| Author |
Message |
    
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1378
Registered: 07-2002
| | Posted on Tuesday, May 29, 2018 - 09:32 pm: | 
|
I'm about 3 years behind but I'm trying to catch up on the engine hobby work, another year or so I may be able to get back to my projects. These are a couple of cranks I did for friends, the single is an unknown that was worn and bent, key ways were waddled out. The twin is for a 2HP Buffalo, it had broken in the throw years ago, looked like it was acetylene welded. I re welded it, the rear section was cut from 1" to 7/8", I guess to true it up after welding. I build them up in the lathe, rough machine them, then grind them to size. My crank grinder was set up to turn between centers when I got it, no matter how little pressure you put it would tend to bow these little cranks. I bought two chucks and it seems to do a much better job.
|
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1379
Registered: 07-2002
| | Posted on Tuesday, May 29, 2018 - 09:35 pm: |
|
Here's the finished cranks.
 |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1380
Registered: 07-2002
| | Posted on Tuesday, May 29, 2018 - 09:48 pm: |
|
I found a before pic of the crank, you can see the weld on the last throw, the output shaft is noticeably smaller.
 |
raa
Senior Member
Username: raa
Post Number: 184
Registered: 02-2007
| | Posted on Wednesday, May 30, 2018 - 12:13 am: |
|
Is the ground for the wire welder going thru a bearing? If so not good for bearing
Cheers and thanks a bundle
Dick |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1381
Registered: 07-2002
| | Posted on Wednesday, May 30, 2018 - 06:25 am: |
|
The ground goes through a contact I made from a starter brush assembly. Four brushes on a brass slip ring. The trough keeps the argon around the crank, it gets hot enough that it would start oxidizing in the air. |
raa
Senior Member
Username: raa
Post Number: 185
Registered: 02-2007
| | Posted on Wednesday, May 30, 2018 - 04:20 pm: |
|
sounds like a great fix I have seen guys destroy bearings with a welder |
