I am pretty sure is a bit issue but I have started to have these wood curls. Could you please confirm it is due to a not so sharp bit?
Can happen when you cut with the grain, then it rather curls. It depends on the wood you are using, maple loves doing it, other wood doesn’t. It happens mostly with shallower cuts.
Yes I am going with the grain. I see this both with ash and poplar. I will try to decrease the cutting depth.
is your tool new or old?
relatively new maybe did 20 jobs on ash, poplar and MDF
what flute? and speed? There are others that this may help.
I am curious if you are using a 2 or 3 flute or a single flute commonly called O flute I believe.
I think the single flute may correct this. I have not used ash but I use pine. Sometimes happens. Never that bad though.
single flute, 6 mm, 34k rpm, 1500 mm/min
Nah, rather increase it. 
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34k rpm…. Way too much
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I am using the makita router set at 6/6 what would you advise?
That’s 24k. 
I did 3-6mm DOC with a 6mm single flute, 24k RPM, 1800mm/min with my LR, depending on wood.
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I usually do 4-6mm DOC with a 1/4" endmill at 15K RPM’s and 2400mm/min Turning that bit way faster than you need to
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Is there an easy way to figure out the RPMs? The routers just have a numbered dial…how do you know what RPMs correspond to each setting? (I’m using the Carbide ER11 router which is a clone of the Makita I think).
Edit: nevermind…I found this chart for the Makita RT0700
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Thanks all. Next time I will try with 3/6 which based on the table should be 17k rpm. I will also increase slightly the horizontal speed maybe to 2k mm/min
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Please let us know the results.
I will as soon as I have some glued cores to cut
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So I just tried with 3/6 on the nob and 2k mm/min. The curling has clearly decreased. I will tr the next ones with the same settings and a fresh bit to see if it improves even more.
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It may sound harsh but you have to do tests for your feeds&speeds and find out what works for you: materials, machine, route, anyone is going to give you a range that works only for him.
My case: i follow the amana bits charts. Changed all my bits to Amana( not cheap) but 1 single bit have more than 200 acm sheets and still using it with clean cuts. (+300 is the actual count)
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You are doing some incredible stuff… Wow.
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