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Message |
    
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1094
Registered: 07-2002
| | Posted on Wednesday, September 16, 2015 - 10:37 pm: | 
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I had a crank to repair for my friend Bob Legnon. I welded the mains and rods and began to grind it. I noticed it had been welded in the throw, thought it was done properly, wrong. While grinding the first throw it broke in the weld, pinched the grinding wheel and spit the crank out at me. I did what I should have done in the first place, made a new crank. I had pictures of the process but the phone died and I lost them, here's a picture of the finished crank and the plate it was cut from. This is for a two cylinder Waterman copper top. It was a little bit of a challenge because my Arnold gauge, the indicator that allows you to measure while grinding, stops at 1", the crank is 15/16, 7/8, and 3/4". It took a little longer but came out OK, need to get a crank polisher, would save time and allow a better finish. I cut out two complete blocks for the throws and rough turned the mains, it was stronger and better balanced this way, the throws were cut after.
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3665
Registered: 11-2001
| | Posted on Thursday, September 17, 2015 - 12:41 pm: |
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Wow ! Another piece of J.B. mechanical art work,
I would hate to hide it in a crankcase !
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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1096
Registered: 07-2002
| | Posted on Thursday, September 17, 2015 - 11:10 pm: |
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Thanks Richard, Bob might let it hang around on the table for a while. |
johnny
Senior Member
Username: johnny
Post Number: 547
Registered: 03-2006
| | Posted on Saturday, September 19, 2015 - 04:37 pm: |
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Very nice looking work JB.
How do you do your stress relief and hardening or do you? |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1097
Registered: 07-2002
| | Posted on Saturday, September 19, 2015 - 09:39 pm: |
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Thanks Johnny. No treatment, just machine and use. |
raa
Senior Member
Username: raa
Post Number: 96
Registered: 02-2007
| | Posted on Monday, September 21, 2015 - 01:23 pm: |
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great looking crank JB Your crank grinder sure beats cutting them out on a Lathe
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solarrog
Senior Member
Username: solarrog
Post Number: 599
Registered: 03-2002
| | Posted on Monday, September 21, 2015 - 01:36 pm: |
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is anybody reproducing the timer gears for the K2, mine fell apart. |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1099
Registered: 07-2002
| | Posted on Monday, September 21, 2015 - 06:56 pm: |
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Good job on yours Dick, was that one water jetted? |
raa
Senior Member
Username: raa
Post Number: 97
Registered: 02-2007
| | Posted on Monday, September 21, 2015 - 07:38 pm: |
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no it was flame cut out of 1045 annealed and Blanchard ground, tough turning for sure |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 3666
Registered: 11-2001
| | Posted on Tuesday, September 22, 2015 - 06:26 pm: |
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Dick
Good work, I appreciate the lathe setup photo, I am always impressed with the process of making your own crankshafts !
School is in session ( for me ), I looked up the Blanchard Rotary Grinding and discovered that it was started in 1911, all the many early engine parts with the semi circular striations on the machined faces I had thought they were milling machine made guess they could be either ??
In my time 1950's and later, cylinder heads, intake manifolds and engine blocks were ground on Rotary wet stones- was this the Blanchard Process ??
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raa
Senior Member
Username: raa
Post Number: 98
Registered: 02-2007
| | Posted on Tuesday, September 22, 2015 - 07:16 pm: |
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Richard
I have a good source for flat grinding. They have a whole herd of Blanchard grinders as well as large surface grinders such as Mattisson.
if anyone needs some grinding done let me know and I'll get you in touch. Both the Blanchard and the Mattisson grinders run wet.
cheers
Dick |
rbprice
Senior Member
Username: rbprice
Post Number: 529
Registered: 11-2001
| | Posted on Tuesday, September 22, 2015 - 09:09 pm: |
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Solarrog - do you have any pictures of your timing gears?
Bob |
solarrog
Senior Member
Username: solarrog
Post Number: 600
Registered: 03-2002
| | Posted on Wednesday, September 23, 2015 - 01:34 pm: |
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Yes of what is left, I lost the link to where the resizer tool was |
