4/1000s runout on router?

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Forum topic by JesseTutt posted 10-08-2012 03:31 PM 1627 views 0 times favorited 7 replies Add to Favorites Watch
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854 posts in 2077 days

10-08-2012 03:31 PM

Topic tags/keywords: question router runout alignment

I am doing the fall tool alignment. Table saw was perfect, drill press had no runout, jointer was within 1/1000, then I got to the two router tables.

The first router table has runout of about 4/1000s. I used my dial indicator in a miter gauge slot and a 6” stainless steel rod. The rod was advertised as a perfectly straight rod for alignment purposes. As I turn the router collet manually I notice the indicator fluctuate with a change of about 4/1000s. Is this acceptable?

The second router table has runout of around 12/1000s. This table is different because I have a router bit extentor between the router and the rod. With the router mounted in the original Rout-R-Lift the collet can’t get close enough to the top of the table to allow most bits to work. I think I got the extendor from CMT or maybe MLCS. Using the same procedure as the previous router I get 12/1000 runout. Is this acceptable?

Here is a couple of pictures from table #1:

Both routers are Triton 3 1/4 HP. The one in table 1 is newer and has the above the table adjustment built in. Router 2 is older and does not have the adjustment, hence the need for the router lift.

-- Jesse, Saint Louis, Missouri

7 replies so far

View NiteWalker's profile


2736 posts in 2544 days

#1 posted 10-08-2012 04:23 PM

The spec might seem high since you’re measuring pretty far from the collet.
The other one is most certainly caused by the extender.

-- He who dies with the most tools... dies with the emptiest wallet.

View HorizontalMike's profile


7749 posts in 2881 days

#2 posted 10-08-2012 04:46 PM

All I can say is when my Harley crankshaft was 0.006” out, I had to rebuild the motor. That said, have you checked the collets as the possible culprit? The router with 0.012” runout may be a combination of issues to get THAT much runout.

-- HorizontalMike -- "Woodpeckers understand..."

View JesseTutt's profile


854 posts in 2077 days

#3 posted 10-08-2012 11:26 PM

Today I tried measuring the runout close to the table top and got the same amount of runout. I know that it is not the alignment pin because in the drill press it showed no runout.

-- Jesse, Saint Louis, Missouri

View Alexandre's profile


1417 posts in 2158 days

#4 posted 10-08-2012 11:30 PM

I think it is accurate enough for me :P

-- My terrible signature...

View GarageWoodworks's profile


531 posts in 2123 days

#5 posted 10-08-2012 11:37 PM

When you start using router bits that are as long as the distance at which you took your measurements, then maybe.

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View MonteCristo's profile


2099 posts in 2155 days

#6 posted 10-09-2012 02:52 AM

4 thou seems a bit high but probably not that unusual. 12 thou definitely seems high.

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

View MNgary's profile


298 posts in 2384 days

#7 posted 10-09-2012 03:25 AM

Put a straight-edged bit in the router and edge a 3’ board. Can you feel ripples when you run your finger along the edge?

Hand rub a shellac finish on the edged board (sanding between costs) and use a bright light to inspect it. Does it look acceptable?

-- I dream of a world where a duck can cross the road and no one asks why.

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