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Welcome to the forum. This may help.
399467
 

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David - Machinist in wood
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What machine and spindle (or router) do you have? The feeds/speeds I cut with will be different than what you'll cut with.

We do like photos, too! Show us your machine and some of your work, please.
 

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You are right @difalkner .

CNC would be different to normal router use....
 
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David - Machinist in wood
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I am trying to cut signs on poplar and hard maple with straight dual full and spiral up cut bits, can anyone recommend bit and feed speeds.
Are you also using V-bits for your signs? I cut almost everything at 18k rpm with 1/4" upcut/downcut/compression bits at 175ipm in Walnut, Maple, Cherry, etc, and a depth of cut of about 0.300". With 1/8" bits I am fairly conservative cutting at 75ipm to 100ipm. V-bits range from 75ipm to 150ipm.

Your machine isn't as rigid as mine so these feedrates are too high but you can cut them in half and see how that works out. Some folks have bigger and more powerful machines than mine and cut twice as fast as I do, so it just depends on how flexible your machine is to determine good feed rates.
 

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Discussion Starter · #9 ·
It is a Sainsmart 3018Pro with a Geminstu spindle.
Are you also using V-bits for your signs? I cut almost everything at 18k rpm with 1/4" upcut/downcut/compression bits at 175ipm in Walnut, Maple, Cherry, etc, and a depth of cut of about 0.300". With 1/8" bits I am fairly conservative cutting at 75ipm to 100ipm. V-bits range from 75ipm to 150ipm.

Your machine isn't as rigid as mine so these feedrates are too high but you can cut them in half and see how that works out. Some folks have bigger and more powerful machines than mine and cut twice as fast as I do, so it just depends on how flexible your machine is to determine good feed rates.
What would you suggest for 1/8" straight cut on softer woods like poplar.
 

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David - Machinist in wood
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What would you suggest for 1/8" straight cut on softer woods like poplar.
How many flutes on your bit? More than two will be an issue, especially in softer woods. Some Poplar is pretty hard, btw. I would start with 50ipm and see how that does, depth of cut about 0.050", maybe up to 0.075".
 

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On light machines it's usually best to make your cutting depth no more than half the diameter of you bit. If you find your machine flexing then cut the original depth in half and use a faster cutting speed. I usually run 1/8" bits at 75 to 100 ipm depending on the wood.
 

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Good idea as the lower cost units have a tendency to flex and create chatter, which is a rough cut due to the wood deflecting the bit. As I tell clients, let the machine do the work, and who cares if you have to do a few extra passes to get quality cuts.
 
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