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Line boring early block
Posted: Sat Aug 03, 2019 8:20 pm
by Erik Barrett
One of today’s projects. Main bearings on a 1909 block.
Re: Line boring early block
Posted: Sat Aug 03, 2019 8:34 pm
by Henry K. Lee
That's an early Puppy Erik!'
Hank
Re: Line boring early block
Posted: Sat Aug 03, 2019 11:26 pm
by modeltbarn
Is that Mike's?
Re: Line boring early block
Posted: Sun Aug 04, 2019 3:10 am
by Erik Barrett
Yes it is an early one. Number is just over 5000. I know the owner as as Micheal.
Re: Line boring early block
Posted: Sun Aug 04, 2019 8:25 am
by John Warren
Thanks for sharing Eric. Always great to hear from you.
Re: Line boring early block
Posted: Sun Aug 04, 2019 10:01 am
by otrcman
Interesting picture, Erik. I've never actually seen a line boring operation, so maybe this is a dumb question (won't be my first ........ or last).
I notice that the block is not clamped down to the table. As a matter of fact, it appears to be sitting on a cushion of shop rags. So, what keeps the block aligned to the machine's drive during the boring operation ?
Thank you,
Dick
Re: Line boring early block
Posted: Tue Aug 06, 2019 9:54 pm
by NorthSouth
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If I remember my lessons from Rumble Seat Garage, the above photographs show only the first stage of a finely tuned two jig boring process.
Re: Line boring early block
Posted: Tue Aug 06, 2019 10:44 pm
by KimDobbins
Erik, if you lay a standard crank in the bearing surfaces, how much wear if there? Or was the block previously babbited?
Re: Line boring early block
Posted: Wed Aug 07, 2019 11:30 am
by Erik Barrett
The block is clamped down through the cylinder bores. The rags are there to protect the deck surface from scratching. The mill drives the bar with a flexible coupling so perfect alignment is not required, but I get it close. This block has been opened up to use babbit on the upper main bearings. Originally it would have run the crank in the iron bores.