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@REPLYADDR Bob La Londe <none@none.com99>
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On 9/26/2023 11:47 PM, Richard Smith wrote:
> Interested in details.
> Jim W. responded on thread
> "Re: Oldies but goodies Re: deburring inside drilled tubing?"
>
> "
> When I was hunting for low cost used components to build my bucket
> loader the owner of a hydraulics shop proudly showed me the large
> cylinder honing machine he had designed and built.
>
> Apparently the bore needs to be very smooth but not necessary exactly
> round or straight, the seals can accommodate variations. It`s not like
> reboring an engine cylinder.
>
> ...
> "
>
> Details and/or pointers to info. would be of interest.
>
> When I was a youth there was L.H.Sparry`s "The Amateur`s Lathe" and it
> did mention honing - but I never got anything like that far.
> If I recall the mention was copper and fine grinding paste.
>
> [I am used to using fine diamond paste on a felt nap to polish
> metallurgical cross-section samples to a mirror finish before
> micro-etching to reveal the internal structure]
>
> Point about hydraulics - need to be very smooth but seals can take up
> some out-of-round and slightly varying size is interesting point...
>
> Rich S
There are hones that theoretically can be adjusted to hone to a specific
size. I do not know how straight they hone over a long distances, but I
would assume they are only intended to grind a few tenths. I have one I
used to hone the bore on my KMB1 mill when I bought a new quill/spindle
that was tight in the bore. I had no access to a cylinder grinder which
I assumed would have been the correct way to size the quill.
I can`t imagine trying to remove more than a few tenths with one of
these adjustable hones, but it did resize the sleeve inside the head. I
think I wound up a tiny bit over sized in the end, but it worked well
enough. It didn`t result in out of spec parts for the machine. To be
fair the manuals for the machine says it should hold .003 or better, but
until I had mechanical failures in the ballscrews it tended to hold
about .001 over its length of travel as long as I kept parts cool.
Since the stones do wear away your mileage may vary. I just went slow
and checked fit as I went. I cleaned out all the grit and relubbed it a
dozen times probably before I was done.
--
Bob La Londe
CNC Molds N Stuff
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