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  #1  
Old 08-05-2010, 08:12 PM
apoulos apoulos is offline
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Default Johnson Model J Bandsaw rebuild questions

I just purchased an old Johnson Model J Bandsaw with 3/4" blade and 3 phase motor. I have proceeded to tear it apart and clean it. I have a few questions and I'll show some pictures to illustrate:

1. Here is the saw frame after cleaning and beginning of re-assembly.
2. I don't have any other nameplate on the maching and wonder if anyone knows roughly what year this machine was made based on the motor nameplate?
Dake was not helpfull.
3. Drive and idle wheel bearings call for relube yearly.

Would anyone like to comment on the procedure?
In another post, they mention an internal snap ring. Do I pry out the seals first to find the snap ring?
Do I have to worry about damaging the rollers/cup/cone during the procedure?
Where is a good place to find the seals?
-Timken "Seals" or "Dust Caps" x4 total: Timken T50000 90010

4 and 5. Worm and worm gear are worn with groves. Everything attached to the worm shaft (drive pulley, bearings, seal, worm) is worn and I am planning on replacing all except the worm.

Is it feasable to flip the worm and worm gear over to use the unworn side of the gear surfaces?
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  #2  
Old 08-05-2010, 08:30 PM
apoulos apoulos is offline
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Default More pictures and more questions

1. Vise screw has some pitting. Half nut is half worn. Has anyone thought about using enco's $36 mild steel 36"x1"x5 TPI as a replacement?

2. Spur gear is seeing some wear. Is it possible to flip spur gear and ring gear to unused surfaces or will the gear teeth shear off due to fatigue?

3. Here is the geabox shaft seal. Where do I get a seal which measures 20mm ID and 1.625" OD? The manual I downloaded for the "old" saw doesn't even show these parts. Looks like they redesigned the gearbox to use snap rings to retail the bearings. I am planning on getting some metric seals 20mm ID and 42mm OD and boring out the seal holder to 42mm (1.654").

4. Here is the damaged gearbox pulley. Does anyone know of a source for these? Mcmaster's are a little smaller which I figure might help since the highest speed of 190 fpm seems a little slow to me.
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  #3  
Old 08-05-2010, 09:20 PM
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Scotts Scotts is offline
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apoulos,

Welcome, Nice start to a nice saw.

Here is a website for the seal mfg. http://www.klozure.com/ I get this brand from my local bearing house. IBT is their name. If they do not have that brand they offer other brands.

Some others have a saw or 2 similar, do a search if you have not. There may be pictures with the info you need.

Scott
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  #4  
Old 08-05-2010, 11:33 PM
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Flip the gears.
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  #5  
Old 08-06-2010, 12:50 AM
apoulos apoulos is offline
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Default Thanks for the replies

Thanks for the info Scott.

Old Man, I think I will flip the gears and make sure they don't hang up on the worn backside as its slowing down.

Also, what do people use to lubricate the spur and ring gear? The manual says "Open gear lubricant", but that is kinda vague.

I'm planning on ordering bearings, seals and gasket material from mcmaster.com and bearingsdirect.com. Once I have some fresh bearings, I will make a new worm shaft since mine is bent, worn and has its key way rounded over.

I'll keep posting pictures of progress...
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Old 08-06-2010, 01:48 AM
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Apoulos, I didn't dig deep enough into my old beat up Kysor Johnson to be any help to you about those parts. Just didn't feel the need to fix what ain't broke.

However, your question about the correct lubricant does ring some bells.
So I advise you to read this thread - all of it, and carefully.
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  #7  
Old 08-06-2010, 02:51 PM
apoulos apoulos is offline
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Cutter,

Thanks for the link. I will be using Mobil SHC 634 in my gearbox.

What do you use on your ring gear?
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  #8  
Old 08-06-2010, 03:21 PM
apoulos apoulos is offline
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Update: IBT can get the dust caps for $10.84 each + shipping.

I just called IBT (www.ibtinc.com) for the pulley dust caps (Timken T50000 90010) and they said they are sold out. Their system says they are suspended. I'm checking with Timken now...

Does anyone know of any other suppliers that might carry this?

Last edited by apoulos; 08-06-2010 at 04:51 PM. Reason: Update
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  #9  
Old 08-27-2010, 02:51 AM
apoulos apoulos is offline
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Default Progress

I needed to replace one of the wheel bearings. It had a helical score in the cup and on the rollers. Here are the pictures of pressing the cup and cone out. First two are for pressing the cone/felt seal and the second two are of the cup.

I used a fender washer cut into pieces and held in place with a bolt for the cone/felt seal and for the cup. I was able to reuse all the felt seals since they were in good condition. The new felt seal was way too tight for my liking, so I didn't use it.
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  #10  
Old 08-27-2010, 02:56 AM
apoulos apoulos is offline
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Default Wheels

Here are the wheels I added. I have proceeded to clean and paint them, but don't have pictures yet...
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