What am I doing wrong, flush trim routing - Router Forums
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post #1 of 14 (permalink) Old 03-22-2015, 04:31 PM Thread Starter
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Default What am I doing wrong, flush trim routing

I got two sheets of plywood glued together, with 3/4 thickx 1.5" oak around it.
I have a Diablo flush trim bit, bearing on bottom.

Started out 10rpm,really wavy, 13 better. These are the speeds I used when ding edge over, or atleast the dial was left there. Do the RPMs need to be faster? Do I need to move faster?

I am glad I did this on the bottom. It is just a reloading bench so not a big deal. I use projects like these to practice stuff.

But for the most part I am happy with my edge stuff. So not sure what I am doing wrong. Most of edge stuff is on table, not free hand.

Thanks.
Ridgid combo router, using fixed base.

Last edited by Zerk; 03-22-2015 at 06:06 PM.
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post #2 of 14 (permalink) Old 03-22-2015, 04:38 PM
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Are you flushing the top edge with the plywood?
What is the diameter of the flush trim bit and it's shank?
The wider bits i.e. 1/2"-5/8" with a 1/2 shank will give you better results. Also, you might up the rpms a bit. Maybe to 15K.

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post #3 of 14 (permalink) Old 03-22-2015, 05:06 PM
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Wavy could be two things.

First, the router is wobbling side to side on that skinny edge, and diggin deeper and shallower in spots.

Second, you could be feeding the wrong direction. If you are climb cutting, the router can be pulling itself forward and skipping down the edge of the wood. There is a good picture of this on the first link below

Climb Cutting/Chip Cutting
Router Jig; Flush-trim stabilizers

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post #4 of 14 (permalink) Old 03-22-2015, 06:04 PM Thread Starter
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I tired going both directions, but one way it ran off on me. I thought you don't want it to pull you. I was cutting the oak banding, using the plywood as the guide.

With an edge over but you can do a little more and a little more. With a flush trim bit it seems to be all over nothing.


This is the bit I have DR42110. Only one they had at Home Depot. I really wanted something 1.5" deep.
Diablo 1/2 in. x 1 in. Carbide Flush Trimming Router Bit-DR42110 - The Home Depot
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post #5 of 14 (permalink) Old 03-22-2015, 07:18 PM
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Quote:
Originally Posted by Zerk View Post
I tired going both directions, but one way it ran off on me. I thought you don't want it to pull you. I was cutting the oak banding, using the plywood as the guide.

With an edge over but you can do a little more and a little more. With a flush trim bit it seems to be all over nothing.


This is the bit I have DR42110. Only one they had at Home Depot. I really wanted something 1.5" deep.
Diablo 1/2 in. x 1 in. Carbide Flush Trimming Router Bit-DR42110 - The Home Depot
when it runs away on you that's the results of you climbing cutting...
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post #6 of 14 (permalink) Old 03-22-2015, 07:41 PM
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Zerk, I believe what you are doing is wobbling the router while balancing it on the edge.
If you clamp a wider block of wood to the opposite side you are trimming it will give you more are for the router base to set on, making it much easier to control.

Have a blessed evening, and fun making dust, Todd
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post #7 of 14 (permalink) Old 03-22-2015, 07:47 PM Thread Starter
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Quote:
Originally Posted by todd628 View Post
Zerk, I believe what you are doing is wobbling the router while balancing it on the edge.
If you clamp a wider block of wood to the opposite side you are trimming it will give you more are for the router base to set on, making it much easier to control.

Have a blessed evening, and fun making dust, Todd
I was having issues with that, holding the router horizontal, instead of up and down. The piece is 30x60", and only 1.5" thick.

I'll try that next time.
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post #8 of 14 (permalink) Old 03-22-2015, 08:28 PM
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How much oak is hanging past the edge of the plywood? If it is more than about 1/4 of the diameter of the router bit, you're likely to have problems with chipping and splintering. Also, can you stand the plywood vertically on edge and let the router base rest on the edge? I think you'll have better luck holding it straight that way.

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post #9 of 14 (permalink) Old 03-22-2015, 08:54 PM
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Originally Posted by DonkeyHody View Post
How much oak is hanging past the edge of the plywood? If it is more than about 1/4 of the diameter of the router bit, you're likely to have problems with chipping and splintering. Also, can you stand the plywood vertically on edge and let the router base rest on the edge? I think you'll have better luck holding it straight that way.
go vertical, clamp on say a 4x4 to the side not being trimmed and flush to the OS edge...
if the edging hasn't been trimmed yet on the side the rest will be clamped to rebate the rest to accommodate the edge....
you now have an expanded router rest...
a single 2x4 may even work...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”

Last edited by Stick486; 03-22-2015 at 09:01 PM.
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post #10 of 14 (permalink) Old 03-22-2015, 09:48 PM
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Quote:
Originally Posted by Stick486 View Post
go vertical, clamp on say a 4x4 to the side not being trimmed and flush to the OS edge...
if the edging hasn't been trimmed yet on the side the rest will be clamped to rebate the rest to accommodate the edge....
you now have an expanded router rest...
a single 2x4 may even work...
Check the second link in my post above for another easy solution

Doug
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