but a brass gear that positions a selector gear is bent. It never turns under power and only turns when changing gears. It is bent enough so it will not make a full revolution when bolted in place. What do we think is the best idea to straighten a none replaceable gear, The gear has a .5" shaft turned on each end.

1 gear in place

2 removed

3 between centers it is about .0035" out

4 held in a collet it about .012" out

5 gear
Attached Thumbnails
Click image for larger version

Name:	1.jpg
Views:	125
Size:	97.7 KB
ID:	135296   Click image for larger version

Name:	2.jpg
Views:	123
Size:	99.6 KB
ID:	135297   Click image for larger version

Name:	3.jpg
Views:	119
Size:	93.0 KB
ID:	135298   Click image for larger version

Name:	4.jpg
Views:	117
Size:	94.7 KB
ID:	135299   Click image for larger version

Name:	5.jpg
Views:	112
Size:	75.1 KB
ID:	135300  

__________________
Drawing by Smartdraw
Reply With Quote
  #36  
Old 09-01-2016, 11:55 AM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 8,496
Default

Do you think I could bring it back with some how when it held in the collet in the lathe with a hammer and a brass punch formed to fit the 1/2" shaft?
__________________
Drawing by Smartdraw
Reply With Quote
  #37  
Old 09-01-2016, 07:15 PM
toprecycler's Avatar
toprecycler toprecycler is offline
Administrator
 
Join Date: Jan 2009
Location: Petoskey, Michigan
Posts: 4,783
Default

Quote:
Originally Posted by digr View Post
Do you think I could bring it back with some how when it held in the collet in the lathe with a hammer and a brass punch formed to fit the 1/2" shaft?
very gently in an arbor press. Set up dial inductor to locate high spots and to let you know how far you are pressing. Trial and error fix.

Brian
__________________
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
  #38  
Old 09-01-2016, 07:34 PM
terry lingle's Avatar
terry lingle terry lingle is offline
Something's Fishy ...
 
Join Date: Aug 2004
Location: Birch Island, BC, Canada
Posts: 5,505
Default

Which end shaft is bent?
Is it binding because the gear interferes with the gear it mates with or is the bind in the mount blocks?
If it is only a drive to change gears it will not be very critical.
Here are some choices to fix or improve the operation.
You say it is only .0035 out so you can make a close fitting mandrel that slips over the bent shaft and straighten it.
You can grab the gear in a four jaw and turn the bent shaft a couple of thou. You can try adjusting the mounting blocks.
Another option is to loosen the mounting blocks and run a piece of .002 brass shim stock through the tight spot then tighten the mounting blocks.
That may straighten it a little or force the clearances toward a looser fit.
Good luck with this issue
__________________
Life beats the alternative hands down.
Reply With Quote
  #39  
Old 09-01-2016, 08:10 PM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 8,496
Default

I got it. It spins free and easy now. It ended up being the short shaft that was bent. It was .015" out. I put the short end in a four jaw, indicated it true and gently beat the other end true within .003" with a plastic headed hammer. I still don't understand how it got bent. Now we will see if I can get it all back together. What do you think blue lock tite or no on the bolts. Some of the high rise lock washers are missing also. Thanks for the advice! I just couldn't wait. It has to spin easy because the brass gear is the last of six gears that the knob turns to move a sliding gear.
__________________
Drawing by Smartdraw
Reply With Quote
  #40  
Old 09-01-2016, 08:52 PM
milomilo's Avatar
milomilo milomilo is offline
Auction Addict
 
Join Date: May 2010
Location: Wheatland, Wyoming
Posts: 16,452
Default

Quote:
Originally Posted by digr View Post
I got it. It spins free and easy now. It ended up being the short shaft that was bent. It was .015" out. I put the short end in a four jaw, indicated it true and gently beat the other end true within .003" with a plastic headed hammer. I still don't understand how it got bent. Now we will see if I can get it all back together. What do you think blue lock tite or no on the bolts. Some of the high rise lock washers are missing also. Thanks for the advice! I just couldn't wait. It has to spin easy because the brass gear is the last of six gears that the knob turns to move a sliding gear.
If none of the bolts were loose, I'd not use lock tite.
__________________
Chris

The question isn't who is going to let me; it's who is going to stop me.
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 07:39 AM.


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