Where do shaft sizes like 0.1545" come from? There's a few small diameter >ones like this that don't match any fraction I'be come across.
Where do shaft sizes like 0.1545" come from? There's a few small diameter >ones like this that don't match any fraction I'be come across.
"Clare Snyder" wrote in message news:lesqhg5mq2ts3i4gd5bdkeerhua25i8jj0@4ax.com...
On Wed, 18 Aug 2021 20:35:17 -0000 (UTC), Cydrome Leader <presence@MUNGEpanix.com> wrote:
Where do shaft sizes like 0.1545" come from? There's a few small diameter >>ones like this that don't match any fraction I'be come across.About as close to 4mm as Damn is to swearing.
---------------------
It's even closer to 5/32". Maybe the shaft was meant to be a running fit in a reamed hole? It's easier to make a custom OD than a small custom ID,
though I've found second-hand reamers 0.001" over and under standard fractional size.
Where do shaft sizes like 0.1545" come from? There's a few small diameter ones like this that don't match any fraction I'be come across.
Where do shaft sizes like 0.1545" come from? There's a few small diameter ones like this that don't match any fraction I'be come across.
"Clare Snyder" wrote in message news:lesqhg5mq2ts3i4gd5bdkeerhua25i8jj0@4ax.com...
On Wed, 18 Aug 2021 20:35:17 -0000 (UTC), Cydrome Leader <presence@MUNGEpanix.com> wrote:
Where do shaft sizes like 0.1545" come from? There's a few small diameter >>ones like this that don't match any fraction I'be come across.About as close to 4mm as Damn is to swearing.
---------------------
It's even closer to 5/32". Maybe the shaft was meant to be a running fit
in
a reamed hole? It's easier to make a custom OD than a small custom ID,
though I've found second-hand reamers 0.001" over and under standard fractional size.
Where do shaft sizes like 0.1545" come from? There's a few small diameter ones like this that don't match any fraction I'be come across.
On 8/18/2021 1:35 PM, Cydrome Leader wrote:
Where do shaft sizes like 0.1545" come from? There's a few small diameter
ones like this that don't match any fraction I'be come across.
I guess the first question would have to be is it really a "precision"
shaft or just a piece of round bar? Even if it is precision shaft what
are the tolerances of manufacture. Look at the notes on most any
size/shape stock on the McMaster Carr website to see what I mean.
Sometimes its right up on top, and sometimes you have to click on the individual product information link.
The next question is how much does the exact size matter?
On 8/18/2021 1:35 PM, Cydrome Leader wrote:Sometimes the shaft is unsersized to provide clearance in a
Where do shaft sizes like 0.1545" come from? There's a few small diameter
ones like this that don't match any fraction I'be come across.
I guess the first question would have to be is it really a "precision"
shaft or just a piece of round bar? Even if it is precision shaft what
are the tolerances of manufacture. Look at the notes on most any
size/shape stock on the McMaster Carr website to see what I mean.
Sometimes its right up on top, and sometimes you have to click on the >individual product information link.
The next question is how much does the exact size matter?
"Cydrome Leader" wrote in message news:sfopag$24h$1@reader1.panix.com...
It's precision and common on small motors shafts. They make matching
radial bearings and reamers for this size. I just can't figure out where these bizarre sizes originated.
--------------
Motor manufacturers' catalogs might tell you.
Jim Wilkins <muratlanne@gmail.com> wrote:
"Cydrome Leader" wrote in message news:sfopag$24h$1@reader1.panix.com...Dear lord you fuckers are dense and out of touch.
It's precision and common on small motors shafts. They make matching
radial bearings and reamers for this size. I just can't figure out where
these bizarre sizes originated.
--------------
Motor manufacturers' catalogs might tell you.
There is no story about where this or 0.2175" shafts come from in
catalogs, and they are extremely common items.
On 20/08/2021 22:59, Cydrome Leader wrote:
Jim Wilkins <murat...@gmail.com> wrote:
"Cydrome Leader" wrote in message news:sfopag$24h$1...@reader1.panix.com...Dear lord you fuckers are dense and out of touch.
It's precision and common on small motors shafts. They make matching
radial bearings and reamers for this size. I just can't figure out where >> these bizarre sizes originated.
--------------
Motor manufacturers' catalogs might tell you.
There is no story about where this or 0.2175" shafts come from in
catalogs, and they are extremely common items.
Because of how close the sizes are to fraction inch sizes, 0.2175" being
near 7/32", I wonder if the dimensions pre-date the common tolerance
system we use today and the bush bores were made to the fractional inch
size and the shaft suitably undersized to give the needed running
clearance. The fact that the sizes are still in use today may just be a legacy thing to maintain compatibility like happens in so many other fields.
The hardware store inch-size washers I buy come in a range of almost random thicknesses, which helps when I need a shim. I suppose they were punched
from whatever sheet stock was available cheaply, perhaps because it was out of spec.
On Thursday, August 19, 2021 at 5:35:51 AM UTC-7, Jim Wilkins wrote:
The hardware store inch-size washers I buy come in a range of almost random >> thicknesses, which helps when I need a shim. I suppose they were punched
from whatever sheet stock was available cheaply, perhaps because it was out >> of spec.
That's not unlikely; a job shop doing stampings will frequently have leftover parts of whole sheets of material, and can make a bit more money by punching out washers than from recycling the remainder as scrap for remelting.
On 20/08/2021 22:59, Cydrome Leader wrote:
Jim Wilkins <muratlanne@gmail.com> wrote:Because of how close the sizes are to fraction inch sizes, 0.2175" being
"Cydrome Leader"Â wrote in messageDear lord you fuckers are dense and out of touch.
news:sfopag$24h$1@reader1.panix.com...
It's precision and common on small motors shafts. They make matching
radial bearings and reamers for this size. I just can't figure out where >>> these bizarre sizes originated.
--------------
Motor manufacturers' catalogs might tell you.
There is no story about where this or 0.2175" shafts come from in
catalogs, and they are extremely common items.
near 7/32", I wonder if the dimensions pre-date the common tolerance
system we use today and the bush bores were made to the fractional inch
size and the shaft suitably undersized to give the needed running clearance. The fact that the sizes are still in use today may just be a legacy thing to maintain compatibility like happens in so many other
fields.
On 8/20/2021 4:15 PM, David Billington wrote:
On 20/08/2021 22:59, Cydrome Leader wrote:
Jim Wilkins <muratlanne@gmail.com> wrote:
"Cydrome Leader" wrote in message
news:sfopag$24h$1@reader1.panix.com...
It's precision and common on small motors shafts. They make matching
radial bearings and reamers for this size. I just can't figure out where >>>> these bizarre sizes originated.
Because of how close the sizes are to fraction inch sizes, 0.2175" beingMotor manufacturers' catalogs might tell you.Dear lord you fuckers are dense and out of touch.
There is no story about where this or 0.2175" shafts come from in
catalogs, and they are extremely common items.
near 7/32", I wonder if the dimensions pre-date the common tolerance
system we use today and the bush bores were made to the fractional inch
size and the shaft suitably undersized to give the needed running
clearance. The fact that the sizes are still in use today may just be a
legacy thing to maintain compatibility like happens in so many other
fields.
I'm just a dense fucker, so I'll reserve any further speculation.
Where do shaft sizes like 0.1545" come from? There's a few small diameter >ones like this that don't match any fraction I'be come across.
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