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4/1000s runout on router?

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Forum topic by JesseTutt posted 661 days ago 757 views 0 times favorited 7 replies Add to Favorites Watch
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JesseTutt

796 posts in 715 days


661 days ago

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

NiteWalker

2709 posts in 1181 days


#1 posted 661 days ago

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

HorizontalMike

6915 posts in 1519 days


#2 posted 661 days ago

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

JesseTutt

796 posts in 715 days


#3 posted 661 days ago

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

Alexandre

1417 posts in 796 days


#4 posted 661 days ago

I think it is accurate enough for me :P

-- My terrible signature...

View GarageWoodworks's profile

GarageWoodworks

419 posts in 761 days


#5 posted 661 days ago

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

-- Subscribe on YouTube: http://www.youtube.com/user/GarageWoodworks?feature=guide

View MonteCristo's profile

MonteCristo

2094 posts in 793 days


#6 posted 661 days ago

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

MNgary

235 posts in 1022 days


#7 posted 661 days ago

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 the world where a duck can cross the road and no one asks why.

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