Am I really going to need to allow for millionths of an inch ? I'm looking at an 81 piece set from Shars , a grade B with the deviation
table for under a hundred bucks . Looks like the biggest variance is
.000034" , or about a third of a ten thousandth . I can't see any
project that I might get needing that kind of precision ...
I'm considering buying the set just because I've kinda wanted some
and I think they'll get me closer to perfect in my upcoming depth mike project . Since they can trace back to a national standard I can also
use them to check all my other micrometers , none of which have been calibrated for at least 40 years , and in some cases longer than that .
"Snag" wrote in message news:v5keu4$2sp2r$1@dont-email.me...
Am I really going to need to allow for millionths of an inch ? I'm looking at an 81 piece set from Shars , a grade B with the deviation
table for under a hundred bucks . Looks like the biggest variance is
.000034" , or about a third of a ten thousandth . I can't see any
project that I might get needing that kind of precision ...
I'm considering buying the set just because I've kinda wanted some
and I think they'll get me closer to perfect in my upcoming depth mike project . Since they can trace back to a national standard I can also
use them to check all my other micrometers , none of which have been calibrated for at least 40 years , and in some cases longer than that .
On 6/27/2024 12:35 PM, Snag wrote:
Am I really going to need to allow for millionths of an inch ? I'm
looking at an 81 piece set from Shars , a grade B with the deviation
table for under a hundred bucks . Looks like the biggest variance is
.000034" , or about a third of a ten thousandth . I can't see any
project that I might get needing that kind of precision ...
I'm considering buying the set just because I've kinda wanted some
and I think they'll get me closer to perfect in my upcoming depth mike
project . Since they can trace back to a national standard I can also
use them to check all my other micrometers , none of which have been
calibrated for at least 40 years , and in some cases longer than that .
You will probably be fine. I hardly even use my gage blocks. I just
CNC machine an angle plate with a stop. I have a cheap B grade set, and
I miced them (I have Starret standards), and they are as good as I can measure except the 4 inch which for some reason is almost exactly 4.001
I have a set of gage pins too. Most of the time I just use my set of
drill blanks because its faster and most holes I'm checking are nominal standard sizes anyway. If they aren't I measure them with an inside mic.
On 6/27/2024 4:56 PM, Bob La Londe wrote:
On 6/27/2024 12:35 PM, Snag wrote:
Am I really going to need to allow for millionths of an inch ? I'm
looking at an 81 piece set from Shars , a grade B with the deviation
table for under a hundred bucks . Looks like the biggest variance is
.000034" , or about a third of a ten thousandth . I can't see any
project that I might get needing that kind of precision ...
I'm considering buying the set just because I've kinda wanted some
and I think they'll get me closer to perfect in my upcoming depth
mike project . Since they can trace back to a national standard I can
also use them to check all my other micrometers , none of which have
been calibrated for at least 40 years , and in some cases longer than
that .
You will probably be fine. I hardly even use my gage blocks. I just
CNC machine an angle plate with a stop. I have a cheap B grade set,
and I miced them (I have Starret standards), and they are as good as I
can measure except the 4 inch which for some reason is almost exactly
4.001
I have a set of gage pins too. Most of the time I just use my set of
drill blanks because its faster and most holes I'm checking are
nominal standard sizes anyway. If they aren't I measure them with an
inside mic.
I'll probably only use them for calibration checks . And only because
one of these days something I make is going to have to be a pretty
precise fit for something somebody else makes . Gauge pins are on my
wish list too . I got a set of thread wires a while back . Haven't used
them yet but then I haven't needed a precise thread fit . I have a
couple of projects in mind that will require a fairly precise thread ...
OBTW , I did order that set of Shars blocks . Under 110 bucks , and there's no doubt that if I waited I'd be paying more .
On 6/27/2024 4:56 PM, Snag wrote:
On 6/27/2024 4:56 PM, Bob La Londe wrote:
On 6/27/2024 12:35 PM, Snag wrote:
Am I really going to need to allow for millionths of an inch ?
I'm looking at an 81 piece set from Shars , a grade B with the
deviation table for under a hundred bucks . Looks like the biggest
variance is .000034" , or about a third of a ten thousandth . I
can't see any project that I might get needing that kind of
precision ...
I'm considering buying the set just because I've kinda wanted
some and I think they'll get me closer to perfect in my upcoming
depth mike project . Since they can trace back to a national
standard I can also use them to check all my other micrometers ,
none of which have been calibrated for at least 40 years , and in
some cases longer than that .
You will probably be fine. I hardly even use my gage blocks. I just
CNC machine an angle plate with a stop. I have a cheap B grade set,
and I miced them (I have Starret standards), and they are as good as
I can measure except the 4 inch which for some reason is almost
exactly 4.001
I have a set of gage pins too. Most of the time I just use my set of
drill blanks because its faster and most holes I'm checking are
nominal standard sizes anyway. If they aren't I measure them with an
inside mic.
I'll probably only use them for calibration checks . And only because
one of these days something I make is going to have to be a pretty
precise fit for something somebody else makes . Gauge pins are on my
wish list too . I got a set of thread wires a while back . Haven't
used them yet but then I haven't needed a precise thread fit . I have
a couple of projects in mind that will require a fairly precise thread
...
OBTW , I did order that set of Shars blocks . Under 110 bucks , and
there's no doubt that if I waited I'd be paying more .
Yes. Everything always goes up and lately very quickly. I've been bringing in some cash the last couple months, so I have been buying
things I need and stocking up on materials so I'll have it when things inevitably crash again.
"Snag" wrote in message news:v5kuvs$2vope$1@dont-email.me...
I could have done this without them , but I never let an opportunity
to buy tooling go to waste .
---------------------------
I rarely pass up on measuring equipment, especially second hand. And sometimes, years later, I really do need it, like a Mitutoyo 146-102
Groove Micrometer I got cheap from a seller who didn't know what it was,
and I needed a week or two ago. IIRC I was the only bidder on the gauge
block set with a couple of common sizes missing. MSC had them for ~$16
each, accurate to better than 10 microinches.
On 6/27/2024 5:59 PM, Jim Wilkins wrote:
"Snag" wrote in message news:v5kuvs$2vope$1@dont-email.me...
I could have done this without them , but I never let an opportunity
to buy tooling go to waste .
---------------------------
I rarely pass up on measuring equipment, especially second hand. And
sometimes, years later, I really do need it, like a Mitutoyo 146-102
Groove Micrometer I got cheap from a seller who didn't know what it
was, and I needed a week or two ago. IIRC I was the only bidder on the
gauge block set with a couple of common sizes missing. MSC had them
for ~$16 each, accurate to better than 10 microinches.
I have a Starrett can lid micrometer. Never know when I might need it.
I could wind up at Libbey chopping green beans and sealing lids. LOL.
"Snag" wrote in message news:v5kuvs$2vope$1@dont-email.me...
I could have done this without them , but I never let an opportunity
to buy tooling go to waste .
---------------------------
I rarely pass up on measuring equipment, especially second hand. And sometimes, years later, I really do need it, like a Mitutoyo 146-102
Groove Micrometer I got cheap from a seller who didn't know what it was,
and I needed a week or two ago. IIRC I was the only bidder on the gauge
block set with a couple of common sizes missing. MSC had them for ~$16
each, accurate to better than 10 microinches.
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