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Align drive install on PM949

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Kamloopsendo

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#1
I'm stuck installing an Align drive on the Z axis of my PM949. I don't know how to remove this Black object from the shaft and don't want to risk damaging anything while I experiment. I've already loosened the white ring that covers the bearing but the Black shaft does not want to come free.

Z axis shaft.jpg

Hopefully one have you will have already figured this out and be able to help me out. Thanks in advance for the help.
Alex
 

davidpbest

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#2
Yes, I have been right where you are, scratching my head how to remove the black collar to install the Align power feeder on the Z-axis on my PM935. Here's what I can tell you.

That black collar is threaded onto the shaft that rotates - circled in green here:
IMG_2667.jpg

I wasn't sure if the bushing was pressed on, if there was a cross-pin securing it, or if it was threaded, so I decided to remove the entire assembly and deal with it on the bench. The end of that shaft that turns has a ball bearing assembly that is slip-fit into a mating hole in the knee casting. You can see photos of that here:

IMG_2669.jpg

The end of the shaft has a pinion gear (keyed to the shaft and secured with a screw into the end of the shaft) which is smaller in diameter than the hole in the casting for the bearing:

IMG_2668 (1).jpg

I put a slide hammer onto the end of the shaft, and with a few sharp blows pulling the shaft outward from the knee, the bearing slipped out of the hole in the casting and I took the entire assembly to the bench to figure things out. What I discovered is that the black bushing is threaded and locked in place onto the shaft with something like Lock-tite. I put the shaft in a vise and went after that bushing with Channel-locks and couldn't get enough of a grip on it to budge it loose. So I put a torch on the bushing and heated it up slightly and then applied a monkey wrench to the bushing as shown here, and it came loose (it is normal right-hand threaded):

IMG_2694.jpg

I have to say that whoever put that bushing onto the shaft at the factory wanted to make sure it never came loose - it's on there goodentite and locked with some kind of seizing material. But I did get it off and didn't damage anything. Reinstalling the shaft was as simple as lightly tapping on the end of the shaft to re-seat the bearing into the hole in the casting near the knee elevation screw.

You might be able to get that bushing loose from the shaft if you figure a way to lock the shaft from turning and then using a toothed wrench on the bushing. But if I had to do this over again, I would still pull the entire assembly and take it to the bench and use a vise to grip the shaft.

If you'd like to see all that I went through to install the Align feeders on each of the three (X, Y, Z) axis, it's all documented with photos and videos, and each photo has a detailed description if you click on the photo: https://flic.kr/s/aHsmoK65ZQ

Hope this helps.
 

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[X]Outlaw

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#3
Hey Alex,

No need to remove the entire assembly, at least I didn't have to. Slide on the castle nut and make sure it engages the key in the shaft, use the knee handle on that nut to hold it in place. Then use a monkey wrench on the collar. It takes a bit of force but it comes of.

I to was stumped on how to remove that part when I did my install. The method above is how Matt advised me to do it and it worked like a charm.

Chevy
 

Kamloopsendo

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#4
Got the same advise Chevy (from Matt) and Thanks David for responding so quick, I may have to use David's approach as in trying to slide the Castle Nut back on I dislodged the key and pushed it back. Gonna try to put it back in place and try the simple approach, if not David's approach will work, I just don't like using a slide hammer to remove a bearing I plan to reuse although in this case the number of turns that bearing will get make that concern largely academic I suppose. I'll let you guys know how it works out and Thanks to both of you.
 

Kamloopsendo

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#5
Worked great Chevy, put the key back in the Keyway and used the clutch to twist the shaft and vice grips to hold the outside of the offending black piece. An David, thanks again, I very nearly had to go that route which does sound simple enough once you know what's going on in there.
 
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