How much should be side to side play in mill quill?
 

I am shopping for a larger mill and found a Lagun FTV-4 for sale. It looks fine but it
has some side to side quill play.
If held the 1" bar stock hanging out of the collet and pulled on it while leaning back
with my full body weight (175), I got a little less than .001 deflection...if I really
yanked hard with an all out inertial type yank using my body weight it looked like it
moved almost .OO2.

Is it normal or excessive?

How much should be side to side play in mill quill?
 

On Sep 13, 2:51 pm, Alex wrote:
I am shopping for a larger mill and found a Lagun FTV-4 for sale. It looks fine but it
has some side to side quill play.
If held the 1" bar stock hanging out of the collet and pulled on it while leaning back
with my full body weight (175), I got a little less than .001 deflection...if I really
yanked hard with an all out inertial type yank using my body weight it looked like it
moved almost .OO2.

Is it normal or excessive?

Indicator on head or on table? If it's on the table, you're measuring
flex in the column through the head. If on the head, just spindle/
quill/collet play and bar deflecytion. Either way, not too bad.

John Martin

How much should be side to side play in mill quill?
 

John Martin wrote:
On Sep 13, 2:51 pm, Alex wrote:
I am shopping for a larger mill and found a Lagun FTV-4 for sale. It looks fine but it
has some side to side quill play.
If held the 1" bar stock hanging out of the collet and pulled on it while leaning back
with my full body weight (175), I got a little less than .001 deflection...if I really
yanked hard with an all out inertial type yank using my body weight it looked like it
moved almost .OO2.

Is it normal or excessive?

Indicator on head or on table? If it's on the table, you're measuring
flex in the column through the head. If on the head, just spindle/
quill/collet play and bar deflecytion. Either way, not too bad.

John Martin

Here is the picture on the measuring set up.
a href="http://photobucket.com" target="_blank"img
src="http://i83.photobucket.com/albums/j305/alexkuzn/mill7.jpg" border="0" alt="Photo
Sharing and Video Hosting at Photobucket"/a

How much should be side to side play in mill quill?
 

John Martin wrote:
On Sep 13, 2:51 pm, Alex wrote:
I am shopping for a larger mill and found a Lagun FTV-4 for sale. It looks fine but it
has some side to side quill play.
If held the 1" bar stock hanging out of the collet and pulled on it while leaning back
with my full body weight (175), I got a little less than .001 deflection...if I really
yanked hard with an all out inertial type yank using my body weight it looked like it
moved almost .OO2.

Is it normal or excessive?

Indicator on head or on table? If it's on the table, you're measuring
flex in the column through the head. If on the head, just spindle/
quill/collet play and bar deflecytion. Either way, not too bad.

John Martin

Try this link to see the picture
http://s83.photobucket.com/albums/j3...rent=mill7.jpg

How much should be side to side play in mill quill?
 

On Sep 13, 3:07 pm, Alex wrote:
...
The runout means you can't bore a perfectly cylindrical hole using the
quill feed but you may be able to by locking the quill and raising the
table, which is what I have to do. Used machines require a little
understanding, no big deal. How is the runout with the quill
retracted?

jw

How much should be side to side play in mill quill?
 

"Jim Wilkins" wrote in message
ups.com...
On Sep 13, 3:07 pm, Alex wrote:
...
The runout means you can't bore a perfectly cylindrical hole using the
quill feed but you may be able to by locking the quill and raising the
table, which is what I have to do. Used machines require a little
understanding, no big deal. How is the runout with the quill
retracted?

jw


Do not confuse runout with deflection. That a quill moves under a given
load doesn't mean it won't run a circle. Running a true circle relates to
the bearings, not the quill fit.

Harold

How much should be side to side play in mill quill?
 

On Sep 13, 4:00 pm, "Harold and Susan Vordos" wrote:
"Jim Wilkins" wrote in message

ups.com...

On Sep 13, 3:07 pm, Alex wrote:
...
The runout means you can't bore a perfectly cylindrical hole using the
quill feed but you may be able to by locking the quill and raising the
table, which is what I have to do. Used machines require a little
understanding, no big deal. How is the runout with the quill
retracted?

jw

Do not confuse runout with deflection. That a quill moves under a given
load doesn't mean it won't run a circle. Running a true circle relates to
the bearings, not the quill fit.

Harold

On my 50-year-old mill the lateral deflection increases as the quill
extends and its upper and lower supports approach each other. The
clamp can remove play from only the lower support.

When I bore a hole with the quill feed the hole tapers slightly inward
with depth as the quill deflects away from the cut, and a shaft that
fits the mouth of the bore jams a short ways down. If I bore with the
quill retracted and tightly clamped, by raising the knee, the shaft
fits equally all the way down.

The taper is probably no more than 0.001" / 1" but I wanted that
hydraulic gear pump bearing to fit as well as I could get it.

jw

How much should be side to side play in mill quill?
 

On Thu, 13 Sep 2007 18:51:05 GMT, Alex wrote:

I am shopping for a larger mill and found a Lagun FTV-4 for sale. It looks fine but it
has some side to side quill play.
If held the 1" bar stock hanging out of the collet and pulled on it while leaning back
with my full body weight (175), I got a little less than .001 deflection...if I really
yanked hard with an all out inertial type yank using my body weight it looked like it
moved almost .OO2.

Is it normal or excessive?

That actually sounds pretty good.

Gunner

How much should be side to side play in mill quill?
 

On Thu, 13 Sep 2007 12:07:40 -0700, Alex wrote:

John Martin wrote:
On Sep 13, 2:51 pm, Alex wrote:
I am shopping for a larger mill and found a Lagun FTV-4 for sale. It looks fine but it
has some side to side quill play.
If held the 1" bar stock hanging out of the collet and pulled on it while leaning back
with my full body weight (175), I got a little less than .001 deflection...if I really
yanked hard with an all out inertial type yank using my body weight it looked like it
moved almost .OO2.

Is it normal or excessive?

Indicator on head or on table? If it's on the table, you're measuring
flex in the column through the head. If on the head, just spindle/
quill/collet play and bar deflecytion. Either way, not too bad.

John Martin

Try this link to see the picture
http://s83.photobucket.com/albums/j3...rent=mill7.jpg


You got .002 by yanking hard on that setup?

The mill is just fine.

Gunner

How much should be side to side play in mill quill?
 

Alex wrote:
... pulled on it while leaning back with my full body weight .....if
I really yanked hard with an all out inertial type yank ...

You're checking for flex in the structure. Checking for side play only
requires a moderate touch.

Bob