Hi All,

The 40-taper on my big mill is sticking and I have to beat the top of
the power draw bar with a hammer to make it release. I am sure it is
not doing the power draw bar any good. It has been like this for
months. Not getting any better, not getting any worse.

I have tried cleaning it out with brake cleaner.

I have tried oiling it.

I have tried wd40.

Any suggestion please????

Dave

"Dave, I can't do that" wrote in message
...
Hi All,

The 40-taper on my big mill is sticking and I have to beat the top of
the power draw bar with a hammer to make it release. I am sure it is
not doing the power draw bar any good. It has been like this for
months. Not getting any better, not getting any worse.

I have tried cleaning it out with brake cleaner.

I have tried oiling it.

I have tried wd40.

Any suggestion please????


http://www.google.com/search?q=Sta-L...=shop%3A1&aq=f

On Mon, 14 Feb 2011 12:33:33 -0800 (PST), "Dave, I can't do that"
wrote:

Hi All,

The 40-taper on my big mill is sticking and I have to beat the top of
the power draw bar with a hammer to make it release. I am sure it is
not doing the power draw bar any good. It has been like this for
months. Not getting any better, not getting any worse.

I have tried cleaning it out with brake cleaner.

I have tried oiling it.

I have tried wd40.

Any suggestion please????

Dave

The NMTB40 tools stick in my manual mill too. You're hitting in the
wrong spot. At least for mine, a light wrap sideways on the tool
itself knocks it right loose after running the power drawbar for a
second to have the bolt pushing down. Let me know if the spray Sam
recommended works. I'm just used to it, been that way for years. The
same tooling doesn't stick in my CNC mill.

On Feb 14, 2:11*pm, "PrecisionmachinisT"
wrote:

Thanks, looks like it is worth a try.

I notice the next best option in that search is "Sex lube," Hmmmm. LOL

Dave

Oh, and it is not just any particular 40-taper. It is all and any of
them. Ranging from the $30 cheapies up to the $200 collet lock.

Dave

On 2011-02-14, Karl Townsend wrote:
On Mon, 14 Feb 2011 12:33:33 -0800 (PST), "Dave, I can't do that"
wrote:

Hi All,

The 40-taper on my big mill is sticking and I have to beat the top of
the power draw bar with a hammer to make it release. I am sure it is
not doing the power draw bar any good. It has been like this for
months. Not getting any better, not getting any worse.

I have tried cleaning it out with brake cleaner.

I have tried oiling it.

I have tried wd40.

Any suggestion please????

Dave

The NMTB40 tools stick in my manual mill too. You're hitting in the
wrong spot. At least for mine, a light wrap sideways on the tool
itself knocks it right loose after running the power drawbar for a
second to have the bolt pushing down. Let me know if the spray Sam
recommended works. I'm just used to it, been that way for years. The
same tooling doesn't stick in my CNC mill.

QC-30 toolholders stick in my mill too. I just whack them sideways
with a small brass hammer.

i

Dave, I can't do that wrote:
Hi All,

The 40-taper on my big mill is sticking and I have to beat the top of
the power draw bar with a hammer to make it release. I am sure it is
not doing the power draw bar any good. It has been like this for
months. Not getting any better, not getting any worse.

I have tried cleaning it out with brake cleaner.

I have tried oiling it.

I have tried wd40.

Any suggestion please????

Dave


put a chalk mark along the tooling and see where it is touching and not
touching. Usually if the tool is not releasing something is bent or
warped and you are getting a springing action that is holding the tool
tight. If it is all the tools then the spindle taper is screwed up.
Never tried it but some lapping compound on one of the tools and with
the drive dogs removed lap the inside of the taper. I would also check
the runout of the spindle itself.

John

Ignoramus14196 wrote:
... I just whack them sideways
with a small brass hammer.

Be careful with that brass. I once had to drive out a lathe spindle &
used a brass hammer. It _deformed_ the end of the spindle (which
fortunately did not affect its functioning). The thing with brass is
that it work hardens.

I now use only a lead hammer on machinery. I made one using Linotype
lead, which is much harder than plumbing or flashing lead, but much
softer than brass.

Bob

Thanks guys,

I have never had a crash with this machine so I doubt it is a spindle
damage issue. It used to work fine and I can't recall anything
changing back when it started.

Just after this started, I used bearing blue to test the fit and it
showed as damn near perfect. I thought there may be a ding in the
spindle or something, but nothing showed up.

I have a copper mallet I can try hitting sideways although I am not
nuts about shock loading the bearings. I guess some gentle taps and
see if it drops out as the power draw bar is applying pressure and the
draw bar is still engaged by about 5 threads when it does drop down.

Dave

On Mon, 14 Feb 2011 12:33:33 -0800 (PST), "Dave, I can't do
that" wrote:

Hi All,

The 40-taper on my big mill is sticking and I have to beat the top of
the power draw bar with a hammer to make it release. I am sure it is
not doing the power draw bar any good. It has been like this for
months. Not getting any better, not getting any worse.

I have tried cleaning it out with brake cleaner.

I have tried oiling it.

I have tried wd40.

Any suggestion please????

Dave
================
I have not tried this myself, but there have been posts in
other newsgroups that a light coating of lipstick on the
holder will help. This could have been a leg pull, but
cheap to try.

Let the group know what you find out.



-- Unka George (George McDuffee)
...............................
The past is a foreign country;
they do things differently there.
L. P. Hartley (1895-1972), British author.
The Go-Between, Prologue (1953).

On Feb 15, 1:16*pm, F. George McDuffee gmcduf...@mcduffee-
associates.us wrote:

a light coating of lipstick on the holder will help.

Any particular color George?

I tried the SO's Strawberry Blush, but other than being barred from
touching her stuff again without asking, nothing happened.

Dave