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Incra LS-III table saw fence system

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Forum topic by Luke posted 02-07-2010 06:37 AM 1129 views 0 times favorited 9 replies Add to Favorites Watch
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Luke

538 posts in 1947 days


02-07-2010 06:37 AM

Topic tags/keywords: incra ls table saw accuracy metal rules

I set up the fence system and zeroed out the fence to the blade. I made some cuts at under 10” and they came out dead on. But when I made a cut at 18” on the metal ruler it wouldn’t center right on the mark like it was doing at the lower numbers. The cut came out way off. So I set it back to under ten inches and made some cuts and they were perfect again. Is it possible the ruler is off? I’ll check it better tomorrow. Maybe I was tired or something. Just wondering if anyone else had this problem or knew why this might happen. Its as if the ruler is only accurate when I’m under 10 inches or so.

Thanks,

-- LAS, http://www.abettersign.com


9 replies so far

View a1Jim's profile

a1Jim

112087 posts in 2231 days


#1 posted 02-07-2010 06:40 AM

sorry I never used an Inca

-- http://artisticwoodstudio.com Custom furniture

View bill merritt's profile

bill merritt

203 posts in 1943 days


#2 posted 02-07-2010 06:48 AM

I use theie jig, can’t say anything about your problem. Only that they are good at supporting the product, any trouble call them—I did.

-- Bill Merritt -Augusta Ga. woodworker

View bigike's profile

bigike

4031 posts in 1942 days


#3 posted 02-07-2010 06:53 AM

please keep us posted? I just bought an ultra and i’m still getting the books and stuff like that for it, but later i’m going to upgrade to the LS positioner and wonder fence so this would be something to watch for when i get mine.

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

View Luke's profile

Luke

538 posts in 1947 days


#4 posted 02-07-2010 08:07 PM

Here are two problems that led to the errors.

One is that my shop is out in a shed without any heat. The incra system has a thin metal ruler that is magnetically placed on the runner to measure out your distances. Because it is so cold outside the ruler has actually shrunk almost 1/32 inches over an 18 inch span and it gets worse if you get up to the 36 inch mark on the saw! Crazy to think it huh. I know this because I always keep a measure in my pocket and that one was I’m guessing warm. When I put it up to the Incra it was off! I thought maybe I should try another tape so I used one that was out there… cold, and that one was dead on. I know that the teeth on the incra lock it into position on 32’nds so this still didn’t explain completely my problem with cutting things right on. Well, this is where it gets interesting. The table saw blade was heeling about 13 thousands towards the fence at the back. I tried to adjust it with the trunion bolts to no avail. I took one of the bolts out and noticed that there was plenty of room for it to move but it just wouldn’t go! I looked a little closer and realized that the lock washers ( star shaped) had made an impression on the trunion that must have been keeping it from moving. I had checked this once before and gotten it dialed in right but after running the saw it must have “vibrated” back into the impression somehow. I grabbed some flat washers and put that underneath the lock washers and was able to dial it right back into zero heeling. Awesome. Hopefully it stays that way. Now I have to re-zero the incra and try a couple of cuts. I will have to compensate for the crazy shrinking ruler manually which is a pain but at least now I know. I had thought about removing the ruler and bringing it inside to acclimate when I’m not out there or something. I have a small heater out there but I can’t keep it on all the time. I’ll have to figure out something.

-- LAS, http://www.abettersign.com

View blackcherry's profile

blackcherry

3161 posts in 2477 days


#5 posted 02-07-2010 10:17 PM

Check the distance in multiple areas between the front and back rails and see if there any discrepancy. If so the fence may shift causing the error. Just worth trying…Blkcherry

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blackcherry

3161 posts in 2477 days


#6 posted 02-07-2010 10:26 PM

Skywalker01 here the most knowledgeable Incra man on the planet..Mark Mueller of Incra , he the field manger and will answer any question via email. mark@incra.com Monday / Fridays only. If all else fails I know Mark has the answer…also he been with Woodpecker and Incra over 20 years..good luck Blkcherry

View Luke's profile

Luke

538 posts in 1947 days


#7 posted 02-08-2010 05:04 AM

Yeah I thought the fence might be moving too but I know that the ruler used on the system is shrinking in the cold weather. I have no other way to explain it. I tried to tighten down the fence on the front rail and check it and same result. I’ve checked everything. But,... I will email him because I could be missing something major. :) Thanks blackcherry!

-- LAS, http://www.abettersign.com

View RockyTopScott's profile

RockyTopScott

1140 posts in 2132 days


#8 posted 02-08-2010 08:50 PM

I have talked and emailed Mark on numerous occasions and concur that HE IS THE MAN when it comes to this subject. A great guy.

-- “When you want to help people, you tell them the truth. When you want to help yourself, you tell them what they want to hear.” ― Thomas Sowell

View Luke's profile

Luke

538 posts in 1947 days


#9 posted 02-09-2010 01:50 AM

Yes I have emailed him and he says that the ruler shouldn’t shrink more than a couple thousands of an inch in the kind of weather that it’s experiencing. It’s more likely that the rulers I’m using to compare are actually off. I’ve since checked this and I believe he’s correct. He did say that the best way to set up the ruler might be to set it at the halfway mark as dead on so that it has less distance to be off. Great idea. Thanks,

-- LAS, http://www.abettersign.com

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