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post #1 of 5 (permalink) Old 01-21-2012, 12:04 PM Thread Starter
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Default Uneven stopped grooves

I have a Porter Cable PC 7518 mounted in an Incra Table with an Incra LS Positioner fence. I'm trying to route two stopped 3/4" grooves with a 3/4" core bit in a 2 1/4" x 6 3/4" board stopping 3/8" from each end. I am using stop blocks mounted to the fence.
I route one groove between stops and then flip the board 180 degrees and route the other groove between the two same stops.
The grooves are offset at each end by about 1/8".
There's probably some explanation as to why this is happening but I can't see it nor how to fix it.
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post #2 of 5 (permalink) Old 01-21-2012, 12:20 PM
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Are you sure you groove is in center. Is the same edge against the fence for each cut or is the opposite edge against the fence for the second cut? It seems it might be a hair off & when you flip it around the offset compounds itself.

James
Whittier, CA.

Have a nice & safe day!

Last edited by jlord; 01-21-2012 at 12:24 PM.
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post #3 of 5 (permalink) Old 01-21-2012, 01:12 PM
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Larry, your stop blocks are not centered from the bit. Cut a piece of scrap 3" long and with your router unplugged adjust the bit so the cutting edges are towards the table ends. Place the scrap lightly against the bit and then butt your stop block up against it on each side of the bit. This guarantees you will have the same distance.

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post #4 of 5 (permalink) Old 01-21-2012, 01:28 PM
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What James said. Same issue if you rip a plank using a skillsaw with rip fence, and don't use the same edge, coming in from either end.

(Also touches on the issue previously mentioned about using a saw one handed. Both hands on the saw and use a clamp to hold the wood!)
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post #5 of 5 (permalink) Old 01-21-2012, 02:05 PM Thread Starter
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Quote:
Originally Posted by Mike View Post
Larry, your stop blocks are not centered from the bit. Cut a piece of scrap 3" long and with your router unplugged adjust the bit so the cutting edges are towards the table ends. Place the scrap lightly against the bit and then butt your stop block up against it on each side of the bit. This guarantees you will have the same distance.
Ah Ha. I knew there was something I was missing. Thanks a lot!
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