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Powermatic Lathe 45 Motor mount issue

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Forum topic by CurtMatt posted 04-05-2018 09:09 PM 240 views 0 times favorited 5 replies Add to Favorites Watch
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CurtMatt

2 posts in 1616 days


04-05-2018 09:09 PM

Topic tags/keywords: powermatic model 45 45 motor mount refurbish lathe motor question advice

I am finally getting around to evaluating a Model 45 (4 pulley) lathe I bought and disassembled to get out of the sellers basement. It ran OK in his basement- the journey up the stairs required me to take it apart. I have now put it back together which required me to remount the 3/4 HP Dayton motor. When it runs there is a fair amount of vibration which disappears when I lift the motor up just a bit. The motor ran smoothly before installation. The motor position seems a bit canted to the pulleys, might not be aligned as well. My problem is that there seems little ability to change the way the motor is aligned to reduce the vibration. I also doubt this is the original motor as the electrical connector box on it hits the switch box on the stand when pulled forward.

When I took the motor mount apart the hinge rod for the brackets were replaced by 2 separate short bolts. I replaced those with a 3/8” x 8” bolt that spans the distance. I noted that the motor mounts were worn so I ordered something that looks close from MAcMaster Carr, will update once they are received/installed.

The arm for the belt tensioner hangs down and is 2”+ from the side of the motor mount- I doubt that is where it originally was positioned (it is straight, not bent).

Given that the vibration virtually disappears when I lift up on the motor I believe the top bearings are fine for now. I would adjust the motor mount rods (they move freely- placed in top position and secured with adjusting set screw) but can that take the cant out?

Any help or insight would be appreciated.

-- Curt, Fairfax, VA


5 replies so far

View MrUnix's profile

MrUnix

6766 posts in 2224 days


#1 posted 04-05-2018 09:30 PM

Can’t help with the 4-step specific stuff as my PM45 has the reeves drive, but there should be plenty of play where the supporting rods attach to the motor mount plate… at least on mine there is – the holes are oblong allowing for lateral movement, and the ‘tilt’ can be adjusted by adjusting the supporting nuts on the bottom. Maybe post a picture or three so we can see what you got.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View CurtMatt's profile

CurtMatt

2 posts in 1616 days


#2 posted 04-07-2018 10:14 PM

Brad, thanks for the information. After taking a break I went back and removed the motor (much easier than installing) and reseated the pulley closer to the motor housing. When I installed the motor the 4-step collars were aligned- this time the lathe ran smoothly, a big difference. I think it also helped that I connected the belt tensioner. Naturally, as soon as I had installed the motor my order for rubber bushings arrived in the mail- so I will get the opportunity to take it out one more time.
The holes for my motor mounts do not appear to be oblong. The motor mount has a flat spot that requires only one orientation for the set screw to engage. They move up and down.

Is there a secret to installing the motor? I ended up using a small hydraulic jack with a wood fabricated bracket to hold it up while trying to get the front mount bolt installed- what a pain!

-- Curt, Fairfax, VA

View darthford's profile

darthford

608 posts in 1950 days


#3 posted 04-07-2018 10:22 PM

If you are on a quest for reduced vibration consider a link belt. I ran some tests on a gunsmith metal lathe, factory CHINA V belt, high quality NAPA ribbed V belt, and the link belt. The link belt won by a mile eliminating vibration in the machine casting and chuck.

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MrUnix

6766 posts in 2224 days


#4 posted 04-07-2018 10:27 PM

If you are on a quest for reduced vibration consider a link belt. I ran some tests on a gunsmith metal lathe, factory CHINA V belt, high quality NAPA ribbed V belt, and the link belt. The link belt won by a mile eliminating vibration in the machine casting and chuck.
- darthford

Well, I have a link-belt on my 45 (was there when I bought it) and it sucks – soon to be replaced with a real belt as soon as I can find the time to do it. They are good for machines that self-tension via motor weight, or where changing the belt would involve a lot of disassembly – but not really all that good for fixed mounts. Plus they stretch, which is a royal PITA in a lot of situations.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View Macbass's profile

Macbass

1 post in 1030 days


#5 posted 06-14-2018 12:05 PM

I have a Powermatic 45 and need a bango any ideas as to what will fit that I can purchase.

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