Most of the hobbyist I know don't turn between centers ,
it's always a 3 jaw & live center . When I mention dogs &
faceplates most folks I know say that stuff is for wood lathes .
( yea , silly rabbit , trix is for kids ) I know the difference
between a surface grinder & tool post grinder . I've seen
guys grind centers on a surface grinder with a spin indexer .
Maybe I'm wrong but I can find a lot more uses for a surface
grinder then a tool post grinder . The reason I have a tool post
grinder is cause I found one in a junk pile left at a friends
house that was tossed by the previous owner who was a machinist .
It's under my bench earning interest as trading stock . Seems
bout everyone that gets a lathe seems to think he / her has to
have a tool post grinder . I know more people with surface
grinders than tool post grinders . For the parts we make as
hobbyist I think a tool post grinder is something that will sit on
the shelf for years for most folks . If I really need to freshen
up a center I can do it on my lathe with a cutter or take over to
a bud's house that has a surface grinder ,or Amazon will have a
new one at my bench in 2-3 days .
YMMV
animal
On 7/30/2022 8:16 PM, Bill in OKC too
via groups.io wrote:
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Show quoted text
They do very different
things. Morse taper accessories, for example, including
centers, are best finished with a tool post grinder, where a
surface grinder is best for things like 1-2-3 blocks, gibs
for machine ways, etc. they both give very fine precision
surfaces, but the tool post grinder does cylindrical and
tapered round objects, where the surface grinder does flats.
If you're making a bunch of tooling from scratch, you
probably need both. If you mainly do lathe work, you
probably need a tool post grinder, while mostly flat stuff
like 1-2-3 blocks, angle blocks, v-blocks, squares and that
sort of thing, a surface grinder is what you need. And what
you need is dependent on what you're doing. I'm ambitious to
be able to make things most folks would just buy.
One very common use for a
tool post grinder is for truing centers for between-centers
work on the lathe to get the absolute best accuracy and
concentricity.
Despite the fact that I
took a professional course in machining, they did not teach
turning between centers, nor use of a tool post grinder. Frankly, I felt
cheated, but I did read all about it in some of the old
books on machining on the lathe, so I at least know some
of the theory.
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
Aphorisms
to live by:
Good judgement comes from experience.
Experience comes from bad judgement.
SEMPER GUMBY!
Improvise,
Adapt, and Overcome.
Physics
doesn't care about your schedule.
The
only reason I know anything is because I've done
it wrong enough times to START to know better
On Saturday, July 30, 2022 at 07:56:19 PM CDT, mike
allen <animal@...> wrote:
I have a tool post grinder an Atlas , which I
have never used as of yet . I could see a surface
grinder coming in handy a lot more than the tool post
grinder . But I could just be pounding sand
with that statement . For folks with either
grinder which do you use more often & for what job
?
thanks
animal
On
7/30/2022 3:16 PM, Bill in OKC too via groups.io
wrote:
I knew I wasn't going to be able to
afford one for my hobby shop, but was interested
in how badly I couldn't afford it. Found a place
that lists the SuperJet-S kit for oxy-acetylene
deposition for only about $3300, which was
actually a lot better than I expected, though
still way out of my range! ;)
My Lewis shaper countershaft system
had been "repaired" with braze, and apparently new
bearings at some point in its life. The installed
bearings when I got it were metric, which I didn't
figure out until after I'd made a 5/8" shaft for
it, a couple of times. This was back when I was
having to do at least two or three tries to get a
project right, at a minimum. First one, I used a
chunk of mystery metal, and found that there was a
kink in it. It turned properly, but there was a
curve in the narrowest portion of the shaft. Roll
it across a surface plate, and it would make
exactly one revolution before stopping. I
neglected to check that it fit the bearings until
after I had the 2nd try complete. Nope, too small.
The bearing ID was 15.98mm or 0.629", so 0.004"
too large for the shaft. My 3rd try is closer, but
I still goofed it up enough that I'll need to put
Loctite on the shaft...
One of these systems would be perfect
for making the 2nd or 3rd try work after all! :)
One of these days, I want to have a
surface grinder, and a toolpost grinder, in
addition to the lathes. That day is not today,
however!
Hi! My name is Bill, and I'm a
toolohaulic! I don't want much, just at least one
of each of every took ever made, and a large
enough shop to be able to keep everything
organized. Better I not hold my breath waiting for
that! :)
Bill in OKC
William
R. Meyers, MSgt, USAF(Ret.)
Aphorisms to live by:
Good judgement comes from
experience. Experience comes from bad
judgement.
SEMPER GUMBY!
Improvise, Adapt, and
Overcome.
Physics doesn't care about
your schedule.
The only reason I know
anything is because I've done it wrong
enough times to START to know better
On Saturday, July 30, 2022 at 03:28:27 PM CDT,
Ray De Jong via groups.io <dejongray@...>
wrote:
Its been around for a while;
in 1970something I bought one (Eutectic
Castolin) for the shop i had at the time
and with quite an array of different
powdered metals. it became a very good
money-maker and saved a number of
expensive parts from the scrap heep. The
parent material being a shaft, wear
surface or other is prepared with a very
rough surface so the spray weld will
'stick' better then the part is preheated
, depending on the parent metal ie.
tubman-bronze, stainless, etc.
then the spayweld is applied
by use of the special torchwith the
attached powded metal hopper. After which
the finish is performed. On a wear surface
I usually used a shaper or mill, or both.
On pump shafts for example, the lathe and
often tool post grinder were the choice.
Anyway that was my experience
"oxy/acetylene spray welding"?
That's a new one on me. But sounds
intriguing.
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