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Are my Unisaw extension wings attached correctly?

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Forum topic by stevet47 posted 11-09-2017 10:35 PM 1133 views 0 times favorited 9 replies Add to Favorites Watch
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stevet47

20 posts in 1097 days


11-09-2017 10:35 PM

I picked up a used unisaw and have been going through it, cleaning/adjusting everything, and I noticed the cast iron extension wings do not bolt onto the fence rail. I would think they are supposed to be bolted in for added support, but the holes don’t line up.
As far as I know, this is the original fence that came with the saw, but perhaps it was installed incorrectly.

Should I drill the fence rail where the existing holes in the extension table are and add bolts, are the fence rails installed wrong (it doesn’t look like they would like up with any of the other holes either) or is it fine the way it is?


9 replies so far

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MrUnix

6000 posts in 2036 days


#1 posted 11-09-2017 10:48 PM

There are only two ways to attach those table extensions… with the shiny side up, or the shiny side down… so yours looks like you got it right :)

The Biesemeyer fence manual specifically states that the holes are NOT supposed to line up. If you want to attach the fence to the wings, you will need to do some drilling.

Cheers,
Brad

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

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stevet47

20 posts in 1097 days


#2 posted 11-10-2017 03:36 PM

Well ok then. I suppose if Biesemeyer says they aren’t supposed to line up, I won’t worry about it!

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Ripper70

613 posts in 745 days


#3 posted 11-10-2017 04:07 PM



Well ok then. I suppose if Biesemeyer says they aren t supposed to line up, I won t worry about it!

- stevet47

If it were me, I would definitely drill the extra holes. I’d put two in each wing.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

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runswithscissors

2562 posts in 1862 days


#4 posted 11-11-2017 12:04 AM

Cast iron is not difficult to drill and tap.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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jonah

1458 posts in 3135 days


#5 posted 11-11-2017 01:50 AM

You don’t even need to tap it. You can just drill through holes and bolt it on with nuts on the back side.

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runswithscissors

2562 posts in 1862 days


#6 posted 11-11-2017 05:10 AM

What Jonah says is correct. But it depends on where the hole comes out on the other side. Sometimes there will be webbing or some other uneven surface there, in which case tapping is a good way.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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jonah

1458 posts in 3135 days


#7 posted 11-11-2017 12:04 PM

Good point. In any case, you’re right that most any reasonably sharp twist drill bit will go through cast iron quite easily, and tapping isn’t hard either.

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stevet47

20 posts in 1097 days


#8 posted 11-11-2017 03:18 PM

Thanks guys, but I suppose the question is, SHOULD they be bolted, not CAN they be bolted. From MrUnix’s post, it appears the manufacturers did not intend for them to be bolted, is there a reason for this, or should I just go for it?
Are everyone elses saws bolted?

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jonah

1458 posts in 3135 days


#9 posted 11-11-2017 04:59 PM

I bolted my rails to the extension wings. The wings attach to the table with very beefy 5/8” bolts, IIRC, but I figured the more support there the better. IMO, there’s no downside to attaching them to the rails so long as you make sure they’re flush and level with the main table.

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