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Old 02-18-2017, 05:14 PM
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Default Repairs to a drawbar actuator for a CNC Spindle

First sorry for the lack of pictures, I really was in a hurry for this as it was a
breakdown job. My friend repairs CNC's for a living, he had a customer who
OKK CNC Mill needed a bunch of work to get it running and the down time was
killing them. Replacement parts were 3 month lead time from OKK as this is
an older machine. The large part has a cam follower roller bearing in the back
that is pressed in to the main part, I don't think I have any pictures of the
back or top of it.

The main issue was the adjusting screw threads both on the male and female
sides were destroyed. I had to cut the remaining mess off to remove the
locking nut. There are some pictures of that. The male (smaller) part of the 2
I just made a new one.

The larger female part I cut out the and overbored about .250" on the
diameter and machined a plug with a 0.001" interference fit and pressed it in
with some Loctite 609 bearing retaining compound. Then bored and threaded
to a nice fit. The thread was an M30x1.5, since my lathe is an inch lathe to do
metric threads I have to engage the threading nut and leave it engaged.

As a result of "playing games" with the metric threading I fucked up the first
try on threading. As a result I had to bore out the first plug a little over the
first diameter and replug it. At least I did confirm in the process that the
Loctite cured well the first time...

There was a vent/ air supply hole at the bottom of the female more so my
plugs had to be cut to keep the flow open as there is a set screw on the side
that had to be drilled and tapped through the plug.

All came out well and by last Monday evening the machine was up and
running and making parts. Now just waiting on the check to show up.


1. The main body, female, with the threads bored out.
2. The remade male part.
3 & 4. The new male part with the old part, you can see where I had to cut
the threads to get the locking nut off.
5. First plug for the female side. you can see the cut for the air line.
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Old 02-18-2017, 05:56 PM
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Nice repair! I take it that you threaded into a blind hole One question, don't most machine shops repair their own machines?
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Old 02-18-2017, 07:25 PM
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Quote:
Originally Posted by digr View Post
Nice repair! I take it that you threaded into a blind hole
I cheat, I use a left handed boring bar and thread as the bar pulls out of the
bore and the lathe is running in reverse.

Quote:
Originally Posted by digr View Post
One question, don't most machine shops repair their own machines?
Not much.
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Old 02-18-2017, 07:31 PM
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The rest of the picture, my box of rocks was not behaving and I thought that post was lost. Happy it was not.

6. Plug with a clearance for the air line.
7. Plug pressed in and ready to machine.
8. Drilling
9. Boring
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Old 02-19-2017, 10:37 AM
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I bet it went quicker the second time around. It usually does for me, even though I am being more careful. Something about having a practice run! Lol
Great repair. Thanks for sharing Ron.
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Old 02-19-2017, 02:30 PM
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Quote:
Originally Posted by toprecycler View Post
I bet it went quicker the second time around. It usually does for me, even though I am being more careful. Something about having a practice run!
I think that applies for most people. I just had to "redo" something yesterday--took a lot less time doing the second part.

That looks like a neat repair, Ron. The collective knowledge/skill base of this group is what makes it such a great place...
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Old 02-19-2017, 03:56 PM
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nice repair well executed
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