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Fun with my Tablesaw yesterday

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Blog entry by John posted 01-21-2008 06:51 PM 970 reads 0 times favorited 6 comments Add to Favorites Watch

Hello all. I went out into the shop yesterday to build a miter saw cabinet to get the saw off the floor. I said to myself “Why don’t you check the miter slot to blade parallelism It’s been a while”. It was out by a 1/16! So I get the socket wrench and a dead blow to tap it back in and I don’t have enough adjustment in the trunnion to get it parallel. Lots of head scratching followed by lots of disassembly resulted in the saw top upside down on the base. I cleaned the whole thing and had to grind the trunnions down and enlarge the bolt holes so I would have enough adjustment. I get it back together, flip it over and get it parallel at 90 and it’s out at 45. Some searching on the net told me that the trunnions need to be shimmed away from the top. Specifically the front trunnion needs to be shimmed down. I’m propping the thing up so I have access to the top and bottom and shimming until it works. I’ll get some pictures today so if anyone else has this problem they have some reference before digging in!

Dial indicator with magnetic base attached to my miter gauge. This is the starting point of 90 test.
Blade Parallelism @ 90 Start
End point shows blade out .002. That’s as close as I can get it.
Blade Parallelism @ 90 end point
Same test with the blade at 45.
Blade Parallelism @ 45 Start
End of test shows the blade out of parallel by .014!
Blade Parallelism @ 45 end point
This the rear trunnion.
Rear Trunnion
Front Trunnion is hard to see but I’ll have better pictures today.
Front Trunnion

-- Brain the size of a planet and they have me parking cars.



6 comments so far

View GaryK's profile

GaryK

10262 posts in 2653 days


#1 posted 01-21-2008 06:56 PM

Have you rotated the blade to test different spots on it. It could be out a little also.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View John's profile

John

169 posts in 2459 days


#2 posted 01-22-2008 01:29 AM

Hey Gary,

I marked a spot on the blade on both sides and used that spot for all my measuring. Spent the whole day mucking with it again and its closer but still is not right. I’m going to get dinner and forget about this thing for a while.

-- Brain the size of a planet and they have me parking cars.

View roy's profile

roy

134 posts in 2459 days


#3 posted 01-22-2008 02:35 AM

don’t ever force anything…...just get a bigger hammer!!
have you checked for play in the bearing?

-- tn hillbilly.." tryin to do the best i can with what i got "

View John's profile

John

169 posts in 2459 days


#4 posted 01-22-2008 04:23 AM

Roy,

I checked for bearing run out along the arbor and the face where the blade rests. Grabbed the arbor while I had the saw apart and and no play but it didn’t seem to spin very long when I gave it a whirl. Sounded ok though, no clicking or grinding.

-- Brain the size of a planet and they have me parking cars.

View sandhill's profile

sandhill

2124 posts in 2589 days


#5 posted 02-05-2008 07:15 AM

Silly question John but where are you referencing from? I assume its one of the miter slots. If so did you try the other one? Just a thought but the one that is checked at the factory is determined by if it’s a left tilt or right tilt. If it’s a right tilt they check and set it to the right slot it it’s a left tilt it’s checked from the right slot. I worked for a company doing machine set ups and a tech support guy at Delta told me this so it would make sence if one side stays out of wack.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

View sandhill's profile

sandhill

2124 posts in 2589 days


#6 posted 02-05-2008 07:45 AM

Silly question John but where are you referencing from? I assume its one of the miter slots. If so did you try the other one? Just a thought but the one that is checked at the factory is determined by if it’s a left tilt or right tilt. If it’s a right tilt they check and set it to the left slot, it it’s a left tilt it’s checked from the right slot. I worked for a company doing machine set ups and a tech support guy at Delta told me this so it would make sence if one side stays out of whack. You should never grind a fitted machine part that has come from the factory it will void your warrantee. If it’s a good tool company they ship you a new saw and pick up the defective one or at least have a rep check it out at no cost. It looks fairly new is it a Grizzly? I would use the dial indicator to check the arbor, or you could have a poorly machined trunnion which was a problem with General and a some Jet contractor saws some years back. It was true at 90 degrees and progressively got worse as it went to 45 degrees.

-- Bob Egbert AKA Sandhill http://www.sandhillwoodworks.com/

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