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I decided I might try to make a new hub out of aluminum
to replace the "two time" cracked bronze hub that
was in the gear case. I got started on the lathe work,
boring out the stock that needs threaded but had to
stop going further as my inside threading bar isn’t going
to do the job. The bit in my threading bar sits back
3/8" from the end of the bar. I need to cut threads
within 1/8" from the bottom of the bore.
Perhaps one of you machinist can suggest a inexpensive
boring bar that would do the trick?
My lathe has the Aloris type quick change too holders.
The bit holders will take up to 1/2" square bit I believe,
but I use them with 3/8" bits. Also have a boring bar
holder that takes tools with 5/8" round shanks.
I’ve only tried inside threading a couple of times playing
around, so hopefully I can figure it out!
Attachments:
Prepare to be boarded!
I spent the last day and 1/2 making the new piece for the Johnson.
I couldn’t wait for the internal threading bar I ordered, but dug around
and found a lightweight, homemade, round-stock, tool with the end
bent 90 degrees and ground for threading. It worked okay,
but I had to make very light cuts.
The piece threads on real nice to the prop shaft gear threads,
so I was happier than a June groom.
I tried to make the piece a little "beefier" than the original,
but spend most of today "nipping and tucking" to get satisfactory
clearances.
As I was playing with all the parts, tipping the gear case "cone"
upside down, the little nickle sized slug (that goes between
the adjustable thrush washer/ bushing and adjustment thread)
fell out, and was never seen again. After crawling around on
my knees for ten minutes, I fired the lathe back up and made one
of those, lol.
All in all, it was a fun project, but don’t think I’ll going in the machining
business anytime soon.
Attachments:
Prepare to be boarded!
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