| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
| Users: | 43 |
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| Calls: | 290 |
| Files: | 904 |
| Messages: | 76,426 |
I got the back plate finished for the 3 inch chuck and I'm a bit disappointed at my initial testing results . I've measured .015 runout
on a piece of 1/2 inch stock that I'm pretty sure is straight . Might be
the jaws since the chuck body indicates about .004 near the face . These
are the inside step jaws and the clamping surface is not very long so
that may be part of it . I'll be installing the outside step jaws
tomorrow and checking them - it came with 2 sets of those , one which
matches the chuck s/n and one that doesn't . The inside step set I have installed do not match numbers ... aaahhh , what should I expect for a
$10 yard sale purchase !
Actually , it may be as simple as regrinding the mismatched jaw sets
to match this chuck . I have a little time to play with it , got no
"other people's projects" in the shop right now .
On 9/20/2024 5:51 PM, Snag wrote:
I got the back plate finished for the 3 inch chuck and I'm a bit
disappointed at my initial testing results . I've measured .015 runout
on a piece of 1/2 inch stock that I'm pretty sure is straight . Might
be the jaws since the chuck body indicates about .004 near the face .
These are the inside step jaws and the clamping surface is not very
long so that may be part of it . I'll be installing the outside step
jaws tomorrow and checking them - it came with 2 sets of those , one
which matches the chuck s/n and one that doesn't . The inside step set
I have installed do not match numbers ... aaahhh , what should I
expect for a $10 yard sale purchase !
Actually , it may be as simple as regrinding the mismatched jaw
sets to match this chuck . I have a little time to play with it , got
no "other people's projects" in the shop right now .
Further testing having been completed the chuck has runout with all 3 sets of jaws of around .007" . Chuck body is more like .002-.003 . A
known straight 1/2" rod is not pointing straight with the ways ...
looks like it's time to set up the toolpost grinder .
So it looks like maybe a cheap chuck , though well made . Fit and
finish are good , everything fits as it should and the scroll moves
smoothly with all 3 pinions . Which brings me to a question - since
there's more than one pinion is it going to make any difference which
one I use ? Do I need to give 'em all 3 a twist when I mount a piece of
stock ?
On 9/20/2024 5:51 PM, Snag wrote:
I got the back plate finished for the 3 inch chuck and I'm a bit
disappointed at my initial testing results . I've measured .015
runout on a piece of 1/2 inch stock that I'm pretty sure is straight
. Might be the jaws since the chuck body indicates about .004 near
the face . These are the inside step jaws and the clamping surface is
not very long so that may be part of it . I'll be installing the
outside step jaws tomorrow and checking them - it came with 2 sets of
those , one which matches the chuck s/n and one that doesn't . The
inside step set I have installed do not match numbers ... aaahhh ,
what should I expect for a $10 yard sale purchase !
Actually , it may be as simple as regrinding the mismatched jaw
sets to match this chuck . I have a little time to play with it , got
no "other people's projects" in the shop right now .
Further testing having been completed the chuck has runout with all
3 sets of jaws of around .007" . Chuck body is more like .002-.003 . A
known straight 1/2" rod is not pointing straight with the ways ...
looks like it's time to set up the toolpost grinder .
So it looks like maybe a cheap chuck , though well made . Fit and
finish are good , everything fits as it should and the scroll moves
smoothly with all 3 pinions . Which brings me to a question - since
there's more than one pinion is it going to make any difference which
one I use ? Do I need to give 'em all 3 a twist when I mount a piece
of stock ?
On 21/09/2024 20:06, Snag wrote:
On 9/20/2024 5:51 PM, Snag wrote:
I got the back plate finished for the 3 inch chuck and I'm a bit
disappointed at my initial testing results . I've measured .015
runout on a piece of 1/2 inch stock that I'm pretty sure is straight
. Might be the jaws since the chuck body indicates about .004 near
the face . These are the inside step jaws and the clamping surface is
not very long so that may be part of it . I'll be installing the
outside step jaws tomorrow and checking them - it came with 2 sets of
those , one which matches the chuck s/n and one that doesn't . The
inside step set I have installed do not match numbers ... aaahhh ,
what should I expect for a $10 yard sale purchase !
Actually , it may be as simple as regrinding the mismatched jaw
sets to match this chuck . I have a little time to play with it , got
no "other people's projects" in the shop right now .
Further testing having been completed the chuck has runout with all
3 sets of jaws of around .007" . Chuck body is more like .002-.003 . A
known straight 1/2" rod is not pointing straight with the ways ...
looks like it's time to set up the toolpost grinder .
So it looks like maybe a cheap chuck , though well made . Fit and
finish are good , everything fits as it should and the scroll moves
smoothly with all 3 pinions . Which brings me to a question - since
there's more than one pinion is it going to make any difference which
one I use ? Do I need to give 'em all 3 a twist when I mount a piece
of stock ?
Does it have a pinion with a 0 next it? All my 3 jaw self centring
chucks have one and is supposed to be the pinion which result in the
minimum runout.
On 9/21/2024 12:06 PM, Snag wrote:
On 9/20/2024 5:51 PM, Snag wrote:
I got the back plate finished for the 3 inch chuck and I'm a bit
disappointed at my initial testing results . I've measured .015
runout on a piece of 1/2 inch stock that I'm pretty sure is straight
. Might be the jaws since the chuck body indicates about .004 near
the face . These are the inside step jaws and the clamping surface is
not very long so that may be part of it . I'll be installing the
outside step jaws tomorrow and checking them - it came with 2 sets of
those , one which matches the chuck s/n and one that doesn't . The
inside step set I have installed do not match numbers ... aaahhh ,
what should I expect for a $10 yard sale purchase !
Actually , it may be as simple as regrinding the mismatched jaw
sets to match this chuck . I have a little time to play with it , got
no "other people's projects" in the shop right now .
Further testing having been completed the chuck has runout with all
3 sets of jaws of around .007" . Chuck body is more like .002-.003 . A
known straight 1/2" rod is not pointing straight with the ways ...
looks like it's time to set up the toolpost grinder .
So it looks like maybe a cheap chuck , though well made . Fit and
finish are good , everything fits as it should and the scroll moves
smoothly with all 3 pinions . Which brings me to a question - since
there's more than one pinion is it going to make any difference which
one I use ? Do I need to give 'em all 3 a twist when I mount a piece
of stock ?
Does a known straight rod point straight and parallel if is directly in
a collet that fits in the native spindle bore? If not then level
(untwist) your lathe before doing anything else.
"Snag" wrote in message news:vcn5gc$1n35p$1@dont-email.me...
Further testing having been completed the chuck has runout with all 3 sets of jaws of around .007" . Chuck body is more like .002-.003 . A
known straight 1/2" rod is not pointing straight with the ways ...
looks like it's time to set up the toolpost grinder .
So it looks like maybe a cheap chuck , though well made . Fit and
finish are good , everything fits as it should and the scroll moves
smoothly with all 3 pinions . Which brings me to a question - since
there's more than one pinion is it going to make any difference which
one I use ? Do I need to give 'em all 3 a twist when I mount a piece of
stock ?