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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 463
Registered: 07-2002
| | Posted on Sunday, August 09, 2009 - 03:54 pm: | 
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Over a yeare ago I welded this crank for a friend. The flywheel was loose so we had the crank ground .020" over, Dickie Gibbens bored the flywheel for a snug fit. Instead of setting the case up in the lathe and boring it, I decided to make a ream. Took an old piece of shaft and turned the pilot to fit the bearings, left it .020" over at the step. I milled some slots at the step and sharpened the leading edges, it cut through and did a nice hob, just wish I had cut the slots deeper, they had to be cleaned out often.  |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 2147
Registered: 11-2001
| | Posted on Monday, August 10, 2009 - 05:58 am: |
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*
J.B.
Excellent looking work ! Wondering how you support the reamer for alignment ?
Seeing the reamer reminded me of looking at some old engine machine tools at an eng show awhile ago. Wooden case with "Stevens" name on it had a reamer bar and iron frame to bolt on eng block to line ream main brngs on Model T fords, also had tooling to pour bearings, seemed to me a step up from hand scraping to fit !
Appreciate the photo post!
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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 464
Registered: 07-2002
| | Posted on Monday, August 10, 2009 - 06:16 am: |
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Richard, the reamer pilot was long enough to fit through all three bearings. The bearings were in good shape so they supported the reamer. The cutting section of the reamer is 1 3/8 + .020", same as the crankshaft, it was self supporting. I built it with a one time use in mind, but it looks like I'll need it on an engine I just took apart. |
rbprice
Senior Member
Username: rbprice
Post Number: 253
Registered: 11-2001
| | Posted on Monday, August 10, 2009 - 10:09 am: |
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Nice work JB - what engine is it that has three nice bearings on a two cylinder engine?
Cheers
Bob |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 465
Registered: 07-2002
| | Posted on Monday, August 10, 2009 - 01:37 pm: |
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You're telling on yourself Bob, you're a 4 cycle man. The 2 cycle engines need a main between the crankcases to separate them. This is for Ernest Felterman's 8hp L-A. Due to health reasons Ernest hasn't been able to work on the motor, he and his son came over last week and we got a good start, hope to finish soon. |
rbprice
Senior Member
Username: rbprice
Post Number: 254
Registered: 11-2001
| | Posted on Monday, August 10, 2009 - 04:02 pm: |
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YEAH, yeah - but you are correct, I do tend to think of four cycle first off.
Thanks for the correction JB.
Stay cool and we will drink a few for you while at Mystic this weekend.
Bob
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