This was weird...routing a taper...? - Router Forums
 
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post #1 of 7 (permalink) Old 01-29-2015, 12:28 PM Thread Starter
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Default This was weird...routing a taper...?

Last night I was profiling some edging for a small shelf for pool table accessories.

Shelf is 15 X 5 1/2...using 3/4 Red Oak for shelf and edging. Cut 1 1/2" strips for the edging and proceeded to router the face with a section of a chair molding bit, 1/2" shank.

Slapped some doublesided to a piece of 2x4 and laid that baby on the table and commenced sawdust production...

...and when I finished putting the profile on the three sides...SURPRISE...they were tapered from one end to the other by 1/8" (they started out as 3/4").

Immediately I took my metal straightedge and lined up across the two fences...dead even alignment...

Then double-checked the bearing-to-fence and it was inboard by 1/16", which is where I started.

Triton was locked, bit was tight, there was no chatter, fences were tight and the whole fence was tight to the table... (RA1181-Bosch-bilt for Craftsman)...I even grabbed the fence and pulled on it and it moved the table...

There was no way to fix on the router table so I sliced off the back of the edging on my bandsaw to make it square again. I could use the waste as shims...SHEEZZ...

..."did I do that?"...

Thanks in advance...Nick

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Last edited by Nickp; 01-29-2015 at 12:34 PM.
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post #2 of 7 (permalink) Old 01-29-2015, 04:03 PM
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Nick; Silly question probably, but are you 100% positive the taper wasn't there before you started the profile?
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post #3 of 7 (permalink) Old 01-29-2015, 05:21 PM Thread Starter
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Nick; Silly question probably, but are you 100% positive the taper wasn't there before you started the profile?
Yes...all the pieces were cut from the same leftover stair riser...I did check the remaining cutoff pieces and all 3/4...it would seem impossible...never happened to me before. I went to my fences thinking it may have been misaligned like in edge joining but both were aligned. Sawdust was cleaned before each cut...the split in the fences was about 1/4" wider than the bit on each side. Speed was about 20,000...bit is about 1" at its widest... To make the full profile I moved the fence back about 1/8 for each pass. The three edges were cut first then profiled...probably should have routered it in one piece then miter cut...don't see how that would matter. I did use a featherboard above the piece over the bit for all but first pass...


I'm gonna cut some more when I get home to see if I can duplicate...left everything as was...

I'm starting to think I might not have applied even pressure across the pass...

Thanks for thinking of the obvious...got a feeling it's gonna be something silly...

Nick

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Last edited by Nickp; 01-29-2015 at 05:23 PM.
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post #4 of 7 (permalink) Old 01-30-2015, 07:35 AM Thread Starter
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Default Mystery solved...

I had left the setup as it was the night before. I cot some 1x2 to the same lengths as my original pieces and started cutting. The first pass is reasonably good. Each successive pass makes it worse. It was acting like my out feed was offset.
I put the straight edge on the fence and it was dead on at the top but offset at the bottom. Fence was slightly twisted.

I took the out feed fence off and found the culprit...slight amount of sawdust from a previous edge cleaning operation just before the profile cutting.

I had slipped the spacer in to edge the boards and when I took it out I didn't take the out feed fence off to clean behind it.

DUH...!!!

This will NOT happen again..."haste makes waste"

Thank you for not putting me through the grinder

Is this a good reason to have another table...?

Nick

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post #5 of 7 (permalink) Old 01-30-2015, 08:03 AM
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Sleeping on it resolves many of my Klutz moments. I usually stop working on a project at night after committing a Klutz moments Glad you found the shim. Shame you weren't videoing it so we could share the expression on your face

Learning is an exciting adventure
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post #6 of 7 (permalink) Old 01-30-2015, 08:38 AM Thread Starter
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Sleeping on it resolves many of my Klutz moments. I usually stop working on a project at night after committing a Klutz moments Glad you found the shim. Shame you weren't videoing it so we could share the expression on your face
Audio would have been better...! It was like an out of body experience...I couldn't believe the things I said to me...

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post #7 of 7 (permalink) Old 01-30-2015, 11:17 AM
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Good thing you figured it out. And, you have an important lesson for woodworkers everywhere - keep it clean.

I have always had problems with sawdust and chips. I'm constantly cleaning/blowing off the work area but still get misalignment due to that. All the accurate measurements and set up in to world mean nothing when a little dust gets in the wrong spot.
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