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Forum topic by Brian Talbert posted 03-23-2019 06:28 PM 411 views 0 times favorited 6 replies Add to Favorites Watch
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Brian Talbert

37 posts in 611 days


03-23-2019 06:28 PM

Topic tags/keywords: grizzly support 833p table saw binding trunnion

I’m trying to fix an issue with the mechanism that raises and lowers the blade. It is binding and I can’t figure out what is causing it to bind. It’s been working fine (have had the saw about a year), put on a new blade, lowered it all the way so that I can cut a new zero clearance insert. And it wouldn’t raise. After a bit of back and forth I have been able to get it to raise and inch or so and then it starts getting really hard to turn the knob and binds again. Rinse repeat … lower a bit, raise and bind, etc. At first I suspected something stuck in the worm gear … I have cleaned that and so that doesn’t seem to be the case. The only thing I noticed was may be gear being poorly machined:

Both ends look mishapen … but then it’s the same on both ends, so maybe that is intentional.

I decided I should perhaps take the worm gear off to inspect it. Removed the obvious hex cap screws … and then noticed the set screws.

Not sure what the set screws are actually doing so figured I better stop before making more of a mess of it. Grizzly support is naturally closed.

Below, for reference, is a parts diagram of the trunion. Wormgear is part 192, set screws part 201.

Anyway, any ideas?

-- www.instagram.com/w.brian.talbert/


6 replies so far

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Brian Talbert

37 posts in 611 days


#1 posted 03-26-2019 01:41 AM

I will continue to update here for posterity. As I work through the problem, perhaps it will someday assist someone else.

I called Grizzly today to discuss. First, really very nice and personable, great attitude, very knowledgeable and helpful. Current theory is that the worm screw may in fact be misshapen. Possibly the tooth has started riding up onto the thread and is binding.

They have created what they call an “Activity” which I take as their parlance for what I might call a trouble ticket. I have subsequently sent them the pictures from above for technical review and now I await confirmation of defect or some other next theory.

I am going to continue to wait on next steps before I attempt further disassembly but I have at least noticed that the shaft bracket (part 140) is attached not only from the front (screw 139) but also from the back (also screw 139), straight through the main trunnion. I missed that before so will tackle that if needed … it’s going to be a bear to reach.

-- www.instagram.com/w.brian.talbert/

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lew

12882 posts in 4296 days


#2 posted 03-26-2019 10:59 PM

I have a taiwanese saw that had a similar problem.

Not sure if it will help you but in mine there is a roll pin the captures the shaft for raising and lowering the blade. The pin works loose and jams the mechanism after about one turn.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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Brian Talbert

37 posts in 611 days


#3 posted 07-11-2019 03:21 AM

Finally closing the loop on this one. Grizzly was super helpful and did eventually confirm from the pictures that they also thought that worm screw looked damaged. I ordered a replacement and received it within a week or so … but life got in the way and so I’ve just gotten around to completing the job.

The key to removal was indeed identifying that rear attached screw. Getting to it requires coming in through the door on the right side of the cabinet and removing the dust collector case that surrounds the blade.

Everything back to together and operating correctly. Whew!

Side Note: Before realizing I could go through the side access cover, I thought I was need to take the top off .. and then discovered that two corners of the top appear to be spot welded to the cabinet. Interesting … not sure how you are expected to adjust alignment of blade to miter slots?!?

-- www.instagram.com/w.brian.talbert/

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clagwell

44 posts in 333 days


#4 posted 07-11-2019 10:17 AM

deleted

-- Dave, Tippecanoe County, IN

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ToughCut

72 posts in 2147 days


#5 posted 07-11-2019 12:06 PM

Geeph, the corners are not spot welded the is 2 small set set screws that hold the base to the table top. Set screws need to be remove the align the blade with the mitre slots.

-- If you are not willing to learn, No one can help you. If you are determined to learn, No one can stop you.

View Brian Talbert's profile

Brian Talbert

37 posts in 611 days


#6 posted 07-11-2019 01:19 PM

Ah! That makes much more sense … I will take a closer look. I assume then that if alignment is needed the set screws are removed permanently?


Geeph, the corners are not spot welded the is 2 small set set screws that hold the base to the table top. Set screws need to be remove the align the blade with the mitre slots.

- ToughCut


-- www.instagram.com/w.brian.talbert/

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