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Trim Router Roundover Bit Burning

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Forum topic by Ynot posted 11-04-2021 08:18 PM 691 views 0 times favorited 21 replies Add to Favorites Watch
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Ynot

50 posts in 2928 days


11-04-2021 08:18 PM

Since I have a descent stock of cheap pine I sometimes use it for prototypes, especially when a projects unfamiliar. This helps cut down on my chances of ruining the expensive stuff when I finally get to it. And now with the cost of lumber…

My latest project is matching cutting boards as gifts this year. I’m also incorporating a handle on each end. After using a router and template to cut the shape I’m then softening the edge with a roundover. For this I’m using an older PC 3101 trim router rated at 27,500. The roundover which was only used once before is rated at the same speed.

I routed clockwise at a normal rate and got some burning (see pic below). Is this because of the cheap, soft pine or other reason? I ask because I hope to avoid the same with the final cutting boards being done in walnut and maple.

Again, this is only a prototype to bring me through the process. I’d never make a cutting board from pine.


21 replies so far

View JAAune's profile

JAAune

2094 posts in 3660 days


#1 posted 11-04-2021 08:42 PM

The bit is dull, dirty or you’re feeding too slow. Do the roundover in three passes with the final pass removing about 1/32” of material at a fast feed rate. If it still burns, clean the bit. If it still burns, replace the bit.

-- See my work at http://altaredesign.com

View John Smith's profile

John Smith

3033 posts in 1506 days


#2 posted 11-04-2021 08:53 PM

as JAAune said.
cherry wood is even more susceptible to burning than that pine !!
on the bright side – it will easily sand out with some sandpaper.

-- I am a painter: that's what I do, I like to paint things. --

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CaptainKlutz

5170 posts in 2837 days


#3 posted 11-04-2021 08:57 PM

+1 dull, dirty, or too fast.

+1 Suggest two-three passes.
Use round over 1/16” smaller than final size to remove most of material.
Follow by fast pass with next larger size.
Useful on woods prone to burning, or small tight shapes that are hard to route around quickly.

Best Luck!

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

View CWWoodworking's profile

CWWoodworking

2311 posts in 1522 days


#4 posted 11-04-2021 09:38 PM

That’s too fast. Invest in one of the new variable speed trim routers. I love my 3 dewalt cordless. Heard good things about makita and Milwaukee.

I had trouble with a 1/4” round over burning. Switched to new router and it went away completely with same bit.

View splintergroup's profile

splintergroup

6391 posts in 2565 days


#5 posted 11-04-2021 10:56 PM

Every handhold hole that I’ve done like yours has had some amount of burning. One of the common issues with routed end grain.
To clean it up, I use strips of 1-1/2” 120 and 240 Al oxide and work it like shining a shoe. Thread it through and have at it.

Not the most fun, but the quickest and best at keeping the contours “pure” that I’ve found.

This is usually done on a router table with a Milwaukee motor and Whiteside bit.

View EarlS's profile

EarlS

5038 posts in 3691 days


#6 posted 11-04-2021 11:08 PM

Try turning the speed down a bit if you have a variable speed router.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View Ynot's profile

Ynot

50 posts in 2928 days


#7 posted 11-04-2021 11:24 PM

Thanks all. If I could do it in multiple passes I’d try that, but it’s kind of awkward being able to see to judge that. This is one of those you’d have to be there to see what I mean situations.

Either way, I just got home and gave it another try, but I moved around a bit faster. Nice and clean this time.

I’ll have to practice a new speed on scrap walnut and maple before the actual cutting boards.

View LeeRoyMan's profile

LeeRoyMan

2404 posts in 1070 days


#8 posted 11-04-2021 11:39 PM



Thanks all. If I could do it in multiple passes I’d try that, but it’s kind of awkward being able to see to judge that. This is one of those you’d have to be there to see what I mean situations.

- Ynot


Yeah, I don’t get that.
You just set the depth of your router less for the first pass, then lower it just a little for the next pass.
I’m not getting the, you’d have to be there to get it part.

PS: Is that a 3102 PC? If so, do you want to sell it?

View Ynot's profile

Ynot

50 posts in 2928 days


#9 posted 11-05-2021 12:16 AM


Yeah, I don t get that.
You just set the depth of your router less for the first pass, then lower it just a little for the next pass.
I m not getting the, you d have to be there to get it part.

PS: Is that a 3102 PC? If so, do you want to sell it?

- LeeRoyMan

Have you ever had one of those days when someone tells you something and you think you understood, but you really didn’t? THIS is one of those days. And yes, I feel like a dope now. Either way next time I’ll hit it with multiple passes.

As far as the router, yes it’s a 3102 that came with a 3101 base. I’ve had it for a long time, so long that the bearings are sounding a bit dry and time for a rebuild. The only two things I’ve never liked about it is the adjustment ring doesn’t stay in place and the height adjustment knob is way too small for my pickle fingers, so it’s a bear to tighten. Otherwise a nice little machine that I wouldn’t part with.

View LeeRoyMan's profile

LeeRoyMan

2404 posts in 1070 days


#10 posted 11-05-2021 12:23 AM


PS: Is that a 3102 PC? If so, do you want to sell it?

- LeeRoyMan

As far as the router, yes it’s a 3102 that came with a 3101 base. I’ve had it for a long time, so long that the bearings are sounding a bit dry and time for a rebuild. The only two things I’ve never liked about it is the adjustment ring doesn’t stay in place and the height adjustment knob is way too small for my pickle fingers, so it’s a bear to tighten. Otherwise a nice little machine that I wouldn’t part with.

- Ynot


Sounds like junk,
I would still give you 75 dollars for it though. :)
(and I would pay for shipping)

View Rich's profile (online now)

Rich

7760 posts in 1932 days


#11 posted 11-05-2021 12:33 AM


Sounds like junk,
I would still give you 75 dollars for it though. :)

I’ll give you $76!

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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LeeRoyMan

2404 posts in 1070 days


#12 posted 11-05-2021 01:04 AM


Sounds like junk,
I would still give you 75 dollars for it though. :)

I ll give you $76!

- Rich


I’ve got 2 of them now, but am looking for them whenever I can.
They’re great trim routers, probably why they quit making them.
Wouldn’t want to make something good that people like. (sarcasm)

View Richard's profile

Richard

1959 posts in 4033 days


#13 posted 11-05-2021 02:42 AM


Sounds like junk,
I would still give you 75 dollars for it though. :)

I ll give you $76!

- Rich

I ve got 2 of them now, but am looking for them whenever I can.
They re great trim routers, probably why they quit making them.
Wouldn t want to make something good that people like. (sarcasm)

- LeeRoyMan


Thats the problem , they take the good stuff and replace it with Junk for more $$$.

View Lazyman's profile

Lazyman

8880 posts in 2730 days


#14 posted 11-05-2021 03:48 AM

They probably stopped making them because they last too long.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View LeeRoyMan's profile

LeeRoyMan

2404 posts in 1070 days


#15 posted 11-05-2021 03:57 AM

I’ve had it for a long time, so long that the bearings are sounding a bit dry and time for a rebuild.

- Ynot

I think I have a new top bearing for it if you need it.
Let me know, Ill double check.
They’re easy to change.

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