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Unisaw Worm Gear Disassembly Fury and Torment

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Forum topic by bigjim21 posted 03-22-2016 01:56 AM 381 views 0 times favorited 7 replies Add to Favorites Watch
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bigjim21

5 posts in 271 days


03-22-2016 01:56 AM

Topic tags/keywords: unisaw rebuild worm gear gear worms 34-802

I am rebuilding a 34-802 Unisaw from 1988 and I have the entire saw apart and in pieces, but I can’t get the worm gears off the tilt and blade-lifting shafts to save my life. I’ve pulled the roll pins, the stop collars are sliding freely, but I absolutely cannot figure out what sort of dark magic is involved in getting those worm gears to slide free.

Having had a very long and storied history with banging on things until they break, I have opted not to do that this time.

Does anybody know the magic trick?? I will love you longtime.


7 replies so far

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MrUnix

4247 posts in 1667 days


#1 posted 03-22-2016 01:59 AM

Clean the shaft spotless, make sure the roll pins are completely removed, and they will come off. They are a precision fit and the slightest little burr or accumulated rust/gunk will hang them up.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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bigjim21

5 posts in 271 days


#2 posted 03-22-2016 02:02 AM

ok but how do I make them come off. bang on it? from what direction? with what? how? how hard? the one that tilts the blade is mounted all the way at the end of a shaft so its almost impossible to get anything on it. the other end of that shaft has bullets in it that lock the shaft – so it wont come out from that direction.
do you use a bearing puller on it or something from the far end?

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Holbs

1381 posts in 1497 days


#3 posted 03-22-2016 02:07 AM

whack with a rubber mallet first, penetrating oil overnight second. The worm gear is only held by 1? 2? roll pins, nothing else. If it is still stuck, something else is amiss.

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

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Holbs

1381 posts in 1497 days


#4 posted 03-22-2016 02:12 AM

I had to do the same as you Jim, rather recently. Rebuild of my Unisaw. Looking at the parts diagram this Monday, the tilting worm gear has 2 roll pins while the raise/lower worm gear has plugs. I can’t remember :)

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

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Holbs

1381 posts in 1497 days


#5 posted 03-22-2016 02:18 AM

Unsure if this helps, but here are a couple pics of my rebuild with views of the worm gears:

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

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bigjim21

5 posts in 271 days


#6 posted 03-22-2016 02:36 AM

looks really nice. did you polish the rod or is that paint? new gears?

mine only have one roll pin apiece that i can find. it came out fairly easily.

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MrUnix

4247 posts in 1667 days


#7 posted 03-22-2016 02:41 AM

Only one roll pin per gear. Be thankful you don’t have tapered pins instead :)

Cheers,
Brad

PS: If you haven’t already read them, there are a couple of good disassembly/assembly articles over at the VintageMachinery site (here and here).

-- Brad in FL - To be old and wise, you must first be young and stupid

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