Hi Todd and others;
Indeed it is a horrible idea but I feel backed to the wall.
I have T lugs but they are secured by M6 shcs which is no where close to
as strong as the normal retention stud. However, I plan to use the
machine at full rpm with AlCrN coated end mill,
coolant and keep the loading low.
I don't have much to lose. My chances of living more than 10 years more
are not good and that assume health good enough to work in the shop.
Dave
On 6/27/22 7:25 AM, Todd Zuercher wrote:
Gluing a spindle taper into a spindle sounds like a truly horribly idea. (I'd
be more worried about it letting go when you didn't want it to, than trying to
get it out later if you did want to remove it, although that also may prove
problematic.)
The drive lugs are usually removable/replaceable. Maybe you could make new
drive lugs that also positively engage the tool holder to retain it. Something
like a longer T shape that would capture the tool holder flange. (Personally
I'd do every thing I could to fix the spindle properly though.)
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
-----Original Message-----
From: dave engvall <[email protected]>
Sent: Monday, June 27, 2022 9:57 AM
To: [email protected]
Subject: Re: [Emc-users] spindle problem
[EXTERNAL EMAIL] Be sure links are safe.
Update: The drive lugs get in the way of a safety disk or ring or anything
else. Epoxy looks more promising; just a semi-permanent solution.
Note: Epoxy can always be removed with heat or chlorinated solvents but...
Dave
On 6/27/22 6:27 AM, dave engvall wrote:
Back again;
Since crawling in under the spindle is difficult for an old stiff guy
I laid the iphone on the table and took a pic, rotated the spindle 45
degrees and took another; nothing useful moved. However, there are
large socket head cap screws around the perimeter of the spindle. It
should be possible to make a safety cap that has a few thou clearance
to limit axial movement. 'Maybe' I can jury rig something. Basically I
have to see what kind of clearances I have. An actual thrust bearing
seems like asking for trouble.
Psychologically it would almost be easier to pick up the radiator cap
and run a new(er) one in. Still that brings all sorts of problems of
its own. Hard to win.
Back to the drawing table. ;-)
Dave
On 6/26/22 9:10 AM, andy pugh wrote:
On Sun, 26 Jun 2022 at 15:45, dave engvall <[email protected]> wrote:
A couple of solutions present themselves but neither are ideal.
Simply use the M6 shcs that hold the dogs in place to secure the CAT40.
Balance and adequate strength/safety would seem to present problems.
Does the nose have any extra holes? There are 4 threaded holes with
no obvious function on my 30INT spindle and looking around the
internet I see threaded holes in some of the CAT40 spindles.
It seems that you could use those to hold in a custom ER40 (or
similar) adaptor.
4000 rpm probably isn't fast enough to need to worry too much about
balance.
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