J
JDR
Guest
Boy! I sure got some good advice and replys on this one I sure thank you gents very much jerry
S
short300
Guest
Probably too obvious
or flawed, to have merit, but could anything positive be accomplished by setting up a reamer in a centered barrel or stub, indicating the movement of the reamer (vertical and lateral) near the TS center, while turning the HS and keeping a tiny amount of quill pressure (enought to keep the TS and reamer fully engaged)? I think a large (ie .002") variation could be attributed to TS offset, but maybe not the smaller (<.0005") change. The quill wear/movement would probably result in some, maybe all of this, esp. in an older lathe. Ron.
or flawed, to have merit, but could anything positive be accomplished by setting up a reamer in a centered barrel or stub, indicating the movement of the reamer (vertical and lateral) near the TS center, while turning the HS and keeping a tiny amount of quill pressure (enought to keep the TS and reamer fully engaged)? I think a large (ie .002") variation could be attributed to TS offset, but maybe not the smaller (<.0005") change. The quill wear/movement would probably result in some, maybe all of this, esp. in an older lathe. Ron.
M
Mike Swartz
Guest
Don't be afraid to put the level on a lathe especially if it's on a new floor. Some floors need to be more substantial than they are when it comes to supporting any machine tools. The majority of garage or basement floors are not poured with supporting machines in mind. Any adjusting on a lathe is a waste of time if it isn't level.
Mike Swartz
Mike Swartz
R
robdaniel
Guest
Calling Don and Jackie
Maybe we can get Jackie Schmidt or Don Neilson to chime in. I work with lathes all day long and I don't think I have ever seen a lathe that had the tailstock on center--on center through the entire range of travel on the ways and through the entire spindle travel of the tailstock. I think someone made a video once touting the need for the tailstock to be centered exactly. I don't think it happens.
Maybe we can get Jackie Schmidt or Don Neilson to chime in. I work with lathes all day long and I don't think I have ever seen a lathe that had the tailstock on center--on center through the entire range of travel on the ways and through the entire spindle travel of the tailstock. I think someone made a video once touting the need for the tailstock to be centered exactly. I don't think it happens.
P
PPP MMM
Guest
The level
is an absolute must. Many years ago when I've worked for ten years as an engineering technician on lathes complete overhauls we deliberately used to grind the bottom absolutly flat and bore the front part of the tailstock spindle hole 0.003mm lover at the front, than the rear. I knew the exact reason for it than, but I don't remember everything for ever.
Shoot well
Peter
is an absolute must. Many years ago when I've worked for ten years as an engineering technician on lathes complete overhauls we deliberately used to grind the bottom absolutly flat and bore the front part of the tailstock spindle hole 0.003mm lover at the front, than the rear. I knew the exact reason for it than, but I don't remember everything for ever.
Shoot well
Peter
T
tasy_ted
Guest
tailstock zero
the best way to get your tailstock in line is to put in the best dead centre
that you can buy in the tailstock .and then place the dial ind in the chuck
( on a spigot ) and run it around the taper on the centre and adjust left and
right until zero then attach a tention wrench and pull down the tailstock
untill you have zero up down and left and right or as close as posible.
that is if your quill is true and parallel with the bed .
i had to split my tailstock and have it ground then i packed it up with shimes
so that at 60 ft pounds it reads zero all around my dead centre and it
is repeatable. hope this helps.
regards tasy_ted
the best way to get your tailstock in line is to put in the best dead centre
that you can buy in the tailstock .and then place the dial ind in the chuck
( on a spigot ) and run it around the taper on the centre and adjust left and
right until zero then attach a tention wrench and pull down the tailstock
untill you have zero up down and left and right or as close as posible.
that is if your quill is true and parallel with the bed .
i had to split my tailstock and have it ground then i packed it up with shimes
so that at 60 ft pounds it reads zero all around my dead centre and it
is repeatable. hope this helps.
regards tasy_ted
Butch Lambert
Active member
Your tailstock might measure true at one point, but what about as you move it on the ways and what happens as you extend the ram?
Butch
Butch
R
robdaniel
Guest
Butch, have you ever seen a tailstock that was "on center" all along the bed and throughout the spindle travel? Jackie works with bigger lathes and Don Nielson works with smaller lathes and I wonder if they have ever seen this elusive "on center" tailstock.
P
PPP MMM
Guest
To complete the story
we had permited 0.005mm/500mm tolerance from one end of the extended spindle to the other at any given position of the main bed. We used to take the measurements off 40mm diameter 500mm long precisely grinded rod made of hardenned dimension stable tool steel to precisely fit the taper in the spindle. But than everything was regrinded as if new.
Shoot well
Peter
,,,,,,,,,,,,,,,,,,,,
we had permited 0.005mm/500mm tolerance from one end of the extended spindle to the other at any given position of the main bed. We used to take the measurements off 40mm diameter 500mm long precisely grinded rod made of hardenned dimension stable tool steel to precisely fit the taper in the spindle. But than everything was regrinded as if new.
Shoot well
Peter
In one of my lathe classes years ago, the instructor would move the tail stock one way or another on every lathe in the shop before class. The first thing we had to do in every shop session was re-center the tailstock. If you started work without checking it, you cut lots of tapers. I made a precision test bar as a project in one of the grinding classes for my use on my lathe at home. Funny how my home lathe is never out when I check it without that instructor around.
T
tasy_ted
Guest
hi butch
when i am chambering through the head stock the tailstock
is usualy in the same spot the one that i clocked it up in .
i also clocked the ram and have that running level. on my big lathe
i had to send back the tailstock ram to have the centre reground
as it was off centre .when i had the base ground level and leveled
on my small lathe it has 2 screws on the back ( hand wheel side to
let you level left and right so you can get the quill running parrell with the bed
its only as good as the time you take to set it up.
regards tasy_ted